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Feature layer selection sum up numeric values in field

Anonymous User

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

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Accepted answers

kenbuja

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

<SPAN class="keyword token">var</SPAN> sum <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
array<SPAN class="punctuation token">.</SPAN><SPAN class="token function">forEach</SPAN><SPAN class="punctuation token">(</SPAN>features<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN> <SPAN class="punctuation token">(</SPAN>feature<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; sum <SPAN class="operator token">+</SPAN><SPAN class="operator token">=</SPAN> feature<SPAN class="punctuation token">.</SPAN>attributes<SPAN class="punctuation token">.</SPAN>yourField<SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

All comments

Anonymous User

array<SPAN class="" style="color: #999999; border: 0px; font-weight: inherit;">.</SPAN><SPAN class="" style="color: #d74444; border: 0px; font-weight: inherit;">forEach</SPAN>

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

Anonymous User

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

kenbuja

Why not just use targetGeometry in your array

featureLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">selectFeatures</SPAN><SPAN class="punctuation token">(</SPAN>selectQuery<SPAN class="punctuation token">,</SPAN> FeatureLayer<SPAN class="punctuation token">.</SPAN>SELECTION_NEW<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN> <SPAN class="punctuation token">(</SPAN>targetGeometry<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> sum <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; $<SPAN class="punctuation token">.</SPAN><SPAN class="token function">each</SPAN><SPAN class="punctuation token">(</SPAN>targetGeometry<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN> <SPAN class="punctuation token">(</SPAN>feature<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sum <SPAN class="operator token">+</SPAN><SPAN class="operator token">=</SPAN> feature<SPAN class="punctuation token">.</SPAN>attributes<SPAN class="punctuation token">.</SPAN>Sum_TREECO<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Anonymous User

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);

kenbuja

<SPAN class="keyword token">var</SPAN> sum <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
array<SPAN class="punctuation token">.</SPAN><SPAN class="token function">forEach</SPAN><SPAN class="punctuation token">(</SPAN>features<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN> <SPAN class="punctuation token">(</SPAN>feature<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; sum <SPAN class="operator token">+</SPAN><SPAN class="operator token">=</SPAN> feature<SPAN class="punctuation token">.</SPAN>attributes<SPAN class="punctuation token">.</SPAN>yourField<SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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