bootstrap 4 使警报出现在行的顶部

Question

我有一个警报 div 和容器内的一行，当我关闭警报时，行内容向上移动。我想让警报出现在行内容上，这样当我关闭它时什么也不会发生。

<div class="container"> 
    <div class="alert alert-success alert-dismissible fade show" role="alert">
            <strong>TEXT</strong>
            <button type="button" class="close" data-dismiss="alert" aria-label="Close">
            <span aria-hidden="true">&times;</span>
            </button>
        </div>

    <div class="row align-items-center">
        CONTENT
    </div>
</div>

提前致谢

Answer 1

一种方法是添加以下 CSS:

position:absolute !important;
top:0px;

警报 div。这是一个示例代码：

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h2>Alerts</h2>
  <div class="alert alert-success alert-dismissable" style="position: absolute; top:0px;">
    <a href="#" class="close" data-dismiss="alert" aria-label="close">×</a>
    <strong>Success!</strong> This alert box could indicate a successful or positive action.
  </div>
</div>

</body>
</html>

Answer 2

您可以尝试使用 jQuery 来更改警报的可见性而不是它的显示：

$('.alert').on('close.bs.alert', function (e) {
  e.preventDefault()
  $(this).css('visibility', 'hidden')
})

这是一个演示：
https://www.bootply.com/TazOvYZQyC

Answer 3

如果您将容器设置为 position: relative;

，Muhammad 的建议可能会奏效

.container {position: relative;}

.alert {position: absolute; top: 0;}

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>

<nav class="navbar">
  <div class="navbar-brand">Brand</div>
</nav>

<div class="container">
  <h2>Alerts</h2>
  <div class="alert alert-success alert-dismissable">
    <a href="#" class="close" data-dismiss="alert" aria-label="close">×</a>
    <strong>Success!</strong> This alert box could indicate a successful or positive action.
  </div>
</div>

</body>
</html>

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