capital letter always

Hi francois marais, I've created a sample SL file as per your requirements. Add an execute javascript trigger in SL as per your requirement (timeline starts/ends or when user clicks).

Code for ALL CAPS:
var player = GetPlayer();
var newVar = player.GetVar("TextEntry");
newVar = newVar.toUpperCase();
player.SetVar("TextEntry", newVar);

Code for Initial Caps:
function capitalizeFirstLetter(string) {
return string.replace(/\b\w/g, function(l){ return l.toUpperCase(); });
}

var player = GetPlayer();
var newVar = player.GetVar("TextEntry");
newVar = capitalizeFirstLetter(newVar);
player.SetVar("TextEntry", newVar);

Let me know ff you need any further help!

There are some fonts that have only capital letters. You might  use one of them to format it.

Yes thanks Walt

it is finally the solution that I had kept because it is the simplest to implement