The ideal solution would be if the query.geometry property took an array as input. However the documentation seems to indicate that it is only a single geometry.
You could look into promises - check out the last example on this page: dojo/promise/all — The Dojo Toolkit - Reference Guide
The trick would be creating the Object that you provide as a parameter dynamically using your multiple polygons. Possibly something like this untested code:
// 1. make sure to add required modules ("dojo/promise/all", "dojo/Deferred", etc )
// 2. dynamically build object for dojo/promise/all parameter
queries = {};
for (var ai = 0; ai < multiplePolygons.length; ai++) {
var qryName = "qry" + ai;
queries[qryName] = queryPolygon(multiplePolygons[ai].areaGeometry);
}
// 3. return a deferred object from each query
function queryPolygon(geom) {
var deferred = new Deferred();
var query = new Query();
var queryTask = new QueryTask(pointUrl);
query.geometry = geom;
query.returnGeometry = true;
query.outFields = ["*"];
queryTask.execute(query, function (results) {
deferred.resolve(results);
});
return deferred.promise;
};
// 4. use all to process each polygon then respond to final results
all({queries}).then(function(results){
// process your final results here
console.log("All Results: ", results);
});
Please note that I haven't used promises/deferred in dojo, but I have had great success in AngularJS using them.
Owen
Spatial XP
