Metadata Validator element

The goal of the Validator element is to ensure that the user provides the necessary, properly formatted information to complete an operation successfully.

The validator can only be used in combination with other fields:

Available validators:

name	Description
req	Required value.
alpha	Alphabetic value.
alphanum	Alphanumeric value.
dec	Decimal value.
num	Numeric value.
email	Email value.
url	URL value.
maxlen	Maximum allowed length.
minlen	Minimum required length.
lt	Less than.
gt	Greater than.
min	Minimum value.
max	Maximum value.
regexp	Regular expression.
plugin	Create your own form validator. More information at Creating your own Form Validator plugin.

Parent:

Basic example

Value required: “req”.
The value must be a decimal: “dec”.
The maximum length of the decimal value is six digits: “maxlen”.

<input label="Decimal value" name="okp:consulting.decimal">
    <validator type="dec" />
    <validator type="req" />
    <validator type="maxlen" parameter="6" />
</input>

Regular expression

You can use a regular expression if you want a validation that is not included among these predefined validators. For example, imagine you want to restrict an input to lowercase ASCII characters:

<input label="Lowercase value" name="regExp">
    <validator type="regexp" parameter="[a-z]+" />
</input>