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JS & DOM Reference

Overview

JavaScript Objects

JS Array
JS Boolean
JS Date
JS Math
JS Number
JS String
JS RegExp
JS Global

Browser Objects

Window
Navigator
Screen
History
Location

Core DOM Objects

DOM Node
DOM NodeList
DOM NamedNodeMap
DOM Document
DOM Element
DOM Attr

HTML DOM Objects

DOM Document
DOM Events
DOM Elements

DOM Anchor
DOM Area
DOM Base
DOM Body
DOM Button
DOM Form
DOM Frame/IFrame
DOM Frameset
DOM Image
DOM Input Button
DOM Input Checkbox
DOM Input File
DOM Input Hidden
DOM Input Password
DOM Input Radio
DOM Input Reset
DOM Input Submit
DOM Input Text
DOM Link
DOM Meta
DOM Object
DOM Option
DOM Select
DOM Style
DOM Table
DOM td / th
DOM tr
DOM Textarea

Radio value Property

Radio Object

Definition and Usage

The value property sets or returns the value of the value attribute of the radio button.

For radio buttons, the contents of the value property do not appear in the user interface. The value property only has meaning when submitting a form. If a radio button is in checked state when the form is submitted, the name of the radio button is sent along with the value of the value property (if the radio button is not checked, no information is sent).

Tip: Define different values for radio buttons in the same group, to identify (on the server side) which one was checked.

Syntax

Set the value property:

radioObject.value="value"

Return the value property:

radioObject.value

Browser Support

The value property is supported in all major browsers.

Examples

Example 1

Display the value of the "Red" radio button:

<html>
<head>
<script type="text/javascript">
function displayResult()
{
var x=document.getElementById("red").value;
alert(x);
}
</script>
</head>
<body>

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

<button type="button" onclick="displayResult()">Display value</button>

</body>
</html>

Try it yourself »

Example 2

Display the value of the selected radio button:

<html>
<head>
<script type="text/javascript">
function displayResult(browser)
{
document.getElementById("result").value=browser
}
</script>
</head>
<body>

<p>Select your favorite browser:</p>
<form>
<input type="radio" name="browser" onclick="displayResult(this.value)" value="Internet Explorer">Internet Explorer<br />
<input type="radio" name="browser" onclick="displayResult(this.value)" value="Firefox">Firefox<br />
<input type="radio" name="browser" onclick="displayResult(this.value)" value="Opera">Opera<br />
<input type="radio" name="browser" onclick="displayResult(this.value)" value="Google Chrome">Google Chrome<br />
<input type="radio" name="browser" onclick="displayResult(this.value)" value="Safari">Safari<br /><br />
Your favorite browser is: <input type="text" id="result" />
</form>

</body>
</html>