使用 jQuery 进行主动导航 - 无法将默认类应用于锚点 [英] Active navigation with jQuery - can't apply a default class to anchor

问题描述

我目前正在尝试制作一个 navigation-menu，其中 active-class 应用于 href 属性与当前 URL，因此我可以为该锚点设置样式，使其从菜单的其余部分中脱颖而出.

I am currently trying to make a navigation-menu where an active-class is applied to the anchors whose href attributes that match the current URL, so I can style that anchor in a way that makes it stand out from the rest of the menu.

这是我的标记:

<div id="sidebar">

  <h2>Navigation menu</h2>
  <h2 class="subnav"><a href="menu1/menu_item1">Menu item 1</a></h2>
  <h2 class="subnav"><a href="menu1/menu_item2">Menu item 2</a></h2>
  <h2 class="subnav"><a href="menu1/menu_item3">Menu item 3</a></h2>
  <h2 class="subnav"><a href="menu1/menu_item4">Menu item 4</a></h2>
  <h2 class="subnav"><a href="menu1/menu_item5">Menu item 5</a></h2>

</div> 

这是 jQuery:

   jQuery(function($) {

      // get the current url
      var path = location.pathname.substring(1); 

      // defining the top subnav anchor
      var $top_item = $('#sidebar h2:nth-child(2) a'); 

      // defining all subnav anchors
      var $all_items = $('#sidebar h2.subnav a'); 

      // defining the anchors with a href that matches the current url
      var $selected_item = $('#sidebar h2 a[@href$="' + path + '"]'); 

      // setting the selected menu item'class as active
      $selected_item.addClass('active'); 

      // THIS IS WHERE I THINK THE ERROR IS
      // if none of the h2.subnav's has a url that matches 
      // the current location then assume that it's the top one that's active:
      if ($all_items("href") !== path) $top_item.addClass('active');

  });

我正在使用 jQuery 应用活动类，只要锚点 href 和位置 url 之间存在匹配，它就可以正常工作.如果 url 不匹配任何锚，我希望将活动类应用于 $top_item.我的 jQuery 的那部分不起作用.

I am applying the active-class with jQuery, it works fine as long as there is a match between an anchors href and the location url. If the url don't match any of the anchors I want the active-class to be applied to the $top_item. That part of my jQuery doesn't work.

我看不出错误是什么，但我又有点像 Javascript/jQuery n00b.任何帮助将不胜感激.

I can't see what the error is, but then again I'm somewhat of a Javascript/jQuery n00b. Any help would be appreciated.

推荐答案

这应该是你想要的:标记匹配的链接，如果失败，标记你的默认链接.

function markActiveLink() {

    //Look through all the links in the sidebar
   $("div#sidebar a").filter(function() {

      //Take the current URL and split it into chunks at each slash
      var currentURL = window.location.toString().split("/");

      //return true if the bit after the last slash is the current page name
      return $(this).attr("href") == currentURL[currentURL.length-1];

    //when the filter function is done, you're left with the links that match.
    }).addClass("active");

   //Afterwards, look back through the links. If none of them were marked,
   //mark your default one.
   if($("div#sidebar a").hasClass("active") == false) {
      $("div#sidebar h2:nth-child(2) a").addClass("active");
    }
 }

markActiveLink();

另外，我在 jQuery Docs 网站上找到了一个关于这个 的官方教程 -滚动到底部以查看 jQuery 代码.它比我的更紧，虽然它不适合你的情况.

Also, I found an official tutorial on this on the jQuery Docs site - scroll to the bottom to see the jQuery code. It's tighter than mine, although it's not tailored to your situation.

这篇关于使用 jQuery 进行主动导航 - 无法将默认类应用于锚点的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！