HTML | DOM Input Checkbox checked Property

Difficulty Level : Basic
Last Updated : 08 Mar, 2019

The DOM Input Checkbox Property is used to set or return the checked status of a checkbox field. This property is used to reflect the HTML Checked attribute.

Syntax:

It is used to return the checked property.
```
checkboxObject.checked
```
It is used to set the checked property.
```
checkboxObject.checked = true|false
```

Property Values:

true: It defines that checkbox is in checked state.
false: It specify that the checkbox is not checked. It is false by default.

Return Value: It returns a boolean value which represents that whether the checkbox is checked or not.

Example: This example illustrates how to return the Checkbox Checked Property.

<!DOCTYPE html> 
<html> 
    <head> 
        <title>DOM Input Checkbox Checked Property</title>
    </head> 
    <body style = "text-align: center;"> 
        <h1 style = "color: green;">GeeksforGeeks</h1> 
        <h2>DOM Input Checkbox checked 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:20px;"></p>
        <script>
function myGeeks() {
  var g = document.getElementById("GFG").checked;
  document.getElementById("sudo").innerHTML = g;
}
</script>
    </body> 
</html>                     
                                             

Output:
Before clicking on the button:

After clicking on the button:

Example-2: This example illustrates that how to check and uncheck the checkbox.

<!DOCTYPE html> 
<html> 
    <head> 
        <title>DOM Input Checkbox Checked Property</title>
    </head> 
    <body style = "text-align: center;"> 
        <h1 style = "color: green;">GeeksforGeeks</h1> 
        <h2>DOM Input Checkbox  checked Property</h2> 
        <form > 
            <!-- Below input elements have attribute "checked" -->
            <input type="checkbox" name="check" id="GFG" 
                           value="1">Checked by default<br> 
  
            <input type="checkbox" name="check" value="2">
                                 Not checked by default<br> 
        </form> <br>
     <button onclick="myGeeks()">checkt</button>
     <button onclick="Geeks()">Uncheck</button>
    
      <script>
        function myGeeks() {
           var g = document.getElementById("GFG").checked = true;
             }
        function Geeks() {
           var w = document.getElementById("GFG").checked = false;
         }
  
</script>
    </body> 
</html>                     
                                             