wp.media listen to changes / sync when opening a media modal

media-modal-data-sync.js

(function($,wp){
	var handle_attachment_change = function(attachment){
		console.log(attachment);
	}
	var media_modal = wp.media({
		multiple: 'add',
		library: {type: 'image'},
		button: {
			text: 'Select image'
		}
	});
	
	media_modal.on('attach', function(){
		var library = update_slide_frame.state().get('library');
		// listen to the change event on the library items
		media_modal.listenTo(library, 'change', function(attachment)){ 
			// do something with the changed model
			 handle_attachment_change(attachment);
		};
		// listen to the Sync event on the library
		media_modal.listenTo(library, 'sync', function(attachment)){ 
			// do something with the changed model
			 handle_attachment_change(attachment);
		};
	});
	
})(jquery, wp);