I suppose you want to delete multiple records based on the checkbox cjecked/unchecked...
If I'm correct then you should work like Teodor suggested here:
Inside your formRepeat you will include a hidden input of the Journal_id and the select checkbox input. BOTH OF THEM WITH dynamic ids (dmx-bind:id).
Then on Del Journal click, in your serverconnect_form, you add a repeat based on your page's formrepeat and check if checkbox (upd_delJournal.value==1) then delete the current record.
**Just for safety, instead of deleting the record, add a setValue with the current journal_id and output it.
So when you run ir in your browser, on "Del Journal" click you will be abvle to see if the correct ids are outputed. Then you will be safe to replace the setValue with the final DB Delete procedure.
If something is not clear for you please ask