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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="apz_test_utils.js"></script>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<style>
html, body { margin: 0; }
body {
height: 10000px;
}
#container {
height: 500px;
width: 500px;
overflow: scroll;
}
.spacer {
height: 5000px;
width: 100%;
}
</style>
<script>
const searchParams = new URLSearchParams(location.search);
async function test() {
let scrollendCount = 0;
// When scrollend is fired at the document, the document and
// window event listeners should be fired.
let expectedScrollendCount = 2;
let scrollTarget = document.scrollingElement;
// The scrollend event should not bubble if the target is not Document.
function onElementScrollend(e) {
scrollendCount += 1;
is(e.bubbles, false, "Event bubbles should be false for Element");
}
// The scrollend event should bubble if the target is Document.
function onDocumentScrollend(e) {
scrollendCount += 1;
is(e.bubbles, true, "Event bubbles should be true for Document");
}
function failOnScrollend(e) {
ok(false, e.target + ": should not receive a scrollend event");
}
switch (searchParams.get("scroll-target")) {
case "document":
// The window and the document event listeners should be triggered.
document.addEventListener("scrollend", onDocumentScrollend);
window.addEventListener("scrollend", onDocumentScrollend);
// Fail if the element receives a scrollend event.
container.addEventListener("scrollend", failOnScrollend);
break;
case "element":
scrollTarget = document.getElementById("container");
expectedScrollendCount = 1;
// Only the the element event listener should be triggered.
container.addEventListener("scrollend", onElementScrollend);
// Fail if the document or window receive a scrollend event.
document.addEventListener("scrollend", failOnScrollend);
window.addEventListener("scrollend", failOnScrollend);
break;
default:
ok(false, "Unsupported scroll-target: " + searchParams.get("scroll-target"));
break;
}
// Call the scrollTo function on the target to trigger the scrollend.
scrollTarget.scrollBy({ top: 500, left: 0 });
// Ensure the refresh driver has ticked.
await promiseFrame();
// A scrollend event should be posted after the refresh driver has ticked.
is(scrollendCount, expectedScrollendCount,
"Trigger the expected number of scrollend events");
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
</head>
<body>
<div id="container">
<div class="spacer">
</div>
</div>
</body>
</html>