Question

I have a form that use displayFieldError when submitted to display errors on fields. I need to show/hide a container on certain error conditions, is possible to chain a js action on it?

Answer 1

Extending and redefining methods is a normal practice in Object Oriented development. Besides, you can do that globally by creating this:

class Form extends Form_Basic {
    function displayFieldError(){
        .. your actions ..
    }
}

This will work across your project and will not loose any functionality.