HTML | DOM Input Radio defaultvalue Property

The Input Radio defaultValue Property in HTML DOM is used to set or return the default value of a Radio field. This property is used to reflect the HTML value attribute. The main difference between the default value and value is that the default value indicate the default value and the value contains the current value after making some changes. This property is useful to find out whether the Date field have been changed or not.

Syntax:

  • It returns the defaultValue property.
    RadioObject.defaultValue
  • It is used to set the defaultValue property.
    RadioObject.defaultValue = value

Property Values: It contains single property value value which defines the default value for Input Radio field.



Return Value: It returns a string value which represents the default value of the Input Radio field.

Example 1: This example illustrates how to return Input radio defaultValue 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 defaultvalue Property 
    </h2
      
    Radio Button: 
    <input type="radio" checked=true id="radioID"
        value="Geeks_radio"
          
    <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").defaultValue; 
              
            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 Input radio defaultValue 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 defaultvalue Property 
    </h2
      
    Radio Button: 
    <input type="radio" checked=true id="radioID"
                value="Geeks_radio"
    <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"
                    ).defaultValue = "GeeksForGeeks"; 
              
            document.getElementById("GFG").innerHTML
                    = x; 
        
    </script
</body
  
</html>

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Output:

  • Before Clicking On Button:
  • After Clicking On Button:

Supported Browsers: The browsers supported by DOM Input Radio defaultValue Property are listed below:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Apple Safari
  • Opera

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