Phoenix.LiveViewTest.render_change

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render_change(element, value \\ %{})

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Sends a form change event given by element and returns the rendered result.

The element is created with element/3 and must point to a single element on the page with a phx-change attribute in it. The event name given set on phx-change is then sent to the appropriate LiveView (or component if phx-target is set accordingly). All phx-value-* entries in the element are sent as values.

If you need to pass any extra values or metadata, such as the "_target" parameter, you can do so by giving a map under the value argument.

It returns the contents of the whole LiveView or an {:error, redirect} tuple.

Examples

{:ok, view, html} = live(conn, "/thermo")

assert view
       |> element("form")
       |> render_change(%{deg: 123}) =~ "123 exceeds limits"

# Passing metadata
{:ok, view, html} = live(conn, "/thermo")

assert view
       |> element("form")
       |> render_change(%{_target: ["deg"], deg: 123}) =~ "123 exceeds limits"

As with render_submit/2, hidden input field values can be provided like so:

refute view
      |> form("#term", user: %{name: "hello"})
      |> render_change(%{user: %{"hidden_field" => "example"}}) =~ "can't be blank"
Link to this function

render_change(view, event, value)

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Sends a form change event to the view and returns the rendered result.

It returns the contents of the whole LiveView or an {:error, redirect} tuple.

Examples

{:ok, view, html} = live(conn, "/thermo")
assert html =~ "The temp is: 30℉"
assert render_change(view, :validate, %{deg: 123}) =~ "123 exceeds limits"