topic Re: labelExpression With NULL Fields in ArcGIS JavaScript Maps SDK Questions

labelExpression With NULL Fields

RodrigoFelga — Wed, 10 Jul 2019 14:22:32 GMT

I'm labeling a layer dinamicaly with 2 fields selcted by user. I create a labelExpression like that:

[FIELD1] CONCAT [FIELD2]

When the user selects 2 required fields the labeling works great. When the user selects 1 required field and 1 not required field the label don't show for all features. I think because FIELD2 in the second case has null values.

Any help will be apreciated.

Re: labelExpression With NULL Fields

Noah-Sager — Tue, 20 Aug 2019 20:56:29 GMT

You could try the DefaultValue Arcade expression:

Logical Functions | ArcGIS for Developers

Which we use in this sample for features that are missing data:

ArcGIS API for JavaScript Sandbox

Re: labelExpression With NULL Fields

IgorDolbik-Vorobey1 — Mon, 27 Jan 2020 07:19:44 GMT

This only works with FeatureLayer. How to make this work with MapImageLayer?

Thanks

Re: labelExpression With NULL Fields

Noah-Sager — Wed, 29 Jan 2020 23:54:00 GMT

This would require some SQL logic, possibly using a combination of the labelExpression and the where properties. I just tried but couldn't get it working yet. Will continue to investigate.