How to describe actions after a checkbox is checked (or not selected) in Yii2?

Question

Yii

There is a certain model, controllers and views generated by Gii.
The form must contain a checkbox, when checked, something must happen that is not described in the actions of the generated controller. How to do it?
I can't figure out how to make a condition construct.

Answer 1

there must be something that is not described

zashib explanation of the problem.
I can't understand you at all.
You think of a concrete example. "it is necessary to open a modal when clicking on the checkbox" or "it is necessary to load the data of the current user when clicking on the checkbox"