ADF开发之：指定空间范围Ajax查询

指定空间范围即Envelope异步Ajax查询地图上的POI点，并在表格中显示出查询的内容。

 

1. 前台HTML控件及Javascri脚本：

 

<input id="Button1" type="button" value="指定空间范围查询" onclick="spatialExtentSearch();" /></div>

<div id="queryTableContainer"></div>

 

 

<script type="text/ecmascript">

    function spatialExtentSearch()

    {       

        var envelope = "98,41,125,21";

        CallServer(envelope);        

    }

 

    function ReceiveServerData(rValue)

    {        

        document.getElementById("queryTableContainer").innerHTML = rValue;

    }

  </script>

 

 

2.服务器端C#代码如下：

 

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Text; namespace BoxSearchApp { public partial class _Default : System.Web.UI.Page, System.Web.UI.ICallbackEventHandler { protected String returnValue; protected void Page_Load(object sender, EventArgs e) { String cbReference = Page.ClientScript.GetCallbackEventReference(this, "arg", "ReceiveServerData", "context"); String callbackScript; callbackScript = "function CallServer(arg, context)" + "{ " + cbReference + ";}"; Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "CallServer", callbackScript, true); } public void RaiseCallbackEvent(String eventArgument) { string[] envelope = eventArgument.ToString().Split(new Char[] { ',' }); double xmin = Convert.ToDouble(envelope[0]); double ymin = Convert.ToDouble(envelope[1]); double xmax = Convert.ToDouble(envelope[2]); double ymax = Convert.ToDouble(envelope[3]); StringBuilder sb = new StringBuilder(); sb.Append("<table border='1px'>"); foreach (ESRI.ArcGIS.ADF.Web.DataSources.IGISFunctionality gisFunctionality in Map1.GetFunctionalities()) { ESRI.ArcGIS.ADF.Web.DataSources.IGISResource gisResource = gisFunctionality.Resource; bool supported = gisResource.SupportsFunctionality(typeof(ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality)); if (supported) { ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality queryFunctionality = (ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality)gisResource.CreateFunctionality (typeof(ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality), null); string[] layerIDs = null; string[] layerNames = null; queryFunctionality.GetQueryableLayers(null, out layerIDs, out layerNames); ESRI.ArcGIS.ADF.Web.Geometry.Envelope adfEnvelope = new ESRI.ArcGIS.ADF.Web.Geometry.Envelope(xmin, ymin, xmax, ymax); ESRI.ArcGIS.ADF.Web.SpatialFilter spatialFilter = new ESRI.ArcGIS.ADF.Web.SpatialFilter(); spatialFilter.Geometry = adfEnvelope; spatialFilter.ReturnADFGeometries = true; spatialFilter.MaxRecords = 10; System.Data.DataTable queryResultsDataTable = queryFunctionality.Query(gisFunctionality.Name, layerIDs[0], spatialFilter); queryResultsDataTable.TableName = gisResource.Name + "_" + layerNames[0]; for (int i = 0; i < queryResultsDataTable.Rows.Count; i++) { sb.Append("<tr>"); for (int j = 0; j < queryResultsDataTable.Columns.Count; j++) { sb.Append("<td>"); sb.Append(queryResultsDataTable.Rows[i][j].ToString()); sb.Append("</td>"); } sb.Append("</tr>"); } sb.Append("</table>"); } } returnValue = sb.ToString(); } public String GetCallbackResult() { return returnValue; } } }  

3.结果如下：