Changing Variable Value When Field Is Cleared Of Selections

[cgT]

Hi everyone,

I have a field called 'TransactionDate' which, when I clear it, needs to change the value of a variable, vLastWeekTrans, to 0.

I'm trying to use the current expression in the variable's 'Definition' box and am not getting any result:

=if(GetSelectedCount(TransactionDate)<1, 0,1)

Thanks in advance for any help. 

[cgT]

Hello,

I'm still unable to get the alternate state to work on the button. But I'm also having another issue. Without changing anything, I'm now seeing the button background and font changing only after a second click of the button. Also, the clearing of the field no longer sets the variable to '0'.

I've attached my app, sans data, for somebody to look at if possible please.

Many thanks for your help.