النموذج

    <.form
  :let={f}
  for={@form}
  action="/account/terms"
  method="post"
  class="flex flex-col gap-space-lg w-full max-w-xl"
>
  <.checkbox field={f[:terms]} class="checkbox">
    <:label>Accept terms</:label>
    <:indicator>
      <.heroicon name="hero-check" />
    </:indicator>
    <:error :let={msg}>
      <.heroicon name="hero-exclamation-circle" class="icon" />
      {msg}
    </:error>
  </.checkbox>

  <.action type="submit" class="button ui-accent">
    Submit
  </.action>
</.form>

  

    def account_terms_page(conn, _params) do
  changeset = MyApp.Forms.Terms.changeset(%MyApp.Forms.Terms{}, %{})

  form =
    Phoenix.Component.to_form(changeset,
      as: :terms_changeset,
      id: "account-terms-changeset-form"
    )

  render(conn, :account_terms, form: form)
end

def account_terms_create(conn, %{"terms_changeset" => params}) do
  case MyApp.Forms.Terms.changeset(%MyApp.Forms.Terms{}, params) do
    %Ecto.Changeset{valid?: true} = changeset ->
      data = Ecto.Changeset.apply_changes(changeset)
      conn
      |> put_flash(:info, "Saved: terms=#{data.terms}")
      |> redirect(to: "/account")

    changeset ->
      changeset = Map.put(changeset, :action, :insert)

      form =
        Phoenix.Component.to_form(changeset,
          as: :terms_changeset,
          id: "account-terms-changeset-form"
        )

      render(conn, :account_terms, form: form)
  end
end

  

    <.form
  :let={f}
  for={@form}
  action="/account/terms"
  method="post"
  class="flex flex-col gap-space-lg w-full max-w-xl"
>
  <.checkbox field={f[:terms]} class="checkbox">
    <:label>Accept terms (strict messages)</:label>
    <:indicator>
      <.heroicon name="hero-check" />
    </:indicator>
    <:error :let={msg}>
      <.heroicon name="hero-exclamation-circle" class="icon" />
      {msg}
    </:error>
  </.checkbox>

  <.action type="submit" class="button ui-accent">
    Submit
  </.action>
</.form>

  

    def account_terms_strict_page(conn, _params) do
  changeset =
    MyApp.Forms.Terms.changeset_validate(%MyApp.Forms.Terms{}, %{})

  form =
    Phoenix.Component.to_form(changeset,
      as: :terms_validate,
      id: "account-terms-validate-form"
    )

  render(conn, :account_terms_strict, form: form)
end

def account_terms_strict_create(conn, %{"terms_validate" => params}) do
  case MyApp.Forms.Terms.changeset_validate(%MyApp.Forms.Terms{}, params) do
    %Ecto.Changeset{valid?: true} = changeset ->
      data = Ecto.Changeset.apply_changes(changeset)
      conn
      |> put_flash(:info, "Saved: terms=#{data.terms}")
      |> redirect(to: "/account")

    changeset ->
      changeset = Map.put(changeset, :action, :insert)

      form =
        Phoenix.Component.to_form(changeset,
          as: :terms_validate,
          id: "account-terms-validate-form"
        )

      render(conn, :account_terms_strict, form: form)
  end
end

  

    defmodule MyApp.Forms.Terms do
  use Ecto.Schema
  import Ecto.Changeset

  embedded_schema do
    field :terms, :boolean, default: false
  end

  def changeset(terms, attrs \\ %{}) do
    terms
    |> cast(attrs, [:terms])
    |> validate_required([:terms])
    |> validate_acceptance(:terms)
  end

  def changeset_validate(terms, attrs \\ %{}) do
    terms
    |> cast(attrs, [:terms])
    |> validate_required([:terms], message: "can't be blank")
    |> validate_acceptance(:terms, message: "must be accepted to continue")
  end
end

  

    <form
  action="/register"
  method="post"
  class="flex flex-col gap-space-lg w-full max-w-xl"
>
  <input type="hidden" name="_csrf_token" value={Plug.CSRFProtection.get_csrf_token()} />
  <.checkbox
    name="user[accept_terms]"
    class="checkbox"
  >
    <:label>Accept terms</:label>
    <:indicator>
      <.heroicon name="hero-check" />
    </:indicator>
  </.checkbox>
  <.action type="submit" class="button ui-accent">Submit</.action>
</form>

  

    def register_create(conn, %{"user" => %{"accept_terms" => terms}}) do
  checked = Phoenix.HTML.Form.normalize_value("checkbox", terms)

  conn
  |> put_flash(:info, "Submitted: terms=#{inspect(checked)}")
  |> redirect(to: "/register")
end