Validating input fields

29 Jan

Instead, they will process the values and save them back to the attributes being validated.

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.You may create inline validators or standalone validators.An inline validator is one defined in terms of a model method or an anonymous function.

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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.

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.

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.

I'd say if the form is short and an obvious pattern (like sign up or log in), you could use the placeholder visual pattern, but use real labels instead. You don't need to do any tricky cursor stuff, because it's all semantically wired up already. In order to do that, we'll need to know if the input is empty or not.

If they click the area taken up by the label, it will activate the input. We want to do stuff with :placeholder-shown is super useful for us here!

This is because the same validator will run for each attribute (3 times in total) and we only need to run it once for the whole attribute set.