/**
* @license
* Copyright The Closure Library Authors.
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @fileoverview Utilities for manipulating the browser's Document Object Model
* Inspiration taken *heavily* from mochikit (http://mochikit.com/).
*
* You can use {@link goog.dom.DomHelper} to create new dom helpers that refer
* to a different document object. This is useful if you are working with
* frames or multiple windows.
*
* @suppress {strictMissingProperties}
*/
// TODO(arv): Rename/refactor getTextContent and getRawTextContent. The problem
// is that getTextContent should mimic the DOM3 textContent. We should add a
// getInnerText (or getText) which tries to return the visible text, innerText.
goog.provide('goog.dom');
goog.provide('goog.dom.Appendable');
goog.provide('goog.dom.DomHelper');
goog.require('goog.array');
goog.require('goog.asserts');
goog.require('goog.dom.BrowserFeature');
goog.require('goog.dom.NodeType');
goog.require('goog.dom.TagName');
goog.require('goog.dom.safe');
goog.require('goog.html.SafeHtml');
goog.require('goog.html.uncheckedconversions');
goog.require('goog.math.Coordinate');
goog.require('goog.math.Size');
goog.require('goog.object');
goog.require('goog.string');
goog.require('goog.string.Const');
goog.require('goog.string.Unicode');
goog.require('goog.userAgent');
/**
* @define {boolean} Whether we know at compile time that the browser is in
* quirks mode.
*/
goog.dom.ASSUME_QUIRKS_MODE = goog.define('goog.dom.ASSUME_QUIRKS_MODE', false);
/**
* @define {boolean} Whether we know at compile time that the browser is in
* standards compliance mode.
*/
goog.dom.ASSUME_STANDARDS_MODE =
goog.define('goog.dom.ASSUME_STANDARDS_MODE', false);
/**
* Whether we know the compatibility mode at compile time.
* @type {boolean}
* @private
*/
goog.dom.COMPAT_MODE_KNOWN_ =
goog.dom.ASSUME_QUIRKS_MODE || goog.dom.ASSUME_STANDARDS_MODE;
/**
* Gets the DomHelper object for the document where the element resides.
* @param {(Node|Window)=} opt_element If present, gets the DomHelper for this
* element.
* @return {!goog.dom.DomHelper} The DomHelper.
*/
goog.dom.getDomHelper = function(opt_element) {
'use strict';
return opt_element ?
new goog.dom.DomHelper(goog.dom.getOwnerDocument(opt_element)) :
(goog.dom.defaultDomHelper_ ||
(goog.dom.defaultDomHelper_ = new goog.dom.DomHelper()));
};
/**
* Cached default DOM helper.
* @type {!goog.dom.DomHelper|undefined}
* @private
*/
goog.dom.defaultDomHelper_;
/**
* Gets the document object being used by the dom library.
* @return {!Document} Document object.
*/
goog.dom.getDocument = function() {
'use strict';
return document;
};
/**
* Gets an element from the current document by element id.
*
* If an Element is passed in, it is returned.
*
* @param {string|Element} element Element ID or a DOM node.
* @return {Element} The element with the given ID, or the node passed in.
*/
goog.dom.getElement = function(element) {
'use strict';
return goog.dom.getElementHelper_(document, element);
};
/**
* Gets an element by id from the given document (if present).
* If an element is given, it is returned.
* @param {!Document} doc
* @param {string|Element} element Element ID or a DOM node.
* @return {Element} The resulting element.
* @private
*/
goog.dom.getElementHelper_ = function(doc, element) {
'use strict';
return typeof element === 'string' ? doc.getElementById(element) : element;
};
/**
* Gets an element by id, asserting that the element is found.
*
* This is used when an element is expected to exist, and should fail with
* an assertion error if it does not (if assertions are enabled).
*
* @param {string} id Element ID.
* @return {!Element} The element with the given ID, if it exists.
*/
goog.dom.getRequiredElement = function(id) {
'use strict';
return goog.dom.getRequiredElementHelper_(document, id);
};
/**
* Helper function for getRequiredElementHelper functions, both static and
* on DomHelper. Asserts the element with the given id exists.
* @param {!Document} doc
* @param {string} id
* @return {!Element} The element with the given ID, if it exists.
* @private
*/
goog.dom.getRequiredElementHelper_ = function(doc, id) {
'use strict';
// To prevent users passing in Elements as is permitted in getElement().
goog.asserts.assertString(id);
var element = goog.dom.getElementHelper_(doc, id);
element =
goog.asserts.assertElement(element, 'No element found with id: ' + id);
return element;
};
/**
* Alias for getElement.
* @param {string|Element} element Element ID or a DOM node.
* @return {Element} The element with the given ID, or the node passed in.
* @deprecated Use {@link goog.dom.getElement} instead.
*/
goog.dom.$ = goog.dom.getElement;
/**
* Gets elements by tag name.
* @param {!goog.dom.TagName<T>} tagName
* @param {(!Document|!Element)=} opt_parent Parent element or document where to
* look for elements. Defaults to document.
* @return {!NodeList<R>} List of elements. The members of the list are
* {!Element} if tagName is not a member of goog.dom.TagName or more
* specific types if it is (e.g. {!HTMLAnchorElement} for
* goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.getElementsByTagName = function(tagName, opt_parent) {
'use strict';
var parent = opt_parent || document;
return parent.getElementsByTagName(String(tagName));
};
/**
* Looks up elements by both tag and class name, using browser native functions
* (`querySelectorAll`, `getElementsByTagName` or
* `getElementsByClassName`) where possible. This function
* is a useful, if limited, way of collecting a list of DOM elements
* with certain characteristics. `querySelectorAll` offers a
* more powerful and general solution which allows matching on CSS3
* selector expressions.
*
* Note that tag names are case sensitive in the SVG namespace, and this
* function converts opt_tag to uppercase for comparisons. For queries in the
* SVG namespace you should use querySelector or querySelectorAll instead.
* https://bugzilla.mozilla.org/show_bug.cgi?id=963870
* https://bugs.webkit.org/show_bug.cgi?id=83438
*
* @see {https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelectorAll}
*
* @param {(string|?goog.dom.TagName<T>)=} opt_tag Element tag name.
* @param {?string=} opt_class Optional class name.
* @param {(Document|Element)=} opt_el Optional element to look in.
* @return {!IArrayLike<R>} Array-like list of elements (only a length property
* and numerical indices are guaranteed to exist). The members of the array
* are {!Element} if opt_tag is not a member of goog.dom.TagName or more
* specific types if it is (e.g. {!HTMLAnchorElement} for
* goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.getElementsByTagNameAndClass = function(opt_tag, opt_class, opt_el) {
'use strict';
return goog.dom.getElementsByTagNameAndClass_(
document, opt_tag, opt_class, opt_el);
};
/**
* Gets the first element matching the tag and the class.
*
* @param {(string|?goog.dom.TagName<T>)=} opt_tag Element tag name.
* @param {?string=} opt_class Optional class name.
* @param {(Document|Element)=} opt_el Optional element to look in.
* @return {?R} Reference to a DOM node. The return type is {?Element} if
* tagName is a string or a more specific type if it is a member of
* goog.dom.TagName (e.g. {?HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.getElementByTagNameAndClass = function(opt_tag, opt_class, opt_el) {
'use strict';
return goog.dom.getElementByTagNameAndClass_(
document, opt_tag, opt_class, opt_el);
};
/**
* Returns a static, array-like list of the elements with the provided
* className.
*
* @param {string} className the name of the class to look for.
* @param {(Document|Element)=} opt_el Optional element to look in.
* @return {!IArrayLike<!Element>} The items found with the class name provided.
*/
goog.dom.getElementsByClass = function(className, opt_el) {
'use strict';
var parent = opt_el || document;
if (goog.dom.canUseQuerySelector_(parent)) {
return parent.querySelectorAll('.' + className);
}
return goog.dom.getElementsByTagNameAndClass_(
document, '*', className, opt_el);
};
/**
* Returns the first element with the provided className.
*
* @param {string} className the name of the class to look for.
* @param {Element|Document=} opt_el Optional element to look in.
* @return {Element} The first item with the class name provided.
*/
goog.dom.getElementByClass = function(className, opt_el) {
'use strict';
var parent = opt_el || document;
var retVal = null;
if (parent.getElementsByClassName) {
retVal = parent.getElementsByClassName(className)[0];
} else {
retVal =
goog.dom.getElementByTagNameAndClass_(document, '*', className, opt_el);
}
return retVal || null;
};
/**
* Ensures an element with the given className exists, and then returns the
* first element with the provided className.
*
* @param {string} className the name of the class to look for.
* @param {!Element|!Document=} opt_root Optional element or document to look
* in.
* @return {!Element} The first item with the class name provided.
* @throws {goog.asserts.AssertionError} Thrown if no element is found.
*/
goog.dom.getRequiredElementByClass = function(className, opt_root) {
'use strict';
var retValue = goog.dom.getElementByClass(className, opt_root);
return goog.asserts.assert(
retValue, 'No element found with className: ' + className);
};
/**
* Prefer the standardized (http://www.w3.org/TR/selectors-api/), native and
* fast W3C Selectors API.
* @param {!(Element|Document)} parent The parent document object.
* @return {boolean} whether or not we can use parent.querySelector* APIs.
* @private
*/
goog.dom.canUseQuerySelector_ = function(parent) {
'use strict';
return !!(parent.querySelectorAll && parent.querySelector);
};
/**
* Helper for `getElementsByTagNameAndClass`.
* @param {!Document} doc The document to get the elements in.
* @param {(string|?goog.dom.TagName<T>)=} opt_tag Element tag name.
* @param {?string=} opt_class Optional class name.
* @param {(Document|Element)=} opt_el Optional element to look in.
* @return {!IArrayLike<R>} Array-like list of elements (only a length property
* and numerical indices are guaranteed to exist). The members of the array
* are {!Element} if opt_tag is not a member of goog.dom.TagName or more
* specific types if it is (e.g. {!HTMLAnchorElement} for
* goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
* @private
*/
goog.dom.getElementsByTagNameAndClass_ = function(
doc, opt_tag, opt_class, opt_el) {
'use strict';
var parent = opt_el || doc;
var tagName =
(opt_tag && opt_tag != '*') ? String(opt_tag).toUpperCase() : '';
if (goog.dom.canUseQuerySelector_(parent) && (tagName || opt_class)) {
var query = tagName + (opt_class ? '.' + opt_class : '');
return parent.querySelectorAll(query);
}
// Use the native getElementsByClassName if available, under the assumption
// that even when the tag name is specified, there will be fewer elements to
// filter through when going by class than by tag name
if (opt_class && parent.getElementsByClassName) {
var els = parent.getElementsByClassName(opt_class);
if (tagName) {
var arrayLike = {};
var len = 0;
// Filter for specific tags if requested.
for (var i = 0, el; el = els[i]; i++) {
if (tagName == el.nodeName) {
arrayLike[len++] = el;
}
}
arrayLike.length = len;
return /** @type {!IArrayLike<!Element>} */ (arrayLike);
} else {
return els;
}
}
var els = parent.getElementsByTagName(tagName || '*');
if (opt_class) {
var arrayLike = {};
var len = 0;
for (var i = 0, el; el = els[i]; i++) {
var className = el.className;
// Check if className has a split function since SVG className does not.
if (typeof className.split == 'function' &&
goog.array.contains(className.split(/\s+/), opt_class)) {
arrayLike[len++] = el;
}
}
arrayLike.length = len;
return /** @type {!IArrayLike<!Element>} */ (arrayLike);
} else {
return els;
}
};
/**
* Helper for goog.dom.getElementByTagNameAndClass.
*
* @param {!Document} doc The document to get the elements in.
* @param {(string|?goog.dom.TagName<T>)=} opt_tag Element tag name.
* @param {?string=} opt_class Optional class name.
* @param {(Document|Element)=} opt_el Optional element to look in.
* @return {?R} Reference to a DOM node. The return type is {?Element} if
* tagName is a string or a more specific type if it is a member of
* goog.dom.TagName (e.g. {?HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
* @private
*/
goog.dom.getElementByTagNameAndClass_ = function(
doc, opt_tag, opt_class, opt_el) {
'use strict';
var parent = opt_el || doc;
var tag = (opt_tag && opt_tag != '*') ? String(opt_tag).toUpperCase() : '';
if (goog.dom.canUseQuerySelector_(parent) && (tag || opt_class)) {
return parent.querySelector(tag + (opt_class ? '.' + opt_class : ''));
}
var elements =
goog.dom.getElementsByTagNameAndClass_(doc, opt_tag, opt_class, opt_el);
return elements[0] || null;
};
/**
* Alias for `getElementsByTagNameAndClass`.
* @param {(string|?goog.dom.TagName<T>)=} opt_tag Element tag name.
* @param {?string=} opt_class Optional class name.
* @param {Element=} opt_el Optional element to look in.
* @return {!IArrayLike<R>} Array-like list of elements (only a length property
* and numerical indices are guaranteed to exist). The members of the array
* are {!Element} if opt_tag is not a member of goog.dom.TagName or more
* specific types if it is (e.g. {!HTMLAnchorElement} for
* goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
* @deprecated Use {@link goog.dom.getElementsByTagNameAndClass} instead.
