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You may use or implement a validator that supports client-side validation Info: While client-side validation is desirable, it is not a must.

Its main purpose is to provide users with a better experience.

When yii\base\Model::validate() is called, it will call two methods that you may override to customize the validation process: To validate attributes only when certain conditions apply, e.g.

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For example, the inline validator above could be moved into new components/validators/Country Validator class.

In this case we can use yii\validators\Validator::add Error() to set customized message for the model.

Below are some examples: Note: By default, inline validators will not be applied if their associated attributes receive empty inputs or if they have already failed some validation rules.

If you want to make sure a rule is always applied, you may configure the skip On Empty and/or skip On Error properties to be A standalone validator is a class extending yii\validators\Validator or its child class.

An inline validator is one defined in terms of a model method or an anonymous function.

The signature of the method/function is: If an attribute fails the validation, the method/function should call yii\base\Model::add Error() to save the error message in the model so that it can be retrieved back later to present to end users.

The following example shows how the validation rules for the Most validators have default error messages that will be added to the model being validated when its attributes fail the validation.

For example, the required validator will add a message "Username cannot be blank." to a model when the Some validators may support additional error messages to more precisely describe different causes of validation failures.

For example, If you also need to support client-side conditional validation, you should configure the when Client property which takes a string representing a Java Script function whose return value determines whether to apply the rule or not. As you can see, these validation rules do not really validate the inputs.

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