Jade: Change active menu item in parent template

I have a navigation bar in my parent jade template and I'd like to highlight the item which is currently in view. So if I'm on the blog page,

ul
  li Home
  li.active Blog
  li Contact Us
  li About

Without copying the navigation bar structure into each child template, is there a way to have the parent template see what page it's extending and apply the active class accordingly?

parent.jade

doctype 5

html
  block link
    -var selected = 'home'; //default

  -var menu = { 'home': '/home', 'blog': '/blog', 'contact': '/contact' };

  body
    nav
      ul
        each val, key in menu
          li
            if selected === key
              a.selected(href=val, title=key)= key
            else
              a(href=val, title=key)= key

child.jade

extends parent

block link
  -var selected = 'blog';

Costa

Here's a simpler way:

Use this in your layout.jade (where nav is the name of the page that's active. nav = 'about' for example)

ul(class="#{nav}")
  li.home Home
  li.blog Blog
  li.contact Contact Us
  li.about About

Then put this is your CSS:

ul.home li.home,
ul.blog li.blog,
ul.contact li.contact,
ul.about li.about {
    color: red;
}

The only css rule that will apply is the one whose ul class exists. You'll need to pass in a variable nav that equals 'about', 'home', 'contact', or 'blog' depending on what page you're on.

Use the Current object with a ternary expression. All is in the documentation.

You can use the object properties to generate your active menu like so. If you want to use folders in your navigation menu (Jade version) :

ul(class="nav-menu")
            li: a(class="#{ current.path[0] === 'index' ? 'active' : '' }", href="/") home
            li: a(class="#{ current.path[0] === 'about' ? 'active' : '' }", href="/about/") about

Well, above solution is very clear but if someone is looking more controls over menus then there is a module available for node.js. Use this and you would have complete control over menus.

Use Case : When menus visibles based on roles

https://www.npmjs.com/package/active-menu

来源：https://stackoverflow.com/questions/15719660/jade-change-active-menu-item-in-parent-template

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pug