editProfileView.js

require.config({
  paths: {
    jquery: 'lib/jquery',
    backbone: 'lib/backbone',
    underscore: 'lib/underscore'
  }
})
define(['jquery', 'underscore', 'backbone', 'text!templates/editprofile.html'], function($, _, backbone, editProfileTemplate) {
  var editProfile = Backbone.View.extend({
		el: $('#renderarea'),
		initialize: function() {
			_.bindAll(this);
		},
		
		template: _.template(editProfileTemplate),

		render: function() {
	      	this.$el.html( this.template(this.model.toJSON()) )
	      return this;
		}
	})

	return {
		editProfile: editProfile
	}
})

router

app_router.on('route:showEditProfile', function() {
      var user = new User.User();

      var editprofile = new editProfileView.editProfile({ model: user})

      user.fetch().then(editprofile.render());
 }
});

user.js(user model)

define(['backbone'], function(backbone) {
  console.log('User model initialized');
	var 
	User = Backbone.Model.extend({
		urlRoot : '/user_API',
		defaults: {
                    username: '',
                    first_name: '',
                    last_name: '',
                    user_email: '',
               	    user_photo: '/assets/img/defuser.jpg'
		},
		userImage: function() {
			return "/assets/img/" + this.get('user_photo');
		},
         fullname: return this.get('first_name') + ' ' + this.get('last_name');

	});

	return {
		User: User
	}
})