How can I enable or disable a button using a select box as a control?

[#1]

Hello,

I have a button and a multiple selection box like this:

I need enable the button "Pesquisar" only when the user makes a select at "Rodada". While no select was made, the button is disabled.

How can I do this?

Thanks!!!

[swuehl · Accepted solution]

On general tab of the button properties, use this expression for the Enable Condition:

=GetSelectedCount(Rodada)>0

assuming Rodada is your field name the user selects in.

[#3]

Thank you!

It worked as i needed!

[rustyfishbones]

In the Layout tab of the Button, on Show, choose Condition and add the following expression

COUNT(DISTINCT Selecione) = 1

It means the button will only show if you have made a selection