javascript - Uncaught TypeError: Cannot read property 'app' of undefined -

i have composite view:

var resultview = marionette.compositeview.extend({         template : resultpanel,         itemview : resultitemview,         initialize : function() {             ...         },         itemviewoptions : {             app : this.options.app         }, 

i want assign view's app property itemview's app property. can use view's app other view. i'm getting error: uncaught typeerror: cannot read property 'app' of undefined. doing wrong? there way in order this?

possiblity #1: this.option not yet set when code executes.

possibility #2: maybe 'this' not expect be. assign var = this; before , use 'that' instead of 'this'.

or assign var _options = this.options; before extend() , use _options in extend.