Enhance user registration form

Question

I want to enhance the user registration form. I want to add a drop-down menu to show usergroups. I already have created a plugin for this and the drop-down is showing.

I have used an XML file to load the usergroup field. However I don't want to show all usergroups.

How can I determine which usergroup are shown in the drop-down box?

Furthermore the value from this standard form usergroup is not saved. How can I save the chosen usergroup?

This is the code:

public function onContentPrepareForm($form, $data)
{
    if ($form->getName() != 'com_users.registration') {
        return;
    }
    $form->loadFile(dirname(FILE) . '/forms/form.xml');
}

and this is the form field in the XML file:

<field name="guest_usergroup" type="usergroup" label="klas" description="klass" multiple="true" />

Answer 1

You are using existing usergroup field for displaying usergroup dropdown in which there is no option to limit the list of usergroup to display in dropdown list.(Unless you edit the field element)

If you do not want to display all the usergroups then better you should create custom field in which you can filter the usergroups you do not want to display.

On another note, there are many extensions available which can solve your purchase.

Usergroup Selector is one of those extension. Using this plugin you can allow your users to select the usergroup at the time of registration.