how to Feature layer query with custom exent? i can't find the featurelayer api about query with extent?
You can pass any geometry in the FeatureLayer query (FeatureLayer | API Reference | ArcGIS API for JavaScript 3.17 ).
var query = new Query(); query.outFields = [ "*" ]; query.geometry = myCostumExtentPolygonGeometry; featureLayer.queryFeatures(query, function(featureSet) { // process results });