Params Validator element

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

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

Available validators:

name	Description	Parameter required
req	Required value.	No
alpha	Alphabetic value.	No
alphanum	Alphanumeric value.	No
dec	Decimal value.	No
num	Numeric value.	No
email	E-mail value.	No
url	URL value.	No
maxlen	Set the maximum length allowed.	Yes
minlen	Set the minimum length required.	Yes
lt	Less than.	Yes
gt	Greater than.	Yes
min	Minimum value.	Yes
max	Maximum value.	Yes
regexp	Regular expression.	Yes
plugin	Create your own form validator. More information at Creating your own Form Validator plugin.	Yes

Parent:

Basic example

Value is required “req”.
Value must be a decimal value “dec”.
The maximum length of the decimal value is 6 digits “maxlen”.

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

Regular expression

If you want a validation that is not included in these predefined ones, you can use a regular expression. 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>