Le fichier functions.php est-il jamais appelé lors d'un appel AJAX?Déboguer AJAX

admin-ajax.php charge wp-load.php:

 /** Load WordPress Bootstrap */
require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
 

wp-load.php charge wp-config.php,et là wp-settings.phpest chargé.

Etnoustrouvonsici ceci:

 // Load the functions for the active theme, for both parent and child theme if applicable.
if ( ! defined( 'WP_INSTALLING' ) || 'wp-activate.php' === $pagenow ) {
    if ( TEMPLATEPATH !== STYLESHEETPATH && file_exists( STYLESHEETPATH . '/functions.php' ) )
        include( STYLESHEETPATH . '/functions.php' );
    if ( file_exists( TEMPLATEPATH . '/functions.php' ) )
        include( TEMPLATEPATH . '/functions.php' );
}
 

Donc,oui,le functions.php duthèmeest chargé.

Il y a uneexception dans wp-settings.php:

 // Stop most of WordPress from being loaded if we just want the basics.
if ( SHORTINIT )
    return false;
 

Lorsque SHORTINITest défini comme TRUEplustôt,lethèmene serapas chargé.

Vérifiez donc si SHORTINITest TRUEpour une raison quelconque.

Une autreerreur couranteest lamauvaise utilisation de is_admin(). C'esttoujours TRUE dans admin-ajax.php,donc ce qui suit échouera:

 if ( ! is_admin() )
    // register or execute AJAX stuff
 

Débogage AJAX

Uneméthode aussiprimitive qu'efficace consiste à utiliser l'en-tête HTTPpour déboguer AJAX.

Voici une simplefonction d'aide:

 function send_debug_header( $msg )
{
    static $counter = 1;
    header( "X-Debug-Ajax-$counter: $msg" );
    $counter += 1;
}
 

Et cepluginmontre comment l'utiliser:

 <?php # -*- coding: utf-8 -*-
/**
 * Plugin Name: Debug AJAX per HTTP
 * Description: Look at the HTTP headers in your browser's network console
 */

// The constant is already defined when plugins are loaded.
// Prove we have been called.
if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
    send_debug_header( 'File "' . __FILE__ . '" was called on an AJAX request.' );

function send_debug_header( $msg )
{
    static $counter = 1;
    header( "X-Debug-Ajax-$counter: $msg" );
    $counter += 1;
}

add_action( 'wp_ajax_debug_test',        't5_debug_test' );
add_action( 'wp_ajax_nopriv_debug_test', 't5_debug_test' );

function t5_debug_test()
{
    $in = is_user_logged_in() ? '' : 'not ';
    send_debug_header( 'Function "' . __FUNCTION__ . '" was called and the user is ' . $in . 'logged in.' );
    print_r( debug_backtrace() );
    die(1);
}

add_action( 'wp_enqueue_scripts', 't5_enqueue_jquery' );

function t5_enqueue_jquery()
{
    wp_enqueue_script( 'jquery' );
}
add_action( 'wp_footer', 't5_debug_ajax_test_button', 0 );

function t5_debug_ajax_test_button()
{
    ?>
<input type="submit" id="t5debugajax" value="Debug AJAX">
<script>
jQuery( function($){
    var sendFeedBack = function( response ){
        console.log( response );
    };
    $("#t5debugajax").on("click", function(){
        $.post(
            "<?php echo admin_url( 'admin-ajax.php' ); ?>",
            {
                action: "debug_test"
            },
            sendFeedBack
        );
    });
});
</script>
    <?php
}
 

Cela ajoutera unbouton aufrontal qui déclenchera une requête AJAX lorsque l'utilisateur cliquera dessus. Ouvrez la console réseau de votrenavigateuret regardez lesen-têtes de réponsepour la demande:

admin-ajax.php loads wp-load.php:

/** Load WordPress Bootstrap */
require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );

wp-load.php loads wp-config.php, and there wp-settings.php is loaded.

