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Server‐Side Rendering
David Ortner edited this page Oct 16, 2024
·
6 revisions
import { Window } from 'happy-dom';
const window = new Window({
innerWidth: 1024,
innerHeight: 768,
url: 'http://localhost:8080'
});
const document = window.document;
document.write(`
<html>
<head>
<title>Test page</title>
</head>
<body>
<div class="root"></div>
<script src="app.js"></script>
</body>
</html>
`);
// Waits for all async operations to complete
// Note that this may get stuck when using intervals or a timer in a loop
await window.happyDOM.waitUntilComplete();
// Do something with the result
console.log(window.document.documentElement.outerHTML);
// Cancels all ongoing operations and destroys the Window instance
await window.happyDOM.close();Happy DOM supports rendering custom elements (web components) server-side using a new web feature called Declarative Shadow DOM.
Unsupported browsers will safely fallback to being rendered using client side Javascript.
import { Window } from 'happy-dom';
const window = new Window({
innerWidth: 1024,
innerHeight: 768,
url: 'http://localhost:8080'
});
const document = window.document;
document.write(`
<html>
<head>
<title>Test page</title>
</head>
<body>
<div>
<my-custom-element>
<span>Slotted content</span>
</my-custom-element>
</div>
<script>
class MyCustomElement extends HTMLElement {
constructor() {
super();
this.attachShadow({ mode: 'open', serializable: true });
}
connectedCallback() {
this.shadowRoot.innerHTML = \`
<style>
:host {
display: inline-block;
background: red;
}
</style>
<div><slot></slot></div>
\`;
}
}
customElements.define('my-custom-element', MyCustomElement);
</script>
</body>
</html>
`);
/*
Will output:
<my-custom-element>
<span>Slotted content</span>
<template shadowroot="open" shadowrootserializable="">
<style>
:host {
display: inline-block;
background: red;
}
</style>
<div><slot></slot></div>
</template>
</my-custom-element>
*/
console.log(document.body.querySelector('div').getHTML({ serializableShadowRoots: true }));