Unexpected token '<' when trying to load my webcomponent in html
Question
so im trying to create a react webcomponent. I wrap it and on VSCode looks fine, but when I'm trying to load it, it gives me the error: Unexpected token '<' on the line:
ReactDOM.render(<Counter/>, mountPoint);
Does anyone know why and how to fix it? thanks
This is my WebComponent:
import React from 'react';
import * as ReactDOM from 'react-dom';
import Counter from './counter';
class CounterWC extends HTMLElement {
connectedCallback() {
// Create a ShadowDOM
const root = this.attachShadow({ mode: 'open' });
// Create a mount element
const mountPoint = document.createElement('div');
root.appendChild(mountPoint);
// You can directly use shadow root as a mount point
ReactDOM.render(<Counter/>, mountPoint);
}
}
customElements.define('counter-wc', CounterWC)
And this is my html:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-9" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<h1>React webcomponent:</h1>
<counter-wc></counter-wc>
<script type="module" src="./counterWC.js"></script>
</body>
</html>
1 answers
solution1
1 2023-01-25 17:08:15
Re: comments
The fact that you name your file *.js doesn't mean it is JavaScript
ReactDOM.render(<Counter/>, mountPoint); is JSX, not JavaScript, it needs to be converted in a Build step to JavaScript.
Or do not use React at all:
class CounterWC extends HTMLElement { constructor(){ super().attachShadow({mode: 'open'}).append(this.div = document.createElement('div')); } connectedCallback() { this.div.innerHTML = `Am I a counter?`; } } customElements.define('counter-wc', CounterWC);
<counter-wc></counter-wc>
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