Global variable = value of a field in record grid selected

Applications Grid / Reports
#1

I would like to pass the value of a field of the selected row in the grid to a variable.
Each time I click on a row that becomes the selected one, the value of a field updates the variable.
It’s possible?

#2

you can use ajax event on click and set in the event the variable to the field value

#3

but the ajax event on click can only be set on the field but not on the entire row