南沙政府应急系统之GIS一张图（arcgis api for flex）讲解（六）地图搜索模块

config.xml文件的配置如下：

1        <widget label="地图搜索" icon="assets/images/emergency_resource_over.png"
2             config="widgets/Search/SearchWidget.xml" url="widgets/Search/SearchWidget.swf" />

源代码目录如下：

地图搜索模块的源代码原理解析，详细的代码在下载的开源flexviewer自带的：

大概的思路如下：SearchWidget.xml是地图搜索模块的配置文件，SearchWidget.mxml是widget；SearchWidget.xml主要是配置地图图层搜索的服务url，用来进行query查询用，这个模块的核心其实就是调用arcgis api的query类以及queryTask

SearchWidget.xml：

 1 <?xml version="1.0" ?>
 2 <configuration label="Louisville Parcels and Police">
 3     <layers>
 4         <layer>
 5             <name>兴趣点</name>
 6             <url>http://localhost:6080/ArcGIS/rest/services/nsResearch/MapServer/0</url>
 7             <expression>Name_CHN like '%[value]%'</expression>
 8             <textsearchlabel>按照名称搜索</textsearchlabel>
 9             <titlefield>Name_CHN</titlefield>
10             <linkfield></linkfield>
11             <fields all="false">
12                 <field name="Name_CHN"/>
13             </fields>
14         </layer>
15         <layer>
16             <name>道路</name>
17             <url>http://localhost:6080/ArcGIS/rest/services/nsResearch/MapServer/1</url>
18             <expression>Name_CHN like '%[value]%'</expression>
19             <textsearchlabel>按照名称搜索</textsearchlabel>
20             <titlefield>Name_CHN</titlefield>
21             <linkfield></linkfield>
22             <fields all="false">
23                 <field name="Name_CHN"/>
24             </fields>
25         </layer> 
26         <layer>
27             <name>区镇街</name>
28             <url>http://localhost:6080/ArcGIS/rest/services/nsResearch/MapServer/5</url>
29             <expression>Name_CHN like '%[value]%'</expression>
30             <textsearchlabel>按照名称搜索</textsearchlabel>
31             <titlefield>Name_CHN</titlefield>
32             <linkfield></linkfield>
33             <fields all="false">
34                 <field name="Name_CHN"/>
35             </fields>
36         </layer>
37         <layer>
38             <name>社区街道</name>
39             <url>http://localhost:6080/ArcGIS/rest/services/nsResearch/MapServer/3</url>
40             <expression>Name_CHN like '%[value]%'</expression>
41             <textsearchlabel>按照名称搜索</textsearchlabel>
42             <titlefield>Name_CHN</titlefield>
43             <linkfield></linkfield>
44             <fields all="false">
45                 <field name="Name_CHN"/>
46             </fields>
47         </layer> 
48         <layer>
49             <name>村居委</name>
50             <url>http://localhost:6080/ArcGIS/rest/services/nsResearch/MapServer/4</url>
51             <expression>Name_CHN like '%[value]%'</expression>
52             <textsearchlabel>按照名称搜索</textsearchlabel>
53             <titlefield>Name_CHN</titlefield>
54             <linkfield></linkfield>
55             <fields all="false">
56                 <field name="Name_CHN"/>
57             </fields>
58         </layer>      
59         <layer>
60             <name>水域河流名称</name>
61             <url>http://localhost:6080/ArcGIS/rest/services/nsResearch/MapServer/2</url>
62             <expression>Name_CHN like '%[value]%'</expression>
63             <textsearchlabel>按照名称搜索</textsearchlabel>
64             <titlefield>Name_CHN</titlefield>
65             <linkfield></linkfield>
66             <fields all="false">
67                 <field name="Name_CHN"/>
68             </fields>
69         </layer>
70         <layer>
71             <name>所有</name>
72             <url></url>
73             <expression>Name_CHN like '%[value]%'</expression>
74             <textsearchlabel>按照名称搜索</textsearchlabel>
75             <titlefield>Name_CHN</titlefield>
76             <linkfield></linkfield>
77             <fields all="false">
78                 <field name="Name_CHN" />
79             </fields>
80         </layer>
81     </layers>
82     <zoomscale>10000</zoomscale>
83 </configuration>
84 
85 <!--
86     See Search widget tag reference at
87     http://links.esri.com/searchwidget
88 -->

SearchWidget.mxml：具体实现部分，我截图部分代码好了，具体的详见flexviewer，首先是利用在地图框选（线 面 拉框等等）获取框选的范围Geometry，然后利用当前的Geometry作为queryTask的参数，用于query查询。

