Force Upper case value in Oracle APEX Text fields

CSS is one of the best ways to quickly customize some of the Apex constructs.

Follow below steps to force Upper or Lower case values in a Text field -

Navigate to the Item Property

Go to Advanced section -> Custom Attributes

Enter below CSS to force Uppercase values:

style="text-transform:uppercase"

Enter below CSS to force Lowercase values:

style="text-transform:lowercase"

Save and run the page. With above CSS added, as soon as a user enters anything in this field, it will be transformed in Upper or Lower case values.