How to set a switch default value to the first index, not knowing the actual values

Community Usage questions
1

Hello,

Which expression should I use in order to set a switch default value to the first index, no matter what values the switch is currently holding ? I don’t really care if the values are not sorted, I just need one to be selected.

In my case I can’t know the key and value in advance but the switch is never empty since its values are set by an external script which rewrites the .json file.

2

You can set the switch’s default property as follows:

JS{{
return Object.values(@{this.values})[0]
}}

Note that the default property is only applied when loading the json file.

1 Like
3

Merci beaucoup pour la réponse super rapide !

4

This only works if there is more than 1 value within @{this.values}, at least for me. If the list length is only one, I'll always get just empty, blank default switch displayed. If I interact I can choose the one and only existing value.. hmm any suggestions what's going on here? How to correctly always choose the first one as default value? Sorry I can't get it ..

by the way: I use an menu instead of a switch with values set to a list variable:

JS{{
return @{variable_mylist}
}}

The list contains strings like ["test1","test2", ..]

If length(variable_mylist) == 1 the menu is blank (no default value set) - why is that?

if length > 1 it works ..

5

Which version are you using ? It works fine on the latest release.

JS{{
return Object.values(@{this.values})[0]
}}

If values is a array (["a", "b"]) instead of an object ({"label a": "a", "label b": "b"}), it can be simpler:

JS{{
  return @{this.values}[0]
}}

And shorter if want:

#{@{this.values}[0]}