从其他控制器调用指令控制器中的方法

I have a directive that has its own controller. See the below code:

我有一个有自己控制器的指令。看下面的代码:

var popdown = angular.module('xModules',[]);

popdown.directive('popdown', function () {
    var PopdownController = function ($scope) {
        this.scope = $scope;
    }

    PopdownController.prototype = {
        show:function (message, type) {
            this.scope.message = message;
            this.scope.type = type;
        },

        hide:function () {
            this.scope.message = '';
            this.scope.type = '';
        }
    }

    var linkFn = function (scope, lElement, attrs, controller) {

    };

    return {
        controller: PopdownController,
        link: linkFn,
        replace: true,
        templateUrl: './partials/modules/popdown.html'
    }

});

This is meant to be a notification system for errors/notifications/warnings. What I want to do is from another controller (not a directive one) to call the function show on this controller. And when I do that, I would also want my link function to detect that some properties changed and perform some animations.

这是一个错误/通知/警告的通知系统。我要做的是从另一个控制器(不是指令控制器)调用这个控制器上显示的函数。当我这样做的时候，我也希望我的link函数检测到一些属性发生了变化并执行一些动画。

Here is some code to exemplify what I'm asking for:

这里有一些代码来举例说明我所要求的:

var app = angular.module('app', ['RestService']);

app.controller('IndexController', function($scope, RestService) {
    var result = RestService.query();

    if(result.error) {
        popdown.notify(error.message, 'error');
    }
});

So when calling show on the popdown directive controller, the link function should also be triggered and perform an animation. How could I achieve that?

因此，当在popdown指令控制器上调用show时，链接函数也应该被触发并执行动画。我怎么能做到呢?

4 个解决方案

#1

This is an interesting question, and I started thinking about how I would implement something like this.

这是一个有趣的问题，我开始思考如何实现这样的东西。

I came up with this (fiddle);

我想出了这个(小提琴);

Basically, instead of trying to call a directive from a controller, I created a module to house all the popdown logic:

基本上，我没有尝试从控制器调用指令，而是创建了一个模块来存放所有弹出式逻辑:

var PopdownModule = angular.module('Popdown', []);

I put two things in the module, a factory for the API which can be injected anywhere, and the directive for defining the behavior of the actual popdown element:

我在模块中放入了两个东西，一个可以被注入任何地方的API工厂，以及定义实际弹出元素行为的指令:

The factory just defines a couple of functions success and error and keeps track of a couple of variables:

工厂只定义了两个函数的成功和错误，并跟踪了两个变量:

PopdownModule.factory('PopdownAPI', function() {
    return {
        status: null,
        message: null,
        success: function(msg) {
            this.status = 'success';
            this.message = msg;
        },
        error: function(msg) {
            this.status = 'error';
            this.message = msg;
        },
        clear: function() {
            this.status = null;
            this.message = null;
        }
    }
});

The directive gets the API injected into its controller, and watches the api for changes (I'm using bootstrap css for convenience):

该指令将API注入其控制器，并监视API的更改(为了方便起见，我使用引导css):

PopdownModule.directive('popdown', function() {
    return {
        restrict: 'E',
        scope: {},
        replace: true,
        controller: function($scope, PopdownAPI) {
            $scope.show = false;
            $scope.api = PopdownAPI;

            $scope.$watch('api.status', toggledisplay)
            $scope.$watch('api.message', toggledisplay)

            $scope.hide = function() {
                $scope.show = false;
                $scope.api.clear();
            };

            function toggledisplay() {
                $scope.show = !!($scope.api.status && $scope.api.message);               
            }
        },
        template: '<div class="alert alert-{{api.status}}" ng-show="show">' +
                  '  <button type="button" class="close" ng-click="hide()">&times;</button>' +
                  '  {{api.message}}' +
                  '</div>'
    }
})

Then I define an app module that depends on Popdown:

然后我定义一个app模块，它依赖于Popdown:

var app = angular.module('app', ['Popdown']);

app.controller('main', function($scope, PopdownAPI) {
    $scope.success = function(msg) { PopdownAPI.success(msg); }
    $scope.error   = function(msg) { PopdownAPI.error(msg); }
});

And the HTML looks like:

HTML看起来是这样的:

<html ng-app="app">
    <body ng-controller="main">
        <popdown></popdown>
        <a class="btn" ng-click="success('I am a success!')">Succeed</a>
        <a class="btn" ng-click="error('Alas, I am a failure!')">Fail</a>
    </body>
</html>

I'm not sure if it's completely ideal, but it seemed like a reasonable way to set up communication with a global-ish popdown directive.

