How to check a radio button using JavaScript

Learn, how to programmatically check or uncheck a radio button using JavaScript.

The radio buttons are mostly used to set the group of related options, where only one radio button is selected at a time.

For example, choosing between two contact methods.

<p>Select your contact method :</p>

<input type="radio" name="contact" value="email" id="email"/>
<label for="email">Email</label>
<input type="radio" name="contact" value="phone" id="phone"/>
<label for="phone">Phone</label>

Checking the radio button

To check the radio button, first we need to access it inside JavaScript using document.querySelector() or document.getElementById() methods.

const radioBtn = document.querySelector('#email');

Now, we need to set its checked property to true to check it.

radioBtn.checked = true;

To uncheck it back, we need to set checked property to false;

radioBtn.checked = false;