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POPopulate another select dropdown from database based on dropdown selection
 

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    <p>I am building a website to learn coding and am trying to build a tool where a user clicks on a select/dropdown that contains some category names pulled from database <strong>cat</strong> and then another select will appear with subcategory names pulled from database <strong>subcat</strong>. This is almost exactly like Yelp's (go down to the categories) <a href="http://www.yelp.com/biz_attribute?biz_id=Jsuy0DN6NhILXSkHr6UpCA" rel="noreferrer">like Yelp's (go down to the categories)</a>.</p> <p>I also made a diagram:</p> <p><img src="https://i.stack.imgur.com/2dtlp.png" alt="enter image description here"></p> <p>I already have a category dropdown that is pulling from <strong>cat</strong> database:</p> <pre><code>&lt;p&gt;&lt;b&gt;Category:&lt;/b&gt;&lt;br /&gt; &lt;?php $query="SELECT id,cat FROM cat"; $result = mysql_query ($query); echo"&lt;select name='cselect3' class='e1'&gt;&lt;option value='0'&gt;Please Select A Category&lt;/option&gt;"; // printing the list box select command while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt echo "&lt;option value=\"".htmlspecialchars($catinfo['cat'])."\"&gt;".$catinfo['cat']." &lt;/option&gt;"; } echo"&lt;/select&gt;"; ?&gt; </code></pre> <p>And I have a subcat that is pulling from subcat database:</p> <pre><code>&lt;p&gt;&lt;b&gt;Subcat1:&lt;/b&gt;&lt;br /&gt; &lt;?php $query="SELECT id,subcat FROM subcat"; $result = mysql_query ($query); echo"&lt;select name='sselect1' class='e1'&gt;&lt;option value='0'&gt;Please Select A Category&lt;/option&gt;"; // printing the list box select command while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt echo "&lt;option value=\"".htmlspecialchars($catinfo['subcat'])."\"&gt;".$catinfo['subcat']."&lt;/option&gt;"; } echo"&lt;/select&gt;"; ?&gt; </code></pre> <p>How do I make a subcategory dropdown based on what the user clicks on category and make it automatically appear? Thanks so much for any and all help!</p>
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