


Take you to understand the bootstrap drop-down menu in three minutes
This article will introduce you to the Bootstrap button drop-down menu. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.
Add .btn-group
to the button to trigger the menu as a button.
Single button drop-down menu
Make some changes in the button to use it as a drop-down menu.
<div class="btn-group"> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> 示例<span class="caret"></span> </button> <ul class="dropdown-menu"> <li><a href="#">列表1</a></li> <li><a href="#">列表2</a></li> <li role="separator" class="divider"></li> <li><a href="#">列表3</a></li> </ul> </div>
Split list drop-down menu
With single button drop-down menu Very similar, except the split version has one more button.
<div class="btn-group"> <button type="button" class="btn btn-danger">示例</button> <button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> <span class="caret"></span> <span class="sr-only">示例</span>//为了残障人士设计,不影响正常的阅读,屏幕阅读器能识别并阅读出来 </button> <ul class="dropdown-menu"> <li><a href="#">列表1</a></li> <li><a href="#">列表2</a></li> <li role="separator" class="divider"></li> <li><a href="#">列表3</a></li> </ul> </div>
Size
The drop-down menus all support size operations and support different sizes.
<div class="btn-group"> <button class="btn btn-default btn-lg dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> 大尺寸菜单<span class="caret"></span> </button> <ul class="dropdown-menu"> <li><a href="#">列表1</a></li> <li><a href="#">列表2</a></li> <li role="separator" class="divider"></li> <li><a href="#">列表3</a></li> </ul> </div> <div class="btn-group"> <button class="btn btn-default btn-sm dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> 中等尺寸菜单<span class="caret"></span> </button> <ul class="dropdown-menu"> <li><a href="#">列表1</a></li> <li><a href="#">列表2</a></li> <li role="separator" class="divider"></li> <li><a href="#">列表3</a></li> </ul> </div> <div class="btn-group"> <button class="btn btn-default btn-xs dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> 小尺寸菜单<span class="caret"></span> </button> <ul class="dropdown-menu"> <li><a href="#">列表1</a></li> <li><a href="#">列表2</a></li> <li role="separator" class="divider"></li> <li><a href="#">列表3</a></li> </ul> </div>
Recommended learning: Bootstrap video tutorial
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