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HTML | DOM Input Radio required Property
  • Difficulty Level : Basic
  • Last Updated : 25 Mar, 2019

The DOM Input Radio required Property in HTML DOM is used to set or return whether Input Radio Field should be checked or not when submitting the form. This property is used to reflect the HTML required attribute.

Syntax:

  • It returns the Input Radio required property.
    radioObject.required
  • It is used to set the Input Radio required property.
    radioObject.required = true|false

Property Values:

  • true: It specifies that the Radio field must be checked out before submitting the form.
  • false: It is the default value. It specifies that the Radio field must not be checked out before submitting the form.

Return Value: It returns a Boolean value which represents that the Radio Field must be checked or not before submitting the form.

Example-1: This example illustrates how to return Input Radio required property.



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<!DOCTYPE html>
<html>
  
<head>
    <style>
        body {
            text-align: center;
        }
          
        h1 {
            color: green;
        }
    </style>
</head>
  
<body>
    <h1>
      GeeksforGeeks
  </h1>
  
    <h2>
      HTML DOM Input Radio required Property
  </h2
  Radio Button:
    <input type="radio"
           checked=true 
           id="radioID"
           value="Geeks_radio"
           required>
    <br>
    <br>
    <button onclick="GFG()">
        Click!
    </button>
    <p id="GFG" 
       style="font-size:25px;
              color:green;">
  </p>
    <script>
        function GFG() {
  
            // Accessing input element 
            // type="radio" 
            var x =
                document.getElementById(
                  "radioID").required;
            
            document.getElementById(
              "GFG").innerHTML = x;
        }
    </script>
  
</body>
  
</html>

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Output:
Before Clicking On Button:

After Clicking On Button:

Example-2: This Example illustrates how to set the Input Radio required Property.

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<!DOCTYPE html>
<html>
  
<head>
    <style>
        body {
            text-align: center;
        }
          
        h1 {
            color: green;
        }
    </style>
</head>
  
<body>
    <h1>
      GeeksforGeeks
  </h1>
  
    <h2>
      HTML DOM Input Radio required Property
  </h2
  Radio Button:
    <input type="radio"
           checked=true
           id="radioID"
           value="Geeks_radio"
           required>
    <br>
    <br>
    <button onclick="GFG()">
        Click!
    </button>
    <p id="GFG" 
       style="font-size:25px;
              color:green;">
  </p>
    <script>
        function GFG() {
  
            // Accessing input element 
            // type="radio" 
            var x =
                document.getElementById(
                  "radioID").required = "false";
            
            document.getElementById(
              "GFG").innerHTML = x;
        }
    </script>
  
</body>
  
</html>

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Output:
Before Clicking On Button:

After Clicking On Button:

Supported Browsers: The browser supported by DOM input Radio required Property are listed below:

  • Google Chrome
  • Internet Explorer 10.0 +
  • Firefox
  • Opera
  • Safari

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