topic Re: Selecting polygons intersecting with another polygon in ArcGIS JavaScript Maps SDK Questions

Selecting polygons intersecting with another polygon

SamirGambhir — Sun, 23 Jan 2011 17:56:32 GMT

Hi,
I have been trying to make this code work for sometime which should have taken me less time than I have spent on it so far. My code looks up a zip code file, selects a zipcode based on user selection. Once selected, it highlights the selected zipcode (mycode works till this point very well) and runs a query on another file to select all census tracts that intersect with the selected zipcode boundary. My code stops short of selecting tracts based on zipcode selection. Any help to resolve this will be great! Here is my code:

function QueryByZip(Zip_ID){
map.graphic.clear();
     dijit.byId('progress').show();
queryTask= new esri.tasks.QueryTask("http://128.146.162.230/arcgis/rest/services/KC_zipcodes/MapServer/2");
query = new esri.tasks.Query();
query.where = "ZIP = '" + Zip_ID + "'";
query.returnGeometry = true;
query.outFields = ["ZIP"];
queryTask.execute(query);
dojo.connect(queryTask, "onComplete", zoomToZip);
}

function zoomToZip(featureSet){
var features = featureSet.features;
var zipGraphic;
for (var i=0, il=features.length; i<il; i++) {
     zipGraphic = new esri.Graphic(features);
          map.graphics.add(zipGraphic.setSymbol(zipSymbol));
    }
queryTask2= new esri.tasks.QueryTask("http://128.146.162.230/arcgis/rest/services/KingCountyAllOverlaysForQueryNew/MapServer/0");
query2 = new esri.tasks.Query();
query2.geometry = zipGraphic.geometry;
query2.spatialRelationship = esri.tasks.Query.SPATIAL_REL_INTERSECTS;
query2.returnGeometry = true;
queryTask2.execute(query2);
dojo.connect(queryTask2, "onComplete", selectTracts);
}

function selectTracts(featureSet) {
var featureTracts = featureSet.features;
var tractGraphic;
       for (var i=0, il=featureTracts.length; i<il; i++) {
     tractGraphic = new esri.Graphic(featureTracts);
        map.graphics.add(tractGraphic.setSymbol(highlightSymbol));
    }
    map.setExtent(tractGraphic.geometry.getExtent());
}

Re: Selecting polygons intersecting with another polygon

nicogis — Sun, 12 Dec 2021 01:17:25 GMT

var loading = dojo.byId("progress");

function QueryByZip(Zip_ID){

map.graphic.clear();
esri.show(loading);
var queryTask= new esri.tasks.QueryTask("http://128.146.162.230/arcgis/rest/services/KC_zipcodes/MapServer/2");
dojo.connect(queryTask, "onComplete", zoomToZip);
var query = new esri.tasks.Query();
query.where = esri.substitute({zip: Zip_ID},"ZIP = '${zip}'");
query.returnGeometry = true;
query.outFields = ["ZIP"];
queryTask.execute(query);

}

function zoomToZip(featureSet){
var features = featureSet.features; 
map.graphics.add(features[0].setSymbol(zipSymbol));

var queryTask2= new esri.tasks.QueryTask("http://128.146.162.230/arcgis/rest/services/KingCountyAllOverlaysForQueryNew/MapServer/0");
dojo.connect(queryTask2, "onComplete", selectTracts);
var query2 = new esri.tasks.Query();
query2.geometry = zipGraphic.geometry;
query2.spatialRelationship = esri.tasks.Query.SPATIAL_REL_INTERSECTS;
query2.returnGeometry = true;
queryTask2.execute(query2);
}

function selectTracts(featureSet) {
   var featureTracts = featureSet.features; 
   map.graphics.add(featureTracts[0].setSymbol(highlightS ymbol));
   
   //if point
   if (featureTracts[0].geometry.type === 'point')   
       var factor = 1000;
       extent = new esri.geometry.Extent(pt.x - factor, pt.y - factor, pt.x + factor, pt.y + factor,   pt.SpatialReference);
    }
    else
        extent = featureTracts[0].geometry.getExtent();

   map.setExtent(extent);
} .

remember that all task return dojo.Deferred so you can add a callback for run a task after first task and so you have more control for abort erroback ect.

Re: Selecting polygons intersecting with another polygon

SamirGambhir — Tue, 25 Jan 2011 15:03:45 GMT

Thanks Domenico for looking at my code and for your help. I am looking up dojo campus to see how to use dojo.Deferred in this case.
I revised my code based on your suggestion but, unfortunately, it did not help solve the issue.
Thanks
Samir

