jquery - Ajax not working on select tag, PHP, AJAX -

i'm trying use ajax on select tag 2 options, it's not getting $_post reason. prints out "---", not print out $_post value, either 1 or 2. i'm not sure did wrong. please take @ code:

newtest.php

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>  <script type = "text/javascript">   function ajax(url,type,thename,id) {        $.ajax({            type: "post",            url: url,            data: { select: $(type+'[name='+thename+']').val()},            error: function(xhr,status,error){alert(error);},            success:function(data) {              document.getelementbyid( id ).innerhtml = data;            }        });  }  </script>  <?php  echo "<select name = 'name' onchange = 'ajax(\"newtestx.php\",\"input\",\"name\",\"output\")'>"; echo "<option value = '1'> 1 </option>"; echo "<option value = '2'> 2 </option>"; echo "</select>";  echo "<div id = 'output'></div>";  ?> 

newtestx.php

<?php  $name = $_post['name']; echo $name."---";  ?> 

you sending post parameter key "select" server in ajax call:

   data: { select: $(type+'[name='+thename+']').val()}, 

in newtestx.php trying retrieve value post parameter key "name" - doesn't exist:

$name = $_post['name']; 

you fix giving parameter keys same name. if $name = $_post['select'] parameter found.

inline javascript considered bad practice , there's no need echo out html markup, makes mark harder work with.

newtest.php

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> <script src="[link javascript file here]"></script> <select name='numbers' class="postvalueonchange" data-id-to-update="output" data-post-url="newtestx.php">     <option value='1'>1</option>     <option value='2'>2</option> </select> <div id='output'></div> 

javascript file

$(document).ready(function () {     $('.postvalueonchange').change(postselectedvalue);      function postselectedvalue(e) {         var $self = $(this);         var url = $self.data('post-url');         var $elementtoupdate = $('#' + $self.data('id-to-update'));          var jqxhr = $.ajax({             type: "post",             url: url,             data: {                 selected: $self.val()             }         });         jqxhr.done(function (data) {             $elementtoupdate.html(data);         });         jqxhr.fail(function (jqxhr, textstatus, errorthrown) {             alert(errorthrown);         });     } }); 

newtestx.php

<?php $name = $_post['selected']; echo $name."---"; ?>