Subqueries using Features/Polygons in ArcGIS JS

NickRobles2 — Mon, 13 Feb 2017 05:08:15 GMT

Essentially, I'm trying to perform a second spatial query on a set of returned results from a previous query. The source runs, but it doesn't return any results for floodCalcs.business in the second for-loop. I do not get any errors from this and I do check to make sure that polygons have been loaded into polygons.

Just realized I don;t know how to insert formatted code in here. Help?

queryShapes = function () {
for (var v = 0; v < shapes.length; v++) {

query = new Query();
select = shapes;
query.geometry = shapes.getExtent();
query.returnGeometry = true;

businessLayer.queryFeatures(query, selectBusiness);
//featureLayer.queryFeatures(query, selectInBuffer);

//perform query on business layer using user drawn shape's bounding box (extent)
function selectBusiness(response) {
var feature;
var features = response.features;
var floodFeatures = [];
var floodFeature;
var inBuffer = [];
var floodBuffer = [];

var subQuery = new Query();
subQuery.objectIds = inBuffer;
//use a fast objectIds selection query (should not need to go to the server)
featureLayer.selectFeatures(subQuery, FeatureLayer.SELECTION_NEW, function (results) {
floodCalcs.business += sumPopulation(results);
});

}
function sumPopulation(features) {
var popTotal = 0;
popTotal = features.length;
return popTotal;
}

}

}

Re: Subqueries using Features/Polygons in ArcGIS JS

AndrewFarrar — Mon, 13 Feb 2017 16:04:42 GMT

Do you get the expected results from your first query? Thats where I would start.

I put up a fiddle of how I do nested queries here: JS_Search - JSFiddle

(note that the services don't work, since JSFiddle requires https://, but I promise the app works normally.)

The fiddle searches for attributes using a findTask, then grabs the geometry from the results and uses that to perform a spatial search for polygon attributes. not exactly what you are trying to do, but similar.

Re: Subqueries using Features/Polygons in ArcGIS JS

NickRobles2 — Mon, 13 Feb 2017 19:39:50 GMT

I actually figured it out. I simply did a simple logical statement:

if (select.contains(feature.geometry) && polygon.contains(feature.geometry)) {
floodCalcs.businessF += 1;
}

My only issue now is totally different. Is there a way to convert a feature layer (of polygons) to an array of polygons?

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Subqueries using Features/Polygons in ArcGIS JS

Re: Subqueries using Features/Polygons in ArcGIS JS

Re: Subqueries using Features/Polygons in ArcGIS JS