Showing a form field only when a specific value of another field is selected, out of the box?

Question

Yii

I have a model field fieldFirst, select.
And the second field.
the second field should be offered for filling only with a certain choice from the list of the first field.
I know how to set conditional validation through when.
But the display / disappearance of the field itself Second, is there such a thing out of the box?
Well, not to write your own js for this form.

Answer 1

You change display: none in the style via js and that's it.