How to Enable a Button When All Radio Buttons Are Selected?

Описание: Learn how to create a JavaScript solution that enables a button when all radio button options are selected in your form.
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This video is based on the question https://stackoverflow.com/q/68192708/ asked by the user 'Rewoltor' ( https://stackoverflow.com/u/14742874/ ) and on the answer https://stackoverflow.com/a/68192929/ provided by the user 'Nitheesh' ( https://stackoverflow.com/u/6099327/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Enable a Button When All Radio Buttons Are Selected?

Have you ever found yourself working on an online form where certain actions (like submitting a response) should only take place after specific selections are made? If you're building a quiz, survey, or test, it’s common to want to ensure that users respond to all questions before proceeding. In this post, we’ll explore how to enable a button only when all radio buttons in a set are selected.

Understanding the Problem

You might be facing a scenario where you have multiple sets of radio buttons (for example, test questions) and you want to ensure that the user selects one option from each set before they can click on the "Next" button. The main challenge lies in implementing the right JavaScript logic to check if each of these options has been selected.

Solution Overview

The solution involves writing a JavaScript function that:

Listens for changes to any of the radio buttons.

Counts the number of questions in which a choice has been made.

Enables the button if all questions have been answered.

Required HTML Structure

To implement this, you can use a HTML structure similar to the following:

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

Implementing the JavaScript Functionality

Here's how you can implement the JavaScript portion to achieve the desired functionality:

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

Explanation of the Code

numberOfSelectedQuestions() Function: This function checks each question's group of radio buttons, counting how many groups have at least one selected option.

onChange() Function: This function runs every time a radio button is changed, enabling or disabling the button based on whether all questions are answered.

Event Listener: We attach an event listener to each radio button so that any change in selection will trigger the onChange() function.

Conclusion

By incorporating this JavaScript logic into your form, you can ensure that users cannot proceed until they have made selections for all required questions. This improves user experience and ensures complaints related to incomplete submissions are reduced.

Implement this solution on your forms, and enhance the interactivity of your websites!