jquery - Ajax post request doesn't work in wp theme directory -

this example of ajax post request. work when placed outside of wordpress active theme directory. when there , norefresh.php uploaded there doesn't work no matter exact patch norefresh.php use (site/themefolder/norefresh.php or server patch or local patch norefresh.php or /norefresh.php). doesn't work @ all.

is there wordpress prevents execution.what should do?

$.ajax({  type: "post",  url: "norefresh.php",  data: reqdata,  cache: false,  success: function(html) {  //document.getelementbyid('mytextarea').value = html;  alert(html);  }  });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

you can allow access using htaccess specific file, pain clients / if move sites etc?

better hook function either plugin or theme. don't need worry relative uris. (some minor differences in js other virtually same)

add_action( 'wp_ajax_custom_hook', 'custom_function' ); add_action( 'wp_ajax_nopriv_custom_hook', 'custom_function' ); //-->front end hook...  function custom_function(){      // handle code... }  add_action('wp_head','define_ajaxurl'); //--> define ajaxurl using php can neatly place js in js file  function define_ajaxurl() {     ?>     <script type="text/javascript">     var ajaxurl = '<?php echo admin_url('admin-ajax.php'); ?>';     </script>     <?php } 

js

$.ajax({     type: "post",     url: ajaxurl, //-->see php function hooked wphead define this!!     //data: reqdata, //--> need pass action....which hook!!      data: {         action: 'custom_hook', //-->name of hook used above..ie. wp_ajax_nameofhook...         'otherfield': 'yea'     }      cache: false,     success: function(html) {     //document.getelementbyid('mytextarea').value = html;     alert(html);     } });