Checking grid event or event of textbox used for selection

[DButler]

I'm using a grid to process orders with a textbox widget used for row selection with various options. I loop through this grid in RPG using READC. When a selection is made with certain conditions, I need to pop up a Confirm dialog basically asking "do you really want to do this?", and then act accordingly. Do I add the javascript to the grid event or to the selection textbox event? How does it know what row is selected?
Thanks,

Don