How to upper case & lower case in oracle apex

Go to the Item Property
Advanced > Custom Attributes
Type the below Code:
/
onKeyUp="this.value = this.value.toUpperCase()"                         ---database insert apex view & upper

///
style="text-transform:uppercase"
/
style="text-transform:uppercase"

for Lower Case:
style="text-transform:lowercase"
/
style="text-transform:lowercase"
when you save and run the page, you will see what ever the user types, inline it will be auto converted to upper case.