Having some difficulty with a seemingly simple scope issue that I am struggling to understand. Someone will probably be able to quickly identify what I'm missing here!
I have a function that calculates planar area and calculates an acreage value with the geometry of a graphic as the input parameter. In that process I intended to set "this.acrevalue" and have it set and available later on in other functions of a button click event. However, it's always null BUT I can see that the correct acreage value is being calculated.
saveDataBtnClick() function is a button in the html of the widget that I hoped to somehow use the getAcreageValueFromPolygon() function to get the acreage value before submitting a applyEdit() on the feature service.
getAcreageValueFromPolygon: function (geom) {
projection.load().then(function (evt) {
const inSpatialReference = new SpatialReference({ wkid: 102100 });
const spSpatialReference = new SpatialReference({ wkid: 2881 });
const poly = new Polygon(geom, inSpatialReference);
var geoT = projection.getTransformation(inSpatialReference, spSpatialReference)
const projectedPoly = projection.project(poly, spSpatialReference);
var areasAndLengthParams = new AreasAndLengthsParameters();
areasAndLengthParams.areaUnit = esri.tasks.GeometryService.UNIT_ACRES;
areasAndLengthParams.lengthUnit = GeometryService.UNIT_FOOT;
areasAndLengthParams.polygons = projectedPoly;
var geometryService = new GeometryService("https://utility.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
geometryService.on("areas-and-lengths-complete", outputAreaAndLength);
geometryService.simplify([projectedPoly], function (simplifiedGeometries) {
areasAndLengthParams.polygons = simplifiedGeometries;
geometryService.areasAndLengths(areasAndLengthParams);
});
}.bind(this))
function outputAreaAndLength(evtObj) {
var result = evtObj.result;
this.acrevalue = result.areas[0].toFixed(3)
}
},
saveDataBtnClick: function () {
var e = document.getElementById("layerTypeSelections");
//use config to reference services and specific service layers
this.serverSideScratchLayer = new FeatureLayer(this.config.applicationFeatureLayer + "/" + lyrNum, { outFields: ["*"] });
var features = this.unionedGraphic2.geometry
if (features) {
this.getAcreageValueFromPolygon(this.unionedGraphic2.geometry); //set the acreagae value and have it available for saving in applyEdits
var spAcres = this.acrevalue;
attr["TRMT_ACRES"] = spAcres;
var fYear = '1901'
attr['FISCAL_YEAR'] = fYear
this.unionedGraphic2["attributes"] = this.attr
this.serverSideScratchLayer.applyEdits([this.unionedGraphic2], [], this.attr, lang.hitch(this, function (add) {
if (add.length > 0) {
if (add[0].objectId) {
console.log('Add successful with objectid: ' + add[0].objectId);
this.uploadOID = add[0].objectId
}
}
}).bind(this));
}
},
