A user can submit the form only once

It’s possible, but you would need to write some custom code for that.

I can break it down for you, but I can’t do the implementation as that falls out of scope of this support forum.

1. On form-submit, you need to set a value linked to the user that indicates they have submitted the form
2. Before loading the form, you need to check the value

1. if it’s set, you should render a message telling the user that they have already filled out the form
2. if it’s not set, just show the form

• This reply was modified 4 years, 2 months ago by Jules Colle.

Thank you very much for your quick reply.

What do I need to do to share this with me?

You could hire a developer to implement this for you. A platform to hire great developers is codeable.io. Alternatively, you could head over to my website bdwm.be and get in touch with me.

I found one, but once the user submits the form, it doesn’t write that you’ve submitted it once. And it lets you send it several times.

function one_user_once($result, $tag) {
    $formName = 'Contact form 1'; // This is the form name for English and spanish
    $fieldName = 'your-email'; // Name of the field to validate, which is the email field
    $errorMessage = "you've signed up already"; // error message
    $name = $tag->name;
    if ($name == $fieldName) {
        if (is_already_submitted($formName, $fieldName, $_POST[$name])) {
            $result->invalidate($tag, $errorMessage);
        }
    }
    return $result;
}
add_filter('wpcf7_validate_email*', 'one_user_once', 20, 2);