Component: Dropdown TypeError: option.toLowerCase is not a function (PringNG 17.0 + 17.1)

[rburgst]

Describe the bug

Ever since upgrading to primeng 17.x the dropdown is broken, at the very least when using it with a form control.
Might be related to #14241

Environment

Mac OSX, Chrome

Reproducer

https://stackblitz.com/edit/hhk8ms?file=src%2Fapp%2Fdemo%2Fdropdown-reactive-forms-demo.html

Angular version

17.0.5

PrimeNG version

17.1.0

Build / Runtime

TypeScript

Language

TypeScript

Node version (for AoT issues node --version)

20.10.0

Browser(s)

Chrome

Steps to reproduce the behavior

1. open the dropdown
2. enter something in the filter box

Expected behavior

it should work

[urielzen]

I have the same issue

[urielzen]

possible duplicate of:

#14311

[rburgst]

setting the filterBy seems to improve the situation just as described in #14311 . I am still experiencing a variant of #14241 where the selected element is not showing up (in a form array).

[yassine-fy94]

Also the filterBy option is not working

[Orion151-C]

It works for me, i forked your stackblitz https://stackblitz.com/edit/hhk8ms-gucjhk?file=src%2Fapp%2Fdemo%2Fdropdown-reactive-forms-demo.html and it works, only added "filterBy"

[CyleClone]

I've updated my project to 17.4.0 and the filter still throws the same error.
Error appears to happen when you keep the standard setting of reading label.

As others have mentioned adding filterBy would solve the issue. Alternatively setting optionLabel="label" would also solve it.
But changing attributes for more than 100+ dropdowns isn't really viable.

Additionally the Dropdown loses it's chosen value while filtering.
Forked original Stack to update PrimeNG package and show the last point:
https://stackblitz.com/edit/hhk8ms-8g5ykm?file=src%2Fapp%2Fdemo%2Fdropdown-reactive-forms-demo.html

[Reflection281]

I must agree, I have the same problem with the same version. The bug of losing its selected value when filtering is really weird. It loses the value when typing, but it reappears when you delete the typed characters.