Populate a second field depending on dropdown selection

[Paul]

I implemented the code, but the second field doesn't populate.

[kev1n]

I created a quick demo, and it works as expected. You can inspect the object properties, JavaScript, etc.
I assume you’ve adjusted the object IDs accordingly (Field1, Field2)?

https://test.nubuilder.cloud/?index.php ... 29aab&r=-1

Otherwise, please share your code and the actual object IDs — without that, it’s nearly impossible to know what’s not correct or going wrong.