javascript - How to send 2 select box dynamically generated values via ajax to get 3rd select box values -

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i'm trying 3rd select box values according first 2 select box selection (dynamic values);

jquery ajax code (it works airport select box)

$("#airport").change(function() {     var aid=$(this).val();     var datastring = 'aid='+ aid;         $.ajax         ({             type: "post",             url: "booking/findcompany.php",             data: datastring,             cache: false,             success: function(data) {                 $("#company").html(data);             }          }); });  <select name="site" id="site" class="site">     <option value="" selected="selected">select</option>     <option value="1">site one</option>     <option value="2">site two</option>     <option value="3">site three</option> </select>   <select name="airport" id="airport" class="airport">     <option value="1">airport one</option>     <option value="2">airport two</option>     <option value="3">airport three</option> </select>    <select name="company" id="company" class="company">     //options here based on above 2 selected values </select>

php code findcompany.php

<?php if($_post['aid']) {     $aid=$_post['aid'];     $site=$_post['sid']; <<<<<< how can pass id     $compsql=mysql_query("select * tbl_company air_id='$aid' , site_id='$sid'");     while($rows=mysql_fetch_array($compsql)){         $cid=$rows['comp_id'];         $cdata=$rows['comp_title']; ?>     <option value="<?php echo $cid; ?>"><?php echo $cdata; ?></option> <?php } } ?>

use $('#site').val() value of 1st select box, , add datastring. js code -

$("#airport").change(function()     {     var aid=$(this).val();     var sid=$('#site').val();     var datastring = 'aid='+ aid +'&sid='+sid;     ...

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