This depens ofcourse on your data.
Assuming you have a Date field you can create a week field in your loading script by using:
Year(DateField) as Year,
Week(DateField) as Week,
Now you can create a button with 2 actions
action 1 : Select in field
Field : Year
Search String: =Year(Today())
action 2 : Toggle Selection
Field : Week
Search String: =Week(Today())
This will select the current year and then the current week.