Handles form submission (phx-submit events).
Overridable Functions
submit/3- Submit the form (create or update)transform_params/2- Transform params before submissionafter_save/3- Handle post-save logic
User Override
defmodule MyApp.Form.SubmitHandler do
use MishkaGervaz.Form.Web.Events.SubmitHandler
def transform_params(state, params) do
params |> super(state) |> Map.put("custom_field", "value")
end
endTop-level helpers (format_form_errors/1, extract_form_level_errors/2,
cleanup_temp_uploads/1, push_js_hook/4, merge_defaults/2,
drop_protected_fields/2, field_restricted?/2, field_readonly?/2)
are public so user overrides can reuse them — they live outside the
__using__ macro to avoid per-consumer compile cost.
See MishkaGervaz.Form.Web.Events,
MishkaGervaz.Form.Web.Events.Helpers (for parse_typed_params/2 and
merge_uploaded_files/4),
MishkaGervaz.Form.Web.DataLoader,
MishkaGervaz.Form.Web.UploadHelpers, and the sibling sub-handlers.