Pass a variable from view to the layout's partial view
I am trying using a partial 开发者_Go百科to render the application's menu, capitalizing the 'tab' using CSS, based on a local variable (tab):
<%= link_to "employees", jobs_path, :class => (tab=="employees" ? "selected":"unselected") %>
<a class="unselected">jobs</a>
<%= link_to "tags", tags_path, :class => (tab=="tags" ? "selected":"unselected") %>
The partial is embedded in the the Application's layout:
<body>
...
<!-- tab variable needs to be set in the view, not the layout -->
<%= render :partial => "layouts/primary_menu", :locals => { :tab => "profiles" } %>
...
</body>
Unfortunately, I need to set the variable's value in the view, but the variable isn't available. Should I be using the :content_for symbol instead of :locals?
At some point, I may want to pass a model instance variable to the partial, so the solution needs to be flexible.
Is there a better approach?
I think there are multiple ways to handle this, here is one - not necessarily the best
<!-- layout -->
<body>
<%= yield(:tabs_navigation) %>
...
</body>
<!-- views -->
<%- tabs_navigation(render :partial => "layouts/primary_menu", :locals => { :tab => "profiles" }) %>
another way - use a member variable instead of locals (this is kinda like cheating - but effective)
<!-- layout -->
<body>
<%= render :partial => "layouts/primary_menu" %>
....
</body>
<!-- views -->
<%- @current_tab = "profiles" %>
now access the @current_tab directly in the primary_menu partial
Using content_for
<!-- layout -->
<body>
<%= yield(:tabs_navigation) %>
...
</body>
<!-- views -->
<%- content_for :tabs_navigation do -%>
<%= render :partial => "layouts/primary_menu", :locals => { :tab => "profiles" } %>
<%- end -%>
http://guides.rubyonrails.org/layouts_and_rendering.html#understanding-yield
I decided to make use of the link_to_unless_current UrlHelper:
<%= link_to_unless_current "enroll", enroll_path, :class => "unselected" do
link_to "enroll", enroll_path, :class => "selected"
end %>
加载中,请稍侯......
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