How to show a relevant value in alv table, when i press enter key

I created a alv table. in this table there is a column called user id, and the other column called user name.
what do I want:
i wanna input a value in column user id eg. user id = D1111; when i press the enter keyboard, the column user name will be shown the value, which is relevant with user id.

Hi,
My first idea :
Catch the event enter in ALV and select the name using the userid.
This will be useful:
Event Handler onEnter in ALV
ON_DATA_CHECK - Web Dynpro for ABAP - SAP Library
also this:
ON_CELL_ACTION - Web Dynpro for ABAP - SAP Library
Have fun,
Hancila

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