Web Reference: If you want something to be done right away without waiting for any event then you can just do it in the JavaScript - you don't have to do anything for your code to run right away, just don't do anything that would make your code wait. Jun 19, 2025 · Learn how to inject scripts before page load, manage early execution challenges, and ensure performance and stability across browsers. Jan 16, 2026 · To execute JavaScript immediately before form submission, the form’s submit event is your solution. It reliably intercepts all submission paths, gives you control to validate or modify data, and ensures your code runs at the critical moment before the browser sends the request.
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