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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
## 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
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:
## install it
$ cd path/to/js
$ curl -O
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'.
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