HTML | DOM Input Checkbox defaultValue Property

Last Updated : 23 Sep, 2022

The DOM Input Checkbox defaultValue Property is used to set or returns the default value of an Input Checkbox 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 indicates the default value and the value contains the current value after making some changes. This property is useful to find out whether the input checkbox field has been changed or not.

Syntax:

It returns the defaultValue property.

checkboxObject.defaultValue

It is used to set the defaultValue property.

checkboxObject.defaultValue = value

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

Return Value: It returns a string value which represent the default value of the Input checkbox field.

Example 1: This example illustrates how to return Input checkbox defaultValue Property.

HTML

<!DOCTYPE html>
<html>
<head>
    <title>
        DOM Input Checkbox defaultvalue Property
    </title>
</head>
<body style="text-align: center;">
    <h1 style="color:green;">
        GeeksforGeeks
    </h1>
    <h2>DOM Input Checkbox defaultvalue Property</h2>
    <form>

        <!-- Below input elements have attribute 
                checked -->
        <input type="checkbox" name="check" id="GFG" 
            value="1" checked>Checked by default<br>
        <input type="checkbox" name="check" value="2">
        Not checked by default<br>
    </form> <br>
    <button onclick="myGeeks()">
        Submit
    </button>
    <p id="sudo" style="color:green;font-size:30px;"></p>


    <!-- script to return Input Checkbox value Property -->
    <script>
        function myGeeks() {
            var g = document.getElementById("GFG").defaultValue;
            document.getElementById("sudo").innerHTML = g;
        } 
    </script>
</body>
</html>

Output:

Before Clicking On Button:

After Clicking On Button:

Example 2: This example illustrates how to set Input checkbox defaultValue Property.

HTML

<!DOCTYPE html>
<html>
<head>
    <title>
        DOM Input Checkbox defaultvalue Property
    </title>
</head>
<body style="text-align: center;">
    <h1 style="color:green;">
        GeeksforGeeks
    </h1>
    <h2>DOM Input Checkbox defaultvalue Property</h2>
    <form>

        <!-- Below input elements have attribute 
                checked -->
        <input type="checkbox" name="check" id="GFG" 
            value="1" checked>Checked by default<br>
        <input type="checkbox" name="check" value="2">
        Not checked by default<br>
    </form> <br>
    <button onclick="myGeeks()">
        Submit
    </button>
    <p id="sudo" style="color:green;font-size:30px;"></p>


    <!-- script to return Input Checkbox value Property -->
    <script>
        function myGeeks() {
            var g = document.getElementById("GFG").defaultValue = "2";
            document.getElementById("sudo").innerHTML = g;
        } 
    </script>
</body>
</html>