Title: [Plugin: FavoritePosts] Button does nothing, ReferenceError: jQuery not defined
Last modified: September 1, 2016

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# [Plugin: FavoritePosts] Button does nothing, ReferenceError: jQuery not defined

 *  Resolved [perleone](https://wordpress.org/support/users/perleone/)
 * (@perleone)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/plugin-favoriteposts-button-does-nothing-referenceerror-jquery-not-defined/)
 * hello,
 * I use favoriteposts Plugin for a little notepad feature on my site. I developed
   a simple form with it on a subdomain. When I was happy with the result, I installed
   the favoriteposts plugin on the real page. But then I realized that the favoriteposts
   buttons dont work on this wordpress installation. (I can see the Button at the
   end of each post, but when I click it, nothing happens, no Post Ajax request!).
   On my subdomain which is a copy of the real site, everything works fine.
 * I checked the site with firebug and run into a bunch of Errors. I think one or
   even more of these errors could be responsible for my problem with favoriteposts.
   Am I right here?
 * >  ReferenceError: jQuery is not defined
   >  ReferenceError: jQuery is not defined
   > TypeError: e is not a function ReferenceError: Backbone is not defined ReferenceError:_
   > is not defined
 * But how can I fix it? How can I define jQuery, Backbone and co to avoid these
   Errors, Why they even occur?
 * [This is the link to my Site](http://bit.ly/29nIAcH)
 * Thanks for your help!

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Thread Starter [perleone](https://wordpress.org/support/users/perleone/)
 * (@perleone)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/plugin-favoriteposts-button-does-nothing-referenceerror-jquery-not-defined/#post-7550757)
 * I solved the Problem but just in a deprecitated way. The trouble is caused by
   the jQuery Error. But I am not able to enqueue jQuery via
 *     ```
       add_action( 'wp_print_scripts', 'add_my_scripts', 100 );
       function add_my_scripts() {
       if ( !is_admin() ) {
       wp_deregister_script( 'jquery' );
       wp_register_script( 'jquery', ( 'https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js' ), false, null, true );
       wp_enqueue_script( 'jquery' );
       } }
       add_action('init', 'add_my_scripts');
       ```
   
 * or
 *     ```
       add_action( 'wp_print_scripts', 'add_my_scripts', 100 );
       function add_my_scripts() {
       if ( !is_admin() ) {
       wp_deregister_script( 'jquery' );
       wp_register_script( 'jquery', ( 'https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js' ), false, null, false );
       wp_enqueue_script( 'jquery' );
       } }
       add_action('init', 'add_my_scripts');
       ```
   
 * when I look at my sourcecode I can see jQuery is embedded in the head, like in
   the codeblock
 *     ```
       <script type='text/javascript' defer='defer' src='https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js'></script>
       ```
   
 * but I run into the same jQuery Issue anyway.
 * Only when I insert my jQuery through the header.php, like its not recommended
   I solved my Problem, no Errors, FavoritePosts works.
 * But I want to do it the right way, Can anyone help me please
 * Thanks!
 *  Thread Starter [perleone](https://wordpress.org/support/users/perleone/)
 * (@perleone)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/plugin-favoriteposts-button-does-nothing-referenceerror-jquery-not-defined/#post-7550772)
 * Problem solved.
 * It occured because of the ‘defer’ in the script tag. This was caused by the Plugin
   
   Async JavaScript. It was possible to exclude jQuery.js from the Async Plugin 
   an then everything worked fine.
 * Maybe this can help someone in the future.
    Thanks anyway
 * perleone

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘[Plugin: FavoritePosts] Button does nothing, ReferenceError: jQuery not
defined’ is closed to new replies.

## Tags

 * [backbone](https://wordpress.org/support/topic-tag/backbone/)
 * [jquery](https://wordpress.org/support/topic-tag/jquery/)
 * [not defined](https://wordpress.org/support/topic-tag/not-defined/)
 * [reference error](https://wordpress.org/support/topic-tag/reference-error/)

 * 2 replies
 * 1 participant
 * Last reply from: [perleone](https://wordpress.org/support/users/perleone/)
 * Last activity: [9 years, 11 months ago](https://wordpress.org/support/topic/plugin-favoriteposts-button-does-nothing-referenceerror-jquery-not-defined/#post-7550772)
 * Status: resolved

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