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JS & DOM Reference

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Radio defaultChecked Property

Radio Object

Definition and Usage

The defaultChecked property returns the default value of the checked attribute.

This property returns true if the radio button is checked by default, otherwise it returns false.

Syntax

radioObject.defaultChecked

Browser Support

The defaultChecked property is supported in all major browsers.

Example

Check if the "Blue" radio button is checked by default:

<html>
<head>
<script>
function displayResult()
{
var x=document.getElementById("blue").defaultChecked;
alert(x);
}
</script>
</head>
<body>

<form>
What color do you prefer?<br>
<input type="radio" name="colors" id="red">Red<br>
<input type="radio" name="colors" id="blue" checked="checked">Blue<br>
<input type="radio" name="colors" id="green">Green
</form>

<button type="button" onclick="displayResult()">Is "Blue" checked by default?</button>

</body>
</html>

Try it yourself »

Radio Object