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JavaScript

/*!
 * jQuery Tiny Pub/Sub for jQuery 1.7 - v0.1 - 27/10/2011
 * Based on @cowboy Ben Alman's REALLY tiny pub/sub
 * Dual licensed under the MIT and GPL licenses.
 */

(function($){

  // Create a "dummy" jQuery object on which to call on, off and trigger event
  // handlers. Note that $({}) works in jQuery 1.4.3+, but because off() (unbind) on
  // a "plain object" throws errors in older versions of jQuery, an element is
  // used here.
  var o = $('<b/>');

  // Subscribe to a topic. Works just like on, except the passed handler
  // is wrapped in a function so that the event object can be stripped out.
  // Even though the event object might be useful, it is unnecessary and
  // will only complicate things in the future should the user decide to move
  // to a non-$.event-based pub/sub implementation.
  $.subscribe = function( topic, fn ) {

    // Call fn, stripping out the 1st argument (the event object).
    function wrapper() {
      return fn.apply( this, Array.prototype.slice.call( arguments, 1 ) );
    }

    // Add .guid property to function to allow it to be easily unbound. Note
    // that $.guid is new in jQuery 1.4+, and $.event.guid was used before.
    wrapper.guid = fn.guid = fn.guid || ( $.guid ? $.guid++ : $.event.guid++ );

    // Bind the handler.
    o.on( topic, wrapper );
  };

  // Unsubscribe from a topic.
  $.unsubscribe = function() {
    o.off.apply( o, arguments );
  };

  // Publish a topic
  $.publish = function() {
    o.trigger.apply( o, arguments );
  };

})(jQuery);



function handle( a, b, c ) {
  console.log( a + b + c );
};

$.subscribe( "/some/topic", handle );

$.publish( "/some/topic", [ "a", "b", "c" ] );
// logs: abc

$.unsubscribe( "/some/topic", handle ); // Unsubscribe just this handler

// Or:

$.subscribe( "/some/topic", function( a, b, c ) {
  console.log( a + b + c );
});

$.publish( "/some/topic", [ "a", "b", "c" ] );
// logs: abc

$.unsubscribe( "/some/topic" ); // Unsubscribe all handlers for this topic