Jquery 在ArcGIS JS中使用要素/多边形的子查询

本质上，我正在尝试对前一个查询返回的结果集执行第二个空间查询。源代码运行，但它不会返回第二个for循环中的floodCalcs.businessF的任何结果。我没有从中得到任何错误，我会检查以确保多边形已加载到多边形中（这是一个全局变量）

queryShapes=函数（）{
对于（var v=0；v

查询任务.execute函数返回一个

延迟的
。这本质上意味着在执行函数之前，将在
queryBlock
之后执行for循环。因此，当您在
多边形中循环时，它将是空的

另外，
f.featureSet.features[i].geometry
已经是一个
Polygon
，您不需要再创建一个新的

试试这样的


var q=newquery（）；
q、 几何体=形状[v]。getExtent（）；
q、 其中=“1=1”；
q、 outSpatialReference=map.spatialReference；
q、 外场=[“*”]；
q、 返回几何=真；
var qTask=新的查询任务（“指定URL”）；
var promise=qTask.execute（q）；
qTask.on（“完成”，queryBlock）；
//使用用户绘制的形状查询泛洪层，并将返回的特征转换为多边形
函数queryBlock（f）{
对于（变量i=0；i

queryShapes = function () {
            for (var v = 0; v < shapes.length; v++) {

                query = new Query();                    
                select = shapes[v];
                query.geometry = shapes[v].getExtent();
                query.returnGeometry = true;

                businessLayer.queryFeatures(query, selectBusiness);
                //featureLayer.queryFeatures(query, selectInBuffer);  

                //perform query on business layer using user drawn shape's bounding box (extent)
                function selectBusiness(response) {
                    var feature;
                    var features = response.features;
                    var floodFeatures = [];
                    var floodFeature;
                    var inBuffer = [];
                    var floodBuffer = [];

                    var q = new Query();
                    q.geometry = shapes[v].getExtent();
                    q.where = "1=1";
                    q.outSpatialReference = map.spatialReference;
                    q.outFields = ["*"];
                    q.returnGeometry = true;
                    var qTask = new QueryTask("ommitted URL");
                    qTask.execute(q);
                    qTask.on("complete", queryBlock);
                    //query flood layer using user drawn shapes and cast the returned features as polygons
                    function queryBlock(f) {                           
                        for (var i = 0; i < f.featureSet.features.length; i++) {
                            polygons.push(new Polygon({ "rings": f.featureSet.features[i].geometry.rings, "spatialReference": f.featureSet.features[i].geometry.spatialReference }));
                        }                          
                    }

                    //filter out features that are not actually in buffer, since we got all points in the buffer's bounding box
                    for (var c = 0; c < features.length; c++) {
                        feature = features[c];
                        if (shapes[v].contains(feature.geometry)) {
                            inBuffer.push(feature.attributes[businessLayer.objectIdField]);
                        }
                        //use flood polygons that were returned in queryBlock function to find points in flood zones
                            for (var b = 0; b < polygons.length; b++) {
                                var poly = polygons[b];
                            if (poly.contains(feature.geometry)) {
                                floodCalcs.businessF += 1;
                            }
                        }
                    }



                    var subQuery = new Query();
                    subQuery.objectIds = inBuffer;
                    //use a fast objectIds selection query (should not need to go to the server)
                    featureLayer.selectFeatures(subQuery, FeatureLayer.SELECTION_NEW, function (results) {
                        floodCalcs.business += sumPopulation(results);                           
                    });

                }
                function sumPopulation(features) {
                    var popTotal = 0;
                    popTotal = features.length;
                    return popTotal;
                }

            }


        }