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### toggleClass( class, [duration] )

Adds the specified class if it is not present, and removes the specified class if it is present, using an optional transition.
Arguments:

class | String |
A CSS class to toggle on the elements.
duration (Optional) | String, Number |
A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).

Examples:

Name | Type
--- | ---

- Demo
- View Source

Toggle the class 'highlight' when a paragraph is clicked with a one second transition.

        $("p").click(function () {
          $(this).toggleClass("highlight", 1000);
        });

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
                        "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
      <script src="http://code.jquery.com/jquery-latest.js"></script>

      <script src="http://dev.jquery.com/view/tags/ui/latest/ui/effects.core.js"></script>

      <script>
      $(document).ready(function(){

        $("p").click(function () {
          $(this).toggleClass("highlight", 1000);
        });

      });
      </script>
      <style>
      p { margin: 4px; font-size:16px; font-weight:bolder;
          cursor:pointer; }
      .blue { color:blue; }
      .highlight { background:yellow; }
      </style>
    </head>
    <body>
      <p class="blue">Click to toggle</p>
      <p class="blue highlight">highlight</p>
      <p class="blue">on these</p>
      <p class="blue">paragraphs</p>
    </body>
    </html>