[英]Arcgis javascript api-Getting polygon geometry
I am working with ArcGis javascript api 3.2. 我正在使用ArcGis javascript API 3.2。 I have a map and a layer over it.
我有一张地图,上面有一层。 How would i get the polygon geometry inside which the mouse click event occurs?
如何获得发生鼠标单击事件的多边形几何?
Not just the polygon id, you could get any parameter from a map service by doing this... 不仅是多边形ID,执行此操作还可以从地图服务中获取任何参数...
1)Create a new IdentifyTask() by passing the MapService as the parameter. 1)通过传递MapService作为参数来创建一个新的IdentifyTask()。
identifyTask = new esri.tasks.IdentifyTask("<Map Service URL should go here>");
2)Create a new IdentifyParameters() and set the following attributes. 2)创建一个新的IdentifyParameters()并设置以下属性。
identifyParams = new esri.tasks.IdentifyParameters();
identifyParams.tolerance = 2;
identifyParams.returnGeometry = true;
identifyParams.layers = esri.tasks.IdentifyParameters.LAYER_OPTION_ALL;
identifyParams.layerIds = [0,1,2,3,4];
identifyParams.sr=map.spatialreference;
identifyParams.width = map.width;
identifyParams.height = map.height;
3) A method should be invoked upon mouse click. 3)鼠标单击时应调用一种方法。 You can do that like
你可以那样做
dojo.connect(map, "onClick", uponClick);
4) When a polygon is clicked, uponClick() method will be called. 4)单击多边形时,将调用onClick()方法。 Inside the uponClick() method, call the identifyTask.execute by passing identifyParams as parameter.
在onClick()方法内部,通过传递identifyParams作为参数来调用identifyTask.execute。
function uponClick(evt){
identifyParams.geometry = evt.mapPoint;
identifyParams.mapExtent = map.extent;
identifyTask.execute(identifyParams, function(result) {
for(var i=0; i<result.length; i++){
polyId=result[i].feature.attributes["UNIQPOLYID"];
}//end of for
});//end of execute
}//end of uponClick
UNIQPOLYID is one of those methods that the map service would return. UNIQPOLYID是地图服务将返回的那些方法之一。
You could find a detailed sample at this link 您可以在此链接中找到详细的示例
http://help.arcgis.com/en/webapi/javascript/arcgis/help/jssamples_start.htm#jssamples/find_drilldown.html http://help.arcgis.com/en/webapi/javascript/arcgis/help/jssamples_start.htm#jssamples/find_drilldown.html
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