 1           private function activateDrawTool(event:MouseEvent):void
 2             {
 3                 addSharedData("Deactivate_DrawTool", null); // to be able to deactivate drawTool on other widgets
 4 
 5                 // apply glow
 6                 selectedDrawingIcon = FocusableImage(event.currentTarget);
 7                 clearSelectionFilter();
 8                 selectedDrawingIcon.filters = [ glowFilter ];
 9 
10                 finishDrawing = false;
11 
12                 var status:String;
13                 var value:String = selectedDrawingIcon.name;
14                 switch (value)
15                 {
16                     case DrawTool.MAPPOINT:
17                     {
18                         status = pointLabel;
19                         drawSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE, 15, 0x3FAFDC, 1);
20                         break;
21                     }
22                     case DrawTool.POLYLINE:
23                     {
24                         status = lineLabel;
25                         drawSymbol = new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, 0x3FAFDC, 1, 1);
26                         break;
27                     }
28                     case DrawTool.EXTENT:
29                     {
30                         status = rectangleLabel;
31                         drawSymbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID, 0x3FAFDC, 0.5, new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, 0x3FAFDC, 1, 1));
32                         break;
33                     }
34                     case DrawTool.POLYGON:
35                     {
36                         status = polygonLabel;
37                         drawSymbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID, 0x3FAFDC, 0.5, new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, 0x3FAFDC, 1, 1));
38                         break;
39                     }
40                 }
41                 setMapAction(value, status, drawSymbol, searchDrawEnd);
42             }

 1             private function searchDrawEnd(event:DrawEvent):void
 2             {
 3                 // deactivate the draw tool
 4                 finishDrawing = true;
 5 
 6                 selectedDrawingIcon = null;
 7                 clearSelectionFilter();
 8 
 9                 event.target.deactivate();
10                 var geom:Geometry = event.graphic.geometry;
11 
12                 if (geom is Polygon && GeometryUtil.polygonSelfIntersecting(geom as Polygon))
13                 {
14                     geometryService.simplify([ geom ]);
15                 }
16                 else
17                 {
18                     //to improve search results
19                     if (geom.type == Geometry.MAPPOINT)
20                     {
21                         geom = createExtentAroundMapPoint(geom as MapPoint, pointSearchTolerance);
22                     }
23 
24                     queryFeaturesGraphical(geom);
25                 }
26             }

 1             queryGeom = geom;
 2                 queryFields = searchLayer.fields;
 3                 queryTitleField = searchLayer.titlefield;
 4                 queryLinkField = searchLayer.linkfield;
 5                 queryLinkAlias = searchLayer.linkalias;
 6                 
 7                 if (queryLayer)
 8                 {
 9                     var query:Query = new Query();
10                     query.geometry = queryGeom;
11                     query.spatialRelationship = Query.SPATIAL_REL_INTERSECTS;
12                     query.outSpatialReference = map.spatialReference;
13                     
14                     const supportsServerSideSorting:Boolean = queryLayer.layerDetails
15                         && queryLayer.layerDetails.version >= 10.1
16                         && queryLayer.layerDetails.supportsAdvancedQueries;
17                     const orderByFields:Array = searchLayer.orderbyfields;
18                     if (supportsServerSideSorting && orderByFields)
19                     {
20                         query.orderByFields = orderByFields;
21                     }
22                     
23                     var queryOptions:Object =
24                         {
25                             supportsServerSideSorting: supportsServerSideSorting,
26                             orderByFields: orderByFields,
27                             queryFields: queryFields
28                         };
29                     
30                     queryLayer.queryFeatures(
31                         query, new AsyncResponder(queryFeatures_resultHandler,
32                             queryFeatures_faultHandler,
33                             queryOptions));
34                     
35                     showMessage(loadingLabel, true);
36                     showStateResults();
37                 }

 1          private function queryFeatures_resultHandler(featureSet:FeatureSet, queryOptions:Object):void
 2             {
 3                 try
 4                 {
 5                     if (!queryOptions.supportsServerSideSorting && queryOptions.orderByFields)
 6                     {
 7                         FeatureSetUtil.sortFeaturesByFieldName(featureSet, queryOptions.orderByFields);
 8                     }
16                     if(searchResultAC==null)searchResultAC=new ArrayCollection();
17                     total++;
18                     searchResultAC.addAll(createSearchResults(featureSet, queryOptions.queryFields));
19 
20                     addSharedData(widgetTitle, searchResultAC);
21                     if (featureSet.features.length < 1)
22                     {
23                         showMessage(noResultLabel, false);
24                     }
25                     else
26                     {
27                         showMessage(selectionLabel + " " + searchResultAC.length, false);
28                     }
29                 }
30                 catch (error:Error)
31                 {
32                     showMessage(error.message, false);
33                 }    
66                 
67             }

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