javascript ( if/else) for dropdownbox witn "custom input allowed"

[Elsje2002]

Hello, I've created a dropdown box and clicked "custom input allowed". Each input value has an export value assigned, which then appears in a separat textfield. That works, if I select the input value via dropdown. If I write in manually nothing happens. Here the same export value should appear in the textfield. And if the customer makes an input which doesn't exist, a window should open "Check your details". Can someone help me, how and especially where I can enter this script? In the attachment my example (unfortunately you can not upload it as a pdf). Thank you in advance!

[Karl Heinz Kremer]

Correct, you cannot attach a PDF file to a comment here (only images and videos are supported). To share  PDF file, you need to upload it to a file sharing site and then post the link here. You can use Adobe's Document Cloud. Instructions to do that are here:

Share Documents via Adobe's Document Cloud - KHKonsulting LLC

[Elsje2002]

vielen Dank, schauen wir ob es funktioniert hat:

Dateien freigegeben - Acrobat.com

Das wäre dann die Datei...

[Elsje2002 · Accepted solution]

I'm glad to say I've got the answer from someone 🙂

For all who need it: