1

I'm making an ajax request from my primary domain to a subdomain. I've solved my cross origin issues so I'm not getting an error. The call is returning data:0. I've checked my response config and the ajax url is correct as well as "action". My functions.php looks like this:

add_action("wp_ajax_sendhire", "sendhire");
add_action("wp_ajax_nopriv_sendhire", "sendhire");

function sendhire() {

    $cars = array("Volvo", "BMW", "Toyota");
    return json_encode($cars);
    die();

}

The data, obviously, is just for testing.

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  • echo doesn't change the response. The will eventually process data being passed to it not return anything. Maybe a success/error message but that's about it.
    – dcp3450
    Jul 31, 2017 at 4:37

2 Answers 2

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If you want to use Admin-Ajax to output the content, you should use echo instead. There is nothing to be viewed when you use return, so you'll get a 0.

This quotation from the codex explains further about the 0 response:

If the Ajax request fails in wp-admin/admin-ajax.php, the response will be -1 or 0, depending on the reason for the failure. Additionally, if the request succeeds, but the Ajax action does not match a WordPress hook defined with add_action('wp_ajax_(action)', ...) or add_action('wp_ajax_nopriv_(action)', ...), then admin-ajax.php will respond 0.

Now, if you are going to output a JSON response, you should take a look into the REST API. Its default response type is JSON.

To do so, register a path for the endpoint, and create a callback function:

add_action( 'rest_api_init', function () {
    register_rest_route( 'dcp3450', '/test_endpoint/', array(
            'methods' => 'GET', 
            'callback' => 'sendhire' 
    ) );
});

function sendhire() {

    $cars = array("Volvo", "BMW", "Toyota");
    return $cars;

}

Now by accessing http://example.com/wp-json/dcp3450/test_endpoint/ you will get your JSON response, and you can get rid of this annoying 0 that is following humanity to its end.

10
  • I'm using the REST API for the site currently to pull data using WP as a headless cms. I'm attempting to use the ajax call to process a form.
    – dcp3450
    Jul 31, 2017 at 4:40
  • I've tried your code, and it works with echo, but outputs 0 with return. The Admin-Ajax must echo the content if you are trying to send it to the browser.
    – Johansson
    Jul 31, 2017 at 4:43
  • I wonder if there is an issue with me making a call to a subdomain?
    – dcp3450
    Jul 31, 2017 at 4:44
  • I can't tell since you didn't include any details about that. But to mention again, you will always get the 0 if you return the data, since there is nothing to be displayed.
    – Johansson
    Jul 31, 2017 at 4:45
  • I changed return to echo but I still get 0.
    – dcp3450
    Jul 31, 2017 at 4:46
0

WordPress have a very useful API (REST API) for this work, you can use it, instead of sending ajax request. Here is the documentation have a look please https://developer.wordpress.org/rest-api/

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