Purpose of Validators

Validators are a mechanism to ensure that all information given by the user meet the expectation of the extension. Either if the values make sense in terms of format like zip or in required information value like city.

If values need to be enforce your should use the RequiredValidator because this validator does not only check if the value of the configured field is filled but it also serves as a signal for the Required Partial to render the corresponding flag.

All validators are optional, could be set single or may be even assigned multiple times to a field. Despite the concept of extbase you are free to choose how many validators should take care of a value.

Different possibilities of assigning validators

In case you want to have no validation at all for a field was was configured by default as required you need to empty the associated validators. Look at the example given where the validators of the email gets removed.

Remove validators:

plugin.tx_storefinder.settings.validation.zipcode >

If only one validator is needed you could assign it directly to the field like below.

Assign only one validator:

plugin.tx_storefinder.settings.validation.zipcode =

And finaly it’s possible to have multiple validators for one field like in the next example.

Assign multiple validators:

plugin.tx_storefinder.settings.validation.password {
        1 = Evoweb\StoreFinder\Validation\Validator\RequiredValidator
        2 = StringLength

Regarding validator it’s possible to have values attached to the assigned one. This is beneficial if you want to check against conditions that are not equal in different cases. One point where this is shown best with is the length of passwords.

In total you have three possible combination of validator assignments for each field that you use in your form. You have none, one and multiple validators. And in case of a validator present you can add options too override the default that is set in the validator.

Special validators

The ConstraintValidator is not meant to be used for field validation. This validator is a special construct to make the configuration via TypoScript possible. All others are free to combine. If a validator is only suited for a certain field it will be mentioned in the detail configuration.

Prefixing needed for non extbase validators

To use the extension validators you need to prefix them in the TypoScript with EvowebStoreFinderValidationValidator. For all validators without this prefix the validation assumes that they are extbase specific validators and use them as such.

Secondly this makes it possible to use custom validators that do not come with extbase or store_finder. Just code your validator and make it available for auto loading (either in an extbase standard path or via ext_autoload.php). Afterwards you are ready to use your validator like in the following example.

Custom validator usage:

plugin.tx_storefinder.settings.validation.create.password =
        1 = Evoweb\StoreFinder\Validation\Validator\RequiredValidator

Available validators

Beside the validators that come with extbase and which are although available in the different processes, the registration come with a set of specific ones that are tailored to the special need. The following lists all validators which are suited for the usage on fields.

Validator Options



Data type



This validator serves two purpose. First of check if the field contains a value and that it is not empty. Second the rendering uses this validator as condition to render required sign or not.