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This script works well on standalone site:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
jQuery(document).ready(function(){  
    jQuery.ajax({
             url: 'xxx',
             success: function(data, textStatus, jqXHR ) {
                 alert(jqXHR.responseText);
             },
             error: function(jqxhr, status, exception) {
                 alert('Exception:', exception);
             }
         })
});
</script>

However when I try to use it on WordPress page it returns me an empty exception. What can be causing this behavior and how I can debug this?

(I added the lines below in functions.php)

function include_jquery() {

    wp_deregister_script('jquery');
    wp_enqueue_script('jquery', 'https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js', array(), null, true);

}
add_action('wp_enqueue_scripts', 'include_jquery');

One important remark is that js window.onload stopped working on my WordPress a few days ago and I started using jQuery(document).ready. I don't know why, maybe someone made some changes that I'm not aware of.

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4
  • 1
    Trying to use jQuery 3.X could be breaking another plugin or your theme because it’s expecting the bundled version of jQuery. Why are you trying to load your own version?
    – Jacob Peattie
    Jul 15, 2018 at 15:12
  • I was trying different things to fix it. Without my own version (after removing include_jquery()) it works the same - empty exception
    – sswwqqaa
    Jul 15, 2018 at 15:18
  • Why do you deregister WP’s jquey? And what is the URL you use in ajax call (‘xxx’)?
    – Krzysiek Dróżdż ♦
    Jul 15, 2018 at 15:48
  • It's api hosted on other server. I thought the problem was on my side because I was doing changes on my website. But It seems that it is a problem of missing <IfModule mod_headers.c> Header set Access-Control-Allow-Origin "*" </IfModule> in .htaccess
    – sswwqqaa
    Jul 15, 2018 at 16:17

1 Answer 1

Reset to default
-1

As I said in the comments. The problem was on api side.

Error: (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).

How to solve: Add this to .htaccess of api

<IfModule mod_headers.c>
    Header set Access-Control-Allow-Origin: myUrl
</IfModule>
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4
  • unlimited access from any source to any end point === horrible security.
    – Mark Kaplun
    Jul 15, 2018 at 17:39
  • How can I do it better if I want to exchange data between two sites? and why it is that bad?
    – sswwqqaa
    Jul 15, 2018 at 17:40
  • you need to whitelist only the site(s) in question. CORS protects you from ajax based atacks, something like using the fact that you are already logged-in to site A to try to delete all content from it with ajax requests using the delete post wordpress ajax request. Limiting the sites that are allowed to do it even in theory is a must, better if you use the wp-json end points is to also remove CORS only for the very specific end point you need to use from the other site
    – Mark Kaplun
    Jul 15, 2018 at 18:02
  • Thanks for detailed explanation. I'll try to make it work the safer way.
    – sswwqqaa
    Jul 15, 2018 at 18:13

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