php - Sending value, get nothing -


i created ajax function sends data php file wrong because when die it, holds nothing, , know ajax function written good. here how sending it: 

xmlhttp.send(dop);

and here how recieve in php file:

$selectedlang = isset($_post['dop']) ? $_post['dop'] : '';

what doing wrong? i'am recieving info badly. coz can see parameteres in ajax function. please help, need fast.

<script type="text/javascript">     function run()     {         var dop = document.getelementbyid("kalba").value;         return dop;     }     function insertdata()     {         var dop = run();         if (window.xmlhttprequest)         {// code ie7+, firefox, chrome, opera, safari             xmlhttp=new xmlhttprequest();         }         else         {// code ie6, ie5             xmlhttp=new activexobject("microsoft.xmlhttp");         }         xmlhttp.open("post","style/wps-light/datafile.php",true);         xmlhttp.setrequestheader("content-type","application/x-www-form-urlencoded");         xmlhttp.send("reiksme=" + encodeuricomponent(dop));     } </script>

datafile.php:

<?php $selectedlang = isset($_post['dop']) ? $_post['dop'] : ''; die("viskas ok $selectedlang");  ?>

you need that:

$selectedlang = isset($_post['reiksme']) ? $_post['reiksme'] : '';

because reiksme key in $_post array, not dop:

xmlhttp.send("reiksme=" + encodeuricomponent(dop));               ^^^^^^^

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