Freeforms - add error I've created a plugin that will check for a unique email address in the submissions of Freeform.
Because I don't want this check to be done with Ajax, I use the Freeform hook 'onBeforeSave'.

Whenever a email is already used, I want the user to know. I'm telling Freeforms that the form is not valid:

craft()-&gt;on(
    "freeform_submissions.onBeforeSave",
    function (Event $event) {

        // Let Freeform know the form is not valid
        $event-&gt;performAction = false;
    }
);


Unfortunately I haven't found a way to communicate this to the frontend. It would be nice if I could set a Freeform error message.

Any solutions?
I've contacted Freeforms (Solspace). Unfortunately there is no solution for this problem (yet). Solspace told me:


  This functionality currently isn't possible with Freeform. It's something on our feature requests list though.