AngularJS中的ng-controller是什麼東東

Darren Ji發表於2016-02-05
AngularJSController

 

在AngularJS中，ng-controller是最常用的directive。比如：

 

var app = angular.module("app",[]);
app.controlle("AppCtrl", function(){
    var app = this;
    app.people = [
        {"firstName":"", "lastName":""},
        ...
    ];
})

app.controller("FirstCtrl", function(){
    var first = this;
    first.message = "i am the first one";
})

app.controller("SecondCtrl", function(){
    var second = this;
    second.message = "i am the second one";
})

 

頁面部分：

 

<body ng-controller="AppCtrl as app">
    <div ng-controller="FirstCtrl as first">
        {{first.message}}
    </div>
    <div ng-controller="SecondCtrl as second">
        {{second.message}}
    </div>
</body>

 

現在模擬一個ng-controller的directive

 

app.directive("myController", function(){
    return {
        scope: true,
        controller: '@'
    }
})

 

可見，my-controller和ng-controlller工作原理是一樣的。

頁面部分使用my-controller

 

<body my-controller="AppCtrl as app">
    <div my-controller="FirstCtrl as first">
        {{first.message}}
    </div>
    <div my-controller="SecondCtrl as second">
        {{second.message}}
    </div>
</body>

 

所有的頁面呈現都不變。

如果我們想讓自定義的my-controller替代AngularJS預設的ng-controller，可以使用priority屬性：

 

app.directive("myController", function(){
    return {
        scope: true,
        controller: '@',
        priority: 500
    }
})

 

預設的priority欄位值是0.

 

相關文章