Alert POPUP in CARD due to a condition

Is there a way to trigger an alert popup in a Card Widget?
I would like for example if the user check a checkbox (meaning he finished the task),
if another field is still empty, it cannot be possible, warn him and not allowing him to submit with the “check” field until all the requirements are respected.
I put a red background color but it’s still not enough sometimes.
Is the only solution is to make a custom widget with a form with all these controls in javascript ?

Hi Sao,

You can use Access Rules for this and block any updates to a record when some conditions are not met. Here is a link to the documentation with a sample configuration you might find helpful.