textarea-selection-preservation.html

<html>
<head>
<script src="../../../resources/js-test.js"></script>
</head>
<body>
<p>This tests for problems where we'd lose the selection in a textarea when making style and value changes.</p>
<div id="console"></div>
<form id="form"><textarea id="ta">abc123
</textarea></form>
<script type="text/javascript">
    var ta = document.getElementById('ta');
    debug("- default value");
    shouldBe('ta.selectionStart', '0');
    shouldBe('ta.selectionEnd', '0');
    debug("- set selectionStart/End");
    ta.selectionStart = 3;
    ta.selectionEnd = 4;
    shouldBe('ta.selectionStart', '3');
    shouldBe('ta.selectionEnd', '4');
    debug("- add background style");
    ta.setAttribute("style", "background-color: yellow");
    shouldBe('ta.selectionStart', '3');
    shouldBe('ta.selectionEnd', '4');
    debug("- set value to same value");
    ta.value = "abc123\n";
    shouldBe('ta.selectionStart', '3');
    shouldBe('ta.selectionEnd', '4');
    debug("- set value to a different value");
    ta.value = "abc123";
    shouldBe('ta.selectionStart', '6');
    shouldBe('ta.selectionEnd', '6');
    debug("- set selection so we can test again without a trailing newline");
    ta.selectionStart = 3;
    ta.selectionEnd = 4;
    ta.removeAttribute("style");
    shouldBe('ta.selectionStart', '3');
    shouldBe('ta.selectionEnd', '4');
    debug("- add background style");
    ta.setAttribute("style", "background-color: yellow");
    shouldBe('ta.selectionStart', '3');
    shouldBe('ta.selectionEnd', '4');
    debug("- set value to same value");
    ta.value = "abc123";
    shouldBe('ta.selectionStart', '3');
    shouldBe('ta.selectionEnd', '4');

    debug("- reset form");
    form.reset();
    shouldBe('ta.selectionStart', '7');
    shouldBe('ta.selectionEnd', '7');

    debug("- append a empty text node");
    ta.setSelectionRange(2, 3);
    ta.appendChild(document.createTextNode(''));
    shouldBe('ta.selectionStart', '2');
    shouldBe('ta.selectionEnd', '3');
</script>
</body>
</html>
chromium/third_party/blink/web_tests/fast/forms/textarea/textarea-selection-preservation.html
