Register a user to a specific group

Question

I'm trying to register a user from the front-end and assign them to a specific group. I know that via control panel I can set a default user group, but there is a registration instance where I need the registrant to be assigned to a different group.

I tried this to no avail...

<input type="hidden" name="groups" value="4">

Answer 1

You can only do this with custom PHP otherwise this is going to be a high security risk. Imagine someone just changes your HTML and inserts a different group id: everyone could just join the group he/she likes.

Instead you can Enhancing a Craft CMS 3 Website with a Custom Module - there is already a default one and insert an event to do this by yourself but you need to be careful. I wouldn't trust user input in that case too much.

Event::on(
    Elements::class,
    Elements::EVENT_AFTER_SAVE_ELEMENT,
    function(ElementEvent $event){
        if(\get_class($event->element) === User::class){
            $joinSpecialGroup = (bool)Craft::$app->getRequest()->getBodyParam('joinSpecialGroup');
            if($joinSpecialGroup === true){
                Craft::$app->getUsers()->assignUserToGroups($event->element->id, [4]);
            }
        }
    }
);

Note: I woulnd't call the property joinSpecialGroup - it is just for demonstration

Answer 2

We just had to do this and tried Freeform Pro and their Element Connection feature. It took a few minutes to build the whole thing including all the required emails.

https://solspace.com/craft/freeform/docs/user-registration-forms/

Also - just noticed Craftquest has a free tutoarial on building user registration form using Freeform.

https://craftquest.io/courses/managing-forms-with-solspace-freeform/5246