*/
goog.dom.$$ = goog.dom.getElementsByTagNameAndClass;
/**
* Sets multiple properties, and sometimes attributes, on an element. Note that
* properties are simply object properties on the element instance, while
* attributes are visible in the DOM. Many properties map to attributes with the
* same names, some with different names, and there are also unmappable cases.
*
* This method sets properties by default (which means that custom attributes
* are not supported). These are the exeptions (some of which is legacy):
* - "style": Even though this is an attribute name, it is translated to a
* property, "style.cssText". Note that this property sanitizes and formats
* its value, unlike the attribute.
* - "class": This is an attribute name, it is translated to the "className"
* property.
* - "for": This is an attribute name, it is translated to the "htmlFor"
* property.
* - Entries in {@see goog.dom.DIRECT_ATTRIBUTE_MAP_} are set as attributes,
* this is probably due to browser quirks.
* - "aria-*", "data-*": Always set as attributes, they have no property
* counterparts.
*
* @param {Element} element DOM node to set properties on.
* @param {Object} properties Hash of property:value pairs.
* Property values can be strings or goog.string.TypedString values (such as
* goog.html.SafeUrl).
*/
goog.dom.setProperties = function(element, properties) {
'use strict';
goog.object.forEach(properties, function(val, key) {
'use strict';
if (val && typeof val == 'object' && val.implementsGoogStringTypedString) {
val = val.getTypedStringValue();
}
if (key == 'style') {
element.style.cssText = val;
} else if (key == 'class') {
element.className = val;
} else if (key == 'for') {
element.htmlFor = val;
} else if (goog.dom.DIRECT_ATTRIBUTE_MAP_.hasOwnProperty(key)) {
element.setAttribute(goog.dom.DIRECT_ATTRIBUTE_MAP_[key], val);
} else if (
goog.string.startsWith(key, 'aria-') ||
goog.string.startsWith(key, 'data-')) {
element.setAttribute(key, val);
} else {
element[key] = val;
}
});
};
/**
* Map of attributes that should be set using
* element.setAttribute(key, val) instead of element[key] = val. Used
* by goog.dom.setProperties.
*
* @private {!Object<string, string>}
* @const
*/
goog.dom.DIRECT_ATTRIBUTE_MAP_ = {
'cellpadding': 'cellPadding',
'cellspacing': 'cellSpacing',
'colspan': 'colSpan',
'frameborder': 'frameBorder',
'height': 'height',
'maxlength': 'maxLength',
'nonce': 'nonce',
'role': 'role',
'rowspan': 'rowSpan',
'type': 'type',
'usemap': 'useMap',
'valign': 'vAlign',
'width': 'width'
};
/**
* Gets the dimensions of the viewport.
*
* Gecko Standards mode:
* docEl.clientWidth Width of viewport excluding scrollbar.
* win.innerWidth Width of viewport including scrollbar.
* body.clientWidth Width of body element.
*
* docEl.clientHeight Height of viewport excluding scrollbar.
* win.innerHeight Height of viewport including scrollbar.
* body.clientHeight Height of document.
*
* Gecko Backwards compatible mode:
* docEl.clientWidth Width of viewport excluding scrollbar.
* win.innerWidth Width of viewport including scrollbar.
* body.clientWidth Width of viewport excluding scrollbar.
*
* docEl.clientHeight Height of document.
* win.innerHeight Height of viewport including scrollbar.
* body.clientHeight Height of viewport excluding scrollbar.
*
* IE6/7 Standards mode:
* docEl.clientWidth Width of viewport excluding scrollbar.
* win.innerWidth Undefined.
* body.clientWidth Width of body element.
*
* docEl.clientHeight Height of viewport excluding scrollbar.
* win.innerHeight Undefined.
* body.clientHeight Height of document element.
*
* IE5 + IE6/7 Backwards compatible mode:
* docEl.clientWidth 0.
* win.innerWidth Undefined.
* body.clientWidth Width of viewport excluding scrollbar.
*
* docEl.clientHeight 0.
* win.innerHeight Undefined.
* body.clientHeight Height of viewport excluding scrollbar.
*
* Opera 9 Standards and backwards compatible mode:
* docEl.clientWidth Width of viewport excluding scrollbar.
* win.innerWidth Width of viewport including scrollbar.
* body.clientWidth Width of viewport excluding scrollbar.
*
* docEl.clientHeight Height of document.
* win.innerHeight Height of viewport including scrollbar.
* body.clientHeight Height of viewport excluding scrollbar.
*
* WebKit:
* Safari 2
* docEl.clientHeight Same as scrollHeight.
* docEl.clientWidth Same as innerWidth.
* win.innerWidth Width of viewport excluding scrollbar.
* win.innerHeight Height of the viewport including scrollbar.
* frame.innerHeight Height of the viewport exluding scrollbar.
*
* Safari 3 (tested in 522)
*
* docEl.clientWidth Width of viewport excluding scrollbar.
* docEl.clientHeight Height of viewport excluding scrollbar in strict mode.
* body.clientHeight Height of viewport excluding scrollbar in quirks mode.
*
* @param {Window=} opt_window Optional window element to test.
* @return {!goog.math.Size} Object with values 'width' and 'height'.
*/
goog.dom.getViewportSize = function(opt_window) {
'use strict';
// TODO(arv): This should not take an argument
return goog.dom.getViewportSize_(opt_window || window);
};
/**
* Helper for `getViewportSize`.
* @param {Window} win The window to get the view port size for.
* @return {!goog.math.Size} Object with values 'width' and 'height'.
* @private
*/
goog.dom.getViewportSize_ = function(win) {
'use strict';
var doc = win.document;
var el = goog.dom.isCss1CompatMode_(doc) ? doc.documentElement : doc.body;
return new goog.math.Size(el.clientWidth, el.clientHeight);
};
/**
* Calculates the height of the document.
*
* @return {number} The height of the current document.
*/
goog.dom.getDocumentHeight = function() {
'use strict';
return goog.dom.getDocumentHeight_(window);
};
/**
* Calculates the height of the document of the given window.
*
* @param {!Window} win The window whose document height to retrieve.
* @return {number} The height of the document of the given window.
*/
goog.dom.getDocumentHeightForWindow = function(win) {
'use strict';
return goog.dom.getDocumentHeight_(win);
};
/**
* Calculates the height of the document of the given window.
*
* Function code copied from the opensocial gadget api:
* gadgets.window.adjustHeight(opt_height)
*
* @private
* @param {!Window} win The window whose document height to retrieve.
* @return {number} The height of the document of the given window.
*/
goog.dom.getDocumentHeight_ = function(win) {
'use strict';
// NOTE(eae): This method will return the window size rather than the document
// size in webkit quirks mode.
var doc = win.document;
var height = 0;
if (doc) {
// Calculating inner content height is hard and different between
// browsers rendering in Strict vs. Quirks mode. We use a combination of
// three properties within document.body and document.documentElement:
// - scrollHeight
// - offsetHeight
// - clientHeight
// These values differ significantly between browsers and rendering modes.
// But there are patterns. It just takes a lot of time and persistence
// to figure out.
var body = doc.body;
var docEl = /** @type {!HTMLElement} */ (doc.documentElement);
if (!(docEl && body)) {
return 0;
}
// Get the height of the viewport
var vh = goog.dom.getViewportSize_(win).height;
if (goog.dom.isCss1CompatMode_(doc) && docEl.scrollHeight) {
// In Strict mode:
// The inner content height is contained in either:
// document.documentElement.scrollHeight
// document.documentElement.offsetHeight
// Based on studying the values output by different browsers,
// use the value that's NOT equal to the viewport height found above.
height =
docEl.scrollHeight != vh ? docEl.scrollHeight : docEl.offsetHeight;
} else {
// In Quirks mode:
// documentElement.clientHeight is equal to documentElement.offsetHeight
// except in IE. In most browsers, document.documentElement can be used
// to calculate the inner content height.
// However, in other browsers (e.g. IE), document.body must be used
// instead. How do we know which one to use?
// If document.documentElement.clientHeight does NOT equal
// document.documentElement.offsetHeight, then use document.body.
var sh = docEl.scrollHeight;
var oh = docEl.offsetHeight;
if (docEl.clientHeight != oh) {
sh = body.scrollHeight;
oh = body.offsetHeight;
}
// Detect whether the inner content height is bigger or smaller
// than the bounding box (viewport). If bigger, take the larger
// value. If smaller, take the smaller value.
if (sh > vh) {
// Content is larger
height = sh > oh ? sh : oh;
} else {
// Content is smaller
height = sh < oh ? sh : oh;
}
}
}
return height;
};
/**
* Gets the page scroll distance as a coordinate object.
*
* @param {Window=} opt_window Optional window element to test.
* @return {!goog.math.Coordinate} Object with values 'x' and 'y'.
* @deprecated Use {@link goog.dom.getDocumentScroll} instead.
*/
goog.dom.getPageScroll = function(opt_window) {
'use strict';
var win = opt_window || goog.global || window;
return goog.dom.getDomHelper(win.document).getDocumentScroll();
};
/**
* Gets the document scroll distance as a coordinate object.
*
* @return {!goog.math.Coordinate} Object with values 'x' and 'y'.
*/
goog.dom.getDocumentScroll = function() {
'use strict';
return goog.dom.getDocumentScroll_(document);
};
/**
* Helper for `getDocumentScroll`.
*
* @param {!Document} doc The document to get the scroll for.
* @return {!goog.math.Coordinate} Object with values 'x' and 'y'.
* @private
*/
goog.dom.getDocumentScroll_ = function(doc) {
'use strict';
var el = goog.dom.getDocumentScrollElement_(doc);
var win = goog.dom.getWindow_(doc);
if (goog.userAgent.IE && goog.userAgent.isVersionOrHigher('10') &&
win.pageYOffset != el.scrollTop) {
// The keyboard on IE10 touch devices shifts the page using the pageYOffset
// without modifying scrollTop. For this case, we want the body scroll
// offsets.
return new goog.math.Coordinate(el.scrollLeft, el.scrollTop);
}
return new goog.math.Coordinate(
win.pageXOffset || el.scrollLeft, win.pageYOffset || el.scrollTop);
};
/**
* Gets the document scroll element.
* @return {!Element} Scrolling element.
*/
goog.dom.getDocumentScrollElement = function() {
'use strict';
return goog.dom.getDocumentScrollElement_(document);
};
/**
* Helper for `getDocumentScrollElement`.
* @param {!Document} doc The document to get the scroll element for.
* @return {!Element} Scrolling element.
* @private
*/
goog.dom.getDocumentScrollElement_ = function(doc) {
'use strict';
// Old WebKit needs body.scrollLeft in both quirks mode and strict mode. We
// also default to the documentElement if the document does not have a body
// (e.g. a SVG document).
// Uses http://dev.w3.org/csswg/cssom-view/#dom-document-scrollingelement to
// avoid trying to guess about browser behavior from the UA string.
if (doc.scrollingElement) {
return doc.scrollingElement;
}
if (!goog.userAgent.WEBKIT && goog.dom.isCss1CompatMode_(doc)) {
return doc.documentElement;
}
return doc.body || doc.documentElement;
};
/**
* Gets the window object associated with the given document.
*
* @param {Document=} opt_doc Document object to get window for.
* @return {!Window} The window associated with the given document.
*/
goog.dom.getWindow = function(opt_doc) {
'use strict';
// TODO(arv): This should not take an argument.
return opt_doc ? goog.dom.getWindow_(opt_doc) : window;
};
/**
* Helper for `getWindow`.
*
* @param {!Document} doc Document object to get window for.
* @return {!Window} The window associated with the given document.
* @private
*/
goog.dom.getWindow_ = function(doc) {
'use strict';
return /** @type {!Window} */ (doc.parentWindow || doc.defaultView);
};
/**
* Returns a dom node with a set of attributes. This function accepts varargs
* for subsequent nodes to be added. Subsequent nodes will be added to the
* first node as childNodes.
*
* So:
* <code>createDom(goog.dom.TagName.DIV, null, createDom(goog.dom.TagName.P),
* createDom(goog.dom.TagName.P));</code> would return a div with two child
* paragraphs
*
* This function uses {@link goog.dom.setProperties} to set attributes: the
* `opt_attributes` parameter follows the same rules.
*
* @param {string|!goog.dom.TagName<T>} tagName Tag to create.
* @param {?Object|?Array<string>|string=} opt_attributes If object, then a map
* of name-value pairs for attributes. If a string, then this is the
* className of the new element. If an array, the elements will be joined
* together as the className of the new element.
* @param {...(Object|string|Array|NodeList|null|undefined)} var_args Further
* DOM nodes or strings for text nodes. If one of the var_args is an array
* or NodeList, its elements will be added as childNodes instead.
* @return {R} Reference to a DOM node. The return type is {!Element} if tagName
* is a string or a more specific type if it is a member of
* goog.dom.TagName (e.g. {!HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.createDom = function(tagName, opt_attributes, var_args) {
'use strict';
return goog.dom.createDom_(document, arguments);
};
/**
* Helper for `createDom`.
* @param {!Document} doc The document to create the DOM in.
* @param {!Arguments} args Argument object passed from the callers. See
* `goog.dom.createDom` for details.
* @return {!Element} Reference to a DOM node.
