How Can Post/Redirect/Get (PRG) Prevent Unwanted Form Resubmissions on Page Refresh?

Preventing Form Resubmission on Page Refresh with Post/Redirect/Get

In this situation, where refreshing the page leads to unintended form resubmissions, the Post/Redirect/Get (PRG) pattern offers an effective solution. Let's delve into its implementation.

After the form is submitted, the server executes the following steps:

1. Post: The browser sends the form data to the server.
2. Redirect: The server processes the data and issues a redirect to another page.
3. Get: The browser fetches the new page, effectively clearing the form data.

By redirecting the user after form submission, the browser's implicit GET request on page refresh does not contain any form data, preventing a resubmission.

However, it's crucial to avoid using the Back button as it could repopulate the form with previously submitted data. For a seamless user experience, ensure that the new page provides a clear indication that the data has been successfully submitted.

Javascript Approach using window.history.replaceState

As mentioned in the answer, an alternative approach involves utilizing JavaScript's window.history.replaceState method:

if (window.history.replaceState) {
    window.history.replaceState(null, null, window.location.href);
}

This script alters the browser's history, replacing the current entry with a new one without triggering a page refresh. However, it's important to note that this approach may not be as reliable as the PRG pattern.

Ultimately, the PRG pattern remains a robust solution for preventing form resubmissions on page refresh, while maintaining the form's original URL and providing a user-friendly experience.

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