javascript - angular-当参数之一为空数组时出现奇怪的错误“无法读取未定义的属性”

这是引发问题的行：

submitInfo(groups, $scope.Tab, other, drug, "Saved", false)
                .then(function () {
                })

奇怪的是，可以识别SubmitInfo（这是一种注入服务）（我在那里设置了一个断点）。仅当组为空数组时，才会引发此错误。我不明白为什么会这样或如何防止它。我希望即使组为空也要执行该功能。

这是submitInfo：

summariesApp.factory('submitInfo', ['$http', '$q', 'validate', 'getInfo', '$rootScope', 'toaster', function ($http, $q, validate, getInfo, $rootScope, toaster) {
    return function (groups, Tab, other, drug, state, auto) {
        var deferred = $q.defer();

        if (groups.length == 0) {
            return;
        }

        if (state != "Saved") {
            if (!validate(groups, Tab, other, drug, "submit")) {
                return;
            }
        }

        var deferral = $q.defer();

        $http({
            url: "ThirtySecond.aspx/SubmitSummary",
            method: "POST",
            data: { type: Tab, groups: groups, summaryState: state, other: other, drug: drug },
            headers: { 'Content-Type': 'application/json; charset=utf-8' }
        })
        .success (
            function () {

                getInfo(Tab, other, drug)
                .then(function (data) {
                    var newGroups = data;
                    for (i = 0; i < groups.length; i++) {
                        var group = groups[i];
                        var newGroup = $rootScope._.find(newGroups, 'Grouptype', group.Grouptype);
                        newGroup.show = group.show;
                        newGroup.Checked = group.Checked;
                    }

                    switch (state) {
                        case "Saved":
                            if (auto) {
                                successMessage = "Auto Saved";
                            }
                            else {
                                successMessage = "Saved";
                            }
                            break;
                        case "SubmittedForReview":
                            successMessage = "Submitted for review";
                            break;
                        case "NoSummaryWarranted":
                            successMessage = "Summary updated as 'No Summary Warranted'";
                            break;
                        case "FinalizedButNotRolledOut":
                            successMessage = "Summary updated as 'Finalized but not ready to roll out'";
                            break;
                        case "Finalized":
                            successMessage = "Summary finalized";
                            break;
                        default:
                            successMessage = "Draft Entered";
                    }
                    toaster.pop('success', "Updated", successMessage);

                    angular.extend(groups, newGroups);
                    deferral.resolve(true);
                })
            }
        )
        .error(
            function () {
                toaster.pop('error', "Error!", "Something went wrong. Please contact the administrator.");
                deferral.reject(true);
            }
        )
        return deferral.promise;
    }
}]);

最佳答案

由于使用了submitInfo语句，undefined返回了return;

if (groups.length == 0)
{
    return;
}

将所有return;替换为return deferred.promise;（因为deferral尚不可用），您的代码应该可以正常工作。

如果您无法更改submitInfo，也可以在使用||调用函数时建立后备（基于undefined评估为false的事实）：

(submitInfo(groups, $scope.Tab, other, drug, "Saved", false) || /* get your promise here */)
            .then(function () {
            })

（我不确定，要实现承诺的代码是$scope.Tab.defer().promise还是summariesApp.factory弄乱了参数？）

关于javascript - angular-当参数之一为空数组时出现奇怪的错误“无法读取未定义的属性”，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/29899218/