Angularjs 在控制器之间共享数据 [英] Angularjs sharing data between controllers

问题描述

我有一个从我的服务器获取一些客户端数据的服务:

I have a service that fetches some client data from my server:

app.factory('clientDataService', function ($http) {
    var clientDataObject = {};
    var cdsService = {
        fetch: function (cid) {
            //$http returns a promise, which has a then function, which also returns a promise
            var promise = $http.get('/clients/stats/' + cid + '/').then(function (response) {
                // The then function here is an opportunity to modify the response
                console.log(response);
                // The return value gets picked up by the then in the controller.
                clientDataObject = {'data': response.data, 'currentClientID': cid};
                return clientDataObject;
            });
            // Return the promise to the controller
            return promise;
        }
    };
    return cdsService;
});

然后在一个控制器中我做:

Then in one controller I do:

//get stats
clientDataService.fetch($scope.id).then(function (response) {
    $scope.client_data = {
        'statistics': response.data
    }
});

这一切都很好.但是，我正在尝试从该服务上的另一个控制器进行监视，以在数据更改时更新它的范围，而不必重新启动 http 请求:

Which all works very well. However, I'm trying to do a watch from another controller on that service to update it's scope when the data changes, rather then having to re-kick off the http request:

$scope.$watch('clientDataService.clientDataObject', function (cid) {
    alert(cid);
});

我现在只是提醒，但它永远不会触发.当页面最初加载时，它会警告未定义".我在控制台中没有错误，所有 $injects 都很好，但它似乎从未意识到服务中的数据已更改.我在手表上做错了什么吗?

I'm just alerting for now, but it never ever triggers. When the page initially loads, it alerts "undefined". I have no errors in the console and all the $injects are fine, but it never seems to recognize that data has changed in the service. Am I doing something wrong in the watch?

非常感谢本

推荐答案

clientDataService.clientDataObject 不是您的控制器范围的一部分，因此您无法观察该对象的更改.您需要将 $rootScope 注入您的服务，然后将更改广播到控制器范围.

clientDataService.clientDataObject is not part of your controller's scope, so you can't watch for changes on that object. You need to inject the $rootScope into your service then broadcast the changes to the controllers scopes.

app.factory('clientDataService', function ($rootScope, $http) {
    var clientDataObject = {};
    var cdsService = {
        fetch: function (cid) {
            var promise = $http.get('/clients/stats/' + cid + '/').then(function (response) {
                // The then function here is an opportunity to modify the response
                console.log(response);
                // The return value gets picked up by the then in the controller.
                clientDataObject = {'data': response.data, 'currentClientID': cid};
                $rootScope.$broadcast('UPDATE_CLIENT_DATA', clientDataObject);
                return clientDataObject;
            });
            // Return the promise to the controller
            return promise;
        }
    };
    return cdsService;
});

然后在控制器中，您可以使用以下命令监听更改:

Then in the controller you can listen for the change using:

$scope.$on('UPDATE_CLIENT_DATA', function ( event, clientDataObject ) { });

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