* @private
*/
goog.dom.createDom_ = function(doc, args) {
'use strict';
var tagName = String(args[0]);
var attributes = args[1];
var element = goog.dom.createElement_(doc, tagName);
if (attributes) {
if (typeof attributes === 'string') {
element.className = attributes;
} else if (Array.isArray(attributes)) {
element.className = attributes.join(' ');
} else {
goog.dom.setProperties(element, attributes);
}
}
if (args.length > 2) {
goog.dom.append_(doc, element, args, 2);
}
return element;
};
/**
* Appends a node with text or other nodes.
* @param {!Document} doc The document to create new nodes in.
* @param {!Node} parent The node to append nodes to.
* @param {!Arguments} args The values to add. See `goog.dom.append`.
* @param {number} startIndex The index of the array to start from.
* @private
*/
goog.dom.append_ = function(doc, parent, args, startIndex) {
'use strict';
function childHandler(child) {
// TODO(user): More coercion, ala MochiKit?
if (child) {
parent.appendChild(
typeof child === 'string' ? doc.createTextNode(child) : child);
}
}
for (var i = startIndex; i < args.length; i++) {
var arg = args[i];
// TODO(attila): Fix isArrayLike to return false for a text node.
if (goog.isArrayLike(arg) && !goog.dom.isNodeLike(arg)) {
// If the argument is a node list, not a real array, use a clone,
// because forEach can't be used to mutate a NodeList.
goog.array.forEach(
goog.dom.isNodeList(arg) ? goog.array.toArray(arg) : arg,
childHandler);
} else {
childHandler(arg);
}
}
};
/**
* Alias for `createDom`.
* @param {string|!goog.dom.TagName<T>} tagName Tag to create.
* @param {?Object|?Array<string>|string=} opt_attributes If object, then a map
* of name-value pairs for attributes. If a string, then this is the
* className of the new element. If an array, the elements will be joined
* together as the className of the new element.
* @param {...(Object|string|Array|NodeList|null|undefined)} var_args Further
* DOM nodes or strings for text nodes. If one of the var_args is an array,
* its children will be added as childNodes instead.
* @return {R} Reference to a DOM node. The return type is {!Element} if tagName
* is a string or a more specific type if it is a member of
* goog.dom.TagName (e.g. {!HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
* @deprecated Use {@link goog.dom.createDom} instead.
*/
goog.dom.$dom = goog.dom.createDom;
/**
* Creates a new element.
* @param {string|!goog.dom.TagName<T>} name Tag to create.
* @return {R} The new element. The return type is {!Element} if name is
* a string or a more specific type if it is a member of goog.dom.TagName
* (e.g. {!HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.createElement = function(name) {
'use strict';
return goog.dom.createElement_(document, name);
};
/**
* Creates a new element.
* @param {!Document} doc The document to create the element in.
* @param {string|!goog.dom.TagName<T>} name Tag to create.
* @return {R} The new element. The return type is {!Element} if name is
* a string or a more specific type if it is a member of goog.dom.TagName
* (e.g. {!HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
* @private
*/
goog.dom.createElement_ = function(doc, name) {
'use strict';
name = String(name);
if (doc.contentType === 'application/xhtml+xml') name = name.toLowerCase();
return doc.createElement(name);
};
/**
* Creates a new text node.
* @param {number|string} content Content.
* @return {!Text} The new text node.
*/
goog.dom.createTextNode = function(content) {
'use strict';
return document.createTextNode(String(content));
};
/**
* Create a table.
* @param {number} rows The number of rows in the table. Must be >= 1.
* @param {number} columns The number of columns in the table. Must be >= 1.
* @param {boolean=} opt_fillWithNbsp If true, fills table entries with
* `goog.string.Unicode.NBSP` characters.
* @return {!Element} The created table.
*/
goog.dom.createTable = function(rows, columns, opt_fillWithNbsp) {
'use strict';
// TODO(mlourenco): Return HTMLTableElement, also in prototype function.
// Callers need to be updated to e.g. not assign numbers to table.cellSpacing.
return goog.dom.createTable_(document, rows, columns, !!opt_fillWithNbsp);
};
/**
* Create a table.
* @param {!Document} doc Document object to use to create the table.
* @param {number} rows The number of rows in the table. Must be >= 1.
* @param {number} columns The number of columns in the table. Must be >= 1.
* @param {boolean} fillWithNbsp If true, fills table entries with
* `goog.string.Unicode.NBSP` characters.
* @return {!HTMLTableElement} The created table.
* @private
*/
goog.dom.createTable_ = function(doc, rows, columns, fillWithNbsp) {
'use strict';
var table = goog.dom.createElement_(doc, goog.dom.TagName.TABLE);
var tbody =
table.appendChild(goog.dom.createElement_(doc, goog.dom.TagName.TBODY));
for (var i = 0; i < rows; i++) {
var tr = goog.dom.createElement_(doc, goog.dom.TagName.TR);
for (var j = 0; j < columns; j++) {
var td = goog.dom.createElement_(doc, goog.dom.TagName.TD);
// IE <= 9 will create a text node if we set text content to the empty
// string, so we avoid doing it unless necessary. This ensures that the
// same DOM tree is returned on all browsers.
if (fillWithNbsp) {
goog.dom.setTextContent(td, goog.string.Unicode.NBSP);
}
tr.appendChild(td);
}
tbody.appendChild(tr);
}
return table;
};
/**
* Creates a new Node from constant strings of HTML markup.
* @param {...!goog.string.Const} var_args The HTML strings to concatenate then
* convert into a node.
* @return {!Node}
*/
goog.dom.constHtmlToNode = function(var_args) {
'use strict';
var stringArray =
Array.prototype.map.call(arguments, goog.string.Const.unwrap);
var safeHtml =
goog.html.uncheckedconversions
.safeHtmlFromStringKnownToSatisfyTypeContract(
goog.string.Const.from(
'Constant HTML string, that gets turned into a ' +
'Node later, so it will be automatically balanced.'),
stringArray.join(''));
return goog.dom.safeHtmlToNode(safeHtml);
};
/**
* Converts HTML markup into a node. This is a safe version of
* `goog.dom.htmlToDocumentFragment` which is now deleted.
* @param {!goog.html.SafeHtml} html The HTML markup to convert.
* @return {!Node} The resulting node.
*/
goog.dom.safeHtmlToNode = function(html) {
'use strict';
return goog.dom.safeHtmlToNode_(document, html);
};
/**
* Helper for `safeHtmlToNode`.
* @param {!Document} doc The document.
* @param {!goog.html.SafeHtml} html The HTML markup to convert.
* @return {!Node} The resulting node.
* @private
*/
goog.dom.safeHtmlToNode_ = function(doc, html) {
'use strict';
var tempDiv = goog.dom.createElement_(doc, goog.dom.TagName.DIV);
if (goog.dom.BrowserFeature.INNER_HTML_NEEDS_SCOPED_ELEMENT) {
goog.dom.safe.setInnerHtml(
tempDiv, goog.html.SafeHtml.concat(goog.html.SafeHtml.BR, html));
tempDiv.removeChild(goog.asserts.assert(tempDiv.firstChild));
} else {
goog.dom.safe.setInnerHtml(tempDiv, html);
}
return goog.dom.childrenToNode_(doc, tempDiv);
};
/**
* Helper for `safeHtmlToNode_`.
* @param {!Document} doc The document.
* @param {!Node} tempDiv The input node.
* @return {!Node} The resulting node.
* @private
*/
goog.dom.childrenToNode_ = function(doc, tempDiv) {
'use strict';
if (tempDiv.childNodes.length == 1) {
return tempDiv.removeChild(goog.asserts.assert(tempDiv.firstChild));
} else {
var fragment = doc.createDocumentFragment();
while (tempDiv.firstChild) {
fragment.appendChild(tempDiv.firstChild);
}
return fragment;
}
};
/**
* Returns true if the browser is in "CSS1-compatible" (standards-compliant)
* mode, false otherwise.
* @return {boolean} True if in CSS1-compatible mode.
*/
goog.dom.isCss1CompatMode = function() {
'use strict';
return goog.dom.isCss1CompatMode_(document);
};
/**
* Returns true if the browser is in "CSS1-compatible" (standards-compliant)
* mode, false otherwise.
* @param {!Document} doc The document to check.
* @return {boolean} True if in CSS1-compatible mode.
* @private
*/
goog.dom.isCss1CompatMode_ = function(doc) {
'use strict';
if (goog.dom.COMPAT_MODE_KNOWN_) {
return goog.dom.ASSUME_STANDARDS_MODE;
}
return doc.compatMode == 'CSS1Compat';
};
/**
* Determines if the given node can contain children, intended to be used for
* HTML generation.
*
* IE natively supports node.canHaveChildren but has inconsistent behavior.
* Prior to IE8 the base tag allows children and in IE9 all nodes return true
* for canHaveChildren.
*
* In practice all non-IE browsers allow you to add children to any node, but
* the behavior is inconsistent:
*
* <pre>
* var a = goog.dom.createElement(goog.dom.TagName.BR);
* a.appendChild(document.createTextNode('foo'));
* a.appendChild(document.createTextNode('bar'));
* console.log(a.childNodes.length); // 2
* console.log(a.innerHTML); // Chrome: "", IE9: "foobar", FF3.5: "foobar"
* </pre>
*
* For more information, see:
* http://dev.w3.org/html5/markup/syntax.html#syntax-elements
*
* TODO(user): Rename shouldAllowChildren() ?
*
* @param {Node} node The node to check.
* @return {boolean} Whether the node can contain children.
*/
goog.dom.canHaveChildren = function(node) {
'use strict';
if (node.nodeType != goog.dom.NodeType.ELEMENT) {
return false;
}
switch (/** @type {!Element} */ (node).tagName) {
case String(goog.dom.TagName.APPLET):
case String(goog.dom.TagName.AREA):
case String(goog.dom.TagName.BASE):
case String(goog.dom.TagName.BR):
case String(goog.dom.TagName.COL):
case String(goog.dom.TagName.COMMAND):
case String(goog.dom.TagName.EMBED):
case String(goog.dom.TagName.FRAME):
case String(goog.dom.TagName.HR):
case String(goog.dom.TagName.IMG):
case String(goog.dom.TagName.INPUT):
case String(goog.dom.TagName.IFRAME):
case String(goog.dom.TagName.ISINDEX):
case String(goog.dom.TagName.KEYGEN):
case String(goog.dom.TagName.LINK):
case String(goog.dom.TagName.NOFRAMES):
case String(goog.dom.TagName.NOSCRIPT):
case String(goog.dom.TagName.META):
case String(goog.dom.TagName.OBJECT):
case String(goog.dom.TagName.PARAM):
case String(goog.dom.TagName.SCRIPT):
case String(goog.dom.TagName.SOURCE):
case String(goog.dom.TagName.STYLE):
case String(goog.dom.TagName.TRACK):
case String(goog.dom.TagName.WBR):
return false;
}
return true;
};
/**
* Appends a child to a node.
* @param {Node} parent Parent.
* @param {Node} child Child.
*/
goog.dom.appendChild = function(parent, child) {
'use strict';
goog.asserts.assert(
parent != null && child != null,
'goog.dom.appendChild expects non-null arguments');
parent.appendChild(child);
};
/**
* Appends a node with text or other nodes.
* @param {!Node} parent The node to append nodes to.
* @param {...goog.dom.Appendable} var_args The things to append to the node.
* If this is a Node it is appended as is.
* If this is a string then a text node is appended.
* If this is an array like object then fields 0 to length - 1 are appended.
*/
goog.dom.append = function(parent, var_args) {
'use strict';
goog.dom.append_(goog.dom.getOwnerDocument(parent), parent, arguments, 1);
};
/**
* Removes all the child nodes on a DOM node.
* @param {Node} node Node to remove children from.
* @return {void}
*/
goog.dom.removeChildren = function(node) {
'use strict';
// Note: Iterations over live collections can be slow, this is the fastest
// we could find. The double parenthesis are used to prevent JsCompiler and
// strict warnings.
var child;
while ((child = node.firstChild)) {
node.removeChild(child);
}
};
/**
* Inserts a new node before an existing reference node (i.e. as the previous
* sibling). If the reference node has no parent, then does nothing.
* @param {Node} newNode Node to insert.
* @param {Node} refNode Reference node to insert before.
*/
goog.dom.insertSiblingBefore = function(newNode, refNode) {
'use strict';
goog.asserts.assert(
newNode != null && refNode != null,
'goog.dom.insertSiblingBefore expects non-null arguments');
if (refNode.parentNode) {
refNode.parentNode.insertBefore(newNode, refNode);
}
};
/**
* Inserts a new node after an existing reference node (i.e. as the next
* sibling). If the reference node has no parent, then does nothing.
* @param {Node} newNode Node to insert.
* @param {Node} refNode Reference node to insert after.
* @return {void}
*/
goog.dom.insertSiblingAfter = function(newNode, refNode) {
'use strict';
goog.asserts.assert(
newNode != null && refNode != null,
'goog.dom.insertSiblingAfter expects non-null arguments');
if (refNode.parentNode) {
refNode.parentNode.insertBefore(newNode, refNode.nextSibling);
}
};
/**
* Insert a child at a given index. If index is larger than the number of child
* nodes that the parent currently has, the node is inserted as the last child
* node.
