pushState + ajax = pjax (for Zepto.js)
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## pushState + ajax = pjax

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## what is it?

pjax loads HTML from your server into the current page
without a full reload. It's ajax with real permalinks,
page titles, and a working back button that fully degrades.

pjax enhances the browsing experience - nothing more.

You can find a demo at http://pjax.heroku.com/

## three ways to pjax on the client side:

1. Functionally obtrusive, loading the href with ajax into data-pjax:

   <a href='/explore' data-pjax='#main'>Explore</a>


2. Slightly obtrusive, passing a container and jQuery ajax options:

   <a href='/explore' class='js-pjax'>Explore</a>

   $('a.js-pjax').pjax('#main', { timeout: null, error: function(xhr, err){
     $('.error').text('Something went wrong: ' + err)

3. Unobtrusive, showing a 'loading' spinner:

   <div id='main'>
     <div class='loader' style='display:none'><img src='spin.gif'></div>
     <div class='tabs'>
       <a href='/explore'>Explore</a>
       <a href='/help'>Help</a>

   $('a').pjax('#main').live('click', function(){

## $(link).pjax( container, options )

The $(link).pjax() function accepts a container, an options object,
or both. The options are the same as jQuery's $.ajax options with the
following additions:

        container - The selector of the container to load the reponse body into, or
                    the container itself.
   clickedElement - The element that was clicked to start the pjax call.
             push - Whether to pushState the URL. Defaults to true (of course).
          replace - Whether to replaceState the URL. Defaults to false.
          timeout - pjax sets this low, <1s. Set this higher if using a custom
                    error handler. It's in ms, so something like `timeout: 2000`
            error - By default this callback reloads the target page once `timeout`
                    ms elapses.

## $.pjax( options )

You can also just call $.pjax directly. It acts much like $.ajax, even
returning the same thing and accepting the same options.

The pjax-specific keys listed in the $(link).pjax() section work here
as well.

This pjax call:

    url: '/authors',
    container: '#main'

Roughly translates into this ajax call:

    url: '/authors',
    dataType: 'html',
    beforeSend: function(xhr){
      xhr.setRequestHeader('X-PJAX', 'true')
    success: function(data){
      history.pushState(null, $(data).filter('title').text(), '/authors')

## pjax on the server side

You'll want to give pjax requests a 'chrome-less' version of your page.
That is, the page without any layout.

As you can see in the "ajax call" example above, pjax sets a custom 'X-PJAX'
header to 'true' when it makes an ajax request to make detecting it easy.

In Rails, check for `request.headers['X-PJAX']`:

  def my_page
    if request.headers['X-PJAX']
      render :layout => false

Django: https://github.com/jacobian/django-pjax

Asp.Net MVC3: http://biasecurities.com/blog/2011/using-pjax-with-asp-net-mvc3/

## page titles

Your HTML should also include a <title> tag if you want page titles to work.

## events

pjax will fire two events on the container you've asked it to load your reponse
body into:

* start.pjax - Fired when a pjax ajax request begins.
* end.pjax   - Fired when a pjax ajax request ends.

This allows you to, say, display a loading indicator upon pjaxing:

    .bind('start.pjax', function() { $('#loading').show() })
    .bind('end.pjax', function() { $('#loading').hide() })

## browser support

pjax only works with browsers that support the history.pushState API.

For a table of supported browsers see: http://caniuse.com/#search=pushstate

## install it

  $ cd path/to/js
  $ curl -O https://github.com/defunkt/jquery-pjax/raw/master/jquery.pjax.js

Then, in your HTML:

  <script src="path/to/js/jquery.pjax.js"></script>

Replace 'path/to/js' with the path to your JavaScript directory,
e.g. 'public/javascripts'.