Query result in table

最新推荐文章于 2021-08-31 02:45:39 发布

原创最新推荐文章于 2021-08-31 02:45:39 发布 · 135 阅读

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本文介绍了一种利用QueryTask组件从服务器查询地理信息的方法，并通过DataGrid展示查询结果。示例中设置了一个无需地图即可运行的QueryTask，用户输入州名后点击按钮，系统即会返回与该州相关的统计数据。

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<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:mx="library://ns.adobe.com/flex/mx"
               xmlns:esri="http://www.esri.com/2008/ags"
               xmlns:s="library://ns.adobe.com/flex/spark"
               pageTitle="Query Task (without a map)">
    <!--
         This sample shows how to query the server and displaying
         the result in a datagrid.
         The query is sent using the execute() method on a QueryTask.

         This sample sets up a QueryTask (what layer on what server to query).
         When the user clicks the "Get Details" button, a Query is sent with
         the user-provided text to search for.
         Meanwhile a DataGrid has been created which listens for the results
         (using executeLastResult) from the querytask.
    -->

    <s:layout>
        <s:VerticalLayout horizontalAlign="center" paddingTop="25"/>
    </s:layout>

    <fx:Declarations>
        <esri:QueryTask id="queryTask"
                        url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5"
                        useAMF="false"/>
        <esri:Query id="query"
                    outFields="[STATE_NAME,STATE_FIPS,SUB_REGION,STATE_ABBR,POP2000,POP2007]"
                    returnGeometry="false"
                    text="{stateName.text}"/>
    </fx:Declarations>

    <s:Panel title="Using Query tasks without maps">
        <s:layout>
            <s:VerticalLayout/>
        </s:layout>
        <s:HGroup verticalAlign="middle">
            <s:Label text="US state name: "/>
            <s:TextInput id="stateName" text="Carolina"/>
            <s:Button click="queryTask.execute(query);" label="Get Details"/>
        </s:HGroup>
        <mx:DataGrid id="resultsGrid"
                     dataProvider="{queryTask.executeLastResult.attributes}"
                     visible="{queryTask.executeLastResult != null}">
            <mx:columns>
                <mx:DataGridColumn dataField="STATE_NAME" headerText="State Name"/>
                <mx:DataGridColumn dataField="SUB_REGION" headerText="Region"/>
                <mx:DataGridColumn dataField="STATE_FIPS" headerText="FIPS"/>
                <mx:DataGridColumn dataField="STATE_ABBR" headerText="Abbreviation"/>
                <mx:DataGridColumn dataField="POP2000" headerText="Population 2000"/>
                <mx:DataGridColumn dataField="POP2007" headerText="Population 2007"/>
            </mx:columns>
        </mx:DataGrid>
    </s:Panel>
</s:Application>