topic Re: Dissolve javascript api 4.x in ArcGIS JavaScript Maps SDK Questions

Dissolve javascript api 4.x

jaykapalczynski — Mon, 20 Apr 2020 23:09:40 GMT

Can you do a dissolve on a Graphics Layer in ArcGIS JavaScript API 4.x.

I see reference to this in 3.x but not 4.x

In JavaScript 4.14 I am selecting a specific number of features from a Feature Layer and writing them to a Graphics Layer. I now want to dissolve them to a multi-part polygon so I can update a Feature Class Geometry.

Can I do this with the API or do I need to do this with a Python Published GP Tool

Re: Dissolve javascript api 4.x

RobertScheitlin__GISP — Tue, 21 Apr 2020 12:42:11 GMT

Jay,

The method you are looking for is union on the GeometryService class

https://developers.arcgis.com/javascript/latest/api-reference/esri-tasks-GeometryService.html#union

or the GeometryEngine (if you want to do this clientside)

https://developers.arcgis.com/javascript/latest/api-reference/esri-geometry-geometryEngine.html#union

Re: Dissolve javascript api 4.x

jaykapalczynski — Tue, 21 Apr 2020 13:06:57 GMT

Does this create one feature, in ArcMap is does not.....

Are there any examples?

I have a Graphics layer with a few graphics in it

I want to union this and write a single feature to another graphics layer.

var union = geometryEngine.union( graphicsLayer1);

graphicsLayer2.addMany(union);

Re: Dissolve javascript api 4.x

RobertScheitlin__GISP — Sat, 11 Dec 2021 13:34:14 GMT

Jay,

In ArcGIS Server Union is similar to dissolve.

An example code follows:

var Geoms = graphicsLayer1.graphics.map(function(gra){
  return gra.geometry;
});‍‍‍
var union = geometryEngine.union(Geoms);
graphicsLayer2.add(union);‍‍‍‍‍