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How to disable radio button using JavaScript?

Radio button is an input type that is used to get input from the user by selecting one value from multiple choices. You have seen the radio buttons to choose gender between male and female. We select only one entry, either male or female and leave the other entries are unselected.

There might be some cases when we need to disable the other entries based on some conditions. You can enable and disable the radio button by using the disabled property of HTML DOM. Set this property to true (disable=true) to disable the radio button in JavaScript.

Disable the radio button

Sometimes, we need to disable the radio button for a specific condition. These are special conditions when we disable the radio button. When the radio buttons get disabled, their color changed to grey.

In the below examples, we will learn how to disable the radio button:

Disable radio button using dropdown

Here, we will use a dropdown list having Yes and No as values to enable or disable the radio buttons. If you choose No, all the radio buttons will be disabled. On the other hand, all the radio buttons will be enabled if you select Yes.

Note that you can use the checkbox as well instead of a dropdown list.

Copy Code

     <html>
<script>
function verifyAnswer() {
//get the selected value from the dropdown list
var mylist = document.getElementById("myAns");
var result = mylist.options[mylist.selectedIndex].text;
  if (result == 'No') {
  	//disable all the radio button 
	document.getElementById("csharp").disabled = true;
  	document.getElementById("js").disabled = true;
  	document.getElementById("angular").disabled = true;
  } else {
  	//enable all the radio button
  	document.getElementById("csharp").disabled = false;
  	document.getElementById("js").disabled = false;
  	document.getElementById("angular").disabled = false;
  }
}
</script>

<body>
<h2> Disable radio Button using dropdown </h2>
<form>
<!-- create a dropdown list -->
<h3> Are you a developer? </h3>
<select id = "myAns" onchange = "verifyAnswer()" >
<option value="choose"> --choose -- </option>
<option value="yes"> Yes </option>
<option value="no"> No </option>
</select>
</form>

<p> <b> If Yes, Choose language your preferred programming Language</b> </p>
<!-- create a set of radio buttons -->
<label> <input type="radio" name="programming" id="csharp" value= "csharp"> C# </label>
<label> <input type="radio" name="programming" id="js" value= "js"> JavaScript </label>
<label> <input type="radio" name="programming" id="angular" value= "angular"> Angular </label>
</body>
</html>

    

Test it Now

Output 1

You will get the output same as the given below by running the above code. Here, first choose either Yes or No from the dropdown list.

How to disable radio button using JavaScript

Output 2

By selecting No from the dropdown list, all radio buttons will get disabled, and you will not be allowed to choose any of the programming languages. See the screenshot below:

Output 2

By selecting Yes from the dropdown list, all radio buttons will get enabled again. So, you will be able to choose one programming language. See the screenshot below:

Disable radio button using checkbox

Now we will use a checkbox to disable the radio button.

Copy Code

     <html>
<script>
function verifyAnswer() {
    //disable all the radio button 
	document.getElementById("csharp").disabled = true;
  	document.getElementById("js").disabled = true;
  	document.getElementById("angular").disabled = true;
	
    //get the value if checkbox is checked
    var dev = document.getElementById("myCheck").checked;
    if (dev == true) {
	//enable all the radio button
  	  document.getElementById("csharp").disabled = false;
  	  document.getElementById("js").disabled = false;
  	  document.getElementById("angular").disabled = false;
   }
}
</script>

<body>
<h2> Disable radio Button using checkbox </h2>
<form>
<!-- create a dropdown list -->
<h3> Are you a developer? </h3>
Yes: 
<input type="checkbox" id="myCheck" onchange="verifyAnswer()" checked>
</form>

<p> <b> If Yes, Choose language your preferred programming Language</b> </p>
<!-- create a set of radio buttons -->
<label> <input type="radio" name="programming" id="csharp" value= "csharp"> C# </label>
<label> <input type="radio" name="programming" id="js" value= "js"> JavaScript </label>
<label> <input type="radio" name="programming" id="angular" value= "angular"> Angular </label>
</body>
</html>

    

Test it Now

Output

You will get the output same as the given below by running the above code. Here, checkbox is already checked, you just need to choose one programming language by clicking on radio button.

Uncheck the checkbox if you are not a developer. The radio buttons will get disabled by unchecking the checkbox.

So, these are the different methods to disable the radio button.

A simple radio button example

It is a simple example of radio button created. In this example, we will create set of radio button for gender and language selection. The input will be taken using the HTML form and calculated by JavaScript. See the code below:

Copy Code

     <html>
<script>
function calValue() {
//fetch all gender radio button data
var male = document.getElementById('g1');
var female = document.getElementById('g2');
var otherg = document.getElementById('g3');

//fetch all language radio button data
var hindi = document.getElementById('l1');
var english = document.getElementById('l2');
var otherl = document.getElementById('l3');

var gender;
var language;
//check which gender is selected using radio button
if(male.checked == true) {
  gender = male; 
} else if(female.checked == true) {
  gender = female; 
} else if(otherg.checked == true) {
  gender = otherg 
}

//check which language is selected using radio button
if(hindi.checked == true) {
  language = hindi; 
} else if(english.checked == true) {
  language = english; 
} else if(otherl.checked == true) {
  language = otherl 
}
//return data to HTML form
return document.getElementById("result").innerHTML = "Your selected gender is: " + gender.value + "</br> and </br> Selected language is: " + language.value;
}
</script>

<body>
<h2> Simple radio Buttons Example </h2>
  <!-- create radio button for gender selection -->
  <p> <b> Select your gender: </b> </p>
  <input type="radio" id="g1" name="gender" value="male">
  <label for="male"> Male </label> <br>
  <input type="radio" id="g2" name="gender" value="female">
  <label for="female"> Female </label> <br>
  <input type="radio" id="g3" name="gender" value="other">
  <label for="other"> Other </label>

  <br>  
  <!-- create radio button for language selection -->
  <p> <b> Select your language: </b> </p>
  <input type ="radio" id="l1" name="language" value="hindi">
  <label for ="male"> Hindi </label> <br>
  <input type="radio" id="l2" name="language" value="english">
  <label for="female"> English </label> <br>
  <input type="radio" id="l3" name="language" value="other">
  <label for="other"> Other </label> <br> <br>
  
  <input type="submit" value="Submit" onclick="calValue()">
  <h3 id="result" style="color:blue"> </h3>
</body>
</html>

    

Test it Now

Output

See the below screenshot for radio button. Here, selects one value from each set of radio buttons. We have selected gender = female and language = hindi.

After selecting the radio button values, click on the Show Selected Values button, and you will get the selected values have displayed on the web.