1// jQuery version 1.6 or above use:
2$("#myRadioID").prop("checked", true);
3
4//jQuery versions below 1.6 use:
5$("#myRadioID").attr('checked', 'checked');
1$('#element').click(function() {
2 if($('#radio_button').is(':checked')) { alert("it's checked"); }
3});
4
1$(document).ready(function(){
2 $('#submit_button').click(function() {
3 if (!$("input[name='name']:checked").val()) {
4 alert('Nothing is checked!');
5 return false;
6 }
7 else {
8 alert('One of the radio buttons is checked!');
9 }
10 });
11});