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I'm currently developing a plugin that uses ajax functionality.

Problem: The callback isn't fired = no data gets processed.

if ( ! is_admin() )
    add_action( 'after_setup_theme', array( 'wpseAjaxClass', 'init' ), 10 );
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Last time I had this issue was due to the callback function not actually being accessible during the AJAX request. For example, I buried the call to instantiate the class under a function like is_single(). It was called when the page was being viewed, but not when the AJAX request was made. I see that one of your comments says the code is part of the class. Any chance you can show the rest of the class? – tollmanz Feb 6 '12 at 5:17
@tollmanz Thanks for the comment. jQuery mobile loads everything with one request, so basically it's like a js-slider/-carousel. The my_action_cb() fn itself isn't hidden behind something. Just sits right in the middle of the class. As shown in the, the enqueue happens right in the __construct() of the class. I added a screenshot from the console. Please see Edit. Any other ideas? – kaiser Feb 6 '12 at 5:44
Sorry to harp on this, but clearly the script cannot find the function. How is the class itself instantiated? When I have these issues, it's usually something little that I've missed. I'd love to look over the code to see if I could spot something. – tollmanz Feb 6 '12 at 5:58
Ok :) Here's a pastebin. Tell me if the link isn't working. (And thanks for taking the time). – kaiser Feb 6 '12 at 6:00
1  
To be more clear, I created this revised pastebin based on your pastebin: pastebin.com/r0Ud14aB – tollmanz Feb 6 '12 at 6:11
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1 Answer

up vote 2 down vote accepted

The answer was as stupid as simple: I wrapped the init for the class in a ! is_admin() call. This successfully prevented the callback from beeing fired.

Rule for AJAX loading

  • Load it in public
  • Don't hide it behind a ! is_admin() call.

The 2nd line from admin-ajax.php

define( 'WP_ADMIN', true );
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2  
I knew it was going to be something like this. Whenever I get the dreaded "0" response with WP AJAX, I instantly think that my function is inaccessible! Congrats on finding the issue and getting your life back ;) – tollmanz Feb 7 '12 at 3:43
:) Thanks for this comment. I'm currently more than angry about this issue and writing on wp-hackers :P – kaiser Feb 7 '12 at 3:48

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