Simple pushState wrapper

usage_example.js

	$(document).bind("WithHistory.urlDidChange", function() {
		$.ajax(window.withHistory.url(), {
			dataType: "html",
			success: function(response) {
				var body = response.match(/<body.*?>([\s\S]+?)<\/body>/)[1];
				var tmp = $("<div />");
				tmp.html(body);
				var newContent = tmp.find("#pagecontent").html();
				
				$("#pagecontent").animate({ opacity: 0 }, 250);
				$("html, body").animate({ scrollTop: 0}, 250, function() {
					$("#pagecontent").html(newContent).animate({ opacity: 1 }, 500);
				});
			}
		})
	});
	
	window.withHistory = new WithHistory();

	$("a.ajax").live("click", function(event) {
		event.preventDefault();
		event.stopPropagation();
		window.withHistory.pushState($(this).attr("href"));
	});

with-history.js

// WithHistory v1.0.0
// hello@withassociates.com
//
// Usage:
//   $(document).bind('WithHistory.urlDidChange', function() { ... });
//   window.withHistory = new WithHistory();
//   window.withHistory.pushState(newUrl) // push new url
//   window.withHistory.url(); // get current url

var WithHistory = function() {

  this.init = function() {
    if (this.supportsHistoryPushState()) {
      $(window).bind('popstate', $.proxy(this, 'onPopState'));
    } else {
      this.hashCheckInterval = setInterval($.proxy(this, 'onCheckHash'), 200);
    }
  },

  this.pushState = function(url) {
    if (this.supportsHistoryPushState()) {
      window.history.pushState('', '', url);
    } else {
      this.previousHash = '#' + url;
      document.location.hash = url;
    }
    this.urlDidChange();
  },

  this.supportsHistoryPushState = function() {
    return ('pushState' in window.history) &&
           window.history['pushState'] !== null;
  },

  this.onCheckHash = function() {
    if (document.location.hash != this.previousHash) {
      this.previousHash = document.location.hash;
      this.urlDidChange();
    }
  },

  this.onPopState = function() {
    this.receivedPopState = true;
    this.urlDidChange();
  },

  this.urlDidChange = function(path) {
    $(document).trigger('WithHistory.urlDidChange');
  },

  this.url = function() {
    if (this.supportsHistoryPushState()) {
      return document.location.pathname;
    } else {
      return document.location.hash.slice(1);
    }
  }

  this.init();

}