Backbone.js | How to save presentation elements for search later?

Question

This is my first attempt to use Backbone.js, so I decided to create a simple test application that simulates a restaurant menu with menu elements. I followed this cool blog post from andyet.net .

I had a problem adding a model to the collection. I associated the view method with a collection add event, which should update the view. Here is the code with the maximum code removal possible.

(note: for brevity, I deleted things like local declarations varand closures. Below is still a bit, and I know this is annoying, but it should be pretty simple and easy to understand):

MenuItem = Backbone.Model.extend({
    // initialize functions removed for brevity
});
Menu = Backbone.Model.extend({
    // initialize functions removed for brevity
    // MenuSelection property is defined here.
});
MenuSelection = Backbone.Collection.extend({ model: MenuItem });
MenuItemView = Backbone.View.extend({
    // render template
});

/**
 * This is unaltered from the code.  The error occurs here.
 */
RestaurantAppView = Backbone.View.extend({
    addMenuItem : function (MenuItem) {
        var view = new MenuItemView({ model : MenuItem });
        this.menuList.append(view.render().el);
        // ERROR occurs here.  error: "this.menuList is undefined"
    },
    initialize : function () {
        this.model.MenuSelection.bind('add', this.addMenuItem);
    },
    render : function () {
        $(this.el).html(ich.app(this.model.toJSON()));
        this.menuList = this.$('#menuList'); // IT IS DEFINED HERE
        return this;
    }
});

/**
 * Everything after this I left in just-in-case you need to see it.
 */
RestaurantAppController = {
    init : function (spec) {
        this.config = { connect : true };
        _.extend(this.config, spec);
        this.model = new Menu({
           name : this.config.name,
        });
        this.view = new RestaurantAppView({ model : this.model });
        return this;
    }
};
$(function() {
    // simulating ajax JSON response.
    var json = {
        Menu : {
            name : 'Appetizers',
            MenuItem : [
                {
                    name : 'toast',
                    description : 'very taosty',
                    price : '$20.00'
                },
                {
                    name : 'jam',
                    description : 'very jammy',
                    price : '$10.00'
                },
                {
                    name : 'butter',
                    description : 'very buttery',
                    price : '$26.00'
                }
            ]
        }
    };
    window.app = RestaurantAppController.init({
        name : json.Menu.name
    });
    $('body').append(app.view.render().el);
    app.model.MenuSelection.add(json.Menu.MenuItem);
});  

. :

jQuery Zepto , $, , .

, this.menuList = this.$('#menuList'); , this.menuList addMenuItem? , , . , this.menuList jQuery, :

addMenuItem : function (MenuItem) {
    var view = new MenuItemView({ model : MenuItem });
    $('#menuList').append(view.render().el);
}

. menulist , addMenuItem. RightWay ^TM - .

: , , ICanHaz , this.menuList , undefined, .

Answer 1

# 1 JavaScript - this . this.addMenuItem , addMenuItem this. , :

this.model.MenuSelection.bind('add', this.addMenuItem);

:

this.model.MenuSelection.bind('add', _.bind(this.addMenuItem, this));

initialize, :

_.bindAll(this, 'addMenuItem');

Answer 2

, addMenuItem render , , menuList addMenuItem.

this.menuList = this. $('# menuList'); ?