AngularJS - 使用$ routeProvider:resolve拒绝$ http承诺

Question

我试图resolve在a $routeProvider中仅在$http请求完成时显示新路由.如果请求成功,则解析$ http.post()产生的承诺并呈现视图.但是如果请求失败(例如,超时或内部错误),则永远不会解析承诺,并且永远不会呈现视图.我如何使用resolve？处理请求失败？

下面代码中最重要的部分是:

app.js

$routeProvider.when('/warrantyResult', {
    templateUrl : 'partials/warranty-result.html',
    controller : 'WarrantyResultCtrl',
    resolve : {
        response : [ 'Warranty', function(Warranty) {
            return Warranty.sendRequest();
        } ]
    }
});

controllers.js

angular.module('adocDemo.controllers', []).controller('HomeCtrl', [ '$scope', function($scope) {

} ]).controller('WarrantyCtrl', [ '$scope', '$http', '$location', 'Warranty', function($scope, $http, $location, Warranty) {
    $scope.submitWarranty = function() {
        $scope.loading = true;
        Warranty.setRequestData($scope.data);
        $location.path('/warrantyResult');
    };
} ]).controller('WarrantyResultCtrl', [ '$scope', 'Warranty', function($scope, Warranty) {

    $scope.request = Warranty.getRequestData();
    $scope.response = Warranty.getResponseData();
} ]);

services.js

angular.module('adocDemo.services', []).factory('Warranty', [ '$http', '$timeout', function($http, $timeout) {
    /**
     * This service is used to query the Warranty Webmethod. The sendRequest
     * method is automaticcaly called when the user is redirected to
     * /warrantyResult route.
     */
    var isDataSet = false;
    var requestData = undefined;
    var responseData = undefined;
    return {
        setRequestData : function(data) {
            //Setting the data
            isDataSet = true;
        },
        getRequestData : function() {
            return requestData;
        },
        sendRequest : function(data) {
            if(isDataSet) {
                var request = $http.post('url/to/webservice', requestData);
                request.success(function(data) {
                    responseData = data;
                });
                return request;
            }   
        },
        getResponseData : function() {
            return responseData;
        }
    };
} ]);

我知道我可以在$ http调用周围使用promise并解决它,即使请求失败,但我想知道是否有更简单的解决方案.

感谢阅读,并希望,帮助:)

Answer 1

我认为从中做到这一点的唯一方法resolve是手动解决返回的承诺Warranty.sendRequest并将其重新包装在新的承诺中:

resolve : {
  response : [ 'Warranty' '$q', function(Warranty, $q) {
    var dfd = $q.defer();

    Warranty.sendRequest().then(function(result) {
      dfd.resolve({ success: true, result : result });
    }, function(error) {
      dfd.resolve({ success : false, reason : error });
    });

    return dfd.promise;

  } ]
}

在WarrantyResultCtrl,您可以检查是否发生错误并生成重定向.

编辑:更清洁的解决方案:

// WarrantyCtrl
$scope.$on('$routeChangeError', function() {
  // handle the error
});
$scope.submitWarranty = function() {
    $scope.loading = true;
    Warranty.setRequestData($scope.data);
    $location.path('/warrantyResult');
};

(plunker演示)

Answer 2

经过深入搜索，我找不到解决这个问题的方法。

我决定在路由定义中删除解析语句，并在 WarrantyCtrl 中使用以下代码片段。

$scope.submitWarranty = function() {
    $scope.formatUserData();
    if ($scope.verifyUserData()) {
        $scope.loading = true;
        Warranty.setRequestData($scope.data);
        Warranty.sendRequest().success(function() {
            $location.path('/warrantyResult');
        }).error(function() {
            $location.path('/webserviceError');
        });
    }
};

不是很聪明，但按预期工作......如果有人仍然有原始问题的解决方案，我会很高兴阅读它！