我不确定它是否完全理想，但它似乎是一种合理的方式来建立与一个全球化的popdown指令的通信。

Again, for reference, the fiddle.

作为参考，小提琴。

#2

You can also use events to trigger the Popdown.

您还可以使用事件来触发弹出窗口。

Here's a fiddle based on satchmorun's solution. It dispenses with the PopdownAPI, and the top-level controller instead $broadcasts 'success' and 'error' events down the scope chain:

这是一个基于satchmorun解决方案的小提琴。它不使用PopdownAPI，而*控制器则在作用域链中以$broadcast 'success'和'error'事件:

$scope.success = function(msg) { $scope.$broadcast('success', msg); };
$scope.error   = function(msg) { $scope.$broadcast('error', msg); };

The Popdown module then registers handler functions for these events, e.g:

弹出式模块然后为这些事件注册处理程序函数，例如:

$scope.$on('success', function(event, msg) {
    $scope.status = 'success';
    $scope.message = msg;
    $scope.toggleDisplay();
});

This works, at least, and seems to me to be a nicely decoupled solution. I'll let others chime in if this is considered poor practice for some reason.

至少，这是可行的，在我看来，这是一个很好的解耦解决方案。如果出于某种原因，这种做法被认为是不恰当的，我会让其他人加入进来。

#3

You could also expose the directive's controller to the parent scope, like ngForm with name attribute does: http://docs.angularjs.org/api/ng.directive:ngForm

您还可以将该指令的控制器公开给父范围，如具有name属性的ngForm: http://docs.angularjs.org/api/ng.directive:ngForm

Here you could find a very basic example how it could be achieved http://plnkr.co/edit/Ps8OXrfpnePFvvdFgYJf?p=preview

在这里，您可以找到一个非常基本的示例，说明如何实现http://plnkr.co/edit/ps8oxrfpnepvvdfgyjf?

In this example I have myDirective with dedicated controller with $clear method (sort of very simple public API for the directive). I can publish this controller to the parent scope and use call this method outside the directive.

在这个例子中，我有myDirective with专用控制器和$clear方法(类似于指令的非常简单的公共API)。我可以将这个控制器发布到父作用域，并在指令之外调用这个方法。

#4

I got much better solution .

我有更好的解决办法。

here is my directive , I have injected on object reference in directive and has extend that by adding invoke function in directive code .

这是我的指令，我在指令中注入了对象引用，并通过在指令代码中添加调用函数来扩展它。

app.directive('myDirective', function () {
    return {
        restrict: 'E',
        scope: {
        /*The object that passed from the cntroller*/
        objectToInject: '=',
        },
        templateUrl: 'templates/myTemplate.html',

        link: function ($scope, element, attrs) {
            /*This method will be called whet the 'objectToInject' value is changes*/
            $scope.$watch('objectToInject', function (value) {
                /*Checking if the given value is not undefined*/
                if(value){
                $scope.Obj = value;
                    /*Injecting the Method*/
                    $scope.Obj.invoke = function(){
                        //Do something
                    }
                }    
            });
        }
    };
});

Declaring the directive in the HTML with a parameter:

使用参数在HTML中声明指令:

<my-directive object-to-inject="injectedObject"></ my-directive>

my Controller:

我的控制器:

app.controller("myController", ['$scope', function ($scope) {
   // object must be empty initialize,so it can be appended
    $scope.injectedObject = {};

    // now i can directly calling invoke function from here 
     $scope.injectedObject.invoke();
}];