A simple example to select a radio button with jQuery dynamically.

A radio buttons group, with a name=”sex”.

<input type="radio" name="sex" value="Male">Male</input>
<input type="radio" name="sex" value="Female">Female</input>
<input type="radio" name="sex" value="Unknown">Unknown</input>

1. To display the selected radio button value.

$('input:radio[name=sex]:checked').val();

2. To select a radio button (Male).
The radio button is 0-based, so the ‘Male’ = ’0′, ‘Female’ = ’1′ and ‘Unknown’ = ’2′.

$('input:radio[name=sex]:nth(0)').attr('checked',true);
or
$('input:radio[name=sex]')[0].checked = true;

3. To select a radio button (Female).

$('input:radio[name=sex]:nth(1)').attr('checked',true);
or
$('input:radio[name=sex]')[1].checked = true;

4. To select a radio button (Unknown).

$('input:radio[name=sex]:nth(2)').attr('checked',true);
or
$('input:radio[name=sex]')[2].checked = true;

5. To reset the selected radio button.

$('input:radio[name=sex]').attr('checked',false);

jQuery select a radio button example

<html>
<head>
<title>jQuery select a radio button example</title>
 
<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
 
</head>
 
<body>
 
<h1>jQuery select a radio button example</h1>
 
<script type="text/javascript">
 
  $(document).ready(function(){
 
    $("#isSelect").click(function () {
 
	alert($('input:radio[name=sex]:checked').val());
 
    });
 
    $("#selectMale").click(function () {
 
	$('input:radio[name=sex]:nth(0)').attr('checked',true);
	//$('input:radio[name=sex]')[0].checked = true;
 
    });
 
    $("#selectFemale").click(function () {
 
	$('input:radio[name=sex]:nth(1)').attr('checked',true);
	//$('input:radio[name=sex]')[1].checked = true;
 
    });
 
    $("#selectUnknown").click(function () {
 
	$('input:radio[name=sex]:nth(2)').attr('checked',true);
	//$('input:radio[name=sex]')[2].checked = true;
 
    });
 
    $("#reset").click(function () {
 
	$('input:radio[name=sex]').attr('checked',false);
 
    });
 
  });
</script>
</head><body>
 
<input type="radio" name="sex" value="Male">Male</input>
<input type="radio" name="sex" value="Female">Female</input>
<input type="radio" name="sex" value="Unknown">Unknown</input>
 
<br/>
<br/>
<br/>
 
<input type='button' value='Display Selected' id='isSelect'>
<input type='button' value='Select Male' id='selectMale'>
<input type='button' value='Select Female' id='selectFemale'>
<input type='button' value='Select Unknown' id='selectUnknown'>
<input type='button' value='Reset' id='reset'>
 
</body>
</html>
Try Demo
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