A simple JavaScript that lets you use your browser's back/forward buttons for in-page navigation by adding custom 'next' and 'previous' events to the window object.

history_navigation.js

/*
 * Lets you use your browser's back/forward buttons for in-page navigation by
 * adding custom 'next' and 'previous' events to the window object.
 *
 * Copyright (c) 2011 Tobias Schneider <schneider@jancona.com>
 * This script is freely distributable under the terms of the MIT license.
 *
 * Example:
 *
 *	window.addEventListener('next', function(){
 *		console.log('forward button clicked');
 *	}, false);
 *
 *	window.addEventListener('previous', function(){
 *		console.log('back button clicked');
 *	}, false);
 */

if(window.history && history.pushState){ // check for history api support
	window.addEventListener('load', function(){
		// create history states
		history.pushState(-1, null); // back state
		history.pushState(0, null); // main state
		history.pushState(1, null); // forward state
		history.go(-1); // start in main state
				
		this.addEventListener('popstate', function(event, state){
			// check history state and fire custom events
			if(state = event.state){
	
				event = document.createEvent('Event');
				event.initEvent(state > 0 ? 'next' : 'previous', true, true);
				this.dispatchEvent(event);
				
				// reset state
				history.go(-state);
			}
		}, false);
	}, false);
}

Copyright 2001? Amazing foresight on pushState! :)

:P

Is this intended for fun or production code? If fun, please ignore the following:

Feels like it would be weird to go to a page and have my forward button enabled even if I hadn't used the back button yet.

Its cool I have tested in modern browsers but in IE9 it has some issues its not working. Is that because we have to use attachEvent() function? please suggest.

It is not working in mac safari browser :(

One thing you must know when using this script, is that you "loose" some data i.e. $_POST when you reload a form that has already been submitted (it should be annoying in some cases).

Line 20 should be using an evaluation === not an assignment =