Re: Selecting polygons intersecting with another polygon

HemingZhu — Wed, 26 Jan 2011 16:23:12 GMT

Hi,
I have been trying to make this code work for sometime which should have taken me less time than I have spent on it so far. My code looks up a zip code file, selects a zipcode based on user selection. Once selected, it highlights the selected zipcode (mycode works till this point very well) and runs a query on another file to select all census tracts that intersect with the selected zipcode boundary. My code stops short of selecting tracts based on zipcode selection. Any help to resolve this will be great! Here is my code:

function QueryByZip(Zip_ID){
map.graphic.clear();
     dijit.byId('progress').show();
queryTask= new esri.tasks.QueryTask("http://128.146.162.230/arcgis/rest/services/KC_zipcodes/MapServer/2");
query = new esri.tasks.Query();
query.where = "ZIP = '" + Zip_ID + "'";
query.returnGeometry = true;
query.outFields = ["ZIP"];
queryTask.execute(query);
dojo.connect(queryTask, "onComplete", zoomToZip);
}

function zoomToZip(featureSet){
var features = featureSet.features;
var zipGraphic;
for (var i=0, il=features.length; i<il; i++) {
     zipGraphic = new esri.Graphic(features);
          map.graphics.add(zipGraphic.setSymbol(zipSymbol));
    }
queryTask2= new esri.tasks.QueryTask("http://128.146.162.230/arcgis/rest/services/KingCountyAllOverlaysForQueryNew/MapServer/0");
query2 = new esri.tasks.Query();
query2.geometry = zipGraphic.geometry;
query2.spatialRelationship = esri.tasks.Query.SPATIAL_REL_INTERSECTS;
query2.returnGeometry = true;
queryTask2.execute(query2);
dojo.connect(queryTask2, "onComplete", selectTracts);
}

function selectTracts(featureSet) {
var featureTracts = featureSet.features;
var tractGraphic;
       for (var i=0, il=featureTracts.length; i<il; i++) {
     tractGraphic = new esri.Graphic(featureTracts);
        map.graphics.add(tractGraphic.setSymbol(highlightSymbol));
    }
    map.setExtent(tractGraphic.geometry.getExtent());
}

change these two lines of code:
tractGraphic = new esri.Graphic(featureTracts); ---Wrong here
map.graphics.add(tractGraphic.setSymbol(highlightS ymbol));
to:
tractGraphic =new esri.Graphic();
map.graphics.add(tractGraphic.setGeometry(featureTracts.geometry).setSymbol(highlightSymbol));

Re: Selecting polygons intersecting with another polygon

SamirGambhir — Fri, 28 Jan 2011 20:33:17 GMT

Thanks Heming for looking into..........but still no luck. I have tried adding controls at each step of the code and realized the problem is with the second query that is supposed to select tracts based on zip code selection. Any suggestions?
Thanks
Samir

Re: Selecting polygons intersecting with another polygon

JigneshKanani — Fri, 17 Jun 2011 14:15:50 GMT

It looks like you are executing the queryTask2 before listening for callback.

Try changing the order of lines:
queryTask2.execute(query2);
dojo.connect(queryTask2, "onComplete", selectTracts);

to:
dojo.connect(queryTask2, "onComplete", selectTracts);
queryTask2.execute(query2);

Thanks,
Jignesh

Re: Selecting polygons intersecting with another polygon

HemingZhu — Fri, 17 Jun 2011 14:35:30 GMT

It looks like you are executing the queryTask2 before listening for callback.

Try changing the order of lines:
queryTask2.execute(query2);
dojo.connect(queryTask2, "onComplete", selectTracts);

to:
dojo.connect(queryTask2, "onComplete", selectTracts);
queryTask2.execute(query2);

Thanks,
Jignesh

Also you don't need to connect an event every time in you method. set queryTask and queryTask2 as globel variable and define handlers one time in your init() function Like the following:

var queryTask, queryTask2;
function init()
{
...
queryTask= new esri.tasks.QueryTask("http://128.146.162.230/arcgis/rest/services/KC_zipcodes/MapServer/2");
dojo.connect(queryTask, "onComplete", zoomToZip);
.....
queryTask2= new esri.tasks.QueryTask("http://128.146.162.230/arcgis/rest/services/KingCountyAllOverlaysForQueryNew/MapServer/0");
dojo.connect(queryTask2, "onComplete", selectTracts);
.....
}
.....
function QueryByZip(Zip_ID){
map.graphic.clear();
dijit.byId('progress').show();

query = new esri.tasks.Query();
query.where = "ZIP = '" + Zip_ID + "'";
query.returnGeometry = true;
query.outFields = ["ZIP"];
queryTask.execute(query);

}

function zoomToZip(featureSet){
var features = featureSet.features;
var zipGraphic;
for (var i=0, il=features.length; i<il; i++) {
zipGraphic = new esri.Graphic(features);
map.graphics.add(zipGraphic.setSymbol(zipSymbol));
}
query2 = new esri.tasks.Query();
query2.geometry = zipGraphic.geometry;
query2.spatialRelationship = esri.tasks.Query.SPATIAL_REL_INTERSECTS;
query2.returnGeometry = true;
queryTask2.execute(query2);
}

function selectTracts(featureSet) {
var featureTracts = featureSet.features;
var tractGraphic;
for (var i=0, il=featureTracts.length; i<il; i++) {
tractGraphic = new esri.Graphic(featureTracts);
map.graphics.add(tractGraphic.setSymbol(highlightSymbol));
}
map.setExtent(tractGraphic.geometry.getExtent());
}