How to prevent selection of Polygon which is already selected (Spatial Query) in ArcGIS JS 3.xyz

Question

Hi, Below is the code which is for spatial query. var map; var resultFromquery = []; require(["esri/map", "esri/layers/ArcGISDynamicMapServiceLayer", "esri/layers/ImageParameters","esri/geometry/Extent","esri/InfoTemplate","esri/SpatialReference","esri/tasks/query","esri/tasks/QueryTask","esri/graphic","esri/tasks/FeatureSet","esri/symbols/Symbol", "dojo/domReady!"], function(Map,ArcGISDynamicMapServiceLayer,ImageParameters,Extent,InfoTemplate,SpatialReference,query,QueryTask,graphic,FeatureSet,Symbol) { map = new Map("map", { basemap: "topo", center: [75.831,18.895], // longitude, latitude zoom: 10, //maxScale:8800 }); map.on("click", mapReady); var dynamicMapServiceLayer = new ArcGISDynamicMapServiceLayer("Mapservice"); dynamicMapServiceLayer.setVisibleLayers([0]); map.addLayer(dynamicMapServiceLayer); infoTemplate = new esri.InfoTemplate("${BLDGNO}", "Locality: ${SUBLOCALITY}
StateName: ${STATENAME}
Pincode: ${PINCODE}"); symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255,0,0]), 2), new dojo.Color([255,255,0,0.5])); }); function mapReady(evt) { queryTask = new esri.tasks.QueryTask("Mapservice"); query = new esri.tasks.Query(); query.returnGeometry = true; query.outFields = ["BLDGNO", "SUBLOCALITY", "STATENAME","CITYNAME","PINCODE"]; query.geometry = evt.mapPoint; queryTask.execute(query, showResults); } function showResults(featureSet) { dojo.forEach(featureSet.features,function(feature) { var graphic = feature; resultFromquery.push(feature.attributes); graphic.setSymbol(symbol); graphic.setInfoTemplate(infoTemplate); map.graphics.add(graphic); }); } document.getElementById('SubmitBtn').onclick = function myFunction() { try { var i; var BLDGNO =""; var PINCODE=""; for (i=0;i<resultFromquery.length;i++) { BLDGNO = resultFromquery[i].BLDGNO; PINCODE = resultFromquery[i].PINCODE; console.log(BLDGNO , PINCODE); } } catch (err) { alert(err.message); } }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ I wanted to know how to prevent (to show a alert or message) selecting the polygon which is already selected. Thanks, AS

RobertScheitlin__GISP · Accepted Answer

AS,

You would have to get an array of ObjectIds that are already selected and

* Add them as a definition expression to your Query (i.e. "NOT IN(2 ,45, 87)"). This would prevent them from being re-selected.
* Or loop through your query results and alert if an ObjectId matches your array of pre-existing selected ObjectIds