New value add to custom picker field

Question

Hi Everyone, I want to add new value using custom picker field . Let's say , I have picker field name country and its having all country but not "XYZ". So how can we add it?

Shubham Aware · Answer

I tried to mimic this scenario Interface - a!localVariables(
 local!countries: { "USA", "India", "Canada" },
 local!selected: null,
 a!pickerFieldCustom(
 label: "Country",
 suggestFunction: rule!POC_CountrySuggest(
 filter: _,
 labels: local!countries,
 identifiers: local!countries
 ),
 value: local!selected,
 saveInto: local!selected,
 selectedLabels: local!selected
 )
) Suggestion Function - a!localVariables(
 local!matches: where(search(ri!filter, ri!labels)),
 if(
 length(local!matches) > 0,
 a!dataSubset(
 data: index(ri!labels, local!matches),
 identifiers: index(ri!identifiers, local!matches)
 ),
 a!dataSubset(
 data: ri!filter,
 identifiers: ri!filter
 )
 )
)

Swathimdas · Answer

Just adding another version on top of Shubham Version, so that it gives clear understanding to the user that new value is being added. You can modify the values in the saveInto of the pickerfield based on your requirement. PickerField: 
 a!localVariables(
 local!matches: where(
 a!forEach(
 items: ri!labels, 
 expression: search( ri!filter, fv!item)
 )
 ),
 a!dataSubset(
 data: if(
 and(
 contains(
 trim(lower(ri!identifiers)),
 trim(lower(ri!filter))
 )
 ),
 index( ri!identifiers, local!matches),
 append(
 touniformstring(
 index(
 { ri!identifiers },
 local!matches,
 {}
 )
 ),
 ri!filter & " (Add new)"
 )
 ),
 identifiers: if(
 and(
 contains(
 trim(lower(ri!identifiers)),
 trim(lower(ri!filter))
 )
 ),
 index( ri!identifiers, local!matches),
 append(
 touniformstring(
 index(
 { ri!identifiers },
 local!matches,
 {}
 )
 ),
 ri!filter
 )
 )
 )
)
 
 UI Preview:

Shubham Aware · Answer

For record type, use selectedLabels: local!selected.name. For better understandign can you please share full code.

Stefan Helzle · Answer

Find a solution in my blog post. 
 appian.rocks/.../