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<!DOCTYPE html>
<title>Shadow DOM: slotchange Events</title>
<meta name="author" title="Hayato Ito" href="mailto:hayato@google.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/shadow-dom.js"></script>
<div id="test1">
<div id="host1">
<template data-mode="open">
<slot id="s1" name="slot1"></slot>
</template>
<div id="c1" slot="slot1"></div>
</div>
</div>
<script>
function doneIfSlotChange(slots, test) {
let fired = new Set();
for (let slot of slots) {
slot.addEventListener('slotchange', test.step_func((e) => {
assert_false(fired.has(slot.id));
fired.add(slot.id);
if (fired.size == slots.length) {
test.done();
}
}))
}
}
async_test((test) => {
let n = createTestTree(test1);
removeWhiteSpaceOnlyTextNodes(n.test1);
doneIfSlotChange([n.s1], test);
let d1 = document.createElement('div');
d1.setAttribute('slot', 'slot1');
n.host1.appendChild(d1);
}, 'slotchange event: Append a child to a host.');
async_test((test) => {
let n = createTestTree(test1);
removeWhiteSpaceOnlyTextNodes(n.test1);
doneIfSlotChange([n.s1], test);
n.c1.remove();
}, 'slotchange event: Remove a child from a host.');
async_test((test) => {
let n = createTestTree(test1);
removeWhiteSpaceOnlyTextNodes(n.test1);
n.c1.remove();
doneIfSlotChange([n.s1], test);
}, 'slotchange event: Remove a child before adding an event listener.');
async_test((test) => {
let n = createTestTree(test1);
removeWhiteSpaceOnlyTextNodes(n.test1);
doneIfSlotChange([n.s1], test);
n.c1.setAttribute('slot', 'slot-none');
}, 'slotchange event: Change slot= attribute to make it un-assigned.');
async_test((test) => {
let n = createTestTree(test1);
removeWhiteSpaceOnlyTextNodes(n.test1);
doneIfSlotChange([n.s1], test);
n.s1.setAttribute('name', 'slot-none');
}, 'slotchange event: Change slot\'s name= attribute so that none is assigned.');
</script>
<div id="test2">
<div id="host1">
<template data-mode="open">
<slot id="s1" name="slot1"></slot>
</template>
<div id="c2" slot="slot2"></div>
</div>
</div>
<script>
async_test((test) => {
let n = createTestTree(test2);
removeWhiteSpaceOnlyTextNodes(n.test2);
doneIfSlotChange([n.s1], test);
n.c2.setAttribute('slot', 'slot1');
}, 'slotchange event: Change slot= attribute to make it assigned.');
async_test((test) => {
let n = createTestTree(test2);
removeWhiteSpaceOnlyTextNodes(n.test2);
doneIfSlotChange([n.s1], test);
n.s1.setAttribute('name', 'slot2');
}, 'slotchange event: Change slot\'s name= attribute so that a node is assigned to the slot.');
</script>
<div id="test_fallback">
<div id="host1">
<template data-mode="open">
<slot id="s1"></slot>
</template>
</div>
</div>
<script>
async_test((test) => {
let n = createTestTree(test_fallback);
removeWhiteSpaceOnlyTextNodes(n.test_fallback);
doneIfSlotChange([n.s1], test);
n.s1.appendChild(document.createElement('div'));
}, 'slotchange event: Add a fallback content.');
</script>
<div id="test_fallback2">
<div id="host1">
<template data-mode="open">
<slot id="s1">
<div id="f1"></div>
</slot>
</template>
</div>
</div>
<script>
async_test((test) => {
let n = createTestTree(test_fallback2);
removeWhiteSpaceOnlyTextNodes(n.test_fallback2);
doneIfSlotChange([n.s1], test);
n.f1.remove();
}, 'slotchange event: Remove a fallback content.');
</script>
<div id="test_fallback3">
<div id="host1">
<template data-mode="open">
<slot id="s2">
<slot id="s1">
<div id="f1"></div>
</slot>
</slot>
</template>
</div>
</div>
<script>
async_test((test) => {
let n = createTestTree(test_fallback3);
removeWhiteSpaceOnlyTextNodes(n.test_fallback3);
doneIfSlotChange([n.s1, n.s2], test);
n.s1.appendChild(document.createElement('div'));
}, 'slotchange event: Add a fallback content to nested slots.');
async_test((test) => {
let n = createTestTree(test_fallback3);
removeWhiteSpaceOnlyTextNodes(n.test_fallback3);
doneIfSlotChange([n.s1, n.s2], test);
n.f1.remove();
}, 'slotchange event: Remove a fallback content from nested slots.');
</script>
<div id="test3">
<div id="host1">
<template id="shadowroot" data-mode="open">
<slot id="s1" name="slot1"></slot>
</template>
<div id="c1" slot="slot1"></div>
</div>
</div>
<script>
async_test((test) => {
let n = createTestTree(test3);
removeWhiteSpaceOnlyTextNodes(n.test3);
doneIfSlotChange([n.s1], test);
let slot = document.createElement('slot');
slot.setAttribute('name', 'slot1');
n.shadowroot.insertBefore(slot, n.s1);
}, "slotchange event: Insert a slot before an existing slot.");
</script>
<div id="test4">
<div id="host1">
<template id="shadowroot" data-mode="open">
<slot id="s1" name="slot1"></slot>
<slot id="s2" name="slot1"></slot>
</template>
<div id="c1" slot="slot1"></div>
</div>
</div>
<script>
async_test((test) => {
let n = createTestTree(test4);
removeWhiteSpaceOnlyTextNodes(n.test4);
doneIfSlotChange([n.s2], test);
n.s1.remove();
}, "slotchange event: Remove a preceding slot.");
</script>
<div id="test5">
<div id="host1">
<template data-mode="open">
<div id="host2">
<template data-mode="open">
<slot id="s2" name="slot2"></slot>
</template>
<slot id="s1" name="slot1" slot="slot2"></slot>
</div>
</template>
<div id="c1" slot="slot1"></div>
</div>
</div>
<script>
async_test((test) => {
let n = createTestTree(test5);
removeWhiteSpaceOnlyTextNodes(n.test5);
doneIfSlotChange([n.s1, n.s2], test);
n.c1.remove();
}, "slotchange event: A slot is assigned to another slot.");
</script>
<div id="test6">
<div id="host1">
<template data-mode="open">
<div id="host2">
<template data-mode="open">
<slot id="s2" name="slot2"></slot>
</template>
<slot id="s1" name="slot1" slot="slot2"></slot>
</div>
</template>
</div>
</div>
<script>
async_test((test) => {
let n = createTestTree(test6);
removeWhiteSpaceOnlyTextNodes(n.test6);
doneIfSlotChange([n.s2], test);
n.s1.remove();
}, "slotchange event: Even if distributed nodes do not change, slotchange should be fired if assigned nodes are changed.");
</script>