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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  
  <form id="my-form">
    <input type="checkbox" name="something[1]" value="55" />
​
    <input type="checkbox" name="something[2]" value="55" />
​
    <input type="checkbox" name="something[a]" value="55" />
    
    <input type="submit" onclick="validate(); return false;" value="Test" />
    
  </form>
 
</body>
</html>
 
​
function validate() {
  
  var inputs = document.getElementById('my-form').getElementsByTagName('input');
  var checked = 0; 
  for (var i = 0, length = inputs.length; i < length; i++) {
      if (inputs[i].getAttribute('type') !== 'checkbox') {
         continue;
      }
  
      if (inputs[i].checked) {
          alert(i);
      }
  }
  
  if (checked ==0) {
     alert('Select a checkbox, please!');
  }
​
}
​
Output 300px

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anonymouspro
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