* @param {Element} parent The element into which to insert the child.
* @param {Node} child The element to insert.
* @param {number} index The index at which to insert the new child node. Must
* not be negative.
* @return {void}
*/
goog.dom.insertChildAt = function(parent, child, index) {
'use strict';
// Note that if the second argument is null, insertBefore
// will append the child at the end of the list of children.
goog.asserts.assert(
parent != null, 'goog.dom.insertChildAt expects a non-null parent');
parent.insertBefore(
/** @type {!Node} */ (child), parent.childNodes[index] || null);
};
/**
* Removes a node from its parent.
* @param {Node} node The node to remove.
* @return {Node} The node removed if removed; else, null.
*/
goog.dom.removeNode = function(node) {
'use strict';
return node && node.parentNode ? node.parentNode.removeChild(node) : null;
};
/**
* Replaces a node in the DOM tree. Will do nothing if `oldNode` has no
* parent.
* @param {Node} newNode Node to insert.
* @param {Node} oldNode Node to replace.
*/
goog.dom.replaceNode = function(newNode, oldNode) {
'use strict';
goog.asserts.assert(
newNode != null && oldNode != null,
'goog.dom.replaceNode expects non-null arguments');
var parent = oldNode.parentNode;
if (parent) {
parent.replaceChild(newNode, oldNode);
}
};
/**
* Replaces child nodes of `target` with child nodes of `source`. This is
* roughly equivalent to `target.innerHTML = source.innerHTML` which is not
* compatible with Trusted Types.
* @param {?Node} target Node to clean and replace its children.
* @param {?Node} source Node to get the children from. The nodes will be cloned
* so they will stay in source.
*/
goog.dom.copyContents = function(target, source) {
'use strict';
goog.asserts.assert(
target != null && source != null,
'goog.dom.copyContents expects non-null arguments');
var childNodes = source.cloneNode(/* deep= */ true).childNodes;
goog.dom.removeChildren(target);
while (childNodes.length) {
target.appendChild(childNodes[0]);
}
};
/**
* Flattens an element. That is, removes it and replace it with its children.
* Does nothing if the element is not in the document.
* @param {Element} element The element to flatten.
* @return {Element|undefined} The original element, detached from the document
* tree, sans children; or undefined, if the element was not in the document
* to begin with.
*/
goog.dom.flattenElement = function(element) {
'use strict';
var child, parent = element.parentNode;
if (parent && parent.nodeType != goog.dom.NodeType.DOCUMENT_FRAGMENT) {
// Use IE DOM method (supported by Opera too) if available
if (element.removeNode) {
return /** @type {Element} */ (element.removeNode(false));
} else {
// Move all children of the original node up one level.
while ((child = element.firstChild)) {
parent.insertBefore(child, element);
}
// Detach the original element.
return /** @type {Element} */ (goog.dom.removeNode(element));
}
}
};
/**
* Returns an array containing just the element children of the given element.
* @param {Element} element The element whose element children we want.
* @return {!(Array<!Element>|NodeList<!Element>)} An array or array-like list
* of just the element children of the given element.
*/
goog.dom.getChildren = function(element) {
'use strict';
// We check if the children attribute is supported for child elements
// since IE8 misuses the attribute by also including comments.
if (element.children != undefined) {
return element.children;
}
// Fall back to manually filtering the element's child nodes.
return Array.prototype.filter.call(element.childNodes, function(node) {
return node.nodeType == goog.dom.NodeType.ELEMENT;
});
};
/**
* Returns the first child node that is an element.
* @param {Node} node The node to get the first child element of.
* @return {Element} The first child node of `node` that is an element.
*/
goog.dom.getFirstElementChild = function(node) {
'use strict';
if (node.firstElementChild !== undefined) {
return /** @type {!Element} */ (node).firstElementChild;
}
return goog.dom.getNextElementNode_(node.firstChild, true);
};
/**
* Returns the last child node that is an element.
* @param {Node} node The node to get the last child element of.
* @return {Element} The last child node of `node` that is an element.
*/
goog.dom.getLastElementChild = function(node) {
'use strict';
if (node.lastElementChild !== undefined) {
return /** @type {!Element} */ (node).lastElementChild;
}
return goog.dom.getNextElementNode_(node.lastChild, false);
};
/**
* Returns the first next sibling that is an element.
* @param {Node} node The node to get the next sibling element of.
* @return {Element} The next sibling of `node` that is an element.
*/
goog.dom.getNextElementSibling = function(node) {
'use strict';
if (node.nextElementSibling !== undefined) {
return /** @type {!Element} */ (node).nextElementSibling;
}
return goog.dom.getNextElementNode_(node.nextSibling, true);
};
/**
* Returns the first previous sibling that is an element.
* @param {Node} node The node to get the previous sibling element of.
* @return {Element} The first previous sibling of `node` that is
* an element.
*/
goog.dom.getPreviousElementSibling = function(node) {
'use strict';
if (node.previousElementSibling !== undefined) {
return /** @type {!Element} */ (node).previousElementSibling;
}
return goog.dom.getNextElementNode_(node.previousSibling, false);
};
/**
* Returns the first node that is an element in the specified direction,
* starting with `node`.
* @param {Node} node The node to get the next element from.
* @param {boolean} forward Whether to look forwards or backwards.
* @return {Element} The first element.
* @private
*/
goog.dom.getNextElementNode_ = function(node, forward) {
'use strict';
while (node && node.nodeType != goog.dom.NodeType.ELEMENT) {
node = forward ? node.nextSibling : node.previousSibling;
}
return /** @type {Element} */ (node);
};
/**
* Returns the next node in source order from the given node.
* @param {Node} node The node.
* @return {Node} The next node in the DOM tree, or null if this was the last
* node.
*/
goog.dom.getNextNode = function(node) {
'use strict';
if (!node) {
return null;
}
if (node.firstChild) {
return node.firstChild;
}
while (node && !node.nextSibling) {
node = node.parentNode;
}
return node ? node.nextSibling : null;
};
/**
* Returns the previous node in source order from the given node.
* @param {Node} node The node.
* @return {Node} The previous node in the DOM tree, or null if this was the
* first node.
*/
goog.dom.getPreviousNode = function(node) {
'use strict';
if (!node) {
return null;
}
if (!node.previousSibling) {
return node.parentNode;
}
node = node.previousSibling;
while (node && node.lastChild) {
node = node.lastChild;
}
return node;
};
/**
* Whether the object looks like a DOM node.
* @param {?} obj The object being tested for node likeness.
* @return {boolean} Whether the object looks like a DOM node.
*/
goog.dom.isNodeLike = function(obj) {
'use strict';
return goog.isObject(obj) && obj.nodeType > 0;
};
/**
* Whether the object looks like an Element.
* @param {?} obj The object being tested for Element likeness.
* @return {boolean} Whether the object looks like an Element.
*/
goog.dom.isElement = function(obj) {
'use strict';
return goog.isObject(obj) && obj.nodeType == goog.dom.NodeType.ELEMENT;
};
/**
* Returns true if the specified value is a Window object. This includes the
* global window for HTML pages, and iframe windows.
* @param {?} obj Variable to test.
* @return {boolean} Whether the variable is a window.
*/
goog.dom.isWindow = function(obj) {
'use strict';
return goog.isObject(obj) && obj['window'] == obj;
};
/**
* Returns an element's parent, if it's an Element.
* @param {Element} element The DOM element.
* @return {Element} The parent, or null if not an Element.
*/
goog.dom.getParentElement = function(element) {
'use strict';
var parent;
if (goog.dom.BrowserFeature.CAN_USE_PARENT_ELEMENT_PROPERTY) {
var isIe9 = goog.userAgent.IE && goog.userAgent.isVersionOrHigher('9') &&
!goog.userAgent.isVersionOrHigher('10');
// SVG elements in IE9 can't use the parentElement property.
// goog.global['SVGElement'] is not defined in IE9 quirks mode.
if (!(isIe9 && goog.global['SVGElement'] &&
element instanceof goog.global['SVGElement'])) {
parent = element.parentElement;
if (parent) {
return parent;
}
}
}
parent = element.parentNode;
return goog.dom.isElement(parent) ? /** @type {!Element} */ (parent) : null;
};
/**
* Whether a node contains another node.
* @param {?Node|undefined} parent The node that should contain the other node.
* @param {?Node|undefined} descendant The node to test presence of.
* @return {boolean} Whether the parent node contains the descendant node.
*/
goog.dom.contains = function(parent, descendant) {
'use strict';
if (!parent || !descendant) {
return false;
}
// We use browser specific methods for this if available since it is faster
// that way.
// IE DOM
if (parent.contains && descendant.nodeType == goog.dom.NodeType.ELEMENT) {
return parent == descendant || parent.contains(descendant);
}
// W3C DOM Level 3
if (typeof parent.compareDocumentPosition != 'undefined') {
return parent == descendant ||
Boolean(parent.compareDocumentPosition(descendant) & 16);
}
// W3C DOM Level 1
while (descendant && parent != descendant) {
descendant = descendant.parentNode;
}
return descendant == parent;
};
/**
* Compares the document order of two nodes, returning 0 if they are the same
* node, a negative number if node1 is before node2, and a positive number if
* node2 is before node1. Note that we compare the order the tags appear in the
* document so in the tree <b><i>text</i></b> the B node is considered to be
* before the I node.
*
* @param {Node} node1 The first node to compare.
* @param {Node} node2 The second node to compare.
* @return {number} 0 if the nodes are the same node, a negative number if node1
* is before node2, and a positive number if node2 is before node1.
*/
goog.dom.compareNodeOrder = function(node1, node2) {
'use strict';
// Fall out quickly for equality.
if (node1 == node2) {
return 0;
}
// Use compareDocumentPosition where available
if (node1.compareDocumentPosition) {
// 4 is the bitmask for FOLLOWS.
return node1.compareDocumentPosition(node2) & 2 ? 1 : -1;
}
// Special case for document nodes on IE 7 and 8.
if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9)) {
if (node1.nodeType == goog.dom.NodeType.DOCUMENT) {
return -1;
}
if (node2.nodeType == goog.dom.NodeType.DOCUMENT) {
return 1;
}
}
// Process in IE using sourceIndex - we check to see if the first node has
// a source index or if its parent has one.
if ('sourceIndex' in node1 ||
(node1.parentNode && 'sourceIndex' in node1.parentNode)) {
var isElement1 = node1.nodeType == goog.dom.NodeType.ELEMENT;
var isElement2 = node2.nodeType == goog.dom.NodeType.ELEMENT;
if (isElement1 && isElement2) {
return node1.sourceIndex - node2.sourceIndex;
} else {
var parent1 = node1.parentNode;
var parent2 = node2.parentNode;
if (parent1 == parent2) {
return goog.dom.compareSiblingOrder_(node1, node2);
}
if (!isElement1 && goog.dom.contains(parent1, node2)) {
return -1 * goog.dom.compareParentsDescendantNodeIe_(node1, node2);
}
if (!isElement2 && goog.dom.contains(parent2, node1)) {
return goog.dom.compareParentsDescendantNodeIe_(node2, node1);
}
return (isElement1 ? node1.sourceIndex : parent1.sourceIndex) -
(isElement2 ? node2.sourceIndex : parent2.sourceIndex);
}
}
// For Safari, we compare ranges.
var doc = goog.dom.getOwnerDocument(node1);
var range1, range2;
range1 = doc.createRange();
range1.selectNode(node1);
range1.collapse(true);
range2 = doc.createRange();
range2.selectNode(node2);
range2.collapse(true);
return range1.compareBoundaryPoints(
goog.global['Range'].START_TO_END, range2);
};
/**
* Utility function to compare the position of two nodes, when
* `textNode`'s parent is an ancestor of `node`. If this entry
* condition is not met, this function will attempt to reference a null object.
* @param {!Node} textNode The textNode to compare.
* @param {Node} node The node to compare.
* @return {number} -1 if node is before textNode, +1 otherwise.
* @private
*/
goog.dom.compareParentsDescendantNodeIe_ = function(textNode, node) {
'use strict';
var parent = textNode.parentNode;
if (parent == node) {
// If textNode is a child of node, then node comes first.
return -1;
}
var sibling = node;
while (sibling.parentNode != parent) {
sibling = sibling.parentNode;
}
return goog.dom.compareSiblingOrder_(sibling, textNode);
};
/**
* Utility function to compare the position of two nodes known to be non-equal
* siblings.
* @param {Node} node1 The first node to compare.
* @param {!Node} node2 The second node to compare.
* @return {number} -1 if node1 is before node2, +1 otherwise.
* @private
*/
goog.dom.compareSiblingOrder_ = function(node1, node2) {
'use strict';
var s = node2;
while ((s = s.previousSibling)) {
if (s == node1) {
// We just found node1 before node2.
return -1;
}
}
// Since we didn't find it, node1 must be after node2.
return 1;
};
/**
* Find the deepest common ancestor of the given nodes.
* @param {...Node} var_args The nodes to find a common ancestor of.
* @return {Node} The common ancestor of the nodes, or null if there is none.
* null will only be returned if two or more of the nodes are from different
* documents.
