CODEWITHSUNDEEP
elixirphoenix-framework
Matthew Lehner
Matthew Lehner

Reputation: 4027

Setting properties in parent view/template in Phoenix

I'd like to set the title tag in the application template, from a child view/controller in Phoenix.

The title tag is inside the web/templates/layout/app.html.eex template, but I have an ArticlesController which renders to the <%= @inner %> Coming from Rails I'd use the yield call, but can't find its equivalent in Phoenix.

What is the right way to pass properties up to the parent template/view from its child?

Upvotes: 11

Views: 1742

Answers (1)

Gazler
Gazler

Reputation: 84140

You have a couple of options here. I assume you want something like content_for in rails.

One option is to use render_existing/3 http://hexdocs.pm/phoenix/0.14.0/Phoenix.View.html#render_existing/3

Another flexible way is to use a plug:

defmodule MyApp.Plug.PageTitle do

  def init(default), do: default

  def call(conn, opts) do
    assign(conn, :page_title, Keyword.get(opts, :title)
  end

end

Then in your controller you can do

defmodule FooController do
  use MyApp.Web, :model
  plug MyApp.Plug.PageTitle, title: "Foo Title"
end

defmodule BarController do
  use MyApp.Web, :controller
  plug MyApp.Plug.PageTitle, title: "Bar Title"
end

And in your template;

<head>
  <title><%= assigns[:page_title] || "Default Title" %></title>
</head>

Here we use assigns instead of @page_title because @page_title will raise if the value is not set.

Upvotes: 12

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