WordPress ajax-action how to return content

Question

So I'm trying to set up an AJAX action for a plugin I'm building.

When using /wp-admin/admin-ajax.php?action=beacon_podio-get_apps

I was just getting hello world0 and I'm not seeing Request is valid or the Invalid request so it seems like the action is not being called

I think I'm missing something but I'm not sure what I'm missing.

class testClass {

    public function __construct(){
        echo "hello world";
        add_action('wp_ajax_beacon_podio-get_apps', array($this, "get_apps"));
    }

    public function get_apps(){
        if(isset($_POST['app_id'])){
            $app_id = $_POST['app_id'];
            die("Request is valid");
        }else{
            die("Invalid request");
        }
    }
}
new testClass();

I have been reading https://codex.wordpress.org/AJAX_in_Plugins but it's missing the URL I'm supposed to be using.

Answer 1

OK, so you misunderstood it a little bit, I guess...

You do the first part correctly. So yes - AJAX requests should be sent to wp-admin/admin-ajax.php and the should have action param set in the request (either as a POST or as a GET).

But then, you do it wrong. You register your action with this code:

add_action('beacon_podio-get_apps', array($this, "get_apps"));

But id should be:

add_action('wp_ajax_beacon_podio-get_apps', array($this, "get_apps"));

or (for anonymous users)

add_action('wp_ajax_nopriv_beacon_podio-get_apps', array($this, "get_apps"));

So just to make it clear - the correct hooks are:

• wp_ajax_(action)
• wp_ajax_nopriv_(action)

where (action) is the action that you sent as action parameter.

Answer 2

This appeared to be a bug in WordPress, coming back to this and upgrading to version 5.2 the problem seems to have been fixed for some reason the has_action was failing to find the action unsure why but it seems to have been fixed.