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

A complete processing of user input is shown in the following example code, which will ensure only integer values are stored in an attribute: for values that are not bound to any model.

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.

You may create inline validators or standalone validators.

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

Given a model populated with user inputs, you can validate the inputs by calling the yii\base\Model::validate() method.

The method will return a boolean value indicating whether the validation succeeded or not.

It uses the textvariable option to attach a String Var variable to the widget, and uses the variable trace function to keep track of what’s going on.You may also override yii\validators\Validator::validate Value() instead of ) when attaching validator.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.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.

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