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Discover how to implement `client-side validation` for multiple dynamic forms using JavaScript, ensuring users make a selection before submission.
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Client-Side Form Validation: Ensuring Choices for Multiple Forms on a Single Page

When building web applications, user experience is a paramount concern. One issue that often arises during form submissions is ensuring that the user has made a selection in each dynamic form. This is particularly relevant when working with multiple forms on a single page. If not handled properly, users might overlook selecting an option, leading to submission errors and frustration.

In this guide, we will explore a practical solution to enforce selection within multiple forms using client-side validation with JavaScript.

Understanding the Problem

Let's take a look at a typical scenario: you have several forms (like decisions for applications) presented dynamically on your webpage. Each form allows users to select an option—“Shortlist” or “Reject.” The challenge is ensuring that users make a selection in every form before submitting any of them.

Here’s a simplified HTML structure of the forms:

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When users try to submit without making a selection, we want to display an error message prompting them to do so.

The Solution

To implement this validation, we will write a JavaScript function that checks if an option has been selected for each form. Here’s how we can achieve this step by step:

1. Selecting Form Elements

First, we will gather all the form elements using document.querySelectorAll and target the radio buttons:

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

This captures all radio buttons associated with our decision options.

2. Validating Selections

Next, we need to loop through each form element and check if either the “Shortlist” or “Reject” option is selected. If neither is selected, we will display an error message:

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

3. Removing Error Messages

To enhance user experience, we will also add event listeners to the radio buttons. If the user makes a selection after seeing the error message, it should be removed:

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

Final Implementation

Here is the complete function that provides the client-side validation we need:

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

Conclusion

In this guide, we tackled the challenge of ensuring that at least one option is selected in multiple forms on a single page using client-side validation. This not only improves the user experience but also prevents unnecessary errors at submission.

With a solid understanding of how to validate user selections, you can better manage forms on your web applications, ensuring that users provide the necessary input before proceeding.

Feel free to use the provided code as a foundation to build your own validation logic, adapting it to suit your unique application needs!