topic Re: Super basic question in ArcGIS JavaScript Maps SDK Questions

Super basic question

KevinHanley2 — Wed, 03 May 2023 20:21:26 GMT

So I am both new to Javascript and new to this ArcGIS API. I know I'm just missing some sort of basic knowledge so I figured I'd turn to the experts.

I have just came back from not doing any coding for about a year, so things are definitely not fresh. I'm attempting to use the GeometryEngine with the 4.26 API to buffer a radius from a given feature/set of features.

Currently it's saying that the geometry is null (line 9 in the code below), so it isn't seeing any of the features data inside this function. I am sure I had this working at one point. Can anyone tell me how to get the features data accessible from inside this function? (If you need more information about the rest of my code just let me know).

Thanks for taking a look!

Re: Super basic question

BlakeTerhune — Wed, 03 May 2023 20:51:30 GMT

How is features being created? Maybe log features to the console before you call it in your function so you can inspect its contents and ensure there's a geometry property and you're accessing it correctly.

Re: Super basic question

KenBuja — Thu, 04 May 2023 13:15:54 GMT

Line 9 should be

parcel.push(features[i].geometry);

Re: Super basic question

KevinHanley2 — Thu, 04 May 2023 20:31:17 GMT

Unfortunately this isn't the case, since features is null.

Re: Super basic question

KevinHanley2 — Thu, 04 May 2023 20:33:12 GMT

This is the basic bit of knowledge that I can't figure out. I am clicking on my map and it is highlighting the feature and adding the feature's information to the featureTable, so I know the graphic exists somewhere. I just can't figure out what variable contains the geometry of the highlighted graphic.

Re: Super basic question

KenBuja — Thu, 04 May 2023 20:39:55 GMT

If features is null, how is it even going through the loop in lines 8-10?

Re: Super basic question

KevinHanley2 — Thu, 04 May 2023 20:46:51 GMT

My guess is that since the length is 0, it runs through it once, pushing a null value to parcel.

Re: Super basic question

KenBuja — Fri, 05 May 2023 14:14:19 GMT

It won't go through the loop once, though. In JSBin, this is what happens with your loop when features is not empty

And this is when features is empty