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native-composed-events.html
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native-composed-events.html
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<!DOCTYPE html>
<html>
<head>
<title>Custom Elements: Which native events are composed?</title>
<meta name="author" title="Eugene Kashida" href="mailto:[email protected]">
</head>
<body>
<script>
class MyCustomElement extends HTMLElement {
constructor() {
super();
this._shadowRoot = this.attachShadow({ mode: 'closed' });
[
'change',
'click',
'drag',
'focusin',
'focusout',
'input',
].forEach(eventName => {
this.addEventListener(
eventName,
event => console.log(`${eventName} event is composed`)
);
});
this._shadowRoot.addEventListener('change', event => {
console.log('change event handled on the shadow root');
});
}
connectedCallback() {
this._shadowRoot.innerHTML = `
<input>
`;
}
}
customElements.define('my-custom-element', MyCustomElement);
var instance = document.createElement('my-custom-element');
document.body.appendChild(instance);
</script>
</body>
</html>