Metadata Validator element

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

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

• Metadata Checkbox field
• Metadata Input field
• Metadata Select field
• Metadata Suggestbox field
• Metadata TextArea field

Available validators:

name	Description
req	Required value.
alpha	Alphabetic value.
alphanum	Alphanumeric value.
dec	Decimal value.
num	Numeric value.
email	E-mail value.
url	URL value.
maxlen	Set the maximum length allowed.
minlen	Set the minimum length required.
lt	Less than.
gt	Greater than.
min	Minimum value.
max	Maximum value.
regexp	Regular expression.
plugin	Create your form validator. More information is available 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 ones. For example, imagine you want to restrict an input to lowercase ASCII values:

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