refresh sub category combo box in php ?

Posted by user298146 on Stack Overflow See other posts from Stack Overflow or by user298146
Published on 2010-03-20T20:13:55Z Indexed on 2010/03/20 22:21 UTC
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php

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combobox

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refresh

Hello

i need to refresh combo box (sub category ) related to what i choose in main category combo box , for example if i choose "chicken" in main category , the value of sub category will be "grilled chicken" , " fried chicken " ? how should i do this ?

    <select name="categorylist" id="categorylist">
    <?
    $sql_query= mysql_query("select category_id,category_name, from categories");
    while($fetch= mysql_fetch_array($sql_query)) 
    {   ?>

      <option value= " <? echo "$fetch[category_id];" ?> " selected="selected"><? echo "$fetch[category_name]"; ?> </option>
     <? 
    }
     ?>

what should i put in subcategory ?

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