How to Fix Radio Button Checked Attribute Not Updating on Click

Learn how to fix the issue with radio buttons in HTML where the checked attribute doesn't change when clicked. Follow our step-by-step guide to implement a solution using JavaScript.
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This video is based on the question https://stackoverflow.com/q/72040571/ asked by the user 'Shatsuki' ( https://stackoverflow.com/u/17964305/ ) and on the answer https://stackoverflow.com/a/72040838/ provided by the user 'dhruv champaneri' ( https://stackoverflow.com/u/18973205/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem: Radio Button Checked Attribute

When working with forms in web development, radio buttons are a common feature that allows users to select one option from a set. However, you may encounter issues where the checked attribute does not change as expected when you click on different radio buttons. This can be frustrating, especially when you want the selection to be visually represented and data to be accurately captured in your application.

The Scenario

In your code, you might have a setup like this:

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

Here, you have two radio buttons: A4 and Skontrino. While visually it appears that the radio buttons are changing when you click on them, the underlying checked state (HTML checked attribute) may not update properly. This article will guide you on how to ensure the checked attributes change accurately when each radio button is selected.

The Solution: Using JavaScript's onchange Event

To effectively manage the checked states of radio buttons, we can utilize JavaScript’s onchange event listener. This allows us to monitor when a radio button is clicked and take appropriate action to update the checked attributes accordingly.

Step-by-Step Implementation

1. Set Up Event Listeners

You’ll need to add onchange event listeners to both radio buttons. This will allow your script to detect when the user interacts with either button.

2. Define the Change Handler

Next, you will create a JavaScript function that will handle the change event. In this function, you will use setAttribute to mark a radio button as checked and removeAttribute to uncheck the others.

3. Example JavaScript Code

Here is how you can implement it in your code:

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

4. Explanation of the Code

Selecting Radio Buttons: We use document.querySelectorAll to select all radio inputs with the name version_printimi.

Looping Through Buttons: For each radio button, we check which one is currently selected and update the attributes accordingly.

Updating Checked State: We remove the checked attribute from all radio inputs, then use setAttribute to update the selected radio button.

Conclusion

By incorporating this simple JavaScript solution, you can effectively manage the checked attributes of your radio buttons. This ensures that both the visual representation and the underlying data state are consistent with the user’s selection.

Now you can prevent any potential confusion for users and ensure that your forms behave as expected. Happy coding!

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