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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /navigation-api/per-entry-events/dispose-for-navigation-in-child-entries-updated.html - WPT Dashboard Interop Dashboard
<!doctype html>
<meta charset="utf-8">
<title>Navigation API: entries() and currentEntry must already be updated when dispose fires for entries truncated by a navigation in another frame</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<iframe id="iframe" src="/common/blank.html"></iframe>
<!--
Companion to navigation-api/per-entry-events/dispose-for-navigation-in-child.html,
which only checks that the top frame's forward entries are disposed when a child
frame pushes. This test checks the state that those dispose handlers observe:
per spec the entry list and current entry index are updated *before* the dispose
events fire, so a handler must never see the entry it is being notified about
still in navigation.entries().
-->
<script>
promise_test(async t => {
// Wait for after the load event so that the navigations don't get converted
// into replace navigations.
await new Promise(r => window.onload = () => t.step_timeout(r, 0));
const startLength = navigation.entries().length;
const startIndex = navigation.currentEntry.index;
const childNav = iframe.contentWindow.navigation;
await childNav.navigate("#a").finished;
await navigation.navigate("#1").finished;
await navigation.navigate("#2").finished;
await navigation.navigate("#3").finished;
await childNav.back().finished;
assert_equals(navigation.entries().length, startLength + 3, "top frame keeps its forward entries after the child traverses back");
assert_equals(navigation.currentEntry.index, startIndex, "top frame moved back with the child");
// Snapshot what each dispose handler sees, rather than asserting inside the
// handler, so that a failure reports every handler's view.
const observed = [];
const disposed = [];
for (let i = startIndex + 1; i < navigation.entries().length; i++) {
const entry = navigation.entries()[i];
disposed.push(new Promise(resolve => {
entry.ondispose = e => {
observed.push({
entriesLength: navigation.entries().length,
currentIndex: navigation.currentEntry.index,
targetIndex: e.target.index,
stillInEntries: navigation.entries().indexOf(entry) !== -1,
});
resolve();
};
}));
}
// A push navigation in the child truncates the joint session history, which
// removes the top frame's forward entries even though the top frame is not
// the frame that navigated.
await childNav.navigate("#b").finished;
await Promise.all(disposed);
assert_equals(observed.length, 3, "all three forward entries fired dispose");
observed.forEach((state, i) => {
assert_equals(state.entriesLength, startLength, `dispose ${i}: entries() must already be truncated`);
assert_equals(state.currentIndex, startIndex, `dispose ${i}: currentEntry.index must already be updated`);
assert_false(state.stillInEntries, `dispose ${i}: the disposed entry must already be removed from entries()`);
assert_equals(state.targetIndex, -1, `dispose ${i}: the disposed entry's index must be -1`);
});
}, "Entries truncated by a child frame's push must be removed from entries() before their dispose events fire");
</script>