javascript – AngularJS – ForEach不循环

2023年10月14日 155次阅读

问题

我有一个AngularJS应用程序,由于某种原因,我的一个forEach循环不起作用.循环似乎在单击按钮上的a函数时起作用,但在初始加载时它不起作用.

码

所以我正确地为页面设置了控制器.我正在调用我的服务中的一个函数,该函数触发我的API并返回一个数组：

调节器

var holidaysnew = getUserEventsById.getUserEventsById();

服务

app.service('getUserEventsById', function ($http) {  

this.getUserEventsById = function () {
    var holidays = [];


    $http.get("http://localhost:9847/AceTracker.svc/GetAllEventsByUser?user_id=1").success(function (data) {
        for (var key in data.GetAllEventsByUserResult) {
            if (data.GetAllEventsByUserResult.hasOwnProperty(key)) {
                holidays.push(data.GetAllEventsByUserResult[key])
            }
        }
    });
    return holidays;
};
});

所以在初始页面加载holidaynew成功命中并且是一系列假期.线下面是我的forEach循环,我想循环遍历holidaysnew但它似乎没有进入循环.

循环编码如下：

holidaysnew.forEach(function (hol) {
    $scope.eventSources[0].events.push({
        end: $filter('dateFilter')(hol.HOLIDAY_END),
        start: $filter('dateFilter')(hol.HOLIDAY_START),
        title: hol.HOLIDAY_TITLE,
        color: $filter('colorEventFilter')(hol.HOLIDAY_EVENT_STATE_ID)
    });
});

我有console.log的holidaysnew数组,它肯定会被填充.有谁能看到这个问题？

编辑：

该服务似乎没问题,并按预期返回阵列(见下文)

《javascript – AngularJS – ForEach不循环》

但是当$scope.eventSources [0] .events = holidayEvents;代码运行它实际上似乎没有设置事件.

holidayEvents是一个数组吗？

EDIT2：

以下是返回给服务的JSON示例：

{"GetAllEventsByUserResult":[{"HOLIDAY_END":"\/Date(1456358400000+0000)\/","HOLIDAY_EVENT_ID":1,"HOLIDAY_EVENT_STATE_ID":1,"HOLIDAY_START":"\/Date(1455926400000+0000)\/","HOLIDAY_TITLE":"Spain     ","USER_ID":1},{"HOLIDAY_END":"\/Date(1454371200000+0000)\/","HOLIDAY_EVENT_ID":2,"HOLIDAY_EVENT_STATE_ID":2,"HOLIDAY_START":"\/Date(1454284800000+0000)\/","HOLIDAY_TITLE":"Italy     ","USER_ID":1},{"HOLIDAY_END":"\/Date(1458000000000+0000)\/","HOLIDAY_EVENT_ID":3,"HOLIDAY_EVENT_STATE_ID":1,"HOLIDAY_START":"\/Date(1457568000000+0000)\/","HOLIDAY_TITLE":"Germany   ","USER_ID":1},{"HOLIDAY_END":"\/Date(1481068800000+0000)\/","HOLIDAY_EVENT_ID":4,"HOLIDAY_EVENT_STATE_ID":3,"HOLIDAY_START":"\/Date(1480896000000+0000)\/","HOLIDAY_TITLE":"England   ","USER_ID":1}]}

最佳答案 这看起来像处理您的REST响应时出错.由于REST调用是异步的,因此数组的填充发生在return语句之后.尝试将无效的循环移动到自己的函数中,然后在REST成功回调中调用该函数,或者返回Promise并在成功回调中解析它.

回复承诺：

app.service('getUserEventsById', function ($http, $q) {  

    this.getUserEventsById = function () {
        var deferred = $q.defer();
        var holidays = [];


        $http.get("http://localhost:9847/AceTracker.svc/GetAllEventsByUser?user_id=1").then(function (data) {
            for (var key in data.GetAllEventsByUserResult) {
                if (data.GetAllEventsByUserResult.hasOwnProperty(key)) {
                    holidays.push(data.GetAllEventsByUserResult[key])
                }
            }
            deferred.resolve(holidays);
        });
        return deferred.promise;
    };
});

循环承诺：

holidaysnew.then(function(holidays) {
    holidays.forEach(function (hol) {
        $scope.eventSources[0].events.push({
            end: $filter('dateFilter')(hol.HOLIDAY_END),
            start: $filter('dateFilter')(hol.HOLIDAY_START),
            title: hol.HOLIDAY_TITLE,
            color: $filter('colorEventFilter')(hol.HOLIDAY_EVENT_STATE_ID)
        });
    });
});
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