Adobe PDF FORM: how to make a dropdown option to populate a textfield?

[Rodrigo23877206a2zm]

Hello there.
I have this form, and it has a dropdown with 10 options. I want to make it fill a text field with the options I click in the dropdown, as if it is a multiple choice menu.
Does anybody knows a script for this?

[Nesa Nurani]

As Validation script of dropdown field use this (just change text field name to your actual field name):

this.getField("Text1").value = event.value;

If you have choice  in dropdown that you want set text field to be empty when selected (lets say that choice is blank space) use this:

if(event.value == " ")
this.getField("Text1").value = "";
else
this.getField("Text1").value = event.value;

[Rodrigo23877206a2zm]

Thank for your quick answer.
I have another issue, although.

I need this code to populate several lines of the same textfield or several  different textfields. What should I write to the code in order for this to work?