Validation on required fields

Hi,

I am trying to achieve default highlighting of empty required fields on interface load, without the need of additional user interaction, while the submit button should skip all of those validations.

Using the required function is not possible, since it triggers only on submit, while using validations would also be difficult, because they do not handle null values. Is there any way of achieving this in Appian?
 
Thanks in advance
 

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