topic Re: Buffer a point graphic or feature service in web app builder in Web AppBuilder Custom Widgets Questions

Buffer a point graphic or feature service in web app builder

gkatsamb — Thu, 25 Mar 2021 17:11:12 GMT

web app builder 2.19 I just want a simple tool/widget that allows me to click a point on the map and create buffers at a distance I specify

Re: Buffer a point graphic or feature service in web app builder

BlytheSpendlove — Thu, 20 May 2021 23:36:17 GMT

The Analysis widget allows you to create buffers, so you might want to look into that. I use it to create a buffer around layers but I believe you can use it to create a buffer around a point as well. (Then you just have to enable the SpatialAnalysisTools gp service from your server manager if you are on ArcGIS Enterprise, not sure how it works in AGOL).

The main thing to watch out for with using that as a solution is that only Creator or Insight Analyst user types can use the SpatialAnalysisTools service that the buffer depends on. For an organization with lots of users, this can create a problem, since the Creator license is more expensive than the Field Editor or Viewer licenses.

Re: Buffer a point graphic or feature service in web app builder

BlytheSpendlove — Fri, 21 May 2021 00:01:28 GMT

@gkatsamb You might also want to look into the Incident Analysis Widget. That doesn't require the SpatialAnalysisTools service and might fit your needs.

Re: Buffer a point graphic or feature service in web app builder

LefterisKoumis — Fri, 21 May 2021 19:20:14 GMT

The screening tool does buffer as well and you can print a report about the features are within the buffer zone. No spatial analysis or other licenses are required.

Re: Buffer a point graphic or feature service in web app builder

gkatsamb — Mon, 24 May 2021 18:13:00 GMT

I want the user to click a point on the map as a (graphic) and buffer that point with ring buffers

Re: Buffer a point graphic or feature service in web app builder

LefterisKoumis — Mon, 24 May 2021 19:34:07 GMT

THat what the screening tool does. You select which graphic you want want to buffer around (in your case, point) then define the distance to buffer around.

Re: Buffer a point graphic or feature service in web app builder

gkatsamb — Mon, 24 May 2021 20:02:14 GMT

But Screening Tool requires a layer/feature service to be selected as an Analysis Layer. I just want to be able to click anywhere on map and create a buffer at a distance i select.

Re: Buffer a point graphic or feature service in web app builder

LefterisKoumis — Tue, 25 May 2021 15:29:56 GMT

I don't know how comfortable you are with JS but I changed the code on the screening widget to not require a layer to be selected before you create a map. Or you can create a custom widget to do that.

Here is some code that I used to create custom buffer.

mysymbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_NONE, new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASHDOT, new Color([255, 0, 0]), 2), new Color([255, 255, 0, 0.25])); geodesicBuffer.distances = [thebufferdistance]; geodesicBuffer.unit = bufferunit; geodesicBuffer.outSpatialReference = this.map.spatialReference; geodesicBuffer.geodesic = true; geodesicBuffer.unionResults = true; bufferGraphicsLayer = new GraphicsLayer(); esriConfig.defaults.geometryService.buffer(geodesicBuffer, lang.hitch(this, function (evt) { resultEvent = evt[0]; var geodesicUserGraphic = new Graphic(); geodesicUserGraphic.setAttributes({ "name": "Buffer" }); geodesicUserGraphic.geometry = resultEvent; geodesicUserGraphic.symbol = mysymbol; bufferGraphicsLayer.add(geodesicUserGraphic); this.map.addLayer(bufferGraphicsLayer);