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non-bubbling-composed-events.html
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non-bubbling-composed-events.html
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<!DOCTYPE html>
<html>
<head>
<title>Event Propagation (bubbles: false, composed: true)</title>
<meta name="author" title="Eugene Kashida" href="mailto:[email protected]">
</head>
<body>
<script>
const bubblePhaseLogs = [];
const capturePhaseLogs = [];
class Parent extends HTMLElement {
constructor() {
super();
this._shadowRoot = this.attachShadow({ mode: 'open' });
}
connectedCallback() {
this._shadowRoot.innerHTML = `
<div>
<child-element></child-element>
</div>
`;
}
}
class Child extends HTMLElement {
constructor() {
super();
this._shadowRoot = this.attachShadow({ mode: 'open' });
}
connectedCallback() {
this._shadowRoot.innerHTML = `
<div>
<span></span>
</div>
<button>dispatch "foo" event</button>
`;
const span = this._shadowRoot.querySelector('span');
const button = this._shadowRoot.querySelector('button');
button.addEventListener('click', () => {
span.dispatchEvent(
new CustomEvent('foo', {
bubbles: false,
composed: true
})
);
console.log('capture phase', capturePhaseLogs);
console.log('bubble phase', bubblePhaseLogs);
});
}
}
function addListeners(node, capture) {
let logs = capture ? capturePhaseLogs : bubblePhaseLogs;
while (node !== undefined) {
node.addEventListener('foo', (event) => {
logs.push([
event.currentTarget,
event.target,
event.composedPath()
]);
}, capture);
node = node.parentNode ? node.parentNode : node.host;
}
}
customElements.define('child-element', Child);
customElements.define('parent-element', Parent);
const parentElement = document.createElement('parent-element');
document.body.appendChild(parentElement);
const span = parentElement.shadowRoot
.querySelector('child-element').shadowRoot
.querySelector('span');
addListeners(span, false);
addListeners(span, true);
</script>
</body>
</html>