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    <p>If you have HTML like this:</p> <pre><code>&lt;select id='clients'&gt;...&lt;/select&gt; &lt;select id='projects'&gt;...&lt;/select&gt; </code></pre> <p>You can have jQuery code like this:</p> <pre><code>$(document).ready(function() { var $clients = $('#clients'); $clients.change(function() { var client_id = $clients.val(); $.getJSON("getProjects.php", {id: client_id}, function(projects) { $projects = $('#projects'); $projects.empty(); $.each(projects, function() { var option = $('&lt;option/&gt;').attr('value', this.id).text(this.name); $projects.append(option); }); }); }); }); </code></pre> <p>And then have getProjects.php return something like:</p> <pre><code>$sth = mysql_query( sprintf( "SELECT * FROM projects WHERE client_id = %s", mysql_real_escape_string($_GET['id']) ) ); $projects = array(); while($r = mysql_fetch_assoc($sth)) { $projects[] = array('id' =&gt; $r['id'], 'name' =&gt; $r['name']); } print json_encode($projects); exit; </code></pre> <p>I haven't tested all of this, but it is more or less what you want, I think.</p> <p><strong>edit</strong> - Tested and works, obviously it might not be exactly what you need but it gives you an idea of how to go about it. Hope it helps.</p> <p><strong>edit 2</strong> - The problem with your code is here:</p> <pre><code>$.getJSON("../inc/get-projects.php", {id: client_id}, function(projects){ projects = $('#p_id'); projects.empty(); $.each(projects, function() { var option = $('&lt;option/&gt;').attr('value', this.id).text(this.name); projects.append(option); }); }); </code></pre> <p>You are overwriting the <code>projects</code> passed into the function with the <code>projects</code> in the 2nd line. I used a <code>$</code> in my code to differentiate the two, which was admittedly perhaps not the best of ways. To fix, change the code to this:</p> <pre><code>$.getJSON("../inc/get-projects.php", {id: client_id}, function(data){ projects = $('#p_id'); projects.empty(); $.each(data, function() { var option = $('&lt;option/&gt;').attr('value', this.id).text(this.name); projects.append(option); }); }); </code></pre>
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    1. POjQuery and Auto-populat selects
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    1. USPaolo Bergantino
    1. USPaolo Bergantino
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      1. VTUpMod
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    1. CONice - way to go that extra mile!
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      1. USJarrod Dixon
    2. COWow! Thank you, let me work with this and give it a shot. Thank you so much, Ryan
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      1. USCoughlin
    3. COIts working PERFECT so far, but it is displaying p_id where it should be displaying the JSON content, the PHP loads the data correctly, but the jQuery is reading it wrong I think. p_id = ID that you gave in the example.
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