从其他控制器调用指令控制器中的方法 [英] Call method in directive controller from other controller

问题描述

我有一个指令，它有自己的控制器.看下面的代码:

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

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'
    }

});

这是一个错误/通知/警告通知系统.我想要做的是从另一个控制器(不是指令控制器)调用此控制器上的函数 show.当我这样做时，我还希望我的链接函数能够检测到某些属性发生了变化并执行了一些动画.

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.

这里有一些代码来举例说明我的要求:

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

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

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

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

所以当在 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.我怎么能做到这一点?

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?

推荐答案

这是一个有趣的问题，我开始思考如何实现这样的事情.

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

我想出了这个(小提琴)；

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容纳所有弹出逻辑:

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

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

我在模块中放了两件事，一个用于 API 的 factory 可以在任何地方注入，directive 用于定义实际弹出元素的行为:

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:

工厂只定义了几个函数 success 和 error 并跟踪几个变量:

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

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;
        }
    }
});

该指令将 API 注入到其控制器中，并监视 API 的变化(为了方便，我使用了 bootstrap css):

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

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>'
    }
})

然后我定义了一个依赖于 Popdown 的 app 模块:

Then I define an app module that depends on 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); }
});

HTML 如下所示:

<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>

我不确定它是否完全理想，但它似乎是一种与 global-ish popdown 指令建立通信的合理方式.

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.

再次，作为参考，小提琴.

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