Extending an existing layout in Rails
I have my main application layout, but then I have an /account section of my site which has exactly the same layout as the application layout markupwise, except the /account pages have an added sidebar in the content area of the layout.
Rather than blatantly copy the application layout and create a nearly redundant "account" layout, I'd like to extend the application layout, adding the sidebar in the content area.
So I have something like this in my application layout:
<html>
<body>
<div id="content">
<%= yield %>
</div>
</body>
</html>
and I want
<html>
<body>
<div id="content">
<div id="开发者_开发技巧sidebar"></div>
<%= yield %>
</div>
</body>
</html>
Is there a way to accomplish this without copying code?
You can have more than one yield in a layout, simply give the additional ones a name:
<html>
<body>
<div id="content">
<%= yield :sidebar %>
<%= yield %>
</div>
</body>
</html>
You can add HTML for that yield by using the content_for method
<% content_for :sidebar do -%>
<div id="sidebar"></div>
<% end -%>
But you'll have to add that to every view you want to have a sidebar. Instead, create views/layouts/application_with_sidebar.html.erb
<% content_for :sidebar do -%>
<div id="sidebar"></div>
<% end -%>
<%= render :file => 'layouts/application' %>
Further reading
If you'd prefer to keep the number of yields to a minimum, you can nest your layouts instead.
views/layouts/application.html.erb
<html>
<body>
<div id="content">
<%= yield(:with_sidebar) or yield %>
</div>
</body>
</html>
views/layouts/application_with_sidebar.html.erb
<% content_for :with_sidebar do -%>
<div id="sidebar"></div>
<% end -%>
<%= render :file => 'layouts/application' %>
controllers/accounts_controller.rb
class AccountsController < ApplicationController
layout 'application_with_sidebar'
...
end
Often you'll have the same situation for other parts of the site in which case it may make sense to use nested layouts.
http://guides.rubyonrails.org/v2.3.8/layouts_and_rendering.html#using-nested-layouts
If your /account route is bound to the account controller, you can always have a fullfeatured layout with conditional part like this
render :template => "/shared/sidebar" if controller.controller_name == "account"
(I have to admit that it does not please the eye though)
加载中,请稍侯......
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