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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
Example
Check if the "Blue" radio button is checked by default:
<html>
<head>
<script type="text/javascript">
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>
<head>
<script type="text/javascript">
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
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Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.