you need to import the module before using it
<!DOCTYPE html>
<html>
<head>
<title>test</title>
<meta charset="utf-8" />
<script type="module" src="./MyClass.js"></script>
<script type="module" id="m1">
// script module is an "island", not need onload.
'use strict';
import MyClass from './MyClass.js';
let x = new MyClass(11); // we can use here...
console.log("debug m1:", x) // working fine!
window.MyClassRef = MyClass; // "globalizing" class
window.xRef = x // "globalizing" instance
</script>
<script> // NON-module global script
document.addEventListener('DOMContentLoaded',function(){
// only works after all modules loaded:
console.log("debug:", window.xRef) // working fine!
let x = new window.MyClassRef(22); // using class also here,
console.log("debug:", x) // working fine!
}, false); //ONLOAD
</script>
</head>
<body> <p>Hello1!</p> </body>
</html>
There are two ways to use an imported class:
at module scope (script m1): you can use new MyClass(),
and can "globalize" instances (e.g. xRef) or the costructor's class (MyClassRef).
at global scope: to work together other libraries or with main script, use a global reference, e.g. new window.MyClassRef().
All this solution relies upon "static import"...
Optional dynamic import
You can use also import with ordinary default <script> (no type="module"), and no "onload", using this solution, instead the last script:
<script>
'use strict';
import('./MyClass.js').then(({default: MyClass}) => {
alert(123) // async block
let x = new MyClass(11);
});
</script>
See dynamic import.
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