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JavaScript

Callbacks

Define window.fseCallbacks before the formseal script tag to hook into form events.

<script>
  window.fseCallbacks = {
    onSuccess: function(response) {
      // response = your endpoint's JSON response
    },
    onError: function(error) {
      // error = Error object
    }
  };
</script>
<script src="/formseal-embed/globals.js"></script>

onSuccess fires after a successful POST. onError fires on network failure — not on validation errors, which are handled inline.

Skipping the status element

If you want full control over messaging, set status: null and handle everything in callbacks:

var FSE = {
  status: null,
};

Event reference

Event Trigger onError called?
Validation failure Missing or invalid field No
Network error POST fails Yes
Success POST returns 2xx No — use onSuccess