css - 导航栏切换按钮打开，然后设置为在特定像素显示切换按钮时立即关闭

This question already has answers here:

Bootstrap 3 Navbar Collapse

(12个答案)


4年前关闭。




最近几天，我一直在学习bootstrap 3和sass。无论如何，我正在尝试使导航栏在屏幕尺寸低于1000px时折叠。它可以工作，但是当我单击切换按钮以显示菜单下拉菜单时，它会打开，然后立即关闭。
这是代码:http://jsbin.com/zahatekisa/edit?html,css,output

.navbar {
  background-color: #202C39;
}
div.navbar-header a.navbar-brand {
  font-family: "Caveat Brush";
  margin-right: 20px;
  font-size: 23px;
  color: #F29559;
}
div.navbar-header a.navbar-brand:hover {
  color: #ffb36b;
}
ul.nav.navbar-nav li a {
  font-family: "PT Sans", "cursive";
  color: #e6e6e6;
}
ul.nav.navbar-nav li a:hover {
  color: #ffffff;
  background-color: #2a394a;
}
ul.navbar-right li p.navbar-text {
  display: block;
}
@media (max-width: 1050px) {
  ul.navbar-right li a {
    float: left;
  }
  ul.navbar-right li p.navbar-text {
    margin-left: 15px;
    position: relative;
    top: -4px;
  }
}
@media (max-width: 1000px) {
  .navbar-header {
    float: none;
  }
  .navbar-toggle {
    display: block;
  }
  .navbar-collapse {
    border-top: 1px solid transparent;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  }
  .navbar-collapse.collapse {
    display: none !important;
  }
  .navbar-nav {
    float: none !important;
    margin: 7.5px -15px;
  }
  .navbar-nav > li {
    float: none;
  }
  .navbar-nav > li > a {
    padding-top: 10px;
    padding-bottom: 10px;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/>
<nav class="navbar navbar-default navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <!--Making the toggle button-->
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <!--Logo-->
      <a href="#" class="navbar-brand">Lorem ipsum dolor.</a>
    </div>

    <div class="collapse navbar-collapse" id="myNavbar">
      <ul class="nav navbar-nav">
        <li><a href="#">Lorem</a>
        </li>
        <li><a href="#">Lorem</a>
        </li>
        <li><a href="#">Lorem</a>
        </li>
        <li><a href="#">Lorem</a>
        </li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li>
          <p class="navbar-text">Contact Me:</p>
        </li>
        <li><a href="#"><i class="fa fa-facebook-official" aria-hidden="true"></i></a>
        </li>
        <li><a href="#"><i class="fa fa-twitter-square" aria-hidden="true"></i></a>
        </li>
        <li><a href="#"><i class="fa fa-skype" aria-hidden="true"></i></a>
        </li>
        <li><a href="#"><i class="fa fa-envelope" aria-hidden="true"></i></a>
        </li>
      </ul>
    </div>
  </div>
</nav>

最佳答案

这里的问题是您拥有的这种特殊样式，无论导航栏是打开还是关闭，这都迫使其被隐藏:

@media (max-width: 1000px) {
    .navbar-collapse.collapse {
        display: none !important;
    }
}

我可以在这里看到您的操作-您正在尝试将Bootstrap的.collapse类与您自己的自定义添加到导航栏上。但是，您的逻辑存在问题:我怀疑您是在Bootstrap切换.collapse来隐藏或显示折叠内容的前提下编写样式的。这是不正确的。实际上，Bootstrap为此切换了.in，因此，如果元素具有.in类，则不应隐藏内容。只需将选择器更改为:

@media (max-width: 1000px) {
    .navbar-collapse.collapse:not(.in) {
        display: none !important;
    }
}

这是上下文中的解决方法:

.navbar {
  background-color: #202C39;
}
div.navbar-header a.navbar-brand {
  font-family: "Caveat Brush";
  margin-right: 20px;
  font-size: 23px;
  color: #F29559;
}
div.navbar-header a.navbar-brand:hover {
  color: #ffb36b;
}
ul.nav.navbar-nav li a {
  font-family: "PT Sans", "cursive";
  color: #e6e6e6;
}
ul.nav.navbar-nav li a:hover {
  color: #ffffff;
  background-color: #2a394a;
}
ul.navbar-right li p.navbar-text {
  display: block;
}
@media (max-width: 1050px) {
  ul.navbar-right li a {
    float: left;
  }
  ul.navbar-right li p.navbar-text {
    margin-left: 15px;
    position: relative;
    top: -4px;
  }
}
@media (max-width: 1000px) {
  .navbar-header {
    float: none;
  }
  .navbar-toggle {
    display: block;
  }
  .navbar-collapse {
    border-top: 1px solid transparent;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  }
  .navbar-collapse.collapse:not(.in) {
    display: none !important;
  }
  .navbar-nav {
    float: none !important;
    margin: 7.5px -15px;
  }
  .navbar-nav > li {
    float: none;
  }
  .navbar-nav > li > a {
    padding-top: 10px;
    padding-bottom: 10px;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/>
<nav class="navbar navbar-default navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <!--Making the toggle button-->
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <!--Logo-->
      <a href="#" class="navbar-brand">Lorem ipsum dolor.</a>
    </div>

    <div class="collapse navbar-collapse" id="myNavbar">
      <ul class="nav navbar-nav">
        <li><a href="#">Lorem</a>
        </li>
        <li><a href="#">Lorem</a>
        </li>
        <li><a href="#">Lorem</a>
        </li>
        <li><a href="#">Lorem</a>
        </li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li>
          <p class="navbar-text">Contact Me:</p>
        </li>
        <li><a href="#"><i class="fa fa-facebook-official" aria-hidden="true"></i></a>
        </li>
        <li><a href="#"><i class="fa fa-twitter-square" aria-hidden="true"></i></a>
        </li>
        <li><a href="#"><i class="fa fa-skype" aria-hidden="true"></i></a>
        </li>
        <li><a href="#"><i class="fa fa-envelope" aria-hidden="true"></i></a>
        </li>
      </ul>
    </div>
  </div>
</nav>

(其他值得注意的是，您可能希望对媒体查询使用max-width: 768px而不是max-width: 1000px，因为这是“平板电脑”大小的设备的Bootstrap断点。)

关于css - 导航栏切换按钮打开，然后设置为在特定像素显示切换按钮时立即关闭，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/37839642/