Bootstrap 4：为什么在可滚动下拉列表中弹出窗口没有显示？ | 为什么在可滚动下拉列表中弹出窗口没有显示

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问题描述

我想让它像Bootstrap 3一样工作。当我在悬停弹出窗口上有滚动条的下拉列表时，我认为Bootstrap 4存在问题。我需要溢出：隐藏;制作下拉滚动，但也隐藏了弹出窗口。我试图使用容器：'body'但它没有用。

I want this to work just like Bootstrap 3. When I have a dropdown with scrollbar on hover popover, and I think there is a problem with Bootstrap 4. I need overflow:hidden; to make the dropdown scroll, but the popover is hidden too. I tried to use container:'body' but it didn't work.

$(document).ready(function() {
  $('[data-toggle="popover"]').popover({
    html: true,
    container: 'body'
  });
});

.dropdown-menu{
	height: 150px;
	overflow: hidden;
	overflow-y: auto
}

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap Example</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h2>Dropdowns</h2>

  <div class="dropdown">
    <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
      Dropdown button
    </button>
    <div class="dropdown-menu">
      <a class="dropdown-item" href="#"	title="Header" data-toggle="popover" data-placement="right" data-trigger="hover"data-content="Some content">Link 1</a></a>
      <a class="dropdown-item" href="#" title="Header" data-toggle="popover" data-placement="right" data-trigger="hover" data-content="Some content">Link 2</a>
      <a class="dropdown-item" href="#">Link 3</a>
      <a class="dropdown-item" href="#">Link 4</a>
      <a class="dropdown-item" href="#">Link 5</a>
      <a class="dropdown-item" href="#">Link 6</a>
      <a class="dropdown-item" href="#">Link 7</a>
      <a class="dropdown-item" href="#">Link 8</a>
      <a class="dropdown-item" href="#">Link 9</a>
    </div>
  </div>
</div>

推荐答案

popper.js ，以及它如何定位下拉列表，弹出窗口和工具提示。解决方案是将弹出窗口上的 数据边界 选项设置为窗口。。

There are some issues with popper.js, and how it positions dropdowns, popovers and tooltips. The solution is to set the data-boundary option on the popovers to window...

$(document).ready(function() {
  $('[data-toggle="popover"]').popover({
  });
});

.dropdown-menu{
	height: 150px;
	overflow: hidden;
	overflow-y: auto
}

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap Example</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
  <h2>Dropdowns</h2>
  <div class="dropdown">
    <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
      Dropdown button
    </button>
    <div class="dropdown-menu">
      <a class="dropdown-item" href="#"	title="Header" data-boundary="window" data-toggle="popover" data-placement="right" data-trigger="hover"data-content="Some content">Link 1</a></a>
      <a class="dropdown-item" href="#" title="Header" data-boundary="window" data-toggle="popover" data-placement="right" data-trigger="hover" data-content="Some content">Link 2</a>
      <a class="dropdown-item" href="#">Link 3</a>
      <a class="dropdown-item" href="#">Link 4</a>
      <a class="dropdown-item" href="#">Link 5</a>
      <a class="dropdown-item" href="#">Link 6</a>
      <a class="dropdown-item" href="#">Link 7</a>
      <a class="dropdown-item" href="#">Link 8</a>
      <a class="dropdown-item" href="#">Link 9</a>
    </div>
  </div>
</div>

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