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<!DOCTYPE html>
<meta charset="utf-8" />
<title>Popover events</title>
<link rel="author" href="mailto:masonf@chromium.org">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/popover-utils.js"></script>
<div popover>Popover</div>
<script>
function getPopoverAndSignal(t) {
const popover = document.querySelector('[popover]');
const controller = new AbortController();
const signal = controller.signal;
t.add_cleanup(() => controller.abort());
return {popover, signal};
}
window.onload = () => {
for(const method of ["listener","attribute"]) {
promise_test(async t => {
const {popover,signal} = getPopoverAndSignal(t);
assert_false(popover.matches(':popover-open'));
let showCount = 0;
let afterShowCount = 0;
let hideCount = 0;
let afterHideCount = 0;
function listener(e) {
assert_false(e.bubbles,'toggle events should not bubble');
if (e.type === "beforetoggle") {
if (e.newState === "open") {
++showCount;
assert_equals(e.oldState,"closed",'The "beforetoggle" event should be fired before the popover is open');
assert_false(e.target.matches(':popover-open'),'The popover should *not* be in the :popover-open state when the opening event fires.');
assert_true(e.cancelable,'beforetoggle should be cancelable only for the "show" transition');
} else {
++hideCount;
assert_equals(e.newState,"closed",'Popover toggleevent states should be "open" and "closed"');
assert_equals(e.oldState,"open",'The "beforetoggle" event should be fired before the popover is closed')
assert_true(e.target.matches(':popover-open'),'The popover should be in the :popover-open state when the hiding event fires.');
assert_false(e.cancelable,'beforetoggle should be cancelable only for the "show" transition');
e.preventDefault(); // beforetoggle should be cancelable only for the "show" transition
}
} else {
assert_equals(e.type,"toggle",'Popover events should be "beforetoggle" and "toggle"')
assert_false(e.cancelable,'toggle should never be cancelable');
e.preventDefault(); // toggle should never be cancelable
if (e.newState === "open") {
++afterShowCount;
if (document.body.contains(e.target)) {
assert_true(e.target.matches(':popover-open'),'The popover should be in the :popover-open state when the after opening event fires.');
}
} else {
++afterHideCount;
assert_equals(e.newState,"closed",'Popover toggleevent states should be "open" and "closed"');
assert_false(e.target.matches(':popover-open'),'The popover should *not* be in the :popover-open state when the after hiding event fires.');
}
e.preventDefault(); // "toggle" should not be cancelable.
}
};
switch (method) {
case "listener":
// These events do *not* bubble.
popover.addEventListener('beforetoggle', listener, {signal});
popover.addEventListener('toggle', listener, {signal});
break;
case "attribute":
assert_false(popover.hasAttribute('onbeforetoggle'));
t.add_cleanup(() => popover.removeAttribute('onbeforetoggle'));
popover.onbeforetoggle = listener;
assert_false(popover.hasAttribute('ontoggle'));
t.add_cleanup(() => popover.removeAttribute('ontoggle'));
popover.ontoggle = listener;
break;
default: assert_unreached();
}
assert_equals(0,showCount);
assert_equals(0,hideCount);
assert_equals(0,afterShowCount);
assert_equals(0,afterHideCount);
popover.showPopover();
assert_true(popover.matches(':popover-open'));
assert_equals(1,showCount);
assert_equals(0,hideCount);
assert_equals(0,afterShowCount);
assert_equals(0,afterHideCount);
await waitForRender();
assert_equals(1,afterShowCount,'toggle show is fired asynchronously');
assert_equals(0,afterHideCount);
assert_true(popover.matches(':popover-open'));
popover.hidePopover();
assert_false(popover.matches(':popover-open'));
assert_equals(1,showCount);
assert_equals(1,hideCount);
assert_equals(1,afterShowCount);
assert_equals(0,afterHideCount);
await waitForRender();
assert_equals(1,afterShowCount);
assert_equals(1,afterHideCount,'toggle hide is fired asynchronously');
// No additional events
await waitForRender();
await waitForRender();
assert_false(popover.matches(':popover-open'));
assert_equals(1,showCount);
assert_equals(1,hideCount);
assert_equals(1,afterShowCount);
assert_equals(1,afterHideCount);
}, `The "beforetoggle" event (${method}) get properly dispatched for popovers`);
}
promise_test(async t => {
const {popover,signal} = getPopoverAndSignal(t);
let cancel = true;
popover.addEventListener('beforetoggle',(e) => {
if (e.newState !== "open")
return;
if (cancel)
e.preventDefault();
}, {signal});
assert_false(popover.matches(':popover-open'));
popover.showPopover();
assert_false(popover.matches(':popover-open'),'The "beforetoggle" event should be cancelable for the "opening" transition');
cancel = false;
popover.showPopover();
assert_true(popover.matches(':popover-open'));
popover.hidePopover();
assert_false(popover.matches(':popover-open'));
}, 'The "beforetoggle" event is cancelable for the "opening" transition');
promise_test(async t => {
const {popover,signal} = getPopoverAndSignal(t);
popover.addEventListener('beforetoggle',(e) => {
assert_not_equals(e.newState,"closed",'The "beforetoggle" event was fired for the closing transition');
}, {signal});
assert_false(popover.matches(':popover-open'));
popover.showPopover();
assert_true(popover.matches(':popover-open'));
t.add_cleanup(() => {document.body.appendChild(popover);});
popover.remove();
await waitForRender(); // Check for async events also
await waitForRender(); // Check for async events also
assert_false(popover.matches(':popover-open'));
}, 'The "beforetoggle" event is not fired for element removal');
promise_test(async t => {
const {popover,signal} = getPopoverAndSignal(t);
let events;
function resetEvents() {
events = {
singleShow: false,
singleHide: false,
coalescedShow: false,
coalescedHide: false,
};
}
function setEvent(type) {
assert_equals(events[type],false,'event repeated');
events[type] = true;
}
function assertOnly(type,msg) {
Object.keys(events).forEach(val => {
assert_equals(events[val],val===type,`${msg} (${val})`);
});
}
popover.addEventListener('toggle',(e) => {
switch (e.newState) {
case "open":
switch (e.oldState) {
case "open": setEvent('coalescedShow'); break;
case "closed": setEvent('singleShow'); break;
default: assert_unreached();
}
break;
case "closed":
switch (e.oldState) {
case "closed": setEvent('coalescedHide'); break;
case "open": setEvent('singleHide'); break;
default: assert_unreached();
}
break;
default: assert_unreached();
}
}, {signal});
resetEvents();
assertOnly('none');
assert_false(popover.matches(':popover-open'));
popover.showPopover();
await waitForRender();
assert_true(popover.matches(':popover-open'));
assertOnly('singleShow','Single event should have been fired, which is a "show"');
resetEvents();
popover.hidePopover();
popover.showPopover(); // Immediate re-show
await waitForRender();
assert_true(popover.matches(':popover-open'));
assertOnly('coalescedShow','Single coalesced event should have been fired, which is a "show"');
resetEvents();
popover.hidePopover();
await waitForRender();
assertOnly('singleHide','Single event should have been fired, which is a "hide"');
assert_false(popover.matches(':popover-open'));
resetEvents();
popover.showPopover();
popover.hidePopover(); // Immediate re-hide
await waitForRender();
assertOnly('coalescedHide','Single coalesced event should have been fired, which is a "hide"');
assert_false(popover.matches(':popover-open'));
}, 'The "toggle" event is coalesced');
};
</script>
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