Event.stopPropagation.html

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<!DOCTYPE HTML>

<html>

    <head>

        <title> W3C DOM Level 3 Event Object method: stopPropagation </title>

        <script type="text/javascript">

            var PassTest = function()

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

            var FailTest = function()

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

            var EVENT = "mousedown";

            var TARGET, PARENT;

            var ActualResult = [];

            var ExpectResult = [];

            window.onload = function()

try

                    TARGET = document.getElementById("target");

                    PARENT = document.getElementById("parent");

                    ExpectResult = [document.body, PARENT];

                    TARGET.addEventListener(EVENT, TestEvent, true);

                    TARGET.addEventListener(EVENT, TestEvent, false);

                    PARENT.addEventListener(EVENT, TestEvent, true);

                    PARENT.addEventListener(EVENT, TestEvent, false);

                    document.body.addEventListener(EVENT, TestEvent, true);

                catch(ex)

                    FailTest();

            function TestEvent(evt)

                ActualResult.push(evt.currentTarget);

                if (evt.currentTarget == PARENT)

try

                        evt.stopPropagation();

                    catch(ex)

            function VerifyTest()

                if (ActualResult.toString() == ExpectResult.toString())

                    PassTest();

                else

                    FailTest();

        </script>

    </head>

    <body>

        <h4>

            Test Description:

            stopPropagation prevents other event listeners from being triggered.

        </h4>

        <div id="parent">

            Click the button: <input id="target" type="button" value="Target" onmouseup="VerifyTest()" />

        </div>

        <p>Test passes if the word "PASS" appears below after clicking the above button using mouse.</p>

           <div>Test result: </div>

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

    </body>

</html>