Apply Javascript to Marketo Forms

Alexis_D_Alba1
Level 5

Does anyone know how to add javascript to a form so that only have the fields with values "true" display on form. For example "You are subscribed to x, y, z"  The fields I want to display are check boxes. I do not want fields that are "false" and would not be checked to display.  I understand that I need javascript to do this, but i'm not sure how to begin this process. Is the javascript looking at the lead database, or the form itself?

Thanks!

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