Model view controller CanJS-控制通信

我现在正在学习CanJS，所以我想尝试一个非常基本的小演示。演示内容是，您将在顶部（单选按钮）显示不同类型的移动充值计划，通过选择每个计划，相应的价格选项将显示在底部的表格中

对于这个演示，我创建了两个模型、两个控件和两个模板文件，我的问题是两个控件如何相互通信？标准方式是什么

现在，我通过实例直接调用控件方法，但我不确定这样做是否正确。另外，请解释Can.Route

输出

数据

var CATEGORIES = [{id: 1 , name: "2G Internet Recharge"},
                  {id: 2 , name: "3G Internet Recharge"},
                  {id: 3 , name: "full talktime Recharge"},
                  {id: 4 , name: "Validity and talktime Recharge"},
                  {id: 5 , name: "National and international roaming"}];
var RECHARGEAMOUNTS =[{
                       id: 1 , 
                       values : [{amount: "Rs. 100" , benefit:"300 MB" ,validity:"30"},
                                 {amount: "Rs. 200" , benefit:"1 GB" ,validity:"30"}]
                       },
                       {
                       id: 2 , 
                       values : [{amount: "Rs. 10" , benefit:"300 MB" ,validity:"30"},
                                 {amount: "Rs. 99" , benefit:"100 GB" ,validity:"90"}]
                       },
                       {
                       id: 3 , 
                       values : [{amount: "Rs. 80" , benefit:"1 GB" ,validity:"50"},
                                 {amount: "Rs. 99" , benefit:"100 GB" ,validity:"50"}]
                       },
                       {
                       id: 4 , 
                       values : [{amount: "Rs. 55" , benefit:"30 MB" ,validity:"10"},
                                 {amount: "Rs. 200" , benefit:"1 GB" ,validity:"30"},
                                 {amount: "Rs. 99" , benefit:"100 GB" ,validity:"90"}]
                       },
                       {
                       id: 5 , 
                       values : [{amount: "Rs. 880" , benefit:"100 MB" ,validity:"90"},
                                 {amount: "Rs. 550" , benefit:"2 GB" ,validity:"30"},
                                 {amount: "Rs. 1000" , benefit:"4 GB" ,validity:"90"},
                                 {amount: "Rs. 1550" , benefit:"10 GB" ,validity:"90"}]
                       }
                     ]; 

型号

//Model Category
CategoryModel = can.Model({
  findAll : function(){
      return $.Deferred().resolve(CATEGORIES);
    }
},{});

//Model Category
ReachargeAmountModel = can.Model({
    findAll : function(){
      return $.Deferred().resolve(RECHARGEAMOUNTS);
    },
    findOne : function(params){
      return $.Deferred().resolve(RECHARGEAMOUNTS[(+params.id)-1]);
    }
},{});

**// Can Control 
var CategoryControl = can.Control({
    // called when a new Todos() is created
    init: function (element, options) {
        // get all todos and render them with
        // a template in the element's html
        var el = this.element;
        CategoryModel.findAll({}, function (values) {
            el.html(can.view('categoriesEJS', values))
        });
        this.options.rchAmtCtrl = new RechargeAmountControl("#rechnageAmountView"); 
    },
    'input click' : function( el, ev ) {
        var id = el.data('category').attr('id');
        console.log(id);
        this.options.rchAmtCtrl.update(id);
    }

});
// Can Control 
var RechargeAmountControl = can.Control({
    // called when a new Todos() is created
    init: function (element, options) {
        // get all todos and render them with
        // a template in the element's html
        this.update(1);//this.update(id,this.element);
    },
    update : function(id){
        var el = this.element;
        ReachargeAmountModel.findOne({id: id}, function( rechargeAmount ){
            // print out the todo name
            //console.log(rechargeAmount.values[id].attr('benefit'));
            el.html(can.view('RechnageAmountEJS', rechargeAmount.values));
        });
    }
});**

new CategoryControl("#categoriesView");     

控制

//Model Category
CategoryModel = can.Model({
  findAll : function(){
      return $.Deferred().resolve(CATEGORIES);
    }
},{});

