backbone.js - why behaviors are not allowed to pass dynamically? -


i working on marionette.behavior.i trying pass behaviors hash dynamically @ time of view initialization not getting assigned behaviors object of view.because behaviors getting initialized @ time of view construction. achieved solution in following way right way achieve it? there other way achieve? , why behaviors not allowed pass dynamically?

here's code:

var behaviour = new marionette.application();  behaviour.addregions({     mainregion:"#main-region" });   var person = backbone.model.extend({        defaults:{          firstname:"na",          lastname:"na",         phonenumber:"na",         presentaddr:"na",         permanantaddr:"na"     } });   var buttonview=marionette.itemview.extend({  template:"#buttontemplate",    constructor:function(options){        this.behaviors = options.behaviors;      marionette.itemview.apply(this, arguments);   },   events:{      "click .display":"displaydetail"  },   displaydetail:function(){       this.triggermethod("displaypersondetails");  },  //behaviors:{behavior1:{ },behavior2:{ }} })   var persondetailsview = marionette.itemview.extend({  template:"#static-template",  ui: { "change": ".change" },  events:{  "click @ui.change":"changebehavior" },   changebehavior:function(){  },  });  var behavior1 = marionette.behavior.extend({      ondisplaypersondetails:function(){      var person=new      person({firstname:"abhijeet",lastname:"avhad",phonenumber:"9604074690",permanantaddr:"sangamner",presentaddr:""})     var myview = new persondetailsview({model:person});     behaviour.mainregion.show(myview);      }  });  var behavior2 = marionette.behavior.extend({      ondisplaypersondetails:function(){       var person =new person({firstname:"abhijeet",lastname:"avhad",phonenumber:"9604074690",permanantaddr:"",presentaddr:"shivajinagar"})     var myview =new persondetailsview({model:person});     behaviour.mainregion.show(myview);       }  });   behaviour.on("initialize:after", function(){      console.log(" started!");          marionette.behaviors.behaviorslookup = function() {          return window.behaviors;     };         window.behaviors = {};          window.behaviors.behavior1 = behavior1;         window.behaviors.behavior2 = behavior2;       var buttonview=new buttonview({behaviors:{behavior1:{ },behavior2:{}}});         behaviour.mainregion.show(buttonview);    }); behaviour.start();

the other way of achieving in definition declare function returns behaviors supplied @ initialization, this:

var buttonview=marionette.itemview.extend({     ...     behaviors: function () {         return this.options.behaviors;     },     ...

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