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    <p>May be you are searching for AJAX methods? E.g. you send request to some of your PHP files with GET or POST variable for your <code>key</code> (which user selects in <code>optPostAppliedFor</code>) and that PHP script <em>echo'es</em> the needed result, so JS could use it.</p> <p>For example, with jQuery this would look like this:</p> <pre><code>$("select[name=optCategory]").load("myUberScript.php", { key: $("select[name=optPostAppliedFor]").attr("selected") }); </code></pre> <p><em>myUberScript.php</em>:</p> <pre><code>&lt;?php $key = $_POST['key']; if (isset($key)) { if ($key == 'moo') echo "&lt;option&gt;moo&lt;/option&gt;"; else if ($key == 'foo') echo "&lt;option&gt;foo&lt;/option&gt;"; } ?&gt; </code></pre> <p>I think this would be the best way, but i'm really not sure with my <code>.attr("selected")</code> selector. And i recommend you to read something 'bout AJAX and jQuery - these are very useful when web-developing =)</p> <p>So, what does this JS do? It finds your <code>select</code> tag with name <code>optPostAppliedFor</code>, gets all its 'selected' items (<strong>be sure to verify that code - i am not sure about it</strong>), sends POST request to <em>myUberScript.php</em> passing that values as <code>$_POST['key']</code> argument, gets response, finds div named <code>optCategory</code> and sets its inner HTML code to PHP's response. Pretty nice, huh? =)</p> <p>I recommend this way beacause it is not always good for user to get all the internal data within javascript - user could see that data and if there is a lot of data, the page would load slooowly. Second: you can manage/edit/update/modify (choose the right one) your PHP code whenever you want. Third: PHP code has more features for secure verifying user' data and lots more. But there is one great disadvantage: if user disables JS support in his browser, you would not be able to do this sort of trick. <strong>Notice</strong>: this is a very rare case when user disables JS =)</p>
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    1. POHow to populate HTML select list using javascript
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    1. CONO I can't use ajax because I have no idea about it ...
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    2. COwell, if you do want to become a nice web-developer, you must at least know what this is and how to use it (at least, again) with jQuery or any other framework =) it is a very helpful solution sometimes =)
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    3. CO@user If you want to learn how to use AJAX with jQuery, you can find a number of helpful tutorials on it at [the jQuery website](http://docs.jquery.com/Tutorials).
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