Get checked checkbox : Form CheckBox « jQuery « JavaScript Tutorial

<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
      
              var n = $("input:checked").length;
              $("div").text(n);
          
        });
    </script>
  </head>
  <body>
    <form>
    <input type="checkbox" name="newsletter" checked="checked" />
    <input type="checkbox" name="newsletter" checked="checked"/>
  </form>
  <div></div>

  <div>
  </div>
  </body>
</html>

30.121.Form CheckBox
	30.121.1.	Get checkbox from form controls
	30.121.2.	Get checked checkbox
	30.121.3.	Preset checkbox
	30.121.4.	Check the check box