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

For your Form, use whenClient:

['name', 'required', 'when' => {serverSide Condition),
            'whenClient' => "ut_utils.isAttributeVisible",
        ],
        ['name', 'string', 'min' => 2, 'max' => 28],
        ['name', 'trim'],

And in ut_utils (JS):

/**
     * Useful for FE validation (whenClient) to validate only if visible (ie valid input)
     *
     * @param attribute  Obj containing all sorts of info about attr including container name :-)
     * @param value
     */
    isAttributeVisible: function (attribute, value) {
        return $(attribute.container).is(':visible');
    },

You will need to add 'when' to validate serverside too you can add specific logic here or use a scenario to exclude attributes from being validated ...