elixir - 继承 Phoenix/Elixir 中的布局

Question

我需要为我的 Phoenix/Elixir 应用程序创建一个简单的布局层次结构，并从不同的布局继承我的模板。我知道如何为单个布局和多个模板做到这一点。但是我究竟如何才能从另一种布局继承一种布局？

比如说，层次结构是 layout1 -> layout2 -> layout3 和 template2(layout2), template3(layout3)。

在文档中没有提到这一点。

更新 :

基本布局就是基本布局——类似于 OOP 中的基类，它不知道它的子布局——有多少 ，如果有的话。因此，从基础调用“render children1”是没有意义的。

Answer 1

布局可以通过传递 layout 来嵌套键入 assigns调用渲染时:

<%= render @view_module, @view_template, Map.put(assigns, :layout, {MyApp.LayoutView, "nested.html"}) %>

这是 Phoenix.View.render/3 文档中的相关部分

Assigns

Assigns are meant to be user data that will be available in templates. However there are keys under assigns that are specially handled by Phoenix, they are:

• :layout - tells Phoenix to wrap the rendered result in the given layout. See next section.

The following assigns are reserved, and cannot be set directly:

• @view_module - The view module being rendered
• @view_template - The @view_module's template being rendered ## Layouts Templates can be rendered within other templates using the :layout option. :layout accepts a tuple of the form
  {LayoutModule, "template.extension"}.

To render the template within the layout, simply call render/3 using the @view_module and @view_template assign:

  <%= render @view_module, @view_template, assigns %>

对于 3 种布局，您可以执行以下操作:

# Controller
render(conn, "index.html", nested_1: "nested_1.html", nested_2: "nested_2.html")

# app.html.eex
<%= render @view_module, @view_template, Map.put(assigns, :layout, {MyApp.LayoutView, assigns.nested_1}) %>

# nested_1.html.eex
<%= render @view_module, @view_template, Map.put(assigns, :layout, {MyApp.LayoutView, assigns.nested_2}) %>

# nested_2.html.eex
<%= render @view_module, @view_template, assigns %>