Bootstrap 4折叠导航栏背景颜色

Question

我想在bootstrap 4 alpha v6中更改折叠导航栏的背景颜色.当然我想改变整个导航栏的背景颜色.

所以问题是任何负责导航栏崩溃的类？到目前为止我发现的唯一一个div是,#navbarSupportedContent但它只是导航栏中ul的内容(所以它不会改变整个导航栏的颜色).我可以检查jquery如果导航栏折叠然后更改背景颜色,但我想知道我是否可以在css中完成它.

除此之外,我想说导航栏的默认颜色是透明的,这就是为什么我想在折叠时改变它的颜色.

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我还有下一个问题是什么是BS4中负责导航栏切换器图标的类？我问,因为我想改变图标的​​颜色.我已经找到并尝试了以下内容:

.navbar-toggler-icon {
  color:white !important;
}

Answer 1

也适用于v4.

这是一个Bootstrap 4 alpha6 CSS演练,涵盖了对.navbar自身,内部链接和汉堡按钮的修改(所有!important这些都避免了应该只用作最后覆盖的手段):

/* change navbar background */
nav.navbar {
  background: transparent;
}
/* change navbar-brand color */
.navbar a.navbar-brand {
  color: white;
}
/* change navbar-brand color on hover */
.navbar a.navbar-brand:hover {
  color: green;
}
/*  change navbar li colors, also active one but not disabled one */
.navbar ul.navbar-nav li.nav-item a.nav-link {
  color: white;
}
/* change navbar-toggler inside lines color (stroke) */
.navbar-light span.navbar-toggler-icon {
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 32 32' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath stroke='yellow' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 8h24M4 16h24M4 24h24'/%3E%3C/svg%3E");
  color: white;
}
/* change hamburger button border color */
button.navbar-toggler.navbar-toggler-right {
  border-color: yellow;
}
/* change navbar background on collapse */
@media (max-width: 768px) {
  nav.navbar {
    background: lightgray;
  }
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.3.7/js/tether.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
<nav class="navbar navbar-toggleable-md navbar-light">
  <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <a class="navbar-brand" href="#">Navbar</a>
  <div class="collapse navbar-collapse" id="navbarTogglerDemo02">
    <ul class="navbar-nav mr-auto mt-2 mt-md-0">
      <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="#">Link</a>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="text" placeholder="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>