Storyline Question on Locking Next Button

Hello,

I have a course and some of the slides have data entry boxes where I ask the learner to type in a response and then click the next button to move on. I know  how to lock  the next button for slides without data entry boxes (i.e how to add a variable  that says next button only works after timeline ends or after all hotspots are clicked, etc.) but I'm wondering if there is a variable I can add to lock the next button on these slides until the learner has typed responses  in the boxes?

I don't want them to just be able to click next and not put anything in the box. Is this possible? 

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