gecko-dev/dom/xul/test/test_bug1290965.xul

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<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" xmlns:html="http://www.w3.org/1999/xhtml" xmlns:h="http://www.w3.org/1999/xhtml">
<script type="application/javascript"
src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js" />
<toolbarbutton oncommand="++countera;" id="a">A</toolbarbutton>
<toolbarbutton oncommand="++counterb;" id="b">B</toolbarbutton>
<script type="text/javascript">
<![CDATA[
let aEl = document.getElementById('a');
let bEl = document.getElementById('b');
let countera = 0;
let counterb = 0;
aEl.addEventListener('click', function (aEvent) {
aEvent.preventDefault();
let cmdEvent = document.createEvent("xulcommandevent");
cmdEvent.initCommandEvent("command", true, true, window, 0,
aEvent.ctrlKey, aEvent.altKey, aEvent.shiftKey,
aEvent.metaKey, null);
aEvent.currentTarget.dispatchEvent(cmdEvent);
});
bEl.addEventListener('click', function (aEvent) {
let cmdEvent = document.createEvent("xulcommandevent");
cmdEvent.initCommandEvent("command", true, true, window, 0,
aEvent.ctrlKey, aEvent.altKey, aEvent.shiftKey,
aEvent.metaKey, null);
aEvent.currentTarget.dispatchEvent(cmdEvent);
});
bEl.click();
aEl.click();
is(countera, 1, "Counter should be one as event fires once");
is(counterb, 2, "Counter should be two as event fires twice");
]]>
</script>
</window>