1.5 KiB
1.5 KiB
Web Component Base
This serves as a very minimal base class for creating custom elements.
This does not aim to be an alternative to Lit. Lit is good; use it if you want.
Installation
npm i web-component-base
Usage
When you extend the WebComponent class for your component, you only have to define the template() and observedAttributes(), and the UI will be reactive on attribute changes.
In your component class:
// HelloWorld.mjs
import { WebComponent } from "web-component-base";
export class HelloWorld extends WebComponent {
name = "World";
emotion = "excited";
static get observedAttributes() {
return ["name", "emotion"];
}
get template() {
return `
<h1>Hello ${this.name}${this.emotion === "sad" ? ". 😭" : "! 🙌"}</h1>`;
}
}
customElements.define('hello-world', HelloWorld);
Then changes in the attributes observed will cause the UI to render.
In your HTML page:
<head>
<script type="module" src="HelloWorld.mjs"></script>
</head>
<body>
<hello-world name="Ayo" emotion="sad">
<script>
const helloWorld = document.querySelector('hello-world');
setTimeout(() => {
helloWorld.setAttribute('emotion', 'excited');
}, 2500)
</script>
</body>
The result is a reactive UI that updates on attribute changes:
