JavaScript Tutorial

checked

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>checked demo</title>
  <style>
  div {
    color: red;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<form>
  <p>
    <input type="checkbox" name="newsletter" value="Hourly" checked="checked">
    <input type="checkbox" name="newsletter" value="Daily">
    <input type="checkbox" name="newsletter" value="Weekly">
    <input type="checkbox" name="newsletter" value="Monthly" checked>
    <input type="checkbox" name="newsletter" value="Yearly">
  </p>
</form>
<div></div>
<script>
    var countChecked = function() {
      var n = $( "input:checked" ).length;
      $( "div" ).text( n + (n === 1 ? " is" : " are") + " checked!" );
    };
    countChecked();
    $( "input[type=checkbox]" ).on( "click", countChecked );
</script>
</body>
</html>