I am attempting to query some FeatureLayers, but I cannot seem to construct a query that works.
If you click on the map in the following demo the promise returns an error: ArcGIS: queryFeatures - Unsupported query error
- message: "Unsupported query"
- name: "esri.layers.graphics.QueryEngine"
I've tried a number of searches with different geometry types (extent, circle, geodesic buffer). I've also tried center and distance, but they are all unsupported.
Question: how can I find out what kinds of queries FeatureLayers support? I have not come across docs that have helped in that regard. Besides my sample FeatureLayer there are other FeatureLayers I will be querying (e.g. remote ones) and I would like to figure out what I can and cannot send in a query.
FYI, here is the code:
require([
"esri/Map",
"esri/views/MapView",
"esri/layers/FeatureLayer",
"esri/geometry/geometryEngine",
"esri/Graphic",
"esri/layers/GraphicsLayer",
"esri/tasks/support/Query",
"esri/widgets/CoordinateConversion",
"esri/geometry/support/webMercatorUtils",
"esri/geometry/Point",
"dojo/domReady!"
], function(Map, MapView, FeatureLayer, geometryEngine, Graphic, GraphicsLayer, Query, CC, wMU, Point) {
map = new Map({
basemap: "topo-vector"
});
view = new MapView({
container: "viewDiv",
map: map,
center: [-118.739851, 34.090456],
zoom: 14
});
view.ui.add(new CC({ view: view }), 'bottom-right');
featureLayer = new FeatureLayer({
id: 'dots',
title: 'dots on a map',
geometryType: 'point',
objectIdField: 'id',
spatialReference: { wkid: 4326 },
source: [],
fields: [
{
name: 'id',
alias: 'ID',
type: 'oid',
},
{
name: 'mapObject',
alias: 'mapObject',
type: 'object'
}
]
});
map.layers.add(featureLayer);
var circleGraphic;
points = [];
[
'-118.742555, 34.095076',
'-118.747447, 34.094010',
'-118.749593, 34.090811',
'-118.734658, 34.088039',
'-118.736032, 34.091735',
'-118.743070, 34.091096'
].forEach(pair => {
var ll = pair.split(', ');
addPoint(new Point({
type: 'point',
spatialReference: { wkid: 4326 },
x: ll[0],
y: ll[1]
}));
});
view.on('click', function (e) {
var centerPt = e.mapPoint;
if (e.native.ctrlKey) {
addPoint(centerPt);
} else {
var geom = geometryEngine.geodesicBuffer(centerPt, 400, 'meters');
if (circleGraphic) view.graphics.remove(circleGraphic);
circleGraphic = new Graphic({
geometry: geom,
symbol: {
type: 'simple-fill',
color: [140, 140, 222, 0.5]
}
});
view.graphics.add(circleGraphic);
query = featureLayer.createQuery();
query.geometry = geom;
query.spatialRelationship = 'contains';
featureLayer.queryFeatures(query)
.then(result => {
console.log('This area contains', inPts.length, 'points');
}).catch(error => {
console.error(error);
});
}
});
function addPoint(geo) {
if (geo.spatialReference.isGeographic) {
geo = wMU.geographicToWebMercator(geo);
console.log('converting geography');
}
var pt = new Graphic({
geometry: geo,
symbol: {
type: 'simple-marker',
style: 'circle',
color: 'black',
size: '8px'
}
});
view.graphics.add(pt);
points.push(pt);
}
});
