Dsl

Dsl is a DSL for writing HTML using Elixir.

You're probably here because you want to use Dsl to write Phoenix templates, which is why Dsl includes a Phoenix template engine and Dsl-compatible Phoenix form helpers.

Installation

If available in Hex, the package can be installed by adding dsl to your list of dependencies in mix.exs:

def deps do
  [
    {:dsl, "~> 0.1.0"}
  ]
end

Usage

use Dsl

htm do
  h2 "todos"

  ul class: "list" do
    for item <- @items do
      li class: "item" do
        div class: "checkbox" do
          div class: "bullet hidden"
        end

        div item
      end
    end
  end

  script """
  function toggleCheck({currentTarget}) {
    currentTarget.children[0].children[0].classList.toggle("hidden");
  }

  let items = document.querySelectorAll("li");

  Array.from(items).forEach(checkbox => checkbox.addEventListener("click", toggleCheck));
  """
end

Components

Dsl provides an API for creating custom components that act as custom HTML elements.

These components can be given props that are available inside the component definition as module attributes. The contents of a components do block are available as a special @children attribute.

defcomponent :flex do
  div id: @id, class: "flex" do
    @children
  end
end

htm do
  flex id: "my-flex" do
    div "Item 1"
    div "Item 2"
    div "Item 3"
  end
end

Phoenix.HTML

Dsl provides macros for working with the helpers provided by the Phoenix.HTML package.

Most of the macros are purely wrappers, while the semantics of some are changed to work with Dsl.

htm do
  form_for @conn, Routes.some_path(@conn, :create) do
    text_input form, :name
  end
end

Phoenix templates

Add the templating engine to your Phoenix configuration.

# config.exs
config :phoenix, :template_engines, exs: Dsl.Engine

# your_app_web.ex
def view do
  quote do
    # ...
    use Dsl # Replaces the call to import Phoenix.HTML
  end
end

# app.html.exs
html lang: "en" do
  head do
    meta charset: "utf-8"
    meta http_equiv: "X-UA-Compatible", content: "IE=edge"
    meta name: "viewport", content: "width=device-width, initial-scale=1.0"
    title "YourApp · Phoenix Framework"

    link rel: "stylesheet", href: Routes.static_path(@conn, "/css/app.css")
  end

  body do
    header do
      section class: "container" do
        nav role: "navigation" do
          ul do
            li do: a("Get Started", href: "https://hexdocs.pm/phoenix/overview.html")
          end
        end

        a href: "http://phoenixframework.org/", class: "phx-logo" do
          img src: Routes.static_path(@conn, "/images/phoenix.png"),
              alt: "Phoenix Framework Logo"
        end
      end
    end

    main role: "main", class: "container" do
      p get_flash(@conn, :info), class: "alert alert-info", role: "alert"
      p get_flash(@conn, :error), class: "alert alert-danger", role: "alert"

      partial render(@view_module, @view_template, assigns)
    end

    script type: "text/javascript", src: Routes.static_path(@conn, "/js/app.js")
  end
end