topic Re: Arcade if/or/default statements in ArcGIS Online Questions

Arcade if/or/default statements

aroininen — Thu, 25 Feb 2021 14:24:50 GMT

Hello community,

I am having a problem adding a logical function into an arcade state I have scraped together from the web. I am not a programmer more of a edit existing code kind of person. I will try to keep this simple.

Here is the expression I have that intersects features and provides results for what its within - landuse info

var intersectLayer =Intersects(FeatureSetByName($map,"LandUse - h Provision Overlay"), Buffer($feature, -10, 'feet'))

var Hazard = "";

for (var f in intersectLayer) {
if (Hazard == "") {
Hazard = f.NAME
} else {
Hazard += " And " + f.NAME;}}

return Hazard

the result is this:

I don't know how to insert a logical function into this expression so empty values display "n/a"

I have tried: IIf , IsEmpty, DefaultValue all kinds I just don't know how to fit them in

any help would be greatly appreciated!!!

Thanks

Aaron

also, can someone explained what the word hazard is for? it was just with the code so I left it in!

thanks again

Re: Arcade if/or/default statements

JohannesLindner — Thu, 25 Feb 2021 15:57:27 GMT

"Hazard" is the name of the variable that stores your text. You can call it pretty much anything you want, though descriptive names are the most sensible.

// Get all features of the LandUse layer that are intersected by the selected feature. // You apply a negative buffer here, so you don't get land use features that only intersect with the outer edges, is that correct? var intersect_layer = Intersects(FeatureSetByName($map, "LandUse - h Provision Overlay"), Buffer($feature, -10, 'feet')) // Define and initialize the variable that stores your text var intersected_land_uses = "" // Loop through the intersecting land use features for (var f in intersect_layer ) { var land_use = IIF(IsEmpty(f.NAME), "n/a", f.NAME) if (intersected_land_uses == "") { // there is nothing in here yet intersected_land_uses = land_use } else { // there is something in here already, append with " And " intersected_land_uses += " And " + land_use } } return intersected_land_uses

Re: Arcade if/or/default statements

aroininen — Thu, 25 Feb 2021 17:33:38 GMT

wow! thanks!!!

I tried it but it won't display n/a.... am I missing something?

thanks again for your time - very much appreciated

intersect (pink is 'h overlay')

no intersect

Re: Arcade if/or/default statements

JohannesLindner — Tue, 02 Mar 2021 05:55:44 GMT

So where it says "Hazard", it should say "n/a", right? Or is "Hazard" a land use?

Can you post the code you used, please?

Re: Arcade if/or/default statements

aroininen — Tue, 02 Mar 2021 13:54:16 GMT

Hello!

No I want it to show n/a after 'h Overlay" as it is outside of zone

Thanks

Re: Arcade if/or/default statements

JohannesLindner — Tue, 02 Mar 2021 14:00:51 GMT

Ah, I think I misunderstood your original question...

Does this do what you want?

// Get all features of the LandUse layer that are intersected by the selected feature. // You apply a negative buffer here, so you don't get land use features that only intersect with the outer edges, is that correct? var intersect_layer = Intersects(FeatureSetByName($map, "LandUse - h Provision Overlay"), Buffer($feature, -10, 'feet')) // No intersecting features found -> "n/a" if(Count(intersect_layer) == 0) { return "n/a" } // Define and initialize the variable that stores your text var intersected_land_uses = "" // Loop through the intersecting land use features for (var f in intersect_layer ) { var land_use = IIF(IsEmpty(f.NAME), "n/a", f.NAME) if (intersected_land_uses == "") { // there is nothing in here yet intersected_land_uses = land_use } else { // there is something in here already, append with " And " intersected_land_uses += " And " + land_use } } return intersected_land_uses

Re: Arcade if/or/default statements

aroininen — Tue, 02 Mar 2021 14:57:00 GMT

thanks again for you help but I get this error

Execution Error:Invalid Parameters for Count....?

Re: Arcade if/or/default statements

aroininen — Tue, 02 Mar 2021 14:59:38 GMT

could I use "Touches' instead of "intersect...?

Re: Arcade if/or/default statements

JohannesLindner — Tue, 02 Mar 2021 15:43:04 GMT

Intersects and Touches both have pictures indicating what will be selected. Based on your screenshots above, your "h overlay" layer intersects your parcels, so you probably should use Intersects.

I don't know what's wrong with the code, it works for me. Maybe someone else can help? @DanPatterson , @JoeBorgione ?

Re: Arcade if/or/default statements

aroininen — Tue, 02 Mar 2021 16:16:57 GMT

Thanks!!! I will keep playing with my code!!

Cheers

Aaron

Re: Arcade if/or/default statements

aroininen — Tue, 02 Mar 2021 16:25:04 GMT

My bad - I had the $mapp \layer wrong!

nailed it!!

Thanks for all your help - I will click solved!!