在引导程序中自动隐藏导航栏上方的警报

debugcn 发表于 Dev

维诺利

大家好，我正在尝试向您展示隐藏并钉在导航栏上方，我看到了，但是他的动画在隐藏时不起作用..有人可以帮我解决吗？

在小提琴上检查一下

// CSS

.margin-top-0 { margin-top: 0px !important; }
.margin-top-20 { margin-top: 20px !important; }
.margin-top-40 { margin-top: 40px !important; }
.alert-server {
  border-radius: 0;
  position:fixed;
  top:0;
  width:100%;
  padding:10px 0;
  text-align:center;
  display:none;
}

// 显示#notificationBar

setTimeout(function () {

    // working
    $("#notificationBar").css({"display":"block"});
    $('#notificationBar').html('Hello User! Welcome!').addClass('margin-top-0', 2000);
    $('body, .navbar').addClass('margin-top-40', 2000);

}, 2000);

// 隐藏#notificationBar

setTimeout(function () {

        // not working
        $('#notificationBar').removeClass('margin-top-0', 2000).html().css({"display":"none"});
        $('body, .navbar').removeClass('margin-top-40', 2000);

    }, 6000);

// HTML

<body>              
    <div id="notificationBar" class="alert alert-success alert-server" role="alert" style="display: none; overflow: hidden; z-index: 9999; margin-top: -40px;">
      <button type="button" class="close" data-dismiss="alert">×</button>
    </div>      

    <div class="navbar-spacer" style="min-height:60px;"></div>                  

     <!-- Fixed navbar -->
     <nav class="website-nav navbar navbar-default navbar-fixed-top">                    
        <div class="navbar-inner">
            <div class="nav-center">
            </div>
        </div>
     </nav>

约什本

这是一个基本的解决方案。

原版非固定.navbar版http://jsfiddle.net/joshmoto/vr4xto0a/1/

使用固定的导航栏，我不得不采取稍微不同的方法，通过在身体上添加类来显示警报以及动画导航栏位置并增加身体填充。

查看新.navbar.fixed-top版本http://jsfiddle.net/joshmoto/1a620ho8/

showAlert = function() {
  $('body').addClass('alert-show');
}

hideAlert = function() {
  $('body').removeClass('alert-show');
}

// auto show
setTimeout(function() {
  showAlert();
}, 1000);

// auto hide
setTimeout(function() {
  hideAlert();
}, 5000);

@import "http://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css";

BODY {
  min-height: 75rem;
  padding-top: 4.5rem;
  transition: padding .5s ease-in-out;
}

.navbar.fixed-top {
  transition: top .5s ease-in-out;
}

.alert {
  position: fixed;
  width: 100%;
  top: -50px;
  transition: top .5s ease-in-out;
}

BODY.alert-show {
  padding-top: calc(4.5rem + 50px);
}

BODY.alert-show .alert {
  top: 0;
}

BODY.alert-show .navbar.fixed-top {
  top: 50px;
}

<div class="alert alert-success mb-0 text-center" role="alert">
  I'm going to disapear in 5000ms
</div>

<nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark">
  <a class="navbar-brand" href="#">Fixed navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>
  <div class="collapse navbar-collapse" id="navbarCollapse">
    <ul class="navbar-nav mr-auto">
      <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 mt-2 mt-md-0">
      <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

<main role="main" class="container">
  <div class="jumbotron">
    <h1>Navbar example</h1>
    <p class="lead">This example is a quick exercise to illustrate how fixed to top navbar works. As you scroll, it will remain fixed to the top of your browser's viewport.</p>
    <a class="btn btn-lg btn-primary" href="../../components/navbar/" role="button">View navbar docs &raquo;</a>
  </div>
</main>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="http://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>

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