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Ah yes, the ol' admin-ajax error 400 issue. I have looked here and here and here for a solution and none of those fixed my problem. So before this is marked as a duplicate, please just hear me out.

My admin-ajax link looks like so:

<script type="text/javascript">
   var ajaxurl = "https://full-url.com/wp-admin/admin-ajax.php";
</script>

My AJAX call looks like this:

var data = {
    action: 'get_events'
};

jQuery.ajax({
  url: ajaxurl,
  data: data,
  type: 'POST',
  success: function(data){ 
    console.log(data);
  },
  error: function(xhr, ajaxOptions, thrownError) {
    console.log(xhr);
    console.log(xhr.status);
    console.log(thrownError);
  }
});

And inside my functions.php, I have the following:

add_action('get_events', 'get_events_func');
add_action('wp_ajax_nopriv_get_events', 'get_events_func');

function get_events_func() {

    echo 'please work';
    exit(); 
    
}

This works perfectly fine when I am logged out of the website, but once I am logged in, it throws an error 400. Did I set up that wp_ajax_nopriv_ hook wrong? That's the only thing I can think of.

The error response I am getting is simply:

XMLHttpRequest {readyState: 4, timeout: 0, withCredentials: false, abort: ƒ, onreadystatechange: ƒ, …}
abort: ƒ ()
onabort: null
onerror: null
onload: null
onloadend: null
onloadstart: null
onprogress: null
onreadystatechange: ƒ ()
ontimeout: null
readyState: 4
response: "0"
responseText: "0"
responseType: ""
responseURL: "https://full-url.com/wp-admin/admin-ajax.php"
responseXML: null
status: 400
statusText: ""
timeout: 0
upload: XMLHttpRequestUpload {onloadstart: null, onprogress: null, onabort: null, onerror: null, onload: null, …}
withCredentials: false
__proto__: XMLHttpRequest

400

undefined

Any help is really appreciated. Thank you.

3
  • 1
    Are you sure you've carefully reviewed those linked answers? Because that add_action('get_events', should be add_action('wp_ajax_get_events', .. – Sally CJ May 15 at 0:39
  • @SallyCJ o. m. g. If you put this as answer, I'll mark it as the solution. I've never felt so dumb. Thank you. – Kenton de Jong May 15 at 5:16
  • It's alright, everyone makes mistakes.. =) And I've posted an answer, but you should, specially if you're just starting out with admin-ajax.php, consider using the REST API instead. It's well-documented and you can do things like retrieving Posts, Pages, CPT posts, custom taxonomy terms, etc. What's more, you'd get a better response body/text (well, at least it's not simply a 0..) when an error is encountered during an API request, so debugging would become easier than with the ol' admin-ajax.php.. :) – Sally CJ May 15 at 8:03
2

Did I set up that wp_ajax_nopriv_ hook wrong?

No, you did not. But that hook is for logged-out or unregistered users only.

For logged-in users, the hook is wp_ajax_<action>.

So you just need to change the add_action('get_events' in your code to add_action('wp_ajax_get_events', and the error 400 would be gone:

add_action('wp_ajax_get_events', 'get_events_func');        // for logged-in users
add_action('wp_ajax_nopriv_get_events', 'get_events_func'); // for logged-out users

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