very tiny Pub/Sub implementation that utilizes native browser event methods. ( only browsers .. no IE8 )

tiny-js-pubsub.js

/*! Js Pub/Sub
 * http://anasnakawa.com/
 * Copyright (c) Anas Nakawa 
 * inspired by Ben Alman's one <https://gist.github.com/cowboy/661855>
 * MIT License  
 */

(function( p ) {
  
  var e = p.e = {};
  
  p.publish = function( name, data ) {
    ( e[ name ] = e[ name ] || new Event( name ) ).data = data;
    dispatchEvent( e[ name ] );
  };
  
  p.subscribe = function( name, handler, context ) {
    addEventListener( name, handler.bind( context ) );
  };

  p.unsubscribe = function( name, handler, context ) {
    removeEventListener( name, handler.bind( context ) );
  };

})( this.pubsub = {} );

how to use it:

pubsub.subscribe( 'something', function( e ) {
  // data available as e.data 
});

pubsub.publish( 'something', { some: 'data' }); 

wonderful ! thx

very useful

Hope this helps.

The handler.bind( context ) in both the add and remove event listener will cause issues as remove never actually works...

EX: the second publish you'd hope doesn't log anything because it was supposedly unsubscribed (but it actually wasn't...)

function handler( e ) {
  // data available as e.data 
  console.log('hello');
}

pubsub.subscribe( 'something', handler);

pubsub.publish( 'something', { some: 'data' });

pubsub.unsubscribe( 'something', handler);

pubsub.publish( 'something', { some: 'data' });

the fix: don't bind any context - let that be done by the person creating the handler function itself

/*! Js Pub/Sub
 * http://anasnakawa.com/
 * Copyright (c) Anas Nakawa 
 * inspired by Ben Alman's one <https://gist.github.com/cowboy/661855>
 * MIT License  
 */

(function( p ) {
  
  var e = p.e = {};
  
  p.publish = function( name, data ) {
    ( e[ name ] = e[ name ] || new Event( name ) ).data = data;
    dispatchEvent( e[ name ] );
  };
  
  p.subscribe = function( name, handler ) {
    addEventListener( name, handler );
  };

  p.unsubscribe = function( name, handler ) {
    removeEventListener( name, handler );
  };

})( this.pubsub = {} );