SharePoint 2016 Form

Question

I have a custom list with a Yes/No check box. If the box is checked No I would like a pop up message that reads Not Authorized. The field has no formula feature. How can I do this?

Answer 1

Hi @Maurice Gibson ,

We could add a content editor web part in New Items form, then add the code in the txt file.

Every time we add a new item, if you do not check the box, the warning box will show:

Note: This will only works on new items page, not work on all items and edit items page.

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Answer 2

as it was suggested you can do that with custom javascript injected to form. E.g. here you may find example of such javascript: How to display text when a SharePoint custom new form field which is a checkbox is selected.