Server-side form validation

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After submitting a form, you should validate your data. In Joomla this can be done via the JForm validate method (normally called in the controller via the model JModelForm).

Unlike client-side validation, the validation uses html attributes to do its validation. There is the attribute required ("true" or "required") which makes a field required and the attribute validate with a joomla or custom rule value.

E.g. field in a joomla form xml

<field name="email" type="text" class="inputbox" description="Fill in your E-mail" label="E-mail" required="true" validate="email" size="30" />

Validation rules

Rule Description Availability


Accepts only the values '0', '1', 'true' or 'false' (case-insensitive). Joomla 11.1 and newer


Todo Todo (e.g. Joomla 1.5 and newer)


Todo Todo (e.g. Joomla 1.5 and newer)


Todo Todo (e.g. Joomla 1.5 and newer)


Requires the value entered be one of the options in a field of type="list" Joomla 11.1 and newer


Todo Todo (e.g. Joomla 1.5 and newer)


Telephone number (nanpa, ITU-T T-REC-E.164 or ietf rfc4933) Joomla 11.1 and newer


Todo Todo (e.g. Joomla 1.5 and newer)


Todo Todo (e.g. Joomla 1.5 and newer)

You can find the specific implementation of these rules in \libraries\joomla\form\form.php - validation begins in the function validate(), moves to validateField(), which then calls the respective validation functions of \libraries\joomla\form\rules\*.php

Server- or Client-side validation?

Form validation