angularJS系列之Controller传值-$on、$emit、$broadcast

电玩女神 2022-07-20 15:15 196阅读 0赞

## Controller之间传值方法 ##

1.  通过value、constant、$rootscope等全局变量传值，只读
2.  通过provider传值，可读可写。应用可参考我之前写的文章[provider实现全局变量赋值][provider]
3.  通过angularJS的消息时间，利用on、emit、$broadcast进行传值

## 说明 ##

关于on、emit、$broadcast方法传值，有一点需要提前注明：

那就是，这种方法是基于angularJS提供的冒泡和隧道机制，因此只能从子控制器传到父控制器（使用$emit），或者从父控制器传到子控制器（使用$broadcast），不能进行平级controller之间的值传递。

### 代码结构 ###

![这里写图片描述][20160708134431314]

### html代码 ###

<!DOCTYPE html>
    <html ng-app="demoForNotify">
    <head>
        <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
        <script src="./lib/angular.js"></script>
        <script src="./js/app.js"></script>
        <script src="./js/controller.js"></script>
    </head>
    <body>
    <div ng-controller="parentCtr">
        <div ng-controller="childCtr1"> child 1 name :
            <input ng-model="name" type="text" ng-change="change(name);"/>
        </div>
        <div ng-controller="childCtr2">child 2 name:
            <input ng-model="child2Name"/>
        </div>
    </div>
    <div ng-controller="parentBrotherCtr">
        <div ng-controller="brotherChildCtr1">brotherChild 1 name :
            <input ng-model="name" type="text" ng-change="change(name);"/>
        </div>
        <div ng-controller="brotherChildCtr2">brotherChild 2 name:
            <input ng-model="brotherName2"/>
        </div>
    </div>
    </body>
    </html>

### app.js ###

var demoForDirective = angular.module('demoForNotify', ['demoForNotify.controller']);

### controller.js ###

/** * Created by jywl on 2016/7/7. */
    angular.module('demoForNotify.controller', [])
        .controller("parentCtr",
            function ($scope) { 
                $scope.$on("Ctr1NameChange",
                    function (event, msg) { 
                        console.log("parent msg", msg);
                        $scope.$broadcast("Ctr1NameChangeFromParrent", msg);
                    });
            })
        .controller("childCtr1", function ($scope) { 
            $scope.change = function (name) { 
                console.log("childCtr1", name);
                $scope.$emit("Ctr1NameChange", name);
            };
        })
        .controller("childCtr2", function ($scope) { 
            $scope.$on("Ctr1NameChangeFromParrent",
                function (event, msg) { 
                    console.log("childCtr2", msg);
                    $scope.child2Name = msg;
                });
        })
        .controller("parentBrotherCtr",
            function ($scope) { 
                $scope.$on("Ctr1NameChange",
                    function (event, msg) { 
                        console.log("parent msg", msg);
                        $scope.$broadcast("Ctr1NameChangeFromParrent", msg);
                    });
            })
        .controller("brotherChildCtr1", function ($scope) { 
            $scope.change = function (name) { 
                console.log("childCtr1", name);
                $scope.$emit("Ctr1NameChange", name);
            };
        })
        .controller("brotherChildCtr2", function ($scope) { 
            $scope.$on("Ctr1NameChangeFromParrent",
                function (event, msg) { 
                    console.log("childCtr2", msg);
                    $scope.brotherName2 = msg;
                });
        })

## 备注 ##

其中app.js中仅有一句话，意思就是声明一个根作用域，然后包含了其他子作用域，其类型可以是service，controller，以及其他类型。这样写，更符合angularJS模块划分原则。同样也能够更好的利用angularJS提供的测试模块进行单元测试和集成测试。

所有原创文章，均首发CSDN-[柠檬加冰博客][Link 1]

[provider]: http://blog.csdn.net/xuexiiphone/article/details/51822692
[20160708134431314]: /images/20220720/8a659ab9270449abb387e65ea8ba26fa.png
[Link 1]: http://blog.csdn.net/xuexiiphone