I hope someone can advise me on the best way to diagnose what is causing my Ajax calls to /wp_admin/admin-ajax.php to be re-directed to my site’s homepage. I’m writing a new custom plugin for our site, following the pattern of another (working) plugin that uses admin-ajax. The existing plugin is working fine, but my new plugin’s calls to admin-ajax always get re-directed home.

I’ve spent hours researching this, and have already corrected what seemed the most likely culprit. We have a login-re-direct plugin that sends users to the right landing page based on their role, so I updated that to include a test for DOING_AJAX before running the re-direct logic, but that did not help:

if (is_admin() || !$post || DOING_AJAX) { return; }

I can see in the browser that my Ajax call is happening, and I see the 302 re-direct to our home page.

Here’s my PHP and JS code for completeness’ sake:

    function updateAvailability(e){
        var active_select = document.getElementById("availability_" + e);
        var newAvailability = active_select.value;
        var respJSON = "";
        console.log('display_user_company_products updating availability for product: ' + e + ' to : ' + newAvailability);
        jQuery.ajax({
             type : "post",
             dataType : "json",
             url : "https://xxxxxx/wp_admin/admin-ajax.php",
             data : {'action': 'update_product_master', 'product_id': e, 'attribute': 'current_availability', 'value': newAvailability, },
             success: function(response) {
                respJSON = JSON.stringify(response);
                console.log('display_user_company_products AJAX call returned : ' + respJSON);
                if(response.type == "success") {
                   alert("Thank you for updating your info!");
                }
                else {
                respJSON = JSON.stringify(response);
                   alert("Your update could not be processed");
                }
             }
        });
    }

// Create admin-ajax function to update product master attributes based on call from B2B Portal
add_action("wp_ajax_update_product_master", "ajax_update_product_master",1);
add_action("wp_ajax_nopriv_update_product_master", "ajax_update_product_master",1);
function ajax_update_product_master() {
    if (!$product_id) {
        $product_id = isset($_POST['product_id'])?$_POST['product_id']:isset($_GET['product_id'])?$_GET['product_id']:0;
    }
    if (!$attribute) {
        $attribute = isset($_POST['attribute'])?$_POST['attribute']:isset($_GET['attribute'])?$_GET['attribute']:0;
    }
    if (!$value) {
        $value = isset($_POST['value'])?$_POST['value']:isset($_GET['value'])?$_GET['value']:0;
    }
    error_log("Function ajax_update_product_master updating product master : ".$product_id." attribute : ".$attribute." with value : ".$value);
    $result = array('success'=> 1,
                    'message'=>'Function ajax_update_product_master updating product master '.$cigar_id.' attribute '.$attribute.' with value '.$value);
    return json_encode($result);
}

I’m completely stumped why admin-ajax never runs my php function above, but instead re-directs my call to our homepage. Can anyone suggest a methodical process for me to diagnose what code is causing these re-directs?

Thanks in advance…

I tried the code included above, and was expecting my PHP function ajax_update_product_master to be executed by WP admin-ajax, but instead received a 302 re-direct to homepage.