Question

我有一个控制器和服务。

服务执行http.get并在成功时返回true，如果错误则返回false。

但是，在控制器中，它正确接收true或false，但绑定的html始终显示为true ??

控制器：

app.controller('MyController', function($scope, MyService) {

    MyService.getData(function(isLoggedIn, userData) {

        var loggedIn = isLoggedIn;    
        $scope.isLoggedIn = loggedIn;
        $scope.myUser = userData;
        //$scope.$evalAsync();
        //$scope.$apply();            
    });    
});

app.factory('MyService', function($http, $q) {
    return {

        getData: function(isLoggedIn, userModel) {
            $http.get('../assets/data/data.json')
                .success(function(data) {
                    userModel(data);
                    isLoggedIn(true);
                })
                .error(function(data, status, headers, config) {
                    // If 400 or 404 are returned, the user is not signed in.
                    if (status == 400 || status == 401 || status == 404) {
                        isLoggedIn(false);
                    }                    
                });
        }
    }
});

HTML：

{{isLoggedIn}}

在上文中，{{isLoggedIn}}始终为真。即使我将http调用修改为：

$http.get('../blah/blah/blah.json')

强迫.error /失败。

我已经尝试了$ scope。$ apply（）并且我一直在收到正在进行的摘要周期的错误。帮助！

Answer 1

我认为你对回调的运作方式感到有些困惑。您服务中的isLoggedIn参数是您传入的回调函数。您的代码已更正：

app.controller('MyController', function($scope, MyService) {

    /*
    The function(response) { is your callback function being passed to the service
    */
    MyService.getData(function(response) {
        var loggedIn = response.isLoggedIn;    
        $scope.isLoggedIn = loggedIn;
        $scope.myUser = response.userModel;           
    });    
});

app.factory('MyService', function($http, $q) {
    return {
        getData: function(callback) {
            $http.get('../assets/data/data.json')
                .success(function(data) {
                    //Execute your callback function and pass what data you need
                    callback({userModel: data, isLoggedIn: true});
                })
                .error(function(data, status, headers, config) {
                    // If 400 or 404 are returned, the user is not signed in.
                    if (status == 400 || status == 401 || status == 404) {
                        callback({isLoggedIn: false});
                    }                    
                });
        }
    }
});

你应该使用承诺......这里是一个更加重构的版本：

app.controller('MyController', function($scope, MyService) {
    MyService.getData().then(function(response) {
        var loggedIn = response.isLoggedIn;    
        $scope.isLoggedIn = loggedIn;
        $scope.myUser = response.userModel;           
    });    
});

app.factory('MyService', function($http, $q) {
    return {
        getData: function() {
            return $http.get('../assets/data/data.json')
                .then(function(response) {
                    return {
                        userModel: response.data, 
                        isLoggedIn: true
                    };
                }, function(data, status, headers, config) {
                    // If 400 or 404 are returned, the user is not signed in.
                    if (status == 400 || status == 401 || status == 404) {
                        return {isLoggedIn: false};
                    }                    
                });
        }
    }
});

服务调用后角度范围不更新

1 个答案: