Genexus: selected rows

Question

I'm working with a grid that allows selection. I have a variable whose Control Type is Check Box.

I want to enable a button if at least one row is selected, otherwise the button should be disable.

To achieve this I'm using the event "Click" of the CheckBox variable.

How can I get the number of selected rows? Thanks in advance.

Environment: (C# Web) GeneXus X Evolution 2 Version: 10.2.54798

Answer 1

Try this:

Event Refresh
    &count = 0
EndEvent

Event Checkbox.Click
    if Checkbox = true
        &count += 1
    else
        &count -= 1
    endif
    if &count > 0
        Button.enabled = 1
    else
        Button.enabled = 0
    endif
EndEvent

In this sample &count has the number of selected rows.