Success Management
Each Output Workflow is able to process its own success workflow.

Simple Text
If you're adding a text type, the form is just returning the text value you could use for a output. "Thank you for your message" for example.
Snippet
A Snippet could be useful if you need more output structure. FormBuilder will render the snippet and return its html data.
Redirect to Document
Use a document to get its path to perform a redirect for example.
Flash Messages on Redirect
If you're using Document as a success handler you're able to define a flash message.
To define a flash message you need to fill out the Flash Message below.
Flash Messages Implementation
Be sure you have included the twig template somewhere on top in your main layout:
{% include '@OpenDxpFormBuilder/Common/redirect_flash_message.html.twig' %}
Javascript Example
This is how your javascript listener could look like:
$('form.ajax-form').on('formbuilder.success',
function (ev, message, redirect, $form) {
if (redirect) {
document.location.href = redirect;
} else {
alert(message[0]['message']);
}
}
);