topic Re: How to assign value to field using Arcade calculated value in ArcGIS Field Maps Questions

How to assign value to field using Arcade calculated value

OliverIshmael — Mon, 17 Apr 2023 00:46:34 GMT

I wish to pre-populate the a field (Survey_Type) in my form with a Domain value "Asset" and have been attempting to do this using an Arcade expression. The expression returns false, and the value isn't added:

$feature.Survey_Type == "Asset"

What am i doing wrong?

Re: How to assign value to field using Arcade calculated value

JeffSilberberg — Mon, 17 Apr 2023 02:05:19 GMT

Two equal signs is a comparison -- One equal is an assignment

If you want to assign the vale then I think you want -- $feature.Survey_Type = "Asset"

Re: How to assign value to field using Arcade calculated value

OliverIshmael — Mon, 17 Apr 2023 09:59:17 GMT

Unfortunately, I already tried that. In red text Field Maps form says:

'Failed to calculate'

[ARCADE] - Expression failed to evaluate: \nName: expr/survey-type--asset\nError:java.util.concurrent.ExecutionException:com.esriarcgisruntime.ArcGISRuntimeException:Arcade expression is invalid.: Arcade evaluation error. Evaluation_error_code::cannot_assign_to_const_value Line:1

Re: How to assign value to field using Arcade calculated value

JustinReynolds — Mon, 17 Apr 2023 13:48:20 GMT

You can not assign a value to a field in this way. $feature.[any field name] is a constant during the execution of any expression. All you need to do is return the string "Asset".

In designer, select the field Survey_Type. Then add a field calculation.

return "Asset"

Here is some helpful documentation.
https://developers.arcgis.com/arcade/guide/variables/

https://developers.arcgis.com/arcade/guide/return/

Re: How to assign value to field using Arcade calculated value

RhettZufelt — Mon, 17 Apr 2023 17:41:58 GMT

You might need to return the Domain Code and not the value.

You could also just set "Asset" as the default value in the template.

Re: How to assign value to field using Arcade calculated value

OliverIshmael — Thu, 18 May 2023 00:44:08 GMT

@JustinReynolds @RhettZufelt I tried both of your suggestions (using calculated values, or, using default value) but neither of them result in a value being added to the field. The form completes successfully, but when i view the feature layer data no value has been saved for that field.

Do you know why this might be?

Re: How to assign value to field using Arcade calculated value

JustinReynolds — Thu, 18 May 2023 01:26:19 GMT

Can you provide more details, I'd prefer not guess.

Please post your expressions in a JavaScript code block or screenshot it. Screenshot the Form as it is being completed, the popup afterword and the feature layer data you say is not being populated.

A screenshot of the field with its domain values would also be helpful.

Also, when you create the expression does it work when you test it in Field Maps Designer?

Re: How to assign value to field using Arcade calculated value

OliverIshmael — Thu, 18 May 2023 10:01:05 GMT

Thank you for offering to help. Bizarrely it wasn't working yesterday but it is now. So that's good...i think?!