Need Help with Button Text Change Upon Date Filter in Power BI

For the first part i.e., updating the button text, you can do this.

a) change the measure 

Drill Through Button Text = 
 var _c1 = COUNTROWS( ALLSELECTED(Jobs[Entry Date]))
 var _c2 = COUNTROWS( VALUES ( Jobs[Entry Date] ))
 var _t = IF (_c1 <> _c2 && _c2 >= 1, CONCATENATEX ( VALUES ( Jobs[Entry Date] ) , [Entry Date] , ",") )
 RETURN -- IF ( ISBLANK(_t), "Click Here", _t)
 IF ( ISBLANK(_t), "Select Filter", "Click Here")

b) Select the button and go to the style button, change these settings

Test it, you will see the button changing !

For Part 2 i.e., second measure you can do similar changes and modify the destination setting. or upload the right file, where it is going wrong.

Hope this helps!

Thanks for the reply. The measure you made for 'Drill Through Button Text' does work however I was having an issue now with the navigation measure. It just wouldn't navigate to the desired page. I imagie it was due to the measure. So I changed it to this:

Drill Through Button Text = 
VAR IsEntryDateFiltered = ISFILTERED(Jobs[Entry Date]) || NOT(ISBLANK(SELECTEDVALUE(Jobs[Entry Date])))
RETURN IF(IsEntryDateFiltered, "Click Here", "Select Filter")

So just to recall, the page navigation measure is:

User Drill Through Button Text Navigation = 
VAR IsEntryDateFiltered = ISFILTERED(Jobs[Entry Date]) || HASONEVALUE(Jobs[Entry Date])
RETURN IF(IsEntryDateFiltered, "Page 2", BLANK())

 Thank you very much for your help though. It's greatly appreciated.