And here we find this:

// Load the functions for the active theme, for both parent and child theme if applicable.
if ( ! defined( 'WP_INSTALLING' ) || 'wp-activate.php' === $pagenow ) {
    if ( TEMPLATEPATH !== STYLESHEETPATH && file_exists( STYLESHEETPATH . '/functions.php' ) )
        include( STYLESHEETPATH . '/functions.php' );
    if ( file_exists( TEMPLATEPATH . '/functions.php' ) )
        include( TEMPLATEPATH . '/functions.php' );
}

So, yes, the theme’s functions.php is loaded.

There is one exception in wp-settings.php:

// Stop most of WordPress from being loaded if we just want the basics.
if ( SHORTINIT )
    return false;

When SHORTINIT is defined as TRUE earlier, the theme will not be loaded.

So check if SHORTINIT is TRUE for some reason.

Another common error is the wrong usage of is_admin(). This is always TRUE in admin-ajax.php, so the following will fail:

if ( ! is_admin() )
    // register or execute AJAX stuff

Debugging AJAX

One method as primitive as efficient is using HTTP header to debug AJAX.

Here is a simple helper function:

function send_debug_header( $msg )
{
    static $counter = 1;
    header( "X-Debug-Ajax-$counter: $msg" );
    $counter += 1;
}

And this plugin shows how to use it:

<?php # -*- coding: utf-8 -*-
/**
 * Plugin Name: Debug AJAX per HTTP
 * Description: Look at the HTTP headers in your browser's network console
 */

// The constant is already defined when plugins are loaded.
// Prove we have been called.
if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
    send_debug_header( 'File "' . __FILE__ . '" was called on an AJAX request.' );

function send_debug_header( $msg )
{
    static $counter = 1;
    header( "X-Debug-Ajax-$counter: $msg" );
    $counter += 1;
}

add_action( 'wp_ajax_debug_test',        't5_debug_test' );
add_action( 'wp_ajax_nopriv_debug_test', 't5_debug_test' );

function t5_debug_test()
{
    $in = is_user_logged_in() ? '' : 'not ';
    send_debug_header( 'Function "' . __FUNCTION__ . '" was called and the user is ' . $in . 'logged in.' );
    print_r( debug_backtrace() );
    die(1);
}

add_action( 'wp_enqueue_scripts', 't5_enqueue_jquery' );

function t5_enqueue_jquery()
{
    wp_enqueue_script( 'jquery' );
}
add_action( 'wp_footer', 't5_debug_ajax_test_button', 0 );

function t5_debug_ajax_test_button()
{
    ?>
<input type="submit" id="t5debugajax" value="Debug AJAX">
<script>
jQuery( function($){
    var sendFeedBack = function( response ){
        console.log( response );
    };
    $("#t5debugajax").on("click", function(){
        $.post(
            "<?php echo admin_url( 'admin-ajax.php' ); ?>",
            {
                action: "debug_test"
            },
            sendFeedBack
        );
    });
});
</script>
    <?php
}

It will add a button to the front end that triggers an AJAX request when clicked. The open your browser’s network console and look at the response headers for the request:

Je suppose que votreproblème était qu'AJAXfonctionnait si vous êtes connectéet qu'ilne fonctionnaitpasen statut déconnecté,n'est-cepas?
Ilexiste unefonction dans WordPresspour accéder auxfichiers AJAXpour les utilisateursnon connectés: wp_ajax_nopriv,parexemple

 /* works for logged users */
add_action( 'wp_ajax_my_action', 'my_action_callback');

/* works for non logged users */
add_action( 'wp_ajax_nopriv_my_action', 'my_action_callback');
 

I assume your problem was AJAX was working if your are logged in and it was not working in logged out status, right?
There is a function in WordPress to access AJAX-based files for non logged users: wp_ajax_nopriv, for example

/* works for logged users */
add_action( 'wp_ajax_my_action', 'my_action_callback');

/* works for non logged users */
add_action( 'wp_ajax_nopriv_my_action', 'my_action_callback');