How to load the javascript file in dom and start using by another javascript

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I am working with javascript implementation, in which there it two class based javascript file namely Product and Order, i want to load the product js file by Order js file and start executing the all functionality from product file. but unable to do this, please help,
please see below code;

following error coming:

ERROR

Product is not defined

What I have tried:

product.js file:

JavaScript

class Product {
    constructor() {

    }
    getProducts() {
        return "all product will retur from here";
    }
}

order.js file

class Order {
    constructor() {

    }
    loadProductScript() {
        $("head").append(
            $("<script>")
                .attr("src",'/Product.js').attr("type", "text/javascript")
                .on("load", function () {
                })
        );
    }
    getOrders() {
        return "all data will return from this method";
    }
}

html file content

<script src="baseAddress/order.js"></script>

<script>
let order=new Order();
order.loadProductScript();
    let product=new Product();
    product.getProducts();
</script>

Posted 29-May-24 19:31pm

Member 10371658

Updated 30-May-24 7:16am

Andre Oosthuizen

v3

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Richard Deeming · Accepted Answer · 2024-05-29T22:16:00

You need to include all of the required scripts, in the correct order, before you can use them. Since order.js depends on product.js, you need to add:

HTML

<script src="baseAddress/product.js"></script>
<script src="baseAddress/order.js"></script>

Alternatively, you can rewrite your scripts as JavaScript modules[^], which would allow the scripts to declare their dependencies up-front. But note the limits on cross-browser compatibility mentioned in the MDN article.

product.js:

JavaScript

class Product {
    constructor() {

    }
    getProducts() {
        return "all product will retur from here";
    }
}

export { Product };

order.js:

JavaScript

import { Product } from "./product.js";

class Order {
    constructor() {

    }
    getOrders() {
        return "all data will return from this method";
    }
}

export { Order };

main.js:

JavaScript

import { Product } from "./product.js";
import { Order } from "./order.js";

let order = new Order();
let product = new Product();
product.getProducts();
...

HTML file:

HTML

<script type="module" src="baseAddress/main.js"></script>