jquery - Response not received from ajax request in php -

i have page there table , each row has icon detailed information. when icon clicked, unique identifier row datastring , send ajax request. response cannot catch correct response. why doing wrong? need access $desc in home.php , how catch in response ?

home.php

$.ajax({         type: "post",         url: "actionone.php",         data: datastring,         cache: true,           success:function() {         alert("success");      } }); 

actionone.php

if(isset($_post['content'])) { $content=(int)$_post['content']; $fetch = mysql_query("select issuedescription issues kbid =$content"); while($rowe = mysql_fetch_array($fetch))     {        $desc = $rowe['issuedescription']; }  

for ajax success work output php code ie change php code to

if(isset($_post['content'])) {     $content=(int)$_post['content'];     $fetch = mysql_query("select issuedescription issues kbid =$content");     while($rowe = mysql_fetch_array($fetch))         {             $desc = $rowe['issuedescription'];     }     echo $desc; } 

jquery

$.ajax({         type: "post",         url: "actionone.php",         data: datastring,         cache: true,           success:function(data) {         alert(data.trim());      } });