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});

1if(document.getElementById('gender_Male').checked) {
2  //Male radio button is checked
3}else if(document.getElementById('gender_Female').checked) {
4  //Female radio button is checked
5}

1
2      if ($('input[name='+ radioName +']:checked').length) {
3           // at least one of the radio buttons was checked
4           return true; // allow whatever action would normally happen to continue
5      }
6      else {
7           // no radio button was checked
8           return false; // stop whatever action would normally happen
9      }
10