change-multiple-preserve-selection.html

<html>
<head>
<script src="../../../resources/js-test.js"></script>
<script>
var selectElement;
function go() {
    // <select multiple="true"> should not have a selection by default.
    selectElement = document.getElementsByTagName('select')[0];
    shouldBe("selectElement.selectedIndex", "-1");

    // Do not preserve non-selected state on conversion to single.
    selectElement.multiple = false;
    shouldBe("selectElement.selectedIndex", "0");

    // <select multiple="false"> should have a selection by default and that
    // selection should be preserved.
    selectElement = document.getElementsByTagName('select')[1];
    selectElement.multiple = true;
    shouldBe("selectElement.selectedIndex", "0");

    // Test the same cases as above but with selects that start out with
    // display: none.
    selectElement = document.getElementsByTagName('select')[2];
    selectElement.style.display = '';
    shouldBe("selectElement.selectedIndex", "-1");
    selectElement.multiple = false;
    shouldBe("selectElement.selectedIndex", "0");

    selectElement = document.getElementsByTagName('select')[3];
    selectElement.style.display = '';
    selectElement.multiple = true;
    shouldBe("selectElement.selectedIndex", "0");

    // Test resetting the multiple attribute.
    selectElement = document.getElementsByTagName('select')[4];
    shouldBe("selectElement.options[0].selected", "true");
    shouldBe("selectElement.options[1].selected", "true");
    shouldBe("selectElement.options[2].selected", "false");
    selectElement.multiple = true;
    shouldBe("selectElement.options[0].selected", "true");
    shouldBe("selectElement.options[1].selected", "true");
    shouldBe("selectElement.options[2].selected", "false");
    selectElement.multiple = false;
    shouldBe("selectElement.options[0].selected", "true");
    shouldBe("selectElement.options[1].selected", "false");
    shouldBe("selectElement.options[2].selected", "false");
}
</script>
<body onload="go()"> 
    <select multiple="true"> 
        <option id="opt1" value="1">1</option> 
        <option id="opt2" value="2">2</option>
        <option id="opt2" value="3">3</option> 
    </select>
    <select> 
        <option id="opt1" value="1">1</option> 
        <option id="opt2" value="2">2</option>
        <option id="opt2" value="3">3</option> 
    </select>
    <select multiple="true" style="display: none;"> 
        <option id="opt1" value="1">1</option> 
        <option id="opt2" value="2">2</option>
        <option id="opt2" value="3">3</option> 
    </select>
    <select style="display: none;"> 
        <option id="opt1" value="1">1</option> 
        <option id="opt2" value="2">2</option>
        <option id="opt2" value="3">3</option> 
    </select>
    <select multiple="true"> 
        <option id="opt1" value="1" selected="selected">1</option> 
        <option id="opt2" value="2" selected="selected">2</option>
        <option id="opt2" value="3">3</option> 
    </select>
    <div id="console"></div>
</body>
</html>
chromium/third_party/blink/web_tests/fast/forms/select/change-multiple-preserve-selection.html
