Question

在Infinite-scroll工厂下面我用来从后端获取数据，是否有任何地方对这个方法应用$ promise，因为在控制器中我需要知道数据何时加载完毕。

工厂：

app.factory('Gallery', function($http) {
   var Gallery = function(media, album_type) {
        this.items = [];
        this.busy = false;
        this.next = '/upload/list/'+ media +'/?album='+album_type+'&page=1';
        this.end=false;
    };

    Gallery.prototype.nextPage = function() {
        if (this.busy) return;
        this.busy = true;
        if (this.next){
            var url = this.next;
        }
        else{
            this.end=true;
            this.busy = false;
            return
        }
        $http.get(url).success(function(data) {
            var items = data.results;
            for (var i = 0; i < items.length; i++) {
                this.items.push(items[i]);
            }
            this.next=data.next;
            this.busy = false;
            if (!data.next)
                this.end=true;
            this.count=data.count;
        }.bind(this));
    };

    return Gallery;
});

在控制器中;

   $scope.images = $scope.images || new ScrollGallery('image', 'CRP');

Answer 1

我通过在ininite-service中添加$ q来解决问题，$ q返回promise方法。我可以用来检查http是否成功失败。

无限服务::

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

    var Gallery = function(url) {
        this.items = [];
        this.busy = false;
        this.next = url;
        this.end = false;
        this.extra = {};

    };

    Gallery.prototype.nextPage = function() {
        var def = $q.defer();
        if (this.busy)
            return;
        this.busy = true;
        if (this.next) {
            var url = this.next;
        } else {
            this.end = true;
            this.busy = false;
            return;
        }
        $http.get(url).success( function(data) {

            var items = data.results;
            var extra = [];
            if ( typeof data.extra != 'undefined') {
                extra = data.extra;
            }

            for (var i = 0; i < items.length; i++) {
                this.items.push(items[i]);
            }
            this.extra = extra;
            this.next = data.next;
            this.busy = false;
            if (!data.next)
                this.end = true;
            this.count = data.count;
              def.resolve(data);
        }.bind(this));
        return def.promise;
    };

    return Gallery;
});

在控制器::

中

$scope.mediacontent[$scope.slider_url] =new ScrollGallery($scope.slider_url_pass); 
        $scope.mediacontent[$scope.slider_url].nextPage().then(function(albums) {

                $scope.mediacontent[$scope.slider_url].items[$scope.img_no].active=true;

                console.log('albums returned to controller.');
            },
            function(data) {
                console.log('albums retrieval failed.');
            });

知道数据何时完成从无限卷轴工厂加载（承诺）

1 个答案: