Why is my WordPress AJAX call returning 0?

Ajax Calls in WordPress: Troubleshooting Output Issues

Your ajax call is always returning 0 as output, leaving you perplexed about the cause. To rectify this issue, consider the following:

Global ajaxurl Variable in WordPress:

WordPress defines the global ajaxurl variable in the backend, which facilitates AJAX calls. However, this variable is not available in the frontend.

Define ajaxurl in Frontend:

To utilize AJAX calls in the frontend, you need to manually define the ajaxurl variable. One effective method is through wp_localize_script.

Using wp_localize_script:

Assuming your AJAX calls reside in my-ajax-script.js, use wp_localize_script as follows:

function my_enqueue() {
    wp_enqueue_script( 'ajax-script', get_template_directory_uri() . '/js/my-ajax-script.js', array('jquery') );
    wp_localize_script( 'ajax-script', 'my_ajax_object', array( 'ajax_url' => admin_url( 'admin-ajax.php' ) ) );
}
add_action( 'wp_enqueue_scripts', 'my_enqueue' );

This creates a my_ajax_object object in your JS file, which contains the ajax_url.

Utilize my_ajax_object in Javascript:

After localizing your script, utilize the my_ajax_object object in your JS file:

<code class="js">jQuery.ajax({
    type: "post",
    dataType: "json",
    url: my_ajax_object.ajax_url,
    data: formData,
    success: function(msg){
        console.log(msg);
    }
});</code>

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