Ajax : Why success displays 0?

Question

I use ajax with jquery and when I tried to display the result in popup. Then alert always displays 0

success : function(results) { 
alert(result         


        

Answer 1

May be you are trying without login. so you need to use this action.

add_action('wp_ajax_nopriv_my_action', 'my_action_callback');

you will get response. :)

Answer 2

Found it.

It need to add die(); before the end of my own ajax function in function.php.

Because there is one line of script in admin-ajax.php after my own ajax_action that says: die('0'); So we need to die() script before die('0').

Answer 3

Those who get error 0 :), action => 'action'

var data = {'action': 'my_action', 'data': form_data };

$.post(ajaxurl, data, function(response) { alert(response);});

Answer 4

I was adding the "action" incorrectly. You have to prefix your action with wp_ajax_gd_.

add_action('wp_ajax_gd_[ACTION NAME]', '[CALLBACK FUNCTION NAME]')

and in the JS jQuery post:

var data = {
    'action': '[ACTION NAME]',
};

I found Wordpress' documentation very unclear about this part.

Answer 5

In your PHP function, make sure you're using echo instead of return.

This was happening for me in a WordPress theme.

function doAjax() {
    $result = getPosts();
    echo json_encode($result, true);
    die();
}

Answer 6

Try to add die(); or exit(); at the very last line of the function.