MouseEvent.preventDefault.html

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<!DOCTYPE html>

<html>

    <head>

        <title id='desc'> MouseEvent: mousedown - preventDefault() for text selection </title>

        <script type="text/javascript">

            var PassTest = function()

                document.getElementById("testresult").firstChild.data = "PASS";

            var FailTest = function()

                document.getElementById("testresult").firstChild.data = "FAIL";

            var EVENT1 = "mousedown";

            var EVENT2 = "mouseup";

            var TARGET;

            var DisableSelection = false;

            var DefaultPrevented = false;

            var BEFORE = 0;

            var AFTER = 0;

            function DisableTextSelection()

                DisableSelection = true;

            function TestEvent(evt)

                if ((true == DisableSelection) && (EVENT1 == evt.type))

                    evt.preventDefault();

                    DefaultPrevented = true;

                    BEFORE = evt.clientX;

                if ((true == DisableSelection) && (EVENT2 == evt.type))

                    AFTER = evt.clientX;

            function VerifyResult()

                var distance = Math.abs(AFTER - BEFORE);

                if ((true == DefaultPrevented) && (10 < distance) && ("" == window.getSelection()))

                    PassTest()

                else

                    FailTest();

            window.onload = function()

try

                    TARGET = document.getElementById("target");

                    TARGET.addEventListener(EVENT1, TestEvent, false);

                    TARGET.addEventListener(EVENT2, TestEvent, false);

                catch(ex)

                    FailTest();

        </script>

    </head>

    <body>

        <h3>DOM Events</h3>

        <h4>

            Test Description: MouseEvent - Text selection is disabled after cancelling mousedown event.

        </h4>

        <span id="target" style="border:1px solid green; color:blue">&nbsp; Use mouse to select the whole line here &nbsp;</span>

        <p id="manualsteps">

            Steps:

            <ol>

                <li> Make sure text in the above green box can be selected using mouse

                <li> Dismiss the selection, if any, by clicking at the green box with mouse

                <li> Now, click the button: <button onclick="DisableTextSelection()">Disable Selection</button>

                <li> Drag mouse to select the whole line of the text inside the above green box

                <li> Click the button: <button id="verify" onclick="VerifyResult()">VerifyResult</button>

            </ol>

        </p>

        <p>Test passes if the word "PASS" appears below after following the above steps.</p>

        <div>Test result: </div>

        <div id='testresult'>FAIL</div>

    </body>

</html>