*/
goog.dom.findCommonAncestor = function(var_args) {
'use strict';
var i, count = arguments.length;
if (!count) {
return null;
} else if (count == 1) {
return arguments[0];
}
var paths = [];
var minLength = Infinity;
for (i = 0; i < count; i++) {
// Compute the list of ancestors.
var ancestors = [];
var node = arguments[i];
while (node) {
ancestors.unshift(node);
node = node.parentNode;
}
// Save the list for comparison.
paths.push(ancestors);
minLength = Math.min(minLength, ancestors.length);
}
var output = null;
for (i = 0; i < minLength; i++) {
var first = paths[0][i];
for (var j = 1; j < count; j++) {
if (first != paths[j][i]) {
return output;
}
}
output = first;
}
return output;
};
/**
* Returns whether node is in a document or detached. Throws an error if node
* itself is a document. This specifically handles two cases beyond naive use of
* builtins: (1) it works correctly in IE, and (2) it works for elements from
* different documents/iframes. If neither of these considerations are relevant
* then a simple `document.contains(node)` may be used instead.
* @param {!Node} node
* @return {boolean}
*/
goog.dom.isInDocument = function(node) {
'use strict';
return (node.ownerDocument.compareDocumentPosition(node) & 16) == 16;
};
/**
* Returns the owner document for a node.
* @param {Node|Window} node The node to get the document for.
* @return {!Document} The document owning the node.
*/
goog.dom.getOwnerDocument = function(node) {
'use strict';
// TODO(nnaze): Update param signature to be non-nullable.
goog.asserts.assert(node, 'Node cannot be null or undefined.');
return /** @type {!Document} */ (
node.nodeType == goog.dom.NodeType.DOCUMENT ? node : node.ownerDocument ||
node.document);
};
/**
* Cross-browser function for getting the document element of a frame or iframe.
* @param {Element} frame Frame element.
* @return {!Document} The frame content document.
*/
goog.dom.getFrameContentDocument = function(frame) {
'use strict';
return frame.contentDocument ||
/** @type {!HTMLFrameElement} */ (frame).contentWindow.document;
};
/**
* Cross-browser function for getting the window of a frame or iframe.
* @param {Element} frame Frame element.
* @return {Window} The window associated with the given frame, or null if none
* exists.
*/
goog.dom.getFrameContentWindow = function(frame) {
'use strict';
try {
return frame.contentWindow ||
(frame.contentDocument ? goog.dom.getWindow(frame.contentDocument) :
null);
} catch (e) {
// NOTE(user): In IE8, checking the contentWindow or contentDocument
// properties will throw a "Unspecified Error" exception if the iframe is
// not inserted in the DOM. If we get this we can be sure that no window
// exists, so return null.
}
return null;
};
/**
* Sets the text content of a node, with cross-browser support.
* @param {Node} node The node to change the text content of.
* @param {string|number} text The value that should replace the node's content.
* @return {void}
*/
goog.dom.setTextContent = function(node, text) {
'use strict';
goog.asserts.assert(
node != null,
'goog.dom.setTextContent expects a non-null value for node');
if ('textContent' in node) {
node.textContent = text;
} else if (node.nodeType == goog.dom.NodeType.TEXT) {
/** @type {!Text} */ (node).data = String(text);
} else if (
node.firstChild && node.firstChild.nodeType == goog.dom.NodeType.TEXT) {
// If the first child is a text node we just change its data and remove the
// rest of the children.
while (node.lastChild != node.firstChild) {
node.removeChild(goog.asserts.assert(node.lastChild));
}
/** @type {!Text} */ (node.firstChild).data = String(text);
} else {
goog.dom.removeChildren(node);
var doc = goog.dom.getOwnerDocument(node);
node.appendChild(doc.createTextNode(String(text)));
}
};
/**
* Gets the outerHTML of a node, which is like innerHTML, except that it
* actually contains the HTML of the node itself.
* @param {Element} element The element to get the HTML of.
* @return {string} The outerHTML of the given element.
*/
goog.dom.getOuterHtml = function(element) {
'use strict';
goog.asserts.assert(
element !== null,
'goog.dom.getOuterHtml expects a non-null value for element');
// IE, Opera and WebKit all have outerHTML.
if ('outerHTML' in element) {
return element.outerHTML;
} else {
var doc = goog.dom.getOwnerDocument(element);
var div = goog.dom.createElement_(doc, goog.dom.TagName.DIV);
div.appendChild(element.cloneNode(true));
return div.innerHTML;
}
};
/**
* Finds the first descendant node that matches the filter function, using depth
* first search. This function offers the most general purpose way of finding a
* matching element.
*
* Prefer using `querySelector` if the matching criteria can be expressed as a
* CSS selector, or `goog.dom.findElement` if you would filter for `nodeType ==
* Node.ELEMENT_NODE`.
*
* @param {Node} root The root of the tree to search.
* @param {function(Node) : boolean} p The filter function.
* @return {Node|undefined} The found node or undefined if none is found.
*/
goog.dom.findNode = function(root, p) {
'use strict';
var rv = [];
var found = goog.dom.findNodes_(root, p, rv, true);
return found ? rv[0] : undefined;
};
/**
* Finds all the descendant nodes that match the filter function, using depth
* first search. This function offers the most general-purpose way
* of finding a set of matching elements.
*
* Prefer using `querySelectorAll` if the matching criteria can be expressed as
* a CSS selector, or `goog.dom.findElements` if you would filter for
* `nodeType == Node.ELEMENT_NODE`.
*
* @param {Node} root The root of the tree to search.
* @param {function(Node) : boolean} p The filter function.
* @return {!Array<!Node>} The found nodes or an empty array if none are found.
*/
goog.dom.findNodes = function(root, p) {
'use strict';
var rv = [];
goog.dom.findNodes_(root, p, rv, false);
return rv;
};
/**
* Finds the first or all the descendant nodes that match the filter function,
* using a depth first search.
* @param {Node} root The root of the tree to search.
* @param {function(Node) : boolean} p The filter function.
* @param {!Array<!Node>} rv The found nodes are added to this array.
* @param {boolean} findOne If true we exit after the first found node.
* @return {boolean} Whether the search is complete or not. True in case findOne
* is true and the node is found. False otherwise.
* @private
*/
goog.dom.findNodes_ = function(root, p, rv, findOne) {
'use strict';
if (root != null) {
var child = root.firstChild;
while (child) {
if (p(child)) {
rv.push(child);
if (findOne) {
return true;
}
}
if (goog.dom.findNodes_(child, p, rv, findOne)) {
return true;
}
child = child.nextSibling;
}
}
return false;
};
/**
* Finds the first descendant element (excluding `root`) that matches the filter
* function, using depth first search. Prefer using `querySelector` if the
* matching criteria can be expressed as a CSS selector.
*
* @param {!Element | !Document} root
* @param {function(!Element): boolean} pred Filter function.
* @return {?Element} First matching element or null if there is none.
*/
goog.dom.findElement = function(root, pred) {
'use strict';
var stack = goog.dom.getChildrenReverse_(root);
while (stack.length > 0) {
var next = stack.pop();
if (pred(next)) return next;
for (var c = next.lastElementChild; c; c = c.previousElementSibling) {
stack.push(c);
}
}
return null;
};
/**
* Finds all the descendant elements (excluding `root`) that match the filter
* function, using depth first search. Prefer using `querySelectorAll` if the
* matching criteria can be expressed as a CSS selector.
*
* @param {!Element | !Document} root
* @param {function(!Element): boolean} pred Filter function.
* @return {!Array<!Element>}
*/
goog.dom.findElements = function(root, pred) {
'use strict';
var result = [], stack = goog.dom.getChildrenReverse_(root);
while (stack.length > 0) {
var next = stack.pop();
if (pred(next)) result.push(next);
for (var c = next.lastElementChild; c; c = c.previousElementSibling) {
stack.push(c);
}
}
return result;
};
/**
* @param {!Element | !Document} node
* @return {!Array<!Element>} node's child elements in reverse order.
* @private
*/
goog.dom.getChildrenReverse_ = function(node) {
'use strict';
// document.lastElementChild doesn't exist in IE9; fall back to
// documentElement.
if (node.nodeType == goog.dom.NodeType.DOCUMENT) {
return [node.documentElement];
} else {
var children = [];
for (var c = node.lastElementChild; c; c = c.previousElementSibling) {
children.push(c);
}
return children;
}
};
/**
* Map of tags whose content to ignore when calculating text length.
* @private {!Object<string, number>}
* @const
*/
goog.dom.TAGS_TO_IGNORE_ = {
'SCRIPT': 1,
'STYLE': 1,
'HEAD': 1,
'IFRAME': 1,
'OBJECT': 1
};
/**
* Map of tags which have predefined values with regard to whitespace.
* @private {!Object<string, string>}
* @const
*/
goog.dom.PREDEFINED_TAG_VALUES_ = {
'IMG': ' ',
'BR': '\n'
};
/**
* Returns true if the element has a tab index that allows it to receive
* keyboard focus (tabIndex >= 0), false otherwise. Note that some elements
* natively support keyboard focus, even if they have no tab index.
* @param {!Element} element Element to check.
* @return {boolean} Whether the element has a tab index that allows keyboard
* focus.
*/
goog.dom.isFocusableTabIndex = function(element) {
'use strict';
return goog.dom.hasSpecifiedTabIndex_(element) &&
goog.dom.isTabIndexFocusable_(element);
};
/**
* Enables or disables keyboard focus support on the element via its tab index.
* Only elements for which {@link goog.dom.isFocusableTabIndex} returns true
* (or elements that natively support keyboard focus, like form elements) can
* receive keyboard focus. See http://go/tabindex for more info.
* @param {Element} element Element whose tab index is to be changed.
* @param {boolean} enable Whether to set or remove a tab index on the element
* that supports keyboard focus.
* @return {void}
*/
goog.dom.setFocusableTabIndex = function(element, enable) {
'use strict';
if (enable) {
element.tabIndex = 0;
} else {
// Set tabIndex to -1 first, then remove it. This is a workaround for
// Safari (confirmed in version 4 on Windows). When removing the attribute
// without setting it to -1 first, the element remains keyboard focusable
// despite not having a tabIndex attribute anymore.
element.tabIndex = -1;
element.removeAttribute('tabIndex'); // Must be camelCase!
}
};
/**
* Returns true if the element can be focused, i.e. it has a tab index that
* allows it to receive keyboard focus (tabIndex >= 0), or it is an element
* that natively supports keyboard focus.
* @param {!Element} element Element to check.
* @return {boolean} Whether the element allows keyboard focus.
*/
goog.dom.isFocusable = function(element) {
'use strict';
var focusable;
// Some elements can have unspecified tab index and still receive focus.
if (goog.dom.nativelySupportsFocus_(element)) {
// Make sure the element is not disabled ...
focusable = !element.disabled &&
// ... and if a tab index is specified, it allows focus.
(!goog.dom.hasSpecifiedTabIndex_(element) ||
goog.dom.isTabIndexFocusable_(element));
} else {
focusable = goog.dom.isFocusableTabIndex(element);
}
// IE requires elements to be visible in order to focus them.
return focusable && goog.userAgent.IE ?
goog.dom.hasNonZeroBoundingRect_(/** @type {!HTMLElement} */ (element)) :
focusable;
};
/**
* Returns true if the element has a specified tab index.
* @param {!Element} element Element to check.
* @return {boolean} Whether the element has a specified tab index.
* @private
*/
goog.dom.hasSpecifiedTabIndex_ = function(element) {
'use strict';
return element.hasAttribute('tabindex');
};
/**
* Returns true if the element's tab index allows the element to be focused.
* @param {!Element} element Element to check.
* @return {boolean} Whether the element's tab index allows focus.
* @private
*/
goog.dom.isTabIndexFocusable_ = function(element) {
'use strict';
var index = /** @type {!HTMLElement} */ (element).tabIndex;
// NOTE: IE9 puts tabIndex in 16-bit int, e.g. -2 is 65534.
return typeof (index) === 'number' && index >= 0 && index < 32768;
};
/**
* Returns true if the element is focusable even when tabIndex is not set.
* @param {!Element} element Element to check.
* @return {boolean} Whether the element natively supports focus.
* @private
*/
goog.dom.nativelySupportsFocus_ = function(element) {
'use strict';
return (
element.tagName == goog.dom.TagName.A && element.hasAttribute('href') ||
element.tagName == goog.dom.TagName.INPUT ||
element.tagName == goog.dom.TagName.TEXTAREA ||
element.tagName == goog.dom.TagName.SELECT ||
element.tagName == goog.dom.TagName.BUTTON);
};
/**
* Returns true if the element has a bounding rectangle that would be visible
* (i.e. its width and height are greater than zero).
* @param {!HTMLElement} element Element to check.
* @return {boolean} Whether the element has a non-zero bounding rectangle.
* @private
*/
goog.dom.hasNonZeroBoundingRect_ = function(element) {
'use strict';
var rect;
if (typeof element['getBoundingClientRect'] !== 'function' ||
// In IE, getBoundingClientRect throws on detached nodes.
(goog.userAgent.IE && element.parentElement == null)) {
rect = {'height': element.offsetHeight, 'width': element.offsetWidth};
} else {
rect = element.getBoundingClientRect();
}
return rect != null && rect.height > 0 && rect.width > 0;
};
/**
* Returns the text content of the current node, without markup and invisible
* symbols. New lines are stripped and whitespace is collapsed,
* such that each character would be visible.
