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To specify how validation is to be done, override the validate method.Note that the constructor takes a parent widget, and also allows you to use the value option to specify the initial contents.You may also access the dynamic attributes defined through the model instance, e.g., .Besides using the core validators included in the Yii releases, you may also create your own validators.The validate method simply tries to convert the value to an object of the right kind, and returns None (reject) if that fails.As a rule of thumb, you should never trust the data received from end users and should always validate it before putting it to good use.This should be done by overriding the yii\base\Model::rules() method.
You may implement its validation logic by overriding the yii\validators\Validator::validate Attribute() method.
You may create inline validators or standalone validators.
An inline validator is one defined in terms of a model method or an anonymous function.
You can use any of these attributes instead (or use what you think is the most relevant): Client-side validation based on Java Script is desirable when end users provide inputs via HTML forms, because it allows users to find out input errors faster and thus provides a better user experience.
You may use or implement a validator that supports client-side validation Info: While client-side validation is desirable, it is not a must.