How to switch on\off frontend form validation for some fields in yii2?

Question

I have got difficult form in yii2 view, where some fields show or hide. It decide from user field choises, select options in the form. I write this frontend logic with custom jq

Answer 1

To remove a field from validation:

$('#yourFormID').yiiActiveForm('remove', 'yourinputID');

To add a field to validation list:

$('#yourFormID').yiiActiveForm('add', {
id: 'country',
        name: 'yourinputID',
        container: '.field-inputID', //or your cllass container
        input: '#yourinputID',
        error: '.help-block',  //or your class error
        validate:  function (attribute, value, messages, deferred, $form) {
            yii.validation.required(value, messages, {message: "Validation Message Here"});
        }
    }); 

And don't forget conditional validation in your model. More info