Limit media to current post attachments

Hello all.

I have a front-end form where a user can upload photos. The photos are added as attachments to the post generated by the submission of the front-end form.

The posts would then be pending admin approval. While reviewing the post I would like to get the attachments from said post and feed them into a slider plugin’s meta box in the back end.

Here’s the question:

Is there any way to limit the media files that show in the “media” window to those that have already been added to the post? When I open the media window, I’d like to only see the photos that have already been attached to the post.

I have found the code below:

 //Chame the selector to fit your code
  jQuery('#manage-gallery-button').click(function(e) {

         e.preventDefault();
         var frame = wp.media({
                       title : 'Pick the images for the gallery of this entry',
                       frame: 'select',
                       multiple : true,
                       library : {
                                    type : 'image',
                                    //HERE IS THE MAGIC. Set your own post ID var
                                    uploadedTo : wp.media.view.settings.post.id
                                  },
                       button : { text : 'Insert' }
                   });

                   frame.on('close',function() {
                      // get selections and save to hidden input plus other AJAX stuff etc.
                      var selection = frame.state().get('selection');
                      var gallery_ids = new Array();
                      var my_index = 0;
                      selection.each(function(attachment) {
                         gallery_ids[my_index] = attachment['id'];
                         my_index++;
                      });
                      var ids = gallery_ids.join(",");
                      //Store ids in my hidden input
                      jQuery('#gallery-ids').val(ids);
                      Refresh_Gallery(ids);
                   });

                  frame.on('open',function() {
                    //Preselect attachements from my hidden input
                    var selection = frame.state().get('selection');
                    ids = jQuery('#gallery-ids').val().split(',');
                    ids.forEach(function(id) {
                      attachment = wp.media.attachment(id);
                      attachment.fetch();
                      selection.add( attachment ? [ attachment ] : [] );
                    });

                  });

                frame.open();
 });

And modified it to the selector of the media button in the slider’s meta box. The id for that box is #wp-igsp-gallery-imgs

When I add the function I get a parse error on the second line of the code. Before and after modifying it I still get the same error.

Something might have changed in the core as this code is from a 2013 post

Thank you for your time.