（二）backbone - DEMO - user list

Demo介绍

学习了如何基本的使用Backbone，展示用户信息

使用JQuery操作DOM，backbone.localStorage.js操作localstorage

大体实现

•创建user Model

 var User = Backbone.Model.extend({
         defaults: {
             username: '小强'
         },
         initialize: function() {
             if (!this.get("username")) {
                 this.set({"username": this.defaults.username});
             }
             if (!this.get("userid")) {
                 this.set({"userid": ++userid});
             }
         }
     });

•创建user Collection管理users

 var UserCollection = Backbone.Collection.extend({
     model: User,
     // 持久化到本地数据库
     localStorage: new Store("users")
 });

•创建View

按功能页划分：

- 列表页

- 添加（修改）页

- 详情页

创建基础View

 var View = Backbone.View.extend({
     register:function (state) {
         this.state = state;
         return this;
     }
 });

创建User Item 视图

 var UserItemView = View.extend({
     tagName: 'li',  // 放view展示内容的外层容器,默认div
     template: _.template($('#user-item-template').html()),
     render: function () {    // 渲染
         this.$el.html(this.template(this.model.toJSON()));
         return this;
     },
     events:{  // 事件列表
         'click .removeUser': 'deleteUser',
         'click .viewUser': 'viewUser'
     },
     viewUser: function() {
         this.state.trigger('viewUser', this.model);
     },
     deleteUser: function() {
         this.state.trigger('removeUser', this.model);
         this.remove();
     }
 });

创建User list 视图，该视图可创建user item view

 var userListView = View.extend({
     template: _.template($('#list-template').html()),
     initialize: function() {
         var view = this;
         this.state = new Backbone.Model();  // 实例化一个model
         this.router = this.options.router;
         // 调用fetch触发reset
         this.collection.unbind('reset');
         this.collection.bind('reset', this.addAll, this);
         setTimeout(function(){
             view.collection.fetch();
         },0);
     },
     render: function() {
         var view = this;
         this.$el.html(this.template(this.state.toJSON()));
         // 服务器同步
         this.state.on('removeUser', function(user) {
             user.destory();
             view.collection.remove(user);
         });
         this.state.on('viewUser', function(user) {
             view.router.navigate('user/' + user.cid, {trigger:true});
         });

         return this;
     },
     createUserItemView: function(user) {
         var userItemView = new UserItemView({
             model: user
         });
         userid = Math.max.call(null, user.get('userid'),userid);
         userItemView.register(this.state).render().$el.appendTo($('#list'));
     },
     addAll: function() {
         this.collection.each(this.createUserItemView.bind(this));
     }
 }); 

User Modify 视图

 var UserModifyView = View.extend({
     template: _.template($('#modify-template').html()),
     initialize: function() {
         this.router = this.options.router;
     },
     render: function() {
         var view = this;
         if(this.model) {
             this.$el.html(this.template(this.model.toJSON()));
         }
         else {
             this.$el.html(this.template({username: ''}));
         }
         setTimeout(function() {
             view.$el.find('input').focus().select();    //设置焦点并选中
         }, 0);
         return this;
     },
     events: {
         'click a.add': 'modify'
     },
     modify: function(){
         var view = this;
         if(this.model){
             this.model.save({'username': this.$el.find('input').val()});
         }
         else {
             this.router.userCollection.create(new User({
                 username:view.$el.find('input').val(),
                 userid: ++userid
             }));
         }
         this.router.navigate('list', {trigger:true});   // 跳转至list
     }
 });

User Detail 视图

 var UserView = View.extend({
     template: _.template($('#user-template').html()),
     initialize: function(){
         this.router = this.options.router;
     },
     render: function(){
         var view = this;
         this.$el.html(this.template(this.model.toJSON()));
         return this;
     },
     events: {
         'click .editUser': 'editUser'
     },
     editUser: function() {
         this.router.navigate('edit/' + this.model.cid, {trigger:true});
         this.remove();
     }
 });

注：以上使用的backbone版本是0.9.2，该版本Backbone.View中可导出options属性，但1.1.2 版本已不再提供该属性

因此，View的定义、实例化可改为：

 var UserListView = View.extend({
         ...
         initialize: function() {
             var view = this;
             this.state = new Backbone.Model();
             this.router = this.attributes.router;   // 使用attributes属性获取
             ...
         }
         ...
 })

 this.currentView = new UserListView({
     collection: router.userCollection,
     attributes:{router:router}    // 使用attributes属性传递
     }).render().$el.appendTo($(this.el));

•Router 控制器

使用控制器将定义的类进行组合

 var App = Backbone.Router.extend({
     initialize: function(el) {
         this.el = el;
         this.userCollection = new UserCollection();
     },
     routes: {
         '': 'list',
         'list': 'list',
         'add': 'edit',
         'edit/:cid': 'edit',
         'user': 'user',
         'user:/:cid': 'user'
     },
     list: function() {
         var router = this;
         this.clean();
         this.currentView = new UserListView({
             collection: router.userCollection,
             router:router
         }).render().$el.appendTo($(this.el));
     },
     edit: function(cid) {
         var router = this,
             user = null;
         this.clean();
         if(cid){
             user = router.userCollection.getByCid(cid);
         }
         this.currentView = new UserModifyView({
             model:user,
             router:router
         }).render().$el.appendTo($(this.el));
     },
     user: function() {
         var router = this,
             user = null;
         this.clean();
         if(cid){
             user = router.userCollection.getByCid(cid);
         }
         this.currentView = new UserView({
             model:user,
             router:router
         }).render().$el.appendTo($(this.el));
     },
     clean:function () {
         if (this.currentView) {
             this.currentView.remove();
             this.currentView = null;
         }
     }
 });

•实例化App

 new App('body');
 Backbone.history.start();

 •html

<!DOCTYPE html>
<html>
<head>
    <title>用户列表以及详细信息</title>
    <meta charset="UTF-8"/>
    <link rel="stylesheet" type="text/css" href="css/app.css">
    <!-- 公共库 -->
    <script type="text/javascript" src="js/lib/jquery.js"></script>
    <script type="text/javascript" src="js/lib/underscore.js"></script>
    <script type="text/javascript" src="js/lib/backbone.js"></script>
    <!-- 本地存储库 -->
    <script type="text/javascript" src="js/lib/backbone.localStorage.js"></script>
    <!--应用库-->
    <script type="text/javascript" src="js/app.js"></script>
</head>
<body>
    <script type="text/template" id="list-template">
        <a href="#add">增加新用户</a>
        <ul id="list">

        </ul>
    </script>
    <script type="text/template" id="user-item-template">
        <a class="viewUser" href="javascript:;"><%= username %></a>
        <a class="removeUser" href="javascript:;">删除</a>
    </script>
    <script type="text/template" id="user-template">
        <p>编号<%= userid %>：</p>
        <a href="javascript:;" class="editUser">名字：<%= username %></a>
    </script>
    <script type="text/template" id="modify-template">
        <input type="text" value="<%= username %>">
        <a class="add" href="javascript:;"><%= !username ? "增加":"修改" %></a>
    </script>
</body>
</html>