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https://bugzilla.mozilla.org/show_bug.cgi?id=1308069
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-->
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<head>
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<title>Bug 1308069</title>
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<script src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
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</head>
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<body>
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Mozilla Bug 1308069
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<script class="testbody" type="text/javascript">
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function testClearPendingErrorEvent() {
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return new Promise(function(aResolve, aReject) {
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var hasErrorEvent = false;
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var imgTarget = new Image();
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var imgForChangingTargetSrc = new Image();
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// Queue an error event for changing imgTarget's src.
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imgForChangingTargetSrc.src = '';
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imgForChangingTargetSrc.onerror = function() {
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// This clears imgTarget's pending error event.
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imgTarget.src = 'data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="96" height="96"><path d="M10,10L32,90L90,32z" fill="lightgreen"/></svg>';
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// Queue an error event for checking and resolving promise.
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var imgForCheckingAndResolvingPromise = new Image();
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imgForCheckingAndResolvingPromise.src = '';
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imgForCheckingAndResolvingPromise.onerror = function() {
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ok(!hasErrorEvent,
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'Should not receive an error event since the pending error event ' +
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'should be cleared before it fired');
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aResolve();
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};
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};
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// Setting src to empty string queues an error event.
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imgTarget.src = '';
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imgTarget.onerror = function() {
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hasErrorEvent = true;
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};
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});
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}
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function testReplacePendingErrorEvent() {
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return new Promise(function(aResolve) {
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var numOfErrorEvent = 0;
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var imgTarget = new Image();
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var imgForChangingTargetSrc = new Image();
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// Queue an error event for changing imgTarget's src.
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imgForChangingTargetSrc.src = '';
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imgForChangingTargetSrc.onerror = function() {
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// This clears pending error event and fires a new one.
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imgTarget.src = '';
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// Queue an error event for checking and resolving promise.
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var imgForCheckingAndResolvingPromise = new Image();
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imgForCheckingAndResolvingPromise.src = '';
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imgForCheckingAndResolvingPromise.onerror = function() {
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is(numOfErrorEvent, 1,
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'Should only receive one error event since the first pending error ' +
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'event should be cleared before it fired');
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aResolve();
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};
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};
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// Setting src to empty string queues an error event.
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imgTarget.src = '';
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imgTarget.onerror = function() {
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numOfErrorEvent++;
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};
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});
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}
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SimpleTest.waitForExplicitFinish();
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Promise.resolve()
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.then(() => testClearPendingErrorEvent())
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.then(() => testReplacePendingErrorEvent())
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.catch((err) => ok(false, "promise rejected: " + err))
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.then(() => SimpleTest.finish());
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</script>
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</body>
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</html>
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