topic Re: Feature layer selection sum up numeric values in field in ArcGIS JavaScript Maps SDK Questions

Feature layer selection sum up numeric values in field

Anonymous User — Thu, 17 Nov 2016 21:36:11 GMT

Hi all,

I am using a feature layer in my web up and when I make a selection, I would like to sum up the numeric values stored in one field for the selected values. Is that possible?

Thanks,

Alex

Re: Feature layer selection sum up numeric values in field

KenBuja — Sat, 11 Dec 2021 20:57:08 GMT

If I understand your question correctly, when you make a selection from your feature layer, you will have an array of features. You can cycle through this array to get the value from each feature and add it to the sum

var sum = 0;
array.forEach(features, function (feature) {
    sum += feature.attributes.yourField;
}‍‍‍‍

Re: Feature layer selection sum up numeric values in field

Anonymous User — Thu, 17 Nov 2016 22:06:20 GMT

Thanks ken. That is just what I need. It seems however like the new selection did not pertain the attributes. Any idea how to pass the attributes along?

function initSelectToolbar(event) {
console.log("start edits");
selectionToolbar = new Draw(event.map);
var selectQuery = new Query();
selectQuery.outFields = ["*"];
var targetGeometry;
on(selectionToolbar, "DrawEnd", function (geometry) {
var geometryService = new GeometryService("http://itas46:6080/arcgis/rest/services/Utilities/Geometry/GeometryServer");
selectQuery.geometry = geometry;
featureLayer.selectFeatures(selectQuery, FeatureLayer.SELECTION_NEW, function (targetGeometry) {
var sum = 0;
var selectedfeatures = featureLayer.getSelectedFeatures();
$.each(selectedfeatures, function (feature) {
sum += feature.attributes.Sum_TREECO;
});
console.log(sum);

Re: Feature layer selection sum up numeric values in field

KenBuja — Sat, 11 Dec 2021 20:57:11 GMT

Why not just use targetGeometry in your array

featureLayer.selectFeatures(selectQuery, FeatureLayer.SELECTION_NEW, function (targetGeometry) {
    var sum = 0;
    $.each(targetGeometry, function (feature) {
        sum += feature.attributes.Sum_TREECO;
    });
});‍‍‍‍‍‍

Re: Feature layer selection sum up numeric values in field

Anonymous User — Thu, 17 Nov 2016 22:34:45 GMT

I tried. I still get this error. I am not sure if featureLayer.selectFeatures keeps all the attributes or discards them.

Re: Feature layer selection sum up numeric values in field

Anonymous User — Thu, 17 Nov 2016 23:29:01 GMT

array.forEach

it seems like it is not taking the JQuery part. array.foreach or arrayUtil.forEach was the way to go. Thanks Ken!