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';
    }"],
]

Answer 2

To disable client side validation. Begin your active form like this.

ActiveForm::begin(['enableClientValidation'=>false]);

Answer 3

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 ...

Answer 4

$form->field($model, 'youAttribute', ['enableClientValidation' => false])->textInput();

The ActiveField class has a property enableClientValidation, you can simply set this property to false if you want to disable clientValidation form some fields.

Answer 5

You can set your active field using this code: (not active record, activefield exactly)

$activeField = $form->field($model, 'someField');
$activeField->enableClientValidation=false;
$activeField ->enableAjaxValidation=false;

Answer 6

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