I've built a function within a plugin. I'd like to call it with an jQuery ajax function.

The function is defined as follows:

add_action( 'wp_ajax_my_test_ajax', 'my_test_ajax' );
add_action( 'wp_ajax_nopriv_my_test_ajax', 'my_test_ajax' );

function  my_test_ajax() {    

    $resp = array('title' => 'here is the title', 'content' => ' here is the content') ;        
    wp_send_json($resp) ;


I then attempt to call the function with from javascript:

var target = 'http://'  +  window.location.hostname  + '/wp-admin/admin-ajax.php' ;
var data = {
    action: ' my_test_ajax'
} ;
var req = jQuery.post( target , data,  function(resp) { 
}) ;    

The site responds from admin-ajax.php. The response carries a '200 OK' header. The body of the response is '0'.

The codex tells me that I can expect this response if the value of 'action' in the post body doesn't match the name of a function hooked to the wordpress ajax hooks. But as far as I can tell, I'm good there.

I'm certain that the function is included in my plugin file.

What are the other barest essentials that I need to get this working?

(I don't want to worry about nonces or localizing js at this point. I just want to get a response from the function before I build up further)

2 Answers 2


$.ajax is very simple and you can append more parameters easily in the data: {action:'my_test_ajax'} line, try this:

var target = 'http://'  +  window.location.hostname  + '/wp-admin/admin-ajax.php';
    url: ajax,
    data: {action:'my_test_ajax'},
    type: 'post',
    success: function(data){
        console.log(data, data.title, data.content)

Make sure the target points exactly to admin-ajax.php or set a global variable (or using localize script) to add a variable where you store the path to admin-ajax.php which is admin_url('admin-ajax.php') in case of confusion.

$.ajax does parse JSON data by default, if working with other methods that return the response as is (string) then simply use JSON.parse(response) method. JSON that's because you use wp_send_json($resp) which returns a JSON object response in the endpoint.

Here's an example of adding more data to the request:

Using append method to the data variable or keeping it short and simple as data: {action:'my_test_ajax', name: 'dave', network: 'wpse'} and from the my_test_ajax function you can get these data by $_REQUEST[tag] e.g $_REQUEST['name']

$.get ( $_GET ) method:

This one is even more simple and takes less code:

$.get( target = '/wp-admin/admin-ajax.php?action=my_test_ajax', function( data ) {
    console.log( data )

Remember to use $_REQUEST in your PHP script because it merges all $_GET, $_POST and $_COOKIE data sets. Unless of course you are sure about the method you're working with.

Hope that helps.


1) you have an extra whitespace in code, and that's why it doesnt work:

action: ' my_test_ajax'

2) also, you must include check_admin_referrer() !!!!!!!!!

function  my_test_ajax() {  

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