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    <p>As I understand your question , It's a common problem since the AJAX is asynchronous</p> <p>You can avoid the problem in two ways </p> <p><strong>1 - Setting the <code>async</code> Parameter to false</strong> </p> <pre><code>$(document).ready(function(){ $(window).scroll(function(){ /* window on scroll run the function using jquery and ajax */ var WindowHeight = $(window).height(); /* get the window height */ if($(window).scrollTop() +1 &gt;= $(document).height() - WindowHeight){ /* check is that user scrolls down to the bottom of the page */ $("#loader").html("&lt;img src='loading_icon.gif' alt='loading'/&gt;"); /* displa the loading content */ var LastDiv = $("#tabsul&gt;li:last"); /* get the last div of the dynamic content using ":last" */ var LastId = $("#tabsul&gt;li:last").attr("id"); /* get the id of the last div */ var offset = $("#tabsul&gt;li").length; //thats the size we have var ValueToPass = "Id="+ LastId; $.ajax({ /* post the values using AJAX */ type: "GET", url: "&lt;?= url('pages/ajax/All/')?&gt;"+offset+"/", data: ValueToPass, cache: false, async:false, success: function(html){ $("#loader").html(""); LastDiv.after(html); } }); } }); }); </code></pre> <p><strong>2 - Using boolean flags</strong> </p> <pre><code>var flag = true; $(document).ready(function(){ $(window).scroll(function(){ /* window on scroll run the function using jquery and ajax */ var WindowHeight = $(window).height(); /* get the window height */ if($(window).scrollTop() +1 &gt;= $(document).height() - WindowHeight){ /* check is that user scrolls down to the bottom of the page */ $("#loader").html("&lt;img src='loading_icon.gif' alt='loading'/&gt;"); /* displa the loading content */ var LastDiv = $("#tabsul&gt;li:last"); /* get the last div of the dynamic content using ":last" */ var LastId = $("#tabsul&gt;li:last").attr("id"); /* get the id of the last div */ var offset = $("#tabsul&gt;li").length; //thats the size we have var ValueToPass = "Id="+ LastId; if(flag == true) { flag = false; $.ajax({ /* post the values using AJAX */ type: "GET", url: "&lt;?= url('pages/ajax/All/')?&gt;"+offset+"/", data: ValueToPass, cache: false, success: function(html){ $("#loader").html(""); LastDiv.after(html); flag = true; } }); } } }); }); </code></pre> <p>In this model you set a variable to be true when it's done from the previous request </p> <p>Maybe you need to change the condition of the if statement if you want </p> <p>I hope this can help</p>
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