javascript - 如何将警报 float 放在导航栏上方？

Question

我希望 alert float 在导航栏上方，像这样

|    navbar        |alert|      navbar         |

可以解除警报

不是这个:

|                   alert                      |
|                   navbar                     |   

这是我的代码和jsfiddle :

<div class="alert-float" style=" position: absolute; top: 0; left: 30px; right: 30px; ">
  <div class="alert alert-success alert-dismissible" role="alert">
    <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
    Test alert text
  </div>
</div>
<nav class="navbar navbar-default navbar-static-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Project name</a>
    </div>
    <div id="navbar" class="navbar-collapse collapse">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li><a href="#about">About</a></li>
        <li><a href="#contact">Contact</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Action</a></li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li role="separator" class="divider"></li>
            <li class="dropdown-header">Nav header</li>
            <li><a href="#">Separated link</a></li>
            <li><a href="#">One more separated link</a></li>
          </ul>
        </li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="../navbar/">Default</a></li>
        <li class="active"><a href="./">Static top <span class="sr-only">(current)</span></a></li>
        <li><a href="../navbar-fixed-top/">Fixed top</a></li>
      </ul>
    </div><!--/.nav-collapse -->
  </div>
</nav>

Answer 1

如果你在alert样式中添加z-index: 9999，你可以用你现有的代码实现，

Updated Fiddle

<div class="alert-float" style=" position: absolute; top: 0; left: 130px; right: 30px; z-index: 9999;width: 65%">
  <div class="alert alert-success alert-dismissible" role="alert">
    <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
    Test alert text
  </div>
</div>

没有 z-index: 9999 的另一种方式如下。

Fiddle

你必须把alert放在container里面，也做了一些改变如下

<nav class="navbar navbar-default navbar-static-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Project name</a>
    </div>
    <div class="alert-float headeralert">
      <div class="alert alert-success alert-dismissible" role="alert">
        <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
    Test alert text
      </div>
    </div>
    <div id="navbar" class="navbar-collapse collapse">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li><a href="#about">About</a></li>
        <li><a href="#contact">Contact</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Action</a></li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li role="separator" class="divider"></li>
            <li class="dropdown-header">Nav header</li>
            <li><a href="#">Separated link</a></li>
            <li><a href="#">One more separated link</a></li>
          </ul>
        </li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="../navbar/">Default</a></li>
        <li class="active"><a href="./">Static top <span class="sr-only">(current)</span></a></li>
        <li><a href="../navbar-fixed-top/">Fixed top</a></li>
      </ul>
    </div><!--/.nav-collapse -->
  </div>
</nav>

和CSS

.headeralert{
    width: 50%;
    position: absolute;
    top: 0;
    left: 160px;
    right: 30px; 
}