How WordPress autosave can save plugin fields?

1 comment

1. I have just made a plugin that needed to be autosaved, so i started to dig into the code. I did now that it have to be trigged by some javascript so started to look into the console in Chrome when autosave fires. I then saw that autosave.js looks for a class tags-input in admin-filters.php you can see the comment:

   // NOTE: the class "tags-input" allows to include the field in the autosave $_POST (see autosave.js)
   

   So i just added the class tags-input to my hidden fields and it now saves when autosave fires!

   Here is my example: <input type="hidden" class="tags-input" name="key" value="value" />

   Update:

   Now you have to add your data by your own ajax function. (add a new js-file and include in footer. admin_enqueue_scripts)

   jQuery(document).ajaxSend(function(e, x, a) {
       var data = 1;
       a.data += '&' + jQuery.param( {test_data: data} );
   });
   

   And the saving:

   add_action('save_post', 'autosave_save_custom');
   
   function autosave_save_custom( $post ) {
       if( wp_is_post_autosave($post) && isset( $_POST['test_data'] ) ) {
           $test_data = intval( $_POST['test_data'] );
           $post_id = $post->ID;
           update_metadata( $post->post_type, $post_id, 'test_data', $test_data );
       }
   }
   

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