How to Execute Function After Submit and Page Load in JavaScript

Learn how to ensure your error messages in a registration form persist through page reloads, keeping your users informed and your UI functional.
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How to Execute Function After Submit and Page Load in JavaScript

When building web applications, especially forms for user inputs like registrations, managing states can sometimes become cumbersome. One common issue faced by developers is retaining messages, such as error notifications, after the form submission and page reload. If you're encountering this issue, you're not alone, and today's post will clarify how to effectively handle this situation.

The Problem

You have a registration form that validates user input. Once the user submits the form, the page reloads, which unfortunately causes error messages to disappear. You want to retain these messages after the page reload to enhance the user experience. In simpler terms, how can you make sure that the error messages or any relevant information persists even after the submission and page refresh?

The Solution

To solve the problem of persisting messages across page reloads, we can utilize various techniques. Below, we'll discuss a simple but effective approach by leveraging the localStorage feature of web browsers alongside JavaScript functions to ensure that your error messages are displayed even after page reloads.

Step 1: Validate Input and Display Error Messages

You should first validate your form inputs in your JavaScript file. Here is a basic example:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Store Messages in localStorage

Whenever there’s an error, the corresponding message is saved to localStorage. This feature allows us to store key-value pairs in the browser, which remain even after the page is refreshed.

Step 3: Retrieve Messages on Page Load

Next, you need to ensure that any error messages are displayed if the page reloads. This can be done by checking localStorage when the DOM content is loaded, as follows:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Attach Events to Your Form

Make sure that your form is calling the validation function on submission and that it prevents a form submission if there are errors.

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By utilizing localStorage along with proper event handling, you can ensure that error messages are displayed to users even after they submit the form and refresh the page. This method enhances the usability of your application and keeps your users informed about their inputs. Remember that user experience is key, and with this solution, you can easily maintain a friendly interface even within the common frustrations of form handling.

Now that you know how to implement this, you can create a robust form handling experience for your web applications. Happy coding!