*
* In browsers that support it, innerText is used. Other browsers attempt to
* simulate it via node traversal. Line breaks are canonicalized in IE.
*
* @param {Node} node The node from which we are getting content.
* @return {string} The text content.
*/
goog.dom.getTextContent = function(node) {
'use strict';
var textContent;
var buf = [];
goog.dom.getTextContent_(node, buf, true);
textContent = buf.join('');
// Strip ­ entities. goog.format.insertWordBreaks inserts them in Opera.
textContent = textContent.replace(/ \xAD /g, ' ').replace(/\xAD/g, '');
// Strip ​ entities. goog.format.insertWordBreaks inserts them in IE8.
textContent = textContent.replace(/\u200B/g, '');
textContent = textContent.replace(/ +/g, ' ');
if (textContent != ' ') {
textContent = textContent.replace(/^\s*/, '');
}
return textContent;
};
/**
* Returns the text content of the current node, without markup.
*
* Unlike `getTextContent` this method does not collapse whitespaces
* or normalize lines breaks.
*
* @param {Node} node The node from which we are getting content.
* @return {string} The raw text content.
*/
goog.dom.getRawTextContent = function(node) {
'use strict';
var buf = [];
goog.dom.getTextContent_(node, buf, false);
return buf.join('');
};
/**
* Recursive support function for text content retrieval.
*
* @param {Node} node The node from which we are getting content.
* @param {Array<string>} buf string buffer.
* @param {boolean} normalizeWhitespace Whether to normalize whitespace.
* @private
*/
goog.dom.getTextContent_ = function(node, buf, normalizeWhitespace) {
'use strict';
if (node.nodeName in goog.dom.TAGS_TO_IGNORE_) {
// ignore certain tags
} else if (node.nodeType == goog.dom.NodeType.TEXT) {
if (normalizeWhitespace) {
buf.push(String(node.nodeValue).replace(/(\r\n|\r|\n)/g, ''));
} else {
buf.push(node.nodeValue);
}
} else if (node.nodeName in goog.dom.PREDEFINED_TAG_VALUES_) {
buf.push(goog.dom.PREDEFINED_TAG_VALUES_[node.nodeName]);
} else {
var child = node.firstChild;
while (child) {
goog.dom.getTextContent_(child, buf, normalizeWhitespace);
child = child.nextSibling;
}
}
};
/**
* Returns the text length of the text contained in a node, without markup. This
* is equivalent to the selection length if the node was selected, or the number
* of cursor movements to traverse the node. Images & BRs take one space. New
* lines are ignored.
*
* @param {Node} node The node whose text content length is being calculated.
* @return {number} The length of `node`'s text content.
*/
goog.dom.getNodeTextLength = function(node) {
'use strict';
return goog.dom.getTextContent(node).length;
};
/**
* Returns the text offset of a node relative to one of its ancestors. The text
* length is the same as the length calculated by goog.dom.getNodeTextLength.
*
* @param {Node} node The node whose offset is being calculated.
* @param {Node=} opt_offsetParent The node relative to which the offset will
* be calculated. Defaults to the node's owner document's body.
* @return {number} The text offset.
*/
goog.dom.getNodeTextOffset = function(node, opt_offsetParent) {
'use strict';
var root = opt_offsetParent || goog.dom.getOwnerDocument(node).body;
var buf = [];
while (node && node != root) {
var cur = node;
while ((cur = cur.previousSibling)) {
buf.unshift(goog.dom.getTextContent(cur));
}
node = node.parentNode;
}
// Trim left to deal with FF cases when there might be line breaks and empty
// nodes at the front of the text
return goog.string.trimLeft(buf.join('')).replace(/ +/g, ' ').length;
};
/**
* Returns the node at a given offset in a parent node. If an object is
* provided for the optional third parameter, the node and the remainder of the
* offset will stored as properties of this object.
* @param {Node} parent The parent node.
* @param {number} offset The offset into the parent node.
* @param {Object=} opt_result Object to be used to store the return value. The
* return value will be stored in the form {node: Node, remainder: number}
* if this object is provided.
* @return {Node} The node at the given offset.
*/
goog.dom.getNodeAtOffset = function(parent, offset, opt_result) {
'use strict';
var stack = [parent], pos = 0, cur = null;
while (stack.length > 0 && pos < offset) {
cur = stack.pop();
if (cur.nodeName in goog.dom.TAGS_TO_IGNORE_) {
// ignore certain tags
} else if (cur.nodeType == goog.dom.NodeType.TEXT) {
var text = cur.nodeValue.replace(/(\r\n|\r|\n)/g, '').replace(/ +/g, ' ');
pos += text.length;
} else if (cur.nodeName in goog.dom.PREDEFINED_TAG_VALUES_) {
pos += goog.dom.PREDEFINED_TAG_VALUES_[cur.nodeName].length;
} else {
for (var i = cur.childNodes.length - 1; i >= 0; i--) {
stack.push(cur.childNodes[i]);
}
}
}
if (goog.isObject(opt_result)) {
opt_result.remainder = cur ? cur.nodeValue.length + offset - pos - 1 : 0;
opt_result.node = cur;
}
return cur;
};
/**
* Returns true if the object is a `NodeList`. To qualify as a NodeList,
* the object must have a numeric length property and an item function (which
* has type 'string' on IE for some reason).
* @param {Object} val Object to test.
* @return {boolean} Whether the object is a NodeList.
*/
goog.dom.isNodeList = function(val) {
'use strict';
// TODO(attila): Now the isNodeList is part of goog.dom we can use
// goog.userAgent to make this simpler.
// A NodeList must have a length property of type 'number' on all platforms.
if (val && typeof val.length == 'number') {
// A NodeList is an object everywhere except Safari, where it's a function.
if (goog.isObject(val)) {
// A NodeList must have an item function (on non-IE platforms) or an item
// property of type 'string' (on IE).
return typeof val.item == 'function' || typeof val.item == 'string';
} else if (typeof val === 'function') {
// On Safari, a NodeList is a function with an item property that is also
// a function.
return typeof /** @type {?} */ (val.item) == 'function';
}
}
// Not a NodeList.
return false;
};
/**
* Walks up the DOM hierarchy returning the first ancestor that has the passed
* tag name and/or class name. If the passed element matches the specified
* criteria, the element itself is returned.
* @param {Node} element The DOM node to start with.
* @param {?(goog.dom.TagName<T>|string)=} opt_tag The tag name to match (or
* null/undefined to match only based on class name).
* @param {?string=} opt_class The class name to match (or null/undefined to
* match only based on tag name).
* @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
* dom.
* @return {?R} The first ancestor that matches the passed criteria, or
* null if no match is found. The return type is {?Element} if opt_tag is
* not a member of goog.dom.TagName or a more specific type if it is (e.g.
* {?HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.getAncestorByTagNameAndClass = function(
element, opt_tag, opt_class, opt_maxSearchSteps) {
'use strict';
if (!opt_tag && !opt_class) {
return null;
}
var tagName = opt_tag ? String(opt_tag).toUpperCase() : null;
return /** @type {Element} */ (goog.dom.getAncestor(element, function(node) {
'use strict';
return (!tagName || node.nodeName == tagName) &&
(!opt_class ||
typeof node.className === 'string' &&
goog.array.contains(node.className.split(/\s+/), opt_class));
}, true, opt_maxSearchSteps));
};
/**
* Walks up the DOM hierarchy returning the first ancestor that has the passed
* class name. If the passed element matches the specified criteria, the
* element itself is returned.
* @param {Node} element The DOM node to start with.
* @param {string} className The class name to match.
* @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
* dom.
* @return {Element} The first ancestor that matches the passed criteria, or
* null if none match.
*/
goog.dom.getAncestorByClass = function(element, className, opt_maxSearchSteps) {
'use strict';
return goog.dom.getAncestorByTagNameAndClass(
element, null, className, opt_maxSearchSteps);
};
/**
* Walks up the DOM hierarchy returning the first ancestor that passes the
* matcher function.
* @param {Node} element The DOM node to start with.
* @param {function(!Node) : boolean} matcher A function that returns true if
* the passed node matches the desired criteria.
* @param {boolean=} opt_includeNode If true, the node itself is included in
* the search (the first call to the matcher will pass startElement as
* the node to test).
* @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
* dom.
* @return {Node} DOM node that matched the matcher, or null if there was
* no match.
*/
goog.dom.getAncestor = function(
element, matcher, opt_includeNode, opt_maxSearchSteps) {
'use strict';
if (element && !opt_includeNode) {
element = element.parentNode;
}
var steps = 0;
while (element &&
(opt_maxSearchSteps == null || steps <= opt_maxSearchSteps)) {
goog.asserts.assert(element.name != 'parentNode');
if (matcher(element)) {
return element;
}
element = element.parentNode;
steps++;
}
// Reached the root of the DOM without a match
return null;
};
/**
* Determines the active element in the given document.
* @param {Document} doc The document to look in.
* @return {Element} The active element.
*/
goog.dom.getActiveElement = function(doc) {
'use strict';
// While in an iframe, IE9 will throw "Unspecified error" when accessing
// activeElement.
try {
var activeElement = doc && doc.activeElement;
// While not in an iframe, IE9-11 sometimes gives null.
// While in an iframe, IE11 sometimes returns an empty object.
return activeElement && activeElement.nodeName ? activeElement : null;
} catch (e) {
return null;
}
};
/**
* Gives the current devicePixelRatio.
*
* By default, this is the value of window.devicePixelRatio (which should be
* preferred if present).
*
* If window.devicePixelRatio is not present, the ratio is calculated with
* window.matchMedia, if present. Otherwise, gives 1.0.
*
* Some browsers (including Chrome) consider the browser zoom level in the pixel
* ratio, so the value may change across multiple calls.
*
* @return {number} The number of actual pixels per virtual pixel.
*/
goog.dom.getPixelRatio = function() {
'use strict';
var win = goog.dom.getWindow();
if (win.devicePixelRatio !== undefined) {
return win.devicePixelRatio;
} else if (win.matchMedia) {
// Should be for IE10 and FF6-17 (this basically clamps to lower)
// Note that the order of these statements is important
return goog.dom.matchesPixelRatio_(3) || goog.dom.matchesPixelRatio_(2) ||
goog.dom.matchesPixelRatio_(1.5) || goog.dom.matchesPixelRatio_(1) ||
.75;
}
return 1;
};
/**
* Calculates a mediaQuery to check if the current device supports the
* given actual to virtual pixel ratio.
* @param {number} pixelRatio The ratio of actual pixels to virtual pixels.
* @return {number} pixelRatio if applicable, otherwise 0.
* @private
*/
goog.dom.matchesPixelRatio_ = function(pixelRatio) {
'use strict';
var win = goog.dom.getWindow();
/**
* Due to the 1:96 fixed ratio of CSS in to CSS px, 1dppx is equivalent to
* 96dpi.
* @const {number}
*/
var dpiPerDppx = 96;
var query =
// FF16-17
'(min-resolution: ' + pixelRatio + 'dppx),' +
// FF6-15
'(min--moz-device-pixel-ratio: ' + pixelRatio + '),' +
// IE10 (this works for the two browsers above too but I don't want to
// trust the 1:96 fixed ratio magic)
'(min-resolution: ' + (pixelRatio * dpiPerDppx) + 'dpi)';
return win.matchMedia(query).matches ? pixelRatio : 0;
};
/**
* Gets '2d' context of a canvas. Shortcut for canvas.getContext('2d') with a
* type information.
* @param {!HTMLCanvasElement|!OffscreenCanvas} canvas
* @return {!CanvasRenderingContext2D}
*/
goog.dom.getCanvasContext2D = function(canvas) {
'use strict';
return /** @type {!CanvasRenderingContext2D} */ (canvas.getContext('2d'));
};
/**
* Create an instance of a DOM helper with a new document object.
* @param {Document=} opt_document Document object to associate with this
* DOM helper.
* @constructor
*/
goog.dom.DomHelper = function(opt_document) {
'use strict';
/**
* Reference to the document object to use
* @type {!Document}
* @private
*/
this.document_ = opt_document || goog.global.document || document;
};
/**
* Gets the dom helper object for the document where the element resides.
* @param {Node=} opt_node If present, gets the DomHelper for this node.
* @return {!goog.dom.DomHelper} The DomHelper.
*/
goog.dom.DomHelper.prototype.getDomHelper = goog.dom.getDomHelper;
/**
* Sets the document object.
* @param {!Document} document Document object.
*/
goog.dom.DomHelper.prototype.setDocument = function(document) {
'use strict';
this.document_ = document;
};
/**
* Gets the document object being used by the dom library.
* @return {!Document} Document object.
*/
goog.dom.DomHelper.prototype.getDocument = function() {
'use strict';
return this.document_;
};
/**
* Alias for `getElementById`. If a DOM node is passed in then we just
* return that.
* @param {string|Element} element Element ID or a DOM node.
* @return {Element} The element with the given ID, or the node passed in.
*/
goog.dom.DomHelper.prototype.getElement = function(element) {
'use strict';
return goog.dom.getElementHelper_(this.document_, element);
};
/**
* Gets an element by id, asserting that the element is found.
