I'm designing a business application.
When the user enters the main data entity in the application part of the form is tabular. Since some of the users will have an intensive usage of this application, I want to make sure that keyboard navigation is possible. I think that using arrow keys to navigate up/down is standard, but how do I combine thes with using the arrowkeys in the drop downs as well?
To be specific: When a cell in the table gains focus, it should be immediately editable. For cells that contains a drop down this means that arrow down should expand the dropdown and set focus on the next first/next entry in the klassification.
So what key(s) should I use to navigate the lines of the table, or should I settle on only using the TAB key/ SHIFT+ TAB to let the user move forward/backwards, and not supporting moving directly up/down