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How to create error message if user hasn't selected any checkboxes

Hi,

I have a series of sliders with several checkboxes in each one. I am currently working on making each selected checkbox appear in the final “completion” slider which I sort of have an idea on how I’m going to achieve this BUT I’m a little puzzled about how to make an error message if zero checkboxes were selected for all the sliders before the completion page.

https://preview.webflow.com/preview/pjx-mini-slider-25adea484-019a01c442ec0?utm_medium=preview_link&utm_source=dashboard&utm_content=pjx-mini-slider-25adea484-019a01c442ec0&preview=bc66c0b51990e09668403097c1123adb&mode=preview

Any ideas?

Do you want only one checkbox to be able to be selected? if so, use radio buttons, not checkboxes.