*
* This is used when an element is expected to exist, and should fail with
* an assertion error if it does not (if assertions are enabled).
*
* @param {string} id Element ID.
* @return {!Element} The element with the given ID, if it exists.
*/
goog.dom.DomHelper.prototype.getRequiredElement = function(id) {
'use strict';
return goog.dom.getRequiredElementHelper_(this.document_, id);
};
/**
* Alias for `getElement`.
* @param {string|Element} element Element ID or a DOM node.
* @return {Element} The element with the given ID, or the node passed in.
* @deprecated Use {@link goog.dom.DomHelper.prototype.getElement} instead.
*/
goog.dom.DomHelper.prototype.$ = goog.dom.DomHelper.prototype.getElement;
/**
* Gets elements by tag name.
* @param {!goog.dom.TagName<T>} tagName
* @param {(!Document|!Element)=} opt_parent Parent element or document where to
* look for elements. Defaults to document of this DomHelper.
* @return {!NodeList<R>} List of elements. The members of the list are
* {!Element} if tagName is not a member of goog.dom.TagName or more
* specific types if it is (e.g. {!HTMLAnchorElement} for
* goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.DomHelper.prototype.getElementsByTagName = function(
tagName, opt_parent) {
'use strict';
var parent = opt_parent || this.document_;
return parent.getElementsByTagName(String(tagName));
};
/**
* Looks up elements by both tag and class name, using browser native functions
* (`querySelectorAll`, `getElementsByTagName` or
* `getElementsByClassName`) where possible. The returned array is a live
* NodeList or a static list depending on the code path taken.
*
* @param {(string|?goog.dom.TagName<T>)=} opt_tag Element tag name or * for all
* tags.
* @param {?string=} opt_class Optional class name.
* @param {(Document|Element)=} opt_el Optional element to look in.
* @return {!IArrayLike<R>} Array-like list of elements (only a length property
* and numerical indices are guaranteed to exist). The members of the array
* are {!Element} if opt_tag is not a member of goog.dom.TagName or more
* specific types if it is (e.g. {!HTMLAnchorElement} for
* goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.DomHelper.prototype.getElementsByTagNameAndClass = function(
opt_tag, opt_class, opt_el) {
'use strict';
return goog.dom.getElementsByTagNameAndClass_(
this.document_, opt_tag, opt_class, opt_el);
};
/**
* Gets the first element matching the tag and the class.
*
* @param {(string|?goog.dom.TagName<T>)=} opt_tag Element tag name.
* @param {?string=} opt_class Optional class name.
* @param {(Document|Element)=} opt_el Optional element to look in.
* @return {?R} Reference to a DOM node. The return type is {?Element} if
* tagName is a string or a more specific type if it is a member of
* goog.dom.TagName (e.g. {?HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.DomHelper.prototype.getElementByTagNameAndClass = function(
opt_tag, opt_class, opt_el) {
'use strict';
return goog.dom.getElementByTagNameAndClass_(
this.document_, opt_tag, opt_class, opt_el);
};
/**
* Returns an array of all the elements with the provided className.
* @param {string} className the name of the class to look for.
* @param {Element|Document=} opt_el Optional element to look in.
* @return {!IArrayLike<!Element>} The items found with the class name provided.
*/
goog.dom.DomHelper.prototype.getElementsByClass = function(className, opt_el) {
'use strict';
var doc = opt_el || this.document_;
return goog.dom.getElementsByClass(className, doc);
};
/**
* Returns the first element we find matching the provided class name.
* @param {string} className the name of the class to look for.
* @param {(Element|Document)=} opt_el Optional element to look in.
* @return {Element} The first item found with the class name provided.
*/
goog.dom.DomHelper.prototype.getElementByClass = function(className, opt_el) {
'use strict';
var doc = opt_el || this.document_;
return goog.dom.getElementByClass(className, doc);
};
/**
* Ensures an element with the given className exists, and then returns the
* first element with the provided className.
* @param {string} className the name of the class to look for.
* @param {(!Element|!Document)=} opt_root Optional element or document to look
* in.
* @return {!Element} The first item found with the class name provided.
* @throws {goog.asserts.AssertionError} Thrown if no element is found.
*/
goog.dom.DomHelper.prototype.getRequiredElementByClass = function(
className, opt_root) {
'use strict';
var root = opt_root || this.document_;
return goog.dom.getRequiredElementByClass(className, root);
};
/**
* Alias for `getElementsByTagNameAndClass`.
* @deprecated Use DomHelper getElementsByTagNameAndClass.
*
* @param {(string|?goog.dom.TagName<T>)=} opt_tag Element tag name.
* @param {?string=} opt_class Optional class name.
* @param {Element=} opt_el Optional element to look in.
* @return {!IArrayLike<R>} Array-like list of elements (only a length property
* and numerical indices are guaranteed to exist). The members of the array
* are {!Element} if opt_tag is a string or more specific types if it is
* a member of goog.dom.TagName (e.g. {!HTMLAnchorElement} for
* goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.DomHelper.prototype.$$ =
goog.dom.DomHelper.prototype.getElementsByTagNameAndClass;
/**
* Sets a number of properties on a node.
* @param {Element} element DOM node to set properties on.
* @param {Object} properties Hash of property:value pairs.
*/
goog.dom.DomHelper.prototype.setProperties = goog.dom.setProperties;
/**
* Gets the dimensions of the viewport.
* @param {Window=} opt_window Optional window element to test. Defaults to
* the window of the Dom Helper.
* @return {!goog.math.Size} Object with values 'width' and 'height'.
*/
goog.dom.DomHelper.prototype.getViewportSize = function(opt_window) {
'use strict';
// TODO(arv): This should not take an argument. That breaks the rule of a
// a DomHelper representing a single frame/window/document.
return goog.dom.getViewportSize(opt_window || this.getWindow());
};
/**
* Calculates the height of the document.
*
* @return {number} The height of the document.
*/
goog.dom.DomHelper.prototype.getDocumentHeight = function() {
'use strict';
return goog.dom.getDocumentHeight_(this.getWindow());
};
/**
* Typedef for use with goog.dom.createDom and goog.dom.append.
* @typedef {Object|string|Array|NodeList}
*/
goog.dom.Appendable;
/**
* Returns a dom node with a set of attributes. This function accepts varargs
* for subsequent nodes to be added. Subsequent nodes will be added to the
* first node as childNodes.
*
* So:
* <code>createDom(goog.dom.TagName.DIV, null, createDom(goog.dom.TagName.P),
* createDom(goog.dom.TagName.P));</code> would return a div with two child
* paragraphs
*
* An easy way to move all child nodes of an existing element to a new parent
* element is:
* <code>createDom(goog.dom.TagName.DIV, null, oldElement.childNodes);</code>
* which will remove all child nodes from the old element and add them as
* child nodes of the new DIV.
*
* @param {string|!goog.dom.TagName<T>} tagName Tag to create.
* @param {?Object|?Array<string>|string=} opt_attributes If object, then a map
* of name-value pairs for attributes. If a string, then this is the
* className of the new element. If an array, the elements will be joined
* together as the className of the new element.
* @param {...(goog.dom.Appendable|undefined)} var_args Further DOM nodes or
* strings for text nodes. If one of the var_args is an array or
* NodeList, its elements will be added as childNodes instead.
* @return {R} Reference to a DOM node. The return type is {!Element} if tagName
* is a string or a more specific type if it is a member of
* goog.dom.TagName (e.g. {!HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.DomHelper.prototype.createDom = function(
tagName, opt_attributes, var_args) {
'use strict';
return goog.dom.createDom_(this.document_, arguments);
};
/**
* Alias for `createDom`.
* @param {string|!goog.dom.TagName<T>} tagName Tag to create.
* @param {?Object|?Array<string>|string=} opt_attributes If object, then a map
* of name-value pairs for attributes. If a string, then this is the
* className of the new element. If an array, the elements will be joined
* together as the className of the new element.
* @param {...(goog.dom.Appendable|undefined)} var_args Further DOM nodes or
* strings for text nodes. If one of the var_args is an array, its children
* will be added as childNodes instead.
* @return {R} Reference to a DOM node. The return type is {!Element} if tagName
* is a string or a more specific type if it is a member of
* goog.dom.TagName (e.g. {!HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
* @deprecated Use {@link goog.dom.DomHelper.prototype.createDom} instead.
*/
goog.dom.DomHelper.prototype.$dom = goog.dom.DomHelper.prototype.createDom;
/**
* Creates a new element.
* @param {string|!goog.dom.TagName<T>} name Tag to create.
* @return {R} The new element. The return type is {!Element} if name is
* a string or a more specific type if it is a member of goog.dom.TagName
* (e.g. {!HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.DomHelper.prototype.createElement = function(name) {
'use strict';
return goog.dom.createElement_(this.document_, name);
};
/**
* Creates a new text node.
* @param {number|string} content Content.
* @return {!Text} The new text node.
*/
goog.dom.DomHelper.prototype.createTextNode = function(content) {
'use strict';
return this.document_.createTextNode(String(content));
};
/**
* Create a table.
* @param {number} rows The number of rows in the table. Must be >= 1.
* @param {number} columns The number of columns in the table. Must be >= 1.
* @param {boolean=} opt_fillWithNbsp If true, fills table entries with
* `goog.string.Unicode.NBSP` characters.
* @return {!HTMLElement} The created table.
*/
goog.dom.DomHelper.prototype.createTable = function(
rows, columns, opt_fillWithNbsp) {
'use strict';
return goog.dom.createTable_(
this.document_, rows, columns, !!opt_fillWithNbsp);
};
/**
* Converts an HTML into a node or a document fragment. A single Node is used if
* `html` only generates a single node. If `html` generates multiple
* nodes then these are put inside a `DocumentFragment`. This is a safe
* version of `goog.dom.DomHelper#htmlToDocumentFragment` which is now
* deleted.
* @param {!goog.html.SafeHtml} html The HTML markup to convert.
* @return {!Node} The resulting node.
*/
goog.dom.DomHelper.prototype.safeHtmlToNode = function(html) {
'use strict';
return goog.dom.safeHtmlToNode_(this.document_, html);
};
/**
* Returns true if the browser is in "CSS1-compatible" (standards-compliant)
* mode, false otherwise.
* @return {boolean} True if in CSS1-compatible mode.
*/
goog.dom.DomHelper.prototype.isCss1CompatMode = function() {
'use strict';
return goog.dom.isCss1CompatMode_(this.document_);
};
/**
* Gets the window object associated with the document.
* @return {!Window} The window associated with the given document.
*/
goog.dom.DomHelper.prototype.getWindow = function() {
'use strict';
return goog.dom.getWindow_(this.document_);
};
/**
* Gets the document scroll element.
* @return {!Element} Scrolling element.
*/
goog.dom.DomHelper.prototype.getDocumentScrollElement = function() {
'use strict';
return goog.dom.getDocumentScrollElement_(this.document_);
};
/**
* Gets the document scroll distance as a coordinate object.
* @return {!goog.math.Coordinate} Object with properties 'x' and 'y'.
*/
goog.dom.DomHelper.prototype.getDocumentScroll = function() {
'use strict';
return goog.dom.getDocumentScroll_(this.document_);
};
/**
* Determines the active element in the given document.
* @param {Document=} opt_doc The document to look in.
* @return {Element} The active element.
*/
goog.dom.DomHelper.prototype.getActiveElement = function(opt_doc) {
'use strict';
return goog.dom.getActiveElement(opt_doc || this.document_);
};
/**
* Appends a child to a node.
* @param {Node} parent Parent.
* @param {Node} child Child.
*/
goog.dom.DomHelper.prototype.appendChild = goog.dom.appendChild;
/**
* Appends a node with text or other nodes.
* @param {!Node} parent The node to append nodes to.
* @param {...goog.dom.Appendable} var_args The things to append to the node.
* If this is a Node it is appended as is.
* If this is a string then a text node is appended.
* If this is an array like object then fields 0 to length - 1 are appended.
*/
goog.dom.DomHelper.prototype.append = goog.dom.append;
/**
* Determines if the given node can contain children, intended to be used for
* HTML generation.
*
* @param {Node} node The node to check.
* @return {boolean} Whether the node can contain children.
*/
goog.dom.DomHelper.prototype.canHaveChildren = goog.dom.canHaveChildren;
/**
* Removes all the child nodes on a DOM node.
* @param {Node} node Node to remove children from.
*/
goog.dom.DomHelper.prototype.removeChildren = goog.dom.removeChildren;
/**
* Inserts a new node before an existing reference node (i.e., as the previous
* sibling). If the reference node has no parent, then does nothing.
* @param {Node} newNode Node to insert.
* @param {Node} refNode Reference node to insert before.
*/
goog.dom.DomHelper.prototype.insertSiblingBefore = goog.dom.insertSiblingBefore;
/**
* Inserts a new node after an existing reference node (i.e., as the next
* sibling). If the reference node has no parent, then does nothing.
* @param {Node} newNode Node to insert.
* @param {Node} refNode Reference node to insert after.
*/
goog.dom.DomHelper.prototype.insertSiblingAfter = goog.dom.insertSiblingAfter;
/**
* Insert a child at a given index. If index is larger than the number of child
* nodes that the parent currently has, the node is inserted as the last child
* node.
