jQuery .on() and .off () Methods

New Event API

The new .on() and .off() methods provides ways of attaching and removing event handlers to the currently selected set of elements in the jQuery object. $(el).on () gives the developers an unified way of binding events for any event types, direct and delegated events. It also allows you to bind more than one events at the same time by passing an object .

Syntax:
$(elements).on(events [, selector] [, data] , handler);
$(elements).off([ events ] [, selector] [, handler]);

// An example of binding a click event in before version 1.7 and version 1.7 is illustrated below:
$(“a#vikas”).click(Handler); // Click event before jQuery 1.7
$(“a#vikas”).bind(“click”, Handler); // Binding click event before jQuery 1.7
$(“a#vikas”).on(“click”, Handler); // Click event in jQuery 1.7

// Similar example for .delegate() and .undelegate() methods is shown below:
$(‘.container’).delegate(‘a.vikas, ‘click’, Handler);
$(‘.container’).undelegate(‘a.vikas, ‘click’, Handler);

//Above code can be replaced by the following code in the version 1.7
$(‘.container’).on(‘click’, ‘a.vikas, Handler);
$(‘.container’).off(‘click’, ‘a.vikas, Handler);

Reference:
http://api.jquery.com/on
http://api.jquery.com/off