I am trying to reload the fresh posts using jQuery. As far as I know, I can't reload the contents of a div inside the page so I reload a file into that div.

The problem is that my loaded file gives me a Fatal error: Call to undefined function wp_query()

How can I implement functions to a newly created file inside the theme directory to work properly?

This is my jQuery

<script language="JavaScript">
$(function() {
    var SANAjax = function(){

    setInterval(SANAjax, 15000 );

And this is what i have in reloadhomeposts.php (I have deleted the content though)

<?php $recent = new WP_Query("cat=3,4,5&showposts=10"); while($recent->have_posts()) : $recent->the_post();?>
<?php endwhile; ?>

2 Answers 2


The reason for this error is that your loading the file without loading in the WordPress system and so wp_query() doesnt exist.

Quick fix is to:

include("../../../wp-load.php"); <-- guessing at the location of the wordpress file.

at the top of the php file.

  • Hi Brady, I will check it soon and tell you. So wp-load loads the functions used in wordpress?
    – EnexoOnoma
    Apr 18, 2011 at 11:41
  • Working! How can I load the plugins too ?
    – EnexoOnoma
    Apr 18, 2011 at 11:50
  • 1
    Yes this loads wordpress. But you need to come up with a way to check if Wordpress is already loaded or not. For example if this is a page template then on normal load circumstances wordpress is already loaded, but not loaded when done via an ajax call.
    – Scott
    Apr 18, 2011 at 11:50
  • as for the plugins that I'm not too sure. Maybe someone else can help here. If you are dealing with a template page then maybe in your ajax call it would be better loading like this: example.com/mypage then use jquery to just grab the html you need to update. this way everything is loaded that you are going to need
    – Scott
    Apr 18, 2011 at 11:52

The correct way to handle this is to use WP's admin-ajax.php file, instead of your own. See this Codex page:


Instead of putting the code in a plugin, just put it in your functions.php file.

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