* @param {Element} parent The element into which to insert the child.
* @param {Node} child The element to insert.
* @param {number} index The index at which to insert the new child node. Must
* not be negative.
*/
goog.dom.DomHelper.prototype.insertChildAt = goog.dom.insertChildAt;
/**
* Removes a node from its parent.
* @param {Node} node The node to remove.
* @return {Node} The node removed if removed; else, null.
*/
goog.dom.DomHelper.prototype.removeNode = goog.dom.removeNode;
/**
* Replaces a node in the DOM tree. Will do nothing if `oldNode` has no
* parent.
* @param {Node} newNode Node to insert.
* @param {Node} oldNode Node to replace.
*/
goog.dom.DomHelper.prototype.replaceNode = goog.dom.replaceNode;
/**
* Replaces child nodes of `target` with child nodes of `source`. This is
* roughly equivalent to `target.innerHTML = source.innerHTML` which is not
* compatible with Trusted Types.
* @param {?Node} target Node to clean and replace its children.
* @param {?Node} source Node to get the children from. The nodes will be cloned
* so they will stay in source.
*/
goog.dom.DomHelper.prototype.copyContents = goog.dom.copyContents;
/**
* Flattens an element. That is, removes it and replace it with its children.
* @param {Element} element The element to flatten.
* @return {Element|undefined} The original element, detached from the document
* tree, sans children, or undefined if the element was already not in the
* document.
*/
goog.dom.DomHelper.prototype.flattenElement = goog.dom.flattenElement;
/**
* Returns an array containing just the element children of the given element.
* @param {Element} element The element whose element children we want.
* @return {!(Array<!Element>|NodeList<!Element>)} An array or array-like list
* of just the element children of the given element.
*/
goog.dom.DomHelper.prototype.getChildren = goog.dom.getChildren;
/**
* Returns the first child node that is an element.
* @param {Node} node The node to get the first child element of.
* @return {Element} The first child node of `node` that is an element.
*/
goog.dom.DomHelper.prototype.getFirstElementChild =
goog.dom.getFirstElementChild;
/**
* Returns the last child node that is an element.
* @param {Node} node The node to get the last child element of.
* @return {Element} The last child node of `node` that is an element.
*/
goog.dom.DomHelper.prototype.getLastElementChild = goog.dom.getLastElementChild;
/**
* Returns the first next sibling that is an element.
* @param {Node} node The node to get the next sibling element of.
* @return {Element} The next sibling of `node` that is an element.
*/
goog.dom.DomHelper.prototype.getNextElementSibling =
goog.dom.getNextElementSibling;
/**
* Returns the first previous sibling that is an element.
* @param {Node} node The node to get the previous sibling element of.
* @return {Element} The first previous sibling of `node` that is
* an element.
*/
goog.dom.DomHelper.prototype.getPreviousElementSibling =
goog.dom.getPreviousElementSibling;
/**
* Returns the next node in source order from the given node.
* @param {Node} node The node.
* @return {Node} The next node in the DOM tree, or null if this was the last
* node.
*/
goog.dom.DomHelper.prototype.getNextNode = goog.dom.getNextNode;
/**
* Returns the previous node in source order from the given node.
* @param {Node} node The node.
* @return {Node} The previous node in the DOM tree, or null if this was the
* first node.
*/
goog.dom.DomHelper.prototype.getPreviousNode = goog.dom.getPreviousNode;
/**
* Whether the object looks like a DOM node.
* @param {?} obj The object being tested for node likeness.
* @return {boolean} Whether the object looks like a DOM node.
*/
goog.dom.DomHelper.prototype.isNodeLike = goog.dom.isNodeLike;
/**
* Whether the object looks like an Element.
* @param {?} obj The object being tested for Element likeness.
* @return {boolean} Whether the object looks like an Element.
*/
goog.dom.DomHelper.prototype.isElement = goog.dom.isElement;
/**
* Returns true if the specified value is a Window object. This includes the
* global window for HTML pages, and iframe windows.
* @param {?} obj Variable to test.
* @return {boolean} Whether the variable is a window.
*/
goog.dom.DomHelper.prototype.isWindow = goog.dom.isWindow;
/**
* Returns an element's parent, if it's an Element.
* @param {Element} element The DOM element.
* @return {Element} The parent, or null if not an Element.
*/
goog.dom.DomHelper.prototype.getParentElement = goog.dom.getParentElement;
/**
* Whether a node contains another node.
* @param {Node} parent The node that should contain the other node.
* @param {Node} descendant The node to test presence of.
* @return {boolean} Whether the parent node contains the descendant node.
*/
goog.dom.DomHelper.prototype.contains = goog.dom.contains;
/**
* Compares the document order of two nodes, returning 0 if they are the same
* node, a negative number if node1 is before node2, and a positive number if
* node2 is before node1. Note that we compare the order the tags appear in the
* document so in the tree <b><i>text</i></b> the B node is considered to be
* before the I node.
*
* @param {Node} node1 The first node to compare.
* @param {Node} node2 The second node to compare.
* @return {number} 0 if the nodes are the same node, a negative number if node1
* is before node2, and a positive number if node2 is before node1.
*/
goog.dom.DomHelper.prototype.compareNodeOrder = goog.dom.compareNodeOrder;
/**
* Find the deepest common ancestor of the given nodes.
* @param {...Node} var_args The nodes to find a common ancestor of.
* @return {Node} The common ancestor of the nodes, or null if there is none.
* null will only be returned if two or more of the nodes are from different
* documents.
*/
goog.dom.DomHelper.prototype.findCommonAncestor = goog.dom.findCommonAncestor;
/**
* Returns the owner document for a node.
* @param {Node} node The node to get the document for.
* @return {!Document} The document owning the node.
*/
goog.dom.DomHelper.prototype.getOwnerDocument = goog.dom.getOwnerDocument;
/**
* Cross browser function for getting the document element of an iframe.
* @param {Element} iframe Iframe element.
* @return {!Document} The frame content document.
*/
goog.dom.DomHelper.prototype.getFrameContentDocument =
goog.dom.getFrameContentDocument;
/**
* Cross browser function for getting the window of a frame or iframe.
* @param {Element} frame Frame element.
* @return {Window} The window associated with the given frame.
*/
goog.dom.DomHelper.prototype.getFrameContentWindow =
goog.dom.getFrameContentWindow;
/**
* Sets the text content of a node, with cross-browser support.
* @param {Node} node The node to change the text content of.
* @param {string|number} text The value that should replace the node's content.
*/
goog.dom.DomHelper.prototype.setTextContent = goog.dom.setTextContent;
/**
* Gets the outerHTML of a node, which islike innerHTML, except that it
* actually contains the HTML of the node itself.
* @param {Element} element The element to get the HTML of.
* @return {string} The outerHTML of the given element.
*/
goog.dom.DomHelper.prototype.getOuterHtml = goog.dom.getOuterHtml;
/**
* Finds the first descendant node that matches the filter function. This does
* a depth first search.
* @param {Node} root The root of the tree to search.
* @param {function(Node) : boolean} p The filter function.
* @return {Node|undefined} The found node or undefined if none is found.
*/
goog.dom.DomHelper.prototype.findNode = goog.dom.findNode;
/**
* Finds all the descendant nodes that matches the filter function. This does a
* depth first search.
* @param {Node} root The root of the tree to search.
* @param {function(Node) : boolean} p The filter function.
* @return {Array<Node>} The found nodes or an empty array if none are found.
*/
goog.dom.DomHelper.prototype.findNodes = goog.dom.findNodes;
/**
* Returns true if the element has a tab index that allows it to receive
* keyboard focus (tabIndex >= 0), false otherwise. Note that some elements
* natively support keyboard focus, even if they have no tab index.
* @param {!Element} element Element to check.
* @return {boolean} Whether the element has a tab index that allows keyboard
* focus.
*/
goog.dom.DomHelper.prototype.isFocusableTabIndex = goog.dom.isFocusableTabIndex;
/**
* Enables or disables keyboard focus support on the element via its tab index.
* Only elements for which {@link goog.dom.isFocusableTabIndex} returns true
* (or elements that natively support keyboard focus, like form elements) can
* receive keyboard focus. See http://go/tabindex for more info.
* @param {Element} element Element whose tab index is to be changed.
* @param {boolean} enable Whether to set or remove a tab index on the element
* that supports keyboard focus.
*/
goog.dom.DomHelper.prototype.setFocusableTabIndex =
goog.dom.setFocusableTabIndex;
/**
* Returns true if the element can be focused, i.e. it has a tab index that
* allows it to receive keyboard focus (tabIndex >= 0), or it is an element
* that natively supports keyboard focus.
* @param {!Element} element Element to check.
* @return {boolean} Whether the element allows keyboard focus.
*/
goog.dom.DomHelper.prototype.isFocusable = goog.dom.isFocusable;
/**
* Returns the text contents of the current node, without markup. New lines are
* stripped and whitespace is collapsed, such that each character would be
* visible.
*
* In browsers that support it, innerText is used. Other browsers attempt to
* simulate it via node traversal. Line breaks are canonicalized in IE.
*
* @param {Node} node The node from which we are getting content.
* @return {string} The text content.
*/
goog.dom.DomHelper.prototype.getTextContent = goog.dom.getTextContent;
/**
* Returns the text length of the text contained in a node, without markup. This
* is equivalent to the selection length if the node was selected, or the number
* of cursor movements to traverse the node. Images & BRs take one space. New
* lines are ignored.
*
* @param {Node} node The node whose text content length is being calculated.
* @return {number} The length of `node`'s text content.
*/
goog.dom.DomHelper.prototype.getNodeTextLength = goog.dom.getNodeTextLength;
/**
* Returns the text offset of a node relative to one of its ancestors. The text
* length is the same as the length calculated by
* `goog.dom.getNodeTextLength`.
*
* @param {Node} node The node whose offset is being calculated.
* @param {Node=} opt_offsetParent Defaults to the node's owner document's body.
* @return {number} The text offset.
*/
goog.dom.DomHelper.prototype.getNodeTextOffset = goog.dom.getNodeTextOffset;
/**
* Returns the node at a given offset in a parent node. If an object is
* provided for the optional third parameter, the node and the remainder of the
* offset will stored as properties of this object.
* @param {Node} parent The parent node.
* @param {number} offset The offset into the parent node.
* @param {Object=} opt_result Object to be used to store the return value. The
* return value will be stored in the form {node: Node, remainder: number}
* if this object is provided.
* @return {Node} The node at the given offset.
*/
goog.dom.DomHelper.prototype.getNodeAtOffset = goog.dom.getNodeAtOffset;
/**
* Returns true if the object is a `NodeList`. To qualify as a NodeList,
* the object must have a numeric length property and an item function (which
* has type 'string' on IE for some reason).
* @param {Object} val Object to test.
* @return {boolean} Whether the object is a NodeList.
*/
goog.dom.DomHelper.prototype.isNodeList = goog.dom.isNodeList;
/**
* Walks up the DOM hierarchy returning the first ancestor that has the passed
* tag name and/or class name. If the passed element matches the specified
* criteria, the element itself is returned.
* @param {Node} element The DOM node to start with.
* @param {?(goog.dom.TagName<T>|string)=} opt_tag The tag name to match (or
* null/undefined to match only based on class name).
* @param {?string=} opt_class The class name to match (or null/undefined to
* match only based on tag name).
* @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
* dom.
* @return {?R} The first ancestor that matches the passed criteria, or
* null if no match is found. The return type is {?Element} if opt_tag is
* not a member of goog.dom.TagName or a more specific type if it is (e.g.
* {?HTMLAnchorElement} for goog.dom.TagName.A).
* @template T
* @template R := cond(isUnknown(T), 'Element', T) =:
*/
goog.dom.DomHelper.prototype.getAncestorByTagNameAndClass =
goog.dom.getAncestorByTagNameAndClass;
/**
* Walks up the DOM hierarchy returning the first ancestor that has the passed
* class name. If the passed element matches the specified criteria, the
* element itself is returned.
* @param {Node} element The DOM node to start with.
* @param {string} class The class name to match.
* @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
* dom.
* @return {Element} The first ancestor that matches the passed criteria, or
* null if none match.
*/
goog.dom.DomHelper.prototype.getAncestorByClass = goog.dom.getAncestorByClass;
/**
* Walks up the DOM hierarchy returning the first ancestor that passes the
* matcher function.
* @param {Node} element The DOM node to start with.
* @param {function(Node) : boolean} matcher A function that returns true if the
* passed node matches the desired criteria.
* @param {boolean=} opt_includeNode If true, the node itself is included in
* the search (the first call to the matcher will pass startElement as
* the node to test).
* @param {number=} opt_maxSearchSteps Maximum number of levels to search up the
* dom.
* @return {Node} DOM node that matched the matcher, or null if there was
* no match.
*/
goog.dom.DomHelper.prototype.getAncestor = goog.dom.getAncestor;
/**
* Gets '2d' context of a canvas. Shortcut for canvas.getContext('2d') with a
* type information.
* @param {!HTMLCanvasElement} canvas
* @return {!CanvasRenderingContext2D}
*/
goog.dom.DomHelper.prototype.getCanvasContext2D = goog.dom.getCanvasContext2D;
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