How to nest dojo async calls and wait until all are complete

ShawnHolyoak

I'm trying to query address points from two FeatureLayer objects for one or more parcel polygons. The user will select the parcel polygons on the map, and behind the scenes, the address points will be selected. Once all the address points are selected, then I need to make an API call. I've written some code, shown below, and I'm close, but my outer "all" promise is not calling the API as expected. How do I do nested async calls like this, and have all complete before calling my API? Thanks!

define(["dojo/_base/declare", "dojo/promise/all", "dojo/_base/lang", "dojo/_base/array", "esri/tasks/query"],
function (declare, all, lang, array, Query) {
    var sdcAddressSelector = declare(null, {
        constructor: function () {
            this.addresses = [];
        },
        addAddressesToList: function(response) {
            response = array.filter(response, function (r) {//filter out any failed tasks
                return r.length > 0;
            });

            array.forEach(response, function (r) {
                this.addresses.push(r);
            });
        },
        callAPI: function () {
            //api calls here
        },
        executeSelect: function (selectedParcels) {
            var _this = this;
            var selectList = array.map(selectedParcels, function (parcel, index) {
                qry = new Query();
                qry.geometry = parcel.feature.geometry;


                //async loop over the address layers to get the  addresses that intersect the current parcel
                var addressList = array.map(esriMap.addressServices, function (layer, index) {
                    layer.queryFeatures(qry, lang.hitch(_this, _this.addAddressesToList));
                });
                return all(addressList);
            });


            return all(selectList, lang.hitch(this, this.callAPI));
        },
    });
    return sdcAddressSelector;
});

RobertScheitlin__GISP

Shawn,

  This is what I have working in a sample I threw together:

(I pass the maps SpatialReference in using the spatRef property of the sdcAddressSelector).

define(["dojo/_base/declare", "dojo/promise/all", "dojo/_base/lang", "dojo/_base/array", "esri/tasks/query"],
  function (declare, all, lang, array, Query) {
    var sdcAddressSelector = declare(null, {
      spatRef: null,
      addresses: null,

      constructor: function () {
        this.addresses = [];
      },

      addAddressesToList: function (response) {
        response = array.filter(response, function (r) { //filter out any failed tasks
          return r.features.length > 0;
        });

        array.forEach(response, lang.hitch(this, function (r) {
          this.addresses.push(r);
        }));
        this.callAPI();
      },

      callAPI: function () {
        //api calls here
        console.info(this.addresses);
      },

      createQueryParams: function (layers, geom) {
        var queryParamsList = [];
        array.forEach(layers, lang.hitch(this, function () {
          var queryParams = new Query();
          queryParams.geometry = geom;
          queryParams.outFields = ['*'];
          queryParams.returnGeometry = false;
          queryParams.outSpatialReference = this.spatRef;
          queryParamsList.push(queryParams);
        }));
        return queryParamsList;
      },

      executeSelect: function (selectedParcels, esriMap) {
        var promises = [];
        array.map(selectedParcels, lang.hitch(this, function (parcel) {
          var params = this.createQueryParams(esriMap.addressServices, parcel.geometry);
          array.map(esriMap.addressServices, lang.hitch(this, function (layer, index) {
            promises.push(layer.queryFeatures(params[index]));
          }));
        }));

        var qPromises = new all(promises);
        qPromises.then(lang.hitch(this, function (r) {
          lang.hitch(this, this.addAddressesToList(r));
        }), lang.hitch(this, function (err){
          console.info(err);
        }));
      }
    });
    return sdcAddressSelector;
  });