Controller Form

    <.form
  for={@form}
  action={~p"/radio-group/form"}
  method="post"
  class="flex flex-col gap-space-lg w-full max-w-xl"
>
  <.radio_group field={@form[:choice]} class="radio-group" items={Corex.List.new([
  %{value: "lorem", label: "Lorem ipsum dolor sit amet"},
  %{value: "duis", label: "Duis dictum gravida odio ac pharetra?"},
  %{value: "donec", label: "Donec condimentum ex mi"}
]
)}>
    <:label>Choose one</:label>
    <:item_control><.heroicon name="hero-check" class="data-checked" /></:item_control>
    <:error :let={msg}>
      <.heroicon name="hero-exclamation-circle" class="icon" />
      {msg}
    </:error>
  </.radio_group>
  <.action type="submit" class="button ui-accent">
    Submit
  </.action>
</.form>

  

    def radio_group_form_page(conn, _params) do
  phoenix_form =
    Phoenix.Component.to_form(%{"choice" => ""}, as: :radio_group_phoenix, id: "radio-group-form-phoenix")

  render(conn, :radio_group_form_page, phoenix_form: phoenix_form)
end

def radio_group_form_submit(conn, params) do
  if is_map(params["radio_group_phoenix"]) do
    choice = params["radio_group_phoenix"]["choice"] || ""

    conn
    |> put_flash(:info, "Submitted: choice=#{inspect(choice)}")
    |> redirect(to: ~p"/radio-group/form#radio-group-form-phoenix")
  end
end

  

    <.form
  for={@form}
  action="/account/choice"
  method="post"
  class="flex flex-col gap-space-lg w-full max-w-xl"
>
  <.radio_group
    field={@form[:choice]}
    class="radio-group"
    items={[
      %{value: "lorem", label: "Lorem ipsum dolor sit amet"},
      %{value: "duis", label: "Duis dictum gravida odio ac pharetra?"},
      %{value: "donec", label: "Donec condimentum ex mi"}
    ]}
  >
    <:label>Choose one</:label>
    <:item_control><.heroicon name="hero-check" class="data-checked" /></:item_control>
    <:error :let={msg}>
      <.heroicon name="hero-exclamation-circle" class="icon" />
      {msg}
    </:error>
  </.radio_group>

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

  

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

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

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

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

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

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

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

  

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

  embedded_schema do
    field :choice, :string
  end

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

  def changeset_validate(form, attrs \\ %{}) do
    form
    |> cast(attrs, [:choice])
    |> validate_required([:choice])
  end
end

  

    <form action={~p"/radio-group/form"} 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()} />
  <.radio_group
    name="user[choice]"
    class="radio-group"
    items={[
  %{value: "lorem", label: "Lorem ipsum dolor sit amet"},
  %{value: "duis", label: "Duis dictum gravida odio ac pharetra?"},
  %{value: "donec", label: "Donec condimentum ex mi"}
]
}
  >
    <:label>Choose one</:label>
    <:item_control><.heroicon name="hero-check" class="data-checked" /></:item_control>
  </.radio_group>
  <.action type="submit" class="button ui-accent">Submit</.action>
</form>

  

    def radio_group_form_submit(conn, %{"user" => %{"choice" => choice}}) do
  conn
  |> put_flash(:info, "Submitted: choice=#{inspect(choice)}")
  |> redirect(to: ~p"/radio-group/form#radio-group-form-native")
end