Controller Form

    <.form
  for={@form}
  action={~p"/angle-slider/form"}
  method="post"
  class="flex flex-col gap-space-lg w-full max-w-xl"
>
  <.angle_slider
    field={@form[:angle]}
    markers marker_values={[0, 90, 180, 270]}
    class="angle-slider"
  >
    <:label>Angle</:label>
    <:error :let={msg}>
      <.heroicon name="hero-exclamation-circle" class="icon" />
      {msg}
    </:error>
  </.angle_slider>
  <.action type="submit" class="button ui-accent">Submit</.action>
</.form>

  

    def angle_slider_form_page(conn, _params) do
  phoenix_form =
    Phoenix.Component.to_form(%{"angle" => "0"}, as: :angle_slider_phoenix, id: "angle-slider-form-phoenix")

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

def angle_slider_form_submit(conn, params) do
  if is_map(params["angle_slider_phoenix"]) do
    angle = params["angle_slider_phoenix"]["angle"] || ""

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

  

    <.form
  for={@form}
  action={~p"/angle-slider/form"}
  method="post"
  class="flex flex-col gap-space-lg w-full max-w-xl"
>
  <.angle_slider
    field={@form[:angle]}
    markers marker_values={[0, 90, 180, 270]}
    class="angle-slider"
  >
    <:label>Angle (0–90)</:label>
    <:error :let={msg}>
      <.heroicon name="hero-exclamation-circle" class="icon" />
      {msg}
    </:error>
  </.angle_slider>

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

  

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

  form =
    Phoenix.Component.to_form(changeset,
      as: :angle_slider_validated,
      id: "product-angle-validated-form"
    )

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

def product_form_validated_create(conn, %{"angle_slider_validated" => params}) do
  case MyApp.Forms.AngleSlider.changeset_validate(%MyApp.Forms.AngleSlider{}, params) do
    %Ecto.Changeset{valid?: true} = changeset ->
      data = Ecto.Changeset.apply_changes(changeset)
      conn
      |> put_flash(:info, "Saved angle=#{data.angle}")
      |> redirect(to: ~p"/products")

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

      form =
        Phoenix.Component.to_form(changeset,
          as: :angle_slider_validated,
          id: "product-angle-validated-form"
        )

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

  

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

  embedded_schema do
    field :angle, :float, default: 0.0
  end

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

  def changeset_validate(form, attrs \\ %{}) do
    form
    |> cast(attrs, [:angle])
    |> validate_required([:angle])
    |> validate_number(:angle,
      greater_than_or_equal_to: 0.0,
      less_than_or_equal_to: 90.0,
      message: "must be between 0 and 90"
    )
  end
end

  

    <form
  action={~p"/angle-slider/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()} />
  <.angle_slider
    name="angle_slider_form[angle]"
    value={0.0}
    markers marker_values={[0, 90, 180, 270]}
    class="angle-slider"
  >
    <:label>Angle</:label>
  </.angle_slider>
  <.action type="submit" class="button ui-accent">Submit</:action>
</form>

  

    def angle_slider_form_submit(conn, %{"angle_slider_form" => %{"angle" => angle}}) do
  conn
  |> put_flash(:info, "Submitted: angle=#{angle}")
  |> redirect(to: ~p"/angle-slider/form#angle-slider-form-native")
end