Conditional next button for a form type slide

Hi,

I am building a module where there is a slide with text entries that are mandatory. I know how to create a conditional next button when all the text entries are visited but how can i make sure that all the text entries are not blank?

So, even if a person just clicks on all the text entry "controls" without typing anything he/she can go to the next slide because the text entries are visited.

How can i make sure that the text entries are not blank? Please Help.

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