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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, the number validator supports too Big and too Small to describe the validation failure when the value being validated is too big and too small, respectively.
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.
If an attribute fails the validation, call yii\base\Model::add Error() to save the error message in the model, like you do with inline validators.
For example, the inline validator above could be moved into new components/validators/Country Validator class.the validation of one attribute depends on the value of another attribute you can use the when property to define such conditions. The following examples shows how to trim the spaces in the inputs and turn empty inputs into nulls by using the trim and default core validators: You may also use the more general filter validator to perform more complex data filtering.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.]]
June 30, 1998 | Fredrik Lundh This module implements a validating version of the Tkinter Entry widget.