I have developed an AJAX function within WordPress for my plugin. In the plugin construct, I am setting up the AJAX callback:
public function __construct() {
return $this->register();
}
/**
* Register all new files in WooCommerce hooks
*/
public function register() {
if ( is_user_logged_in() ) {
add_action( 'wp_ajax_filter', array( $this, 'filter' ) );
} else {
add_action( 'wp_ajax_nopriv_filter', array( $this, 'filter' ) );
}
}
Below is the jQuery function responsible for triggering the AJAX call:
jQuery(document).ready(function () {
jQuery(document).on('click', '.filter-menu li', function () {
var filter_value = jQuery(this).find('.menu-data-inner');
var data = {
'action': 'filter',
'filter': filter_value.attr('data-value'),
'filter_status': 1
};
var ajaxurl = "<?php echo admin_url( 'admin-ajax.php' ); ?>";
jQuery.post(ajaxurl, data, function () {
jQuery('#content-area').load(location.href + ' #content-area>*', '');
});
}
});
});
After making the request, I refresh the main content of WordPress through AJAX and anticipate that my function in functions.php will be skipped because of DOING_AJAX.
This is the function that is called by the AJAX request:
/**
* Filter
*/
public function filter() {
require 'functions/filter.php';
wp_die();
}
This is the content of the required file:
<?php error_log( $_POST['filter'] ); ?>
My issue now arises as I included this function in my functions.php:
add_action( 'init', 'do_something' );
function do_something() {
error_log('INIT');
}
However, it quickly became apparent that this caused a problem because the init is also triggered during AJAX requests, which is not desired. It should only display INIT when the page is loaded by pressing F5 or entering the site URL and pressing enter. So I added a condition:
add_action( 'init', 'do_something' );
function do_something() {
if ( ! wp_doing_ajax() ) {
error_log('INIT')
}
}
Even after calling the AJAX again, the debug log still shows INIT, but it shouldn't. Therefore, I attempted to modify the function that is called during AJAX like this:
<?php
error_log( $_POST['filter'] );
define( 'DOING_AJAX', true ); ?>
Unfortunately, this did not solve the problem. The error_log persists.
So what could be the issue here? What am I doing wrong? I followed the documentation, but it seems like DOING_AJAX isn't functioning as expected for me.