The form framework ships a set of server-side validators, which implement Extbase validators. Be aware that not all of the existing validators are available for each form element, e.g. the “Date range validator” is only available for the “Date” element. Furthermore, some form elements (like “Email”) already contain reasonable validators.
With the help of the form element property
you can define custom validation error messages. The message can also
be set within the form editor.
Localization of client side validations¶
The ‘Alphanumeric validator’ checks for alphanumeric strings. Alphanumeric is defined as a combination of alphabetic and numeric characters [A-Z + 0-9].
Date/ time validator¶
The ‘Date/ time validator’ checks if the given value is a valid DateTime object. The date string is expected to be formatted according to the W3C standard which is “YYYY-MM-DDT##:##:##+##:##”, for example “2005-08-15T15:52:01+00:00”.
Date range validator¶
The ‘Date range validator’ checks if the given value is a valid DateTime object and in-between a specified date range. The range can be defined by providing a minimum and/ or maximum date. The validator has 2 options:
- Minimum date: The minimum date.
- Maximum date: The maximum date.
The date string for the above mentioned fields is expected to be formatted according to the W3C standard which is “YYYY-MM-DDT##:##:##+##:##”, for example “2005-08-15T15:52:01+00:00”.
The ‘Email validator’ checks if the given value is a valid email address. The format of a valid email address is defined in RFC 3696. The standard allows international characters and the multiple appearance of the @ sign.
The ‘Empty validator’ checks if the given value is not empty (NULL, empty string, empty array or empty object).
File size validator¶
The ‘File size validator’ validates a file resource regarding its file size. The validator has 2 options:
- Minimum: The minimum file size to accept.
- Maximum: The maximum file size to accept.
Use the format <size>B|K|M|G when entering file sizes. For example: 10M means 10 megabytes. Please keep in mind that the maximum file size also depends on the php.ini settings of your environment.
Floating-point number validator¶
The ‘Floating-point number validator’ checks if the given value is of type float or a string matching the regular expression [0-9.e+-].
Integer number validator¶
The ‘Integer number validator’ checks if the given value is a valid integer.
Non-XML text validator¶
The ‘Non-XML text validator’ checks if the given value is a valid text (contains no XML tags). This basically means, that tags are stripped. In this special case quotes are not encoded (see filter_var() for more information.
Be aware that the value of this check entirely depends on the output context. The validated text is not expected to be secure in every circumstance, if you want to be sure of that, use a customized regular expression or filter on output.
Number of submitted values validator¶
The ‘Number of submitted values validator’ checks if the given value contains the specified amount of elements. The validator has 2 options:
- Minimum: The minimum number of submitted values.
- Maximum: The maximum number of submitted values.
Number range validator¶
The ‘Number range validator’ checks if the given value is a number in the specified range. The validator has 2 options:
- Minimum: The minimum value to accept.
- Maximum: The maximum vlaue to accept.
The ‘MimeType validator’ checks if the given value is a FileReference of the configured type (one of the / IANA media types).
String length validator¶
The ‘String length validator’ checks if the given value is a valid string and its length is in the specified range. The validator has 2 options:
- Minimum: The minimum length of the string.
- Maximum: The maximum length of the string.
Regular expression validator¶
The ‘Regular expression validator’ checks if the given value matches the specified regular expression. Delimiters or modifiers are not supported. The validator has 1 option:
- Regular expression: The regular expression to use for validation.
Imagine the following example. You want the user to provide a domain
name. The submitted value shall only contain the second and the top
level domain, e.g. “typo3.org” instead of “https://typo3.org”. The
regular expression for this use case would be
Custom validator implementations¶
Validators belong to a certain
prototype and are defined within the
validatorsDefinition. The property
implementationClassName is used
for the validator implementation.
TYPO3: CMS: Form: prototypes: standard: validatorsDefinition: Custom: implementationClassName: 'VENDOR\MySitePackage\Domain\Validation\CustomValidator'
You can provide options for your validator using the property
Those will be used as default values which can be overridden within a
Define the default value of the option
TYPO3: CMS: Form: prototypes: standard: validatorsDefinition: Custom: implementationClassName: 'VENDOR\MySitePackage\Domain\Validation\CustomValidator' options: yourCustomOption: 'Jurian'
Override the default value within your
identifier: sample-form label: 'Simple Contact Form' prototype: standard type: Form renderables: - identifier: subject label: 'Name' type: Text validators: - identifier: Custom options: yourCustomOption: 'Mathias'
As mentioned above EXT:form implements Extbase validators. That said,
your own validators should extend
Read more about this topic in the Extbase docs.