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

You can try setting default values for attributes that aren't set:

[
  // set "username" and "email" as null if they are empty
  [['username', 'email'], 'default'],

  // set "level" to be 1 if it is empty
  ['level', 'default', 'value' => 1],
]

more info here

You can also use conditional client-side validation with "whenClient" option when defining you validators:

From the manual:

If you also need to support client-side conditional validation, you should configure the whenClient property which takes a string representing a JavaScript function whose return value determines whether to apply the rule or not. For example,

[
    ['state', 'required', 'when' => function ($model) {
        return $model->country == 'USA';
    }, 'whenClient' => "function (attribute, value) {
        return $('#country').val() == 'USA';
    }"],
]