Using Condition Event Widgets in Application Studio

I am setting up a kinetic dashboard where a user can enter data into a UD table via some form fields. After the user types in all the information in the fields, I put a button at the bottom for them to click to submit the record to the table.

I am currently working on the click event for this button. First I would like the event to look at all the required fields and make sure there is a value there. I tried to accomplish this with Condition widgets in the event builder. For the condition expression I used some very generic terms like txtLotNum = “”.
My problem is that I don’t know the right syntax for these condition expressions. The documentation doesn’t help clarify this. How do I setup my expression if I want to check each text box (or other control) for a value before completing the event?

Thanks!
Nate

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