//Model Category
ReachargeAmountModel = can.Model({
    findAll : function(){
      return $.Deferred().resolve(RECHARGEAMOUNTS);
    },
    findOne : function(params){
      return $.Deferred().resolve(RECHARGEAMOUNTS[(+params.id)-1]);
    }
},{});

**// Can Control 
var CategoryControl = can.Control({
    // called when a new Todos() is created
    init: function (element, options) {
        // get all todos and render them with
        // a template in the element's html
        var el = this.element;
        CategoryModel.findAll({}, function (values) {
            el.html(can.view('categoriesEJS', values))
        });
        this.options.rchAmtCtrl = new RechargeAmountControl("#rechnageAmountView"); 
    },
    'input click' : function( el, ev ) {
        var id = el.data('category').attr('id');
        console.log(id);
        this.options.rchAmtCtrl.update(id);
    }

});
// Can Control 
var RechargeAmountControl = can.Control({
    // called when a new Todos() is created
    init: function (element, options) {
        // get all todos and render them with
        // a template in the element's html
        this.update(1);//this.update(id,this.element);
    },
    update : function(id){
        var el = this.element;
        ReachargeAmountModel.findOne({id: id}, function( rechargeAmount ){
            // print out the todo name
            //console.log(rechargeAmount.values[id].attr('benefit'));
            el.html(can.view('RechnageAmountEJS', rechargeAmount.values));
        });
    }
});**

new CategoryControl("#categoriesView");     

查看

<form id='categoriesView'></form>
</p>
<table id='rechnageAmountView'></table>
<script type='text/ejs' id='RechnageAmountEJS'>
    <tr>
        <th>Recharge Amount</th>
        <th>Benefits</th>
        <th>Validity(Days)</th>
    </tr>
    <% this.each(function( rechargeAmount ) { %>
        <tr>
            <td>
                <%= rechargeAmount.attr( 'amount' ) %>
            </td>   
            <td>
                <%= rechargeAmount.attr( 'benefit' ) %>
            </td>   
            <td>
                <%= rechargeAmount.attr( 'validity' ) %>
            </td> 
        </tr>   
    <% }) %>

 </script>

<script type='text/ejs' id='categoriesEJS'>
    <% this.each(function( category ) { %>
        <input type="radio" 
            name="category" 
            <%= category.attr('id') == 1 ? 'checked' : '' %>
            value=<%= category.attr( 'name' ) %> 
            <%= (el) -> el.data('category',category) %>>
                <%= category.attr( 'name' ) %>
        </input>    
    <% }) %>
</script>

---

有几种方法可以做到这一点

1.直接调用方法 这就是你正在做的，并不一定是错的。为了使事情更加灵活，您可以在初始化

CategoryControl

时传递

recoveriamountcontrol

的类或实例，而不是直接使用它

2.DOM事件 这里，我们将进一步讨论面向事件的体系结构。如果您通常想要通知其他控件，您可以触发任何类型的事件并让它们侦听它。大概是这样的：

3.可观测 另一种选择是使用可观察对象来维护共享状态。这是一种关注数据并让实时绑定完成所有其他工作的好方法。为了使事情更加灵活，应该在控件初始化期间传递state对象（请参阅）：

然后您可以只听RechareAmountControl中的属性更改，如下所示：

'{state} rechargeId': function(Construct, event, id){}

无论何时更新状态，都将调用此处理程序

---

这也是

can.route

的用武之地。基本上，can.route是一个将其状态保存在位置散列中的观察。在上面的例子中，比如

#&rechargeId=1

（除非您初始化特定的路由，如

can.route（“：rechargeId”）

）。如果位置散列发生变化，观察将被更新，反之亦然。

你太棒了，我会选择选项3。我可以问你最后一个问题吗，Can.Route的真正用途是什么？我刚刚从Adobe Flex迁移到JS框架。另外，除了提供什么网站，还有什么关于CanJS的教程，付费的也可以。我更新了我的答案。基本上，can.route只是一个将其状态持续到窗口位置散列的观察。非常感谢Daff！现在是我学习模型列表的时候了。再次感谢。