How to inject a preload script into page?

[Nashorn]

I need to inject a preload script into the page as early as possible (DOMContentLoaded would be nice). Is BrowserPage.evaluate() the only way to do this?

[capricorn86]

Hi @Nashorn!
There is a quite new setting with the name navigation.beforeContentCallback that can be used for this.

It's also now possible to send in the callback to BrowserPage.goto().

Example:

import { Browser } from "happy-dom";

const browser = new Browser();
const page = browser.newPage();

await page.goto("https://example.com", {
    beforeContentCallback: (window) => {
        const script = window.document.createElement('script');
        script.innerHTML = "console.log('Before content loaded')";
        window.document.body.appendChild(script);
    }
});

await browser.close();