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    <p>You could use <code>jQuery.ajax()</code> and set the option <code>async</code> to false:</p> <blockquote> <p><strong>async</strong> Default: true By default, all requests are sent asynchronously (i.e. this is set to true by default). If you need synchronous requests, set this option to false. Cross-domain requests and dataType: "jsonp" requests do not support synchronous operation. Note that synchronous requests may temporarily lock the browser, disabling any actions while the request is active</p> </blockquote> <p>You could use it like this:</p> <pre><code>$.ajax({ type: "POST", url: "file.php", async: false, data: data, success: function(return){ alert("Success: "+return); } }); </code></pre> <p>If you want to add a loader just apply it as:</p> <pre><code>startLoader(); $.ajax({ type: "POST", url: "file.php", async: false, data: data, success: function(return){ alert("Success: "+return); } }); endLoader(); </code></pre> <p>However you PHP idea is simply not a good one. Opening a session and do all the process for this kind of thing is just useless and slow your script down. You should be asking yourself: Do I really need to block this?</p> <p>If the answer is yes then do this: Create a table called <code>processes</code> in you database. Inside that table create 2 fields: One will be the process identifier: <code>process_id</code>; the second will be the process status: <code>process_status</code>. The first is an integer you will define with sha1(IMAGE). The second will be an integer: <code>1</code> for "busy", <code>0</code> for "free".</p> <p>Then you could do something like this:</p> <pre><code>SELECT process_status FROM vps_processes WHERE process_id = sha1(CURRENT_IMAGE); </code></pre> <p>And check whatever it is <code>1</code> or <code>0</code>. If it is <code>1</code> then block the script; If it is <code>0</code> then you query:</p> <pre><code>UPDATE vps_processes SET process_status = 1 WHERE process_id = sha1(CURRENT_IMAGE); </code></pre> <p>then run what you have to run and at the end of the script query:</p> <pre><code>UPDATE vps_processes SET process_status = 0 WHERE process_id = sha1(CURRENT_IMAGE); </code></pre>
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    1. COBut i don't want the browser to be locked. I want my nice loading animated GIF swirling around and the user to be able to do some other things. I literally need some server-side enforcement as if I'm disabling a select few buttons.
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    2. CO@jtnire, The browser will not be blocked, It will just ignore the AJAX calls that will follow the first. Server side enforcement are really expensive. Think about it.
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    3. COIncidently, I'm using sessions for my login system as well, so the session will already exsist
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