topic Re: Arcade expression to decode values in ArcGIS Online Developers Questions

Arcade expression to decode values

AndrewL — Tue, 17 Jul 2018 15:45:30 GMT

I am trying to use an Arcade expression to display coded values in a popup in ArcGIS Online, but it is not working. I am using the code from the decode example. It does not display in the popup. No error message is given in the popup.

var code = $feature.dn;
var decodedValue = Decode(code, 2, 'Non-Severe', 3, 'Marginal', 4, 'Slight', 'Other');

I am not the author of the map service. The dn field is an esriFieldTypeDouble. Thank you.

Re: Arcade expression to decode values

KenBuja — Tue, 17 Jul 2018 16:01:34 GMT

What are the values that are possible for dn? Can you share that service or provide a list of some of the values?

Re: Arcade expression to decode values

AndrewL — Tue, 17 Jul 2018 16:05:42 GMT

Sure it is a public service from NWS: Layer: Day 1 Convective Outlook (ID: 1)

Possible values are 2, 3, 4, 5, 6, and 7.

Re: Arcade expression to decode values

KenBuja — Sat, 11 Dec 2021 15:36:49 GMT

You needed to state what value to return. See the documentation about this.

var code = $feature.dn;
var decodedValue = Decode(code, 2, 'Non-Severe', 3, 'Marginal', 4, 'Slight', 'Other');
decodedValue;‍‍‍‍‍‍‍‍‍‍‍‍‍‍  //return decodedValue; also works‍‍‍‍‍‍

or it could be a single line expression.

Decode($feature.dn, 2, 'Non-Severe', 3, 'Marginal', 4, 'Slight', 'Other');‍‍‍‍
// return Decode($feature.dn, 2, 'Non-Severe', 3, 'Marginal', 4, 'Slight', 'Other');‍‍‍‍ to be more explicit‍‍

Re: Arcade expression to decode values

AndrewL — Tue, 17 Jul 2018 17:39:18 GMT

Great! Thanks, that worked.