当前阅读教程:Bootstrap4教程 > 指定向左边弹出的下拉菜单 | |
阅读(22555525) 收藏 赞(5685) 分享 | |
上一篇: 指定向上弹出的上拉菜单 | 下一篇: 按钮中设置下拉菜单 |
如果你希望下拉菜单向上弹出,可以在 div 元素上添加 "dropleft" 类: 实例 <!-- Default dropleft button --> <div class="btn-group dropleft"> <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Dropleft </button> <div> <!-- Dropdown menu links --> </div> </div> <!-- Split dropleft button --> <div> <div class="btn-group dropleft" role="group"> <button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> <span>Toggle Dropleft</span> </button> <div> <!-- Dropdown menu links --> </div> </div> <button type="button" class="btn btn-secondary"> Split dropleft </button> </div> 完整代码 <!DOCTYPE html> <html> <head> <title>Bootstrap 实例(小白教程网 2d5.net)</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <div style="text-align:center;"> <h2>下拉菜单</h2> <p> .dropleft 类用于设置下拉菜单向左弹出:</p><br> <!-- Default dropleft button --> <div class="btn-group dropleft"> <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Dropleft </button> <div> <!-- Dropdown menu links --> <a href="#">Action</a> <a href="#">Another action</a> <a href="#">Something else here</a> <div></div> <a href="#">Separated link</a> </div> </div> <br><br><br> <!-- Split dropleft button --> <div class="btn-group dropleft"> <button type="button" class="btn btn-secondary"> Split dropleft </button> <button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> <span>Toggle Dropleft</span> </button> <div> <!-- Dropdown menu links --> <a href="#">Action</a> <a href="#">Another action</a> <a href="#">Something else here</a> <div></div> <a href="#">Separated link</a> </div> </div> </div> </body> </html> 效果图 |
|
上一篇: 指定向上弹出的上拉菜单 | 下一篇: 按钮中设置下拉菜单 |