ArcGis for flex查询FeatureLayer数据

1. 首先实例化一个FeatureLayer对象

private var featureLayer:FeatureLayer=new FeatureLayer();

2.指定FeatureLayer对象的url和输出字段

featureLayer.url = FeatureURL; featureLayer.outFields=["OBJECTID","CREATETIME"];（这里的字段用于在地图上展示时使用）

3. 定义查询条件和查询返回的字段（进行查询时必须有查询条件，如果没有则查不到数据）

var query:Query=new Query(); query.where="1=1";

query.outFields=["OBJECTID","CREATETIME"];（这里的字段可以用于显示在表格中）

4. 进行异步查询

featureLayer.queryFeatures(query,new AsyncResponder(resulthandler,faulthandler));

5. 对返回数据进行处理

private function resulthandler(result:FeatureSet,token:Object):void{ tipLayer.clear();//每次查询之后清除图标图层内容，重新添加 resultAC.source=result.attributes; graphicAC.source=result.features; featureLayer.graphicProvider=graphicAC; for each (var graphic:Graphic in result.features){ graphicLayer.add(graphic); graphic.symbol = new SimpleLineSymbol("solid",0xFF0000,1,3); //鼠标移动到道路线段上时显示手型，同时添加点击显示气泡的事件 graphic.useHandCursor = true; graphic.buttonMode = true; graphic.mouseChildren = false; graphic.addEventListener(MouseEvent.CLICK,gisinfoWin.mouseOverGraphicTOMS); //添加道路标注 var word:String = graphic.attributes.ROADSECTIONNAME; var fmt:TextFormat = new TextFormat(); fmt.size = 12; fmt.color = 0xffffff; var symbolWord:TextSymbol = new TextSymbol(null,word,0xffffff,true,0xffffff,true,0x0131c0,TextSymbol.PLACEMENT_MIDDLE,0,0,-25,fmt); symbolWord.backgroundColor = 0x999933; //获取中心点 var center:MapPoint = graphic.geometry as MapPoint; if(graphic.geometry != null && graphic.geometry.type != Geometry.MAPPOINT){ center = graphic.geometry.extent.center; //区域中心点 //交通组织的中心点设置为起点，标注文字 var line:Polyline = graphic.geometry as Polyline; if(line != null){ try { var arrPoints:Array = line.paths[0]; center = arrPoints[0] as MapPoint; }catch(e){} } } if(center != null) { var tipGraphic:Graphic = new Graphic(center); tipGraphic.attributes = graphic.attributes; tipGraphic.useHandCursor = true; tipGraphic.buttonMode = true; tipGraphic.mouseChildren = false; tipGraphic.symbol = symbolWord; //添加鼠标事件 tipGraphic.addEventListener(MouseEvent.CLICK,gisinfoWin.mouseOverGraphicTOMS); tipLayer.add(tipGraphic); //施工占道需要添加小人在地图上 var tomsPic:PictureMarkerSymbol; if(graphic.attributes.TOMSTYPEID=="02"){ tomsPic = new PictureMarkerSymbol(IconDir+"dev/fs_toms_02.png",this.defaultMarkWidth/2,this.defaultMarkHeight/2); //偏移的位置 }else{ tomsPic = new PictureMarkerSymbol(IconDir+"dev/fs_toms_01.png",this.defaultMarkWidth/2,this.defaultMarkHeight/2); //偏移的位置 } var arrGraphic:Array = [new Graphic(center)]; //默认的绘制点 if(graphic.geometry.type == Geometry.POLYLINE) { var line:Polyline = graphic.geometry as Polyline; var arrPoints:Array = line.paths[0]; arrGraphic = []; //只标记前 1 个点，或者两个点 arrGraphic.push(new Graphic(arrPoints[0])); if(arrPoints.length > 2){ arrGraphic.push(new Graphic(arrPoints[1])); } } for each(var markGraphic:Graphic in arrGraphic){ markGraphic.symbol = tomsPic; markGraphic.attributes = graphic.attributes; //地图上点位显示手型 markGraphic.useHandCursor = true; markGraphic.buttonMode = true; markGraphic.mouseChildren = false; //添加鼠标事件 markGraphic.addEventListener(MouseEvent.CLICK,gisinfoWin.mouseOverGraphicTOMS); // if(token.fnRollOver != undefined && token.fnRollOver != null){ // markGraphic.addEventListener(MouseEvent.ROLL_OVER, token.fnRollOver); // } // if(token.fnMouseOver != undefined && token.fnMouseOver != null){ // markGraphic.addEventListener(MouseEvent.MOUSE_OVER,token.fnMouseOver); // } tipLayer.add(markGraphic); } } } }

因为FeatureLayer图层是不可以修改样式的，所以我将返回来的数据添加到GraphicsLayer图层中进行编辑。如果不修改样式的话，可以直接将FeatureLayer添加到地图中来展示。

6.将图层添加到地图实例上以进行最终展示

this.map.addLayer(graphicLayer);