Fatal error when getting the results using jQuery and Wordpress

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. (Is that correct?)

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

How can I implement functions 开发者_如何学Cto a newly created file inside the theme directory to work properly?

This is my jQuery

<script language="JavaScript">
$(function() {
    var SANAjax = function(){
        $('#reservationdetails').empty().addClass('loading')
          .load('wp-content/themes/theme/reloadhomeposts.php', function() {
             $(this).removeClass('loading') 
          });
    }
    setInterval(SANAjax, 15000 );
});
</script>
<div id="reservationdetails"></div>

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; ?>

---

You should be fine (about the WP functionality you are missing) if you add this to your reloadhomeposts.php file before you call any WP function:

require('../../../wp-blog-header.php');
// ... WP_Query call and loop

---

You're probably getting that error because you are calling the theme file directly

OR

because you aren't incuding the header and footer of the page.

Easy Solve:

Make sure the page loads as wanted. If you dont want to include the header and all that junk, you can load a fragment with jQuery doing something like this:

  .load('wp-content/themes/theme/reloadhomeposts.php #postWrapper', function() {
             $(this).removeClass('loading') 
    });

---

Your AJAX can call /wp-admin/admin-ajax.php , with an action parameter (and whatever you want), then in a plugin file you can associate your ajax call to :

add_action('wp_ajax_YOUR_ACTION_NAME', 'the_function_to_call');
add_action('wp_ajax_no_priv_YOUR_ACTION_NAME', 'the_function_to_call');

YOUR_ACTION_NAME must be the value of the action parameter. The first one, is a public ajax request, means you can call it even if your not logged in The second one, need that you're logged on.

Then the function the_function_to_call can include whatever, it will works !

function the_function_to_call () {
    include (TEMPLATEPATH . '/reloadhomeposts.php');
    die(); // prevent string 1 to appear after
}

A little complicated but you are using WP internals process for AJAX.