更改活动导航项的颜色 [英] Changing the color of active nav-item

问题描述

我在Bootstrap中设计了一个 navbar 。当 nav-item 的类设置为 active 时，我试图使它变成不同的颜色。

I have a navbar designed in Bootstrap. I am trying to make it a different color when the class of the nav-item is set to active.

但是我无法这样做。当我设置背景时，背景颜色正在改变，但是当我使用 color 时，颜色不会改变。请注意，我正在使用Bootstrap v4。

However I am not able to do so. When I set the background the background color is changing, but when I use color the color is not changing. Note that I'm using Bootstrap v4.

$(document).ready(function() {
  "use strict";

  $('ul.navbar-nav > li').click(function(e) {
    e.preventDefault();
    $('ul.navbar-nav > li').removeClass('active');
    $(this).addClass('active');
  });
});

.navbar-toggler:focus {
  outline: 0;
}
.navbar-nav > .active {
  color: aqua!important;  **// THIS DOES NOT WORK**
  background-color: chartreuse; **//THIS WORKS**
}
.nav-item > a:hover {
  color: aqua!important;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav class="navbar navbar-light animated fadeInLeft" style="background-color: #C0C0C0 ;">
  <button class="navbar-toggler navbar-toggler-left" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="#navbarNav" aria-expanded="false" aria-label="Toggle navigation"><span class="lines"></span><span class="lines"></span><span class="lines"></span>
  </button>
  <h1 class="navbar-brand mb-0 move-header ">NavBrand</h1>
  <div class="collapse animated fadeInLeft" id="navbarNav">
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Features</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Pricing</a>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
  </div>
</nav>

推荐答案

问题是因为 .nav-item> a：悬停比更具体.navbar-nav> 。主动。要解决此问题，请删除！important 运算符（因为您应该不惜一切代价避免它）并使您想要覆盖的规则更具体。

The issue is because the .nav-item > a:hover is more specific than .navbar-nav > .active. To fix this, remove the !important operator (as you should avoid it at all costs) and make the rule you want to override more specific.

.navbar-nav > .active > a {
  color: aqua;
  background-color: chartreuse;    
}
.nav-item > a:hover {
  color: aqua;
}

$(document).ready(function() {
  "use strict";

  $('ul.navbar-nav > li').click(function(e) {
    e.preventDefault();
    $('ul.navbar-nav > li').removeClass('active');
    $(this).addClass('active');
  });
});

.navbar-nav > .active > a {
  color: aqua;
  background-color: chartreuse;
}
.nav-item > a:hover {
  color: aqua;
}

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/css/bootstrap.css" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://npmcdn.com/tether@1.2.4/dist/js/tether.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"></script>

<ul class="navbar-nav">
  <li class="nav-item active">
    <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a> 
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Features</a> 
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Pricing</a> 
  </li>
  <li class="nav-item">
    <a class="nav-link disabled" href="#">Disabled</a> 
  </li>
</ul>

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