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[edit]
| Rule | Description | Availability |
|---|---|---|
|
boolean |
Accepts only the values '0', '1', 'true' or 'false' (case-insensitive). |  and newer
|
|
color |
Todo | Todo (e.g.  and newer)
|
|
|
Todo | Todo (e.g. and newer)
|
|
equals |
Todo | Todo (e.g. and newer)
|
|
options |
Requires the value entered be one of the options in a field of type="list" | and newer
|
|
rules |
Todo | Todo (e.g. and newer)
|
|
tel |
Telephone number (nanpa, ITU-T T-REC-E.164 or ietf rfc4933) | and newer
|
|
url |
Todo | Todo (e.g. and newer)
|
|
username |
Todo | Todo (e.g. 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