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I want to hide some form fields by default, and only reveal in groups them depending on a checkbox.
If a user shows some fields, fills them in, but then rehides them using the checkbox, will the data submit anyway if the fields have something in them or should I empty them using JavaScript?
The fields will send anyway, but your service which is receiving the post should just look for the value of that checkbox and ignore the values at that point. Either that or you will need to clear the fields.