onpopstate returning data twice

I've started to play around with onpopstate but ran into a problem. Whenever I click the back button on my browser, the url does change accordingly but the page code is loaded twice so I receive two lists and two div's. Why is is it producing double the code and how do I fix it? The sample code is below.

<style type="text/css">

div {width: 200px; height: 200px; border: 1px solid;}



   <li class="sour">

   <input type="button" value="1"/>



<script type="text/javascript" >

$('ul li:nth-child(1)').click(function() {
var url = $(this).index();  
window.history.pushState('', '', 'test1.php?challenge=' + url);

window.onpopstate = function(event) {


<div id="insert">

<p>hello there</p>


Here is the contents of 1.php

<p>first file</p>

Here is a link to some screenshots I took of what visually happens. The first image is when I first load the screen. the second image is what happens when I press the button 1. The third image is what happens when I click back on my browser.



According to the problem sequence you describe, onpopstate will load the contents of test1.php into the #insert div. Since the landing page was also test1.php this will result in the duplication seen in your screenshots.

You could make this someone else's problem by using jquery-pjax. If you're not tied to jquery there are also other solutions out there that are probably easier than rolling your own.

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