Double conditions to hide/display a field

Hello all,
I have two drop-down menus and a field. In this field, depending on what is selected in both drop-down menus, either a Yes-No choice or a drop-down menu appears.
My problem is that I don't know how to do that.
Could I run a script on the preOpen event of the field that says:
if dropdownmenu1.rawValue == 1 and dropdownmenu2.rawValue == 2
then field.YesNoChoice.presence = "visible"
field.DropDownMenu.presence = "hidden"
Would that work? Where could I get an example for that (if it exists)?
Thanks in advance

Place the code in the Exit event of both the drop downs.
JavaScript is the language.
if (dropdownmenu1.rawValue == "1" && dropdownmenu2.rawValue == "2"){
YesNoChoice.presence = "visible";
DropDownMenu.presence = "hidden";
Thanks
Srini

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