1. model定义
var app = app || {}; (function () { ‘use strict‘; // User Model // ---------- app.User = Backbone.Model.extend({ defaults: { firstName: ‘‘, lastName: ‘‘, telNo:‘‘, email:‘‘ }, }); })();
2.Collection定义
var app = app || {}; (function () { ‘use strict‘; var Users = Backbone.Collection.extend({ // Reference to this collection‘s model. model: app.User, // Save all of the todo items under the `"todos"` namespace. localStorage: new Backbone.LocalStorage(‘users-backbone‘), }); // Create our global collection of **Users**. app.users = new Users(); })();
3. View
/*global Backbone, jQuery, _, ENTER_KEY */ var app = app || {}; (function ($) { ‘use strict‘; app.AppView = Backbone.View.extend({ //el: ‘.user-list-tb‘, el: ‘.container‘, events: { ‘click #register-btn‘: ‘register‘, ‘click #add-btn‘: ‘add‘, ‘click #push-btn‘: ‘push‘, ‘click #unshift-btn‘: ‘unshift‘, //‘click #add‘: ‘register‘, }, initialize: function() { this.$list = $(‘#user-list-bd‘); //this.$list = $(‘#user-list‘); this.listenTo(app.users, ‘add‘, this.addOne); this.listenTo(app.users, ‘reset‘, this.addAll); //this.listenTo(app.users, ‘all‘, _.debounce(this.render, 0)); app.users.fetch({reset: true}); }, /*render: function() { },*/ newAttributes: function() { return { firstName:this.$("#firstname").val(), lastName:this.$("#lastname").val(), telNo:this.$("#telNo").val(), email:this.$("#email").val(), }; }, register: function() { var a = this.newAttributes(); app.users.create(a); }, addOne: function(user) { var view = new app.UserlistView({ model: user }); this.$list.append(view.render().el); //$(‘#aa‘).append("<span>bb</span>"); }, addAll: function() { ///this.$list.html(‘‘); app.users.each(this.addOne, this); }, add: function(){ var a = this.newAttributes(); app.users.add(a,{at:2}); console.dir(app.users); }, push: function(){ var a = this.newAttributes(); app.users.push(a); console.dir(app.users.models); }, unshift: function(){ var a = this.newAttributes(); app.users.unshift(a); console.dir(app.users); } }); })(jQuery);
/*global Backbone, jQuery, _, ENTER_KEY */ var app = app || {}; (function ($) { ‘use strict‘; app.UserlistView = Backbone.View.extend({ tagName: ‘tr‘, //tagName: ‘li‘, template: _.template($(‘#user-list‘).html()), //template: _.template(‘<div><%= firstName %>:<%= telNo %></div>‘), initialize: function () { this.listenTo(this.model, ‘change‘, this.render); }, // Re-render the titles of the todo item. render: function () { /*if (this.model.changed.id !== undefined) { return; } this.$el.html(this.template(this.model.toJSON())); this.$el.toggleClass(‘completed‘, this.model.get(‘completed‘)); this.toggleVisible(); this.$input = this.$(‘.edit‘); return this;*/ var a = this.template(this.model.toJSON()); this.$el.html(a); return this; }, }); })(jQuery);
4. create,add,push,unshift
首先看下create的源代码
// Create a new instance of a model in this collection. Add the model to the // collection immediately, unless `wait: true` is passed, in which case we // wait for the server to agree. create: function(model, options) { options = options ? _.clone(options) : {}; var wait = options.wait; if (!(model = this._prepareModel(model, options))) return false; if (!wait) this.add(model, options); var collection = this; var success = options.success; options.success = function(model, resp, callbackOpts) { if (wait) collection.add(model, callbackOpts); if (success) success.call(callbackOpts.context, model, resp, callbackOpts); }; model.save(null, options); return model; },
从源代码来看,create调用model的add方法,然后又调用了save方法,save方法将保存模型到数据库(或替代持久化层)。
create方法触发collection的add事件和sync事件。
再看下add,push,unshift的源代码
// Add a model, or list of models to the set. add: function(models, options) { return this.set(models, _.extend({merge: false}, options, addOptions)); }, // Add a model to the end of the collection. push: function(model, options) { return this.add(model, _.extend({at: this.length}, options)); }, unshift: function(model, options) { return this.add(model, _.extend({at: 0}, options)); },
add方法是向集合中增加一个模型(或一个模型数组),触发"add"事件。
传递{at: index}可以将模型插入集合中特定的index索引位置。
push是向集合的末尾增加一个模型。
而unshift是向集合的头上追加一个模型。
当然我们调用的时候,还可以指定option,比如{at: 2}来更改插入位置。
从上面的源代码可以看出,上面3个函数归根结底都是调用set函数,并没有调用save,所以不会将新增加的模型保存到服务器。
5. 关于set方法
http://www.css88.com/doc/backbone/#Collection-set
上是这样解释的:
set方法通过传递模型列表执行一个集合的"smart(智能)"的更新。 如果列表中的一个模型尚不在集合中,那么它将被添加; 如果模型已经在集合中,其属性将被合并; 并且如果集合包含不存在于列表中的任何模型,他们将被删除。 以上所有将触发相应的"add", "remove", 和 "change"事件。 返回集合中的模型。 如果您想自定义的行为, 你可以设置选项:{add: false}, {remove: false}, 或 {merge: false},将其禁用。
时间: 2024-10-09 15:55:35