QueryTask练习

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" xmlns:esri="http://www.esri.com/2008/ags">
    <fx:Script>
        <![CDATA[
            import com.esri.ags.FeatureSet;
            import com.esri.ags.Graphic;
            
            import mx.controls.Alert;
            import mx.rpc.AsyncResponder;
            private function loadMapLayer(evt:Event):void
            {
                var layerInfo:Array;
                layerInfo=my.layerInfos;
                var layers:Array=new Array();
                for(var i:int=0;i<layerInfo.length;i++)
                {
                    layers.push({label:layerInfo[i].name,data:i});
                }
                layerList.dataProvider=layers;
            }
            private function doQuery():void
            {
                myGraphicsLayer.clear();
                queryTask.execute(query,new AsyncResponder(onResult,onFault));//一个异步调用方法，成功则响应onResult函数，失败则响应onFault函数
            }
            private function onResult(featureSet:FeatureSet,token:Object = null):void  //调用execute方法后查询结果返回一个FeatureSet，这里定义了
            {                                                                          result数组遍历获取FeatureSet中的要素
                var result:Array=new Array();
                for each(var graphic:Graphic in featureSet.features)
                {
                    myGraphicsLayer.add(graphic);
                    result.push({"洲名字":graphic.attributes.STATE_NAME,"2000人口":graphic.attributes.POP2000});
                }
                resultTable.dataProvider=result;
            }
            private function onFault(info:Object, token:Object=null):void
            {
                mx.controls.Alert.show("输入的查询语句不正确");
            }
        ]]>
    </fx:Script>
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
        <esri:Extent id="allUsa" xmin="-183.780014745329" ymin="16.2975638854873" xmax="-61.4068547410964" ymax="74.0304580085983"/>
        <esri:QueryTask id="queryTask"                       
                        showBusyCursor="true"
                        url="http://shibaizhong-pc/ArcGIS/rest/services/USA/MapServer/2"
                        useAMF="false"/>
        
        <esri:Query id="query"
                    outSpatialReference="{myMap.spatialReference}"
                    returnGeometry="true"
                    text="{qText.text}">
            <esri:outFields>                                //outField定义了Query查询返回哪些字段的内容
                <fx:String>STATE_NAME</fx:String>
                <fx:String>POP2000</fx:String>
            </esri:outFields>
        </esri:Query>

    </fx:Declarations>
    <s:layout>
        <s:HorizontalLayout/>
    </s:layout>
    <s:BorderContainer  height="100%" width="80%" borderStyle="solid" borderWeight="2" borderColor="#439AD7">
        <s:layout>
            <s:VerticalLayout paddingLeft="10" paddingTop="10">
                
            </s:VerticalLayout>
        </s:layout>
        <s:Panel height="64" width="100%">
            <s:layout>
                <s:HorizontalLayout paddingLeft="10" paddingTop="5"/>
            </s:layout>
            <mx:ComboBox id="layerList" width="117"></mx:ComboBox>
            <s:TextInput id="qText" width="223" text="Ca" enter="doQuery()"/>
            <s:Button label="查询" fontSize="12" click="doQuery()"/>
        </s:Panel>
        
        <esri:Map id="myMap" logoVisible="false" panArrowsVisible="true" extent="{allUsa}">
            
            <esri:ArcGISTiledMapServiceLayer id="Arc" url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer" />
            <esri:ArcGISDynamicMapServiceLayer id="my" url="http://shibaizhong-pc/ArcGIS/rest/services/USA/MapServer" creationComplete="loadMapLayer(event)">
                <esri:visibleLayers>
                    <mx:ArrayCollection/>
                </esri:visibleLayers>
            </esri:ArcGISDynamicMapServiceLayer>
            <esri:GraphicsLayer id="myGraphicsLayer"/>
        </esri:Map>
    </s:BorderContainer>
    <mx:DataGrid  id="resultTable"  height="100%" width="17%" borderStyle="solid" borderColor="#D6D7D8"/>
</s:Application>