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    <p>The problem is that in some cases the first PHP script has not finished running before you click the button that loads the second PHP script (like I implied before in my comment). The fact that this happens is related to how scripts are scheduled by the webserver (which is a different subject entirely).</p> <p>You thus need to make sure that when you click the button that runs the second script, the first script has completely finished running. </p> <p>Because in my knowledge, javascript does not allow blocking/signaling on a variable (like Java does), you'll have to use a more 'dirty' technique called busy waiting.</p> <p>The best way to do this, is to include an extra variable in the javascript you are using.</p> <pre><code>var wait = false; function reloadSecond (){ if (wait){ setTimeout('reloadSecond()',200); } else { $("#div").load('second.php'); } } $(".userdata").click(function() { wait = true; $.post("first.php", $("form#checkboxes").serialize(), function(){ wait = false; }); }); $(function() { $("#button").click(reloadSecond); }) </code></pre> <p>While 'busy waiting' is generally not considered the most elegant solution, I think you don't have many other options in this case (except for serverside push, which is much more complicated). Additionally, you'll probably only incur the extra 200 millisecond (or less, you can of course change this value) waiting time once or twice.</p> <p>(side note: I assume that javascript is single threaded here, which is true in almost all cases: <a href="https://stackoverflow.com/questions/2734025/is-javascript-guaranteed-to-be-single-threaded">Is JavaScript guaranteed to be single-threaded?</a>).</p> <p>Hope this helps!</p>
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    1. COThank you, that was helpful and I understand what is going on better now. While waiting for your reply, I placed the div update inside the success callback and that seems to have fixed the issue. Do you think the 'busy waiting' is necessary when just having it inside the callback seems to be working properly?
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    2. COI think it is. If you place the click handler that calls the div update inside the callback, it will only work after the callback is called. This means that if you click the button that calls the second PHP script (#button) before the callback is called, nothing will happen. This will result in the same behavior that you experienced before (the second button works in most cases, but in some cases - if server side scheduling is not chronological - it won't).
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    3. COI made the post button and the update button the same button. I used $.ajax() to post the data and then put the div update in the success callback. Am I correct in thinking that the success code will only run when the PHP script is finished?
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