Bootstrap单按钮的下拉菜单

简介

---

把任意一个按钮放入 .btn-group 中，然后加入适当的菜单标签，就可以让按钮作为菜单的触发器了。

插件依赖

按钮式下拉菜单依赖下拉菜单插件 ，因此需要将此插件包含在你所使用的 Bootstrap 版本中。

完整代码：

<!DOCTYPE HTML>
<html>
<head>
<link rel="stylesheet" href="/stylesheets/bootstrap.min.css">
<script src="/scripts/jquery.min.js"></script>
<script src="/scripts/bootstrap.min.js"></script>
</head>
<body>
<div class="btn-group"><button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
默认 <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="javascript:void(0)">功能</a></li>
<li><a href="javascript:void(0)">另一个功能</a></li>
<li><a href="javascript:void(0)">其他</a></li>
<li class="divider"></li>
<li><a href="javascript:void(0)">分离的链接</a></li>
</ul>
</div>
<div class="btn-group">
<button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
原始 <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="javascript:void(0)">功能</a></li>
<li><a href="javascript:void(0)">另一个功能</a></li>
<li><a href="javascript:void(0)">其他</a></li>
<li class="divider"></li>
<li><a href="javascript:void(0)">分离的链接</a></li>
</ul>
</div>
</body>
</html>

单按钮下拉菜单

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只要改变一些基本的标记，就能把按钮变成下拉菜单的开关。

1. <div class="btn-group">
2. <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-expanded="false">
3. Action <span class="caret"></span>
4. </button>
5. <ul class="dropdown-menu" role="menu">
6. <li><a href="#">Action</a></li>
7. <li><a href="#">Another action</a></li>
8. <li><a href="#">Something else here</a></li>
9. <li class="divider"></li>
10. <li><a href="#">Separated link</a></li>
11. </ul>
12. </div>

完整代码：

<!DOCTYPE HTML>
<html>
<head>
<link rel="stylesheet" href="/stylesheets/bootstrap.min.css">
<script src="/scripts/jquery.min.js"></script>
<script src="/scripts/bootstrap.min.js"></script>
</head>
<body>
<div class="btn-group">
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Default <span class="caret"></span></button>
<ul class="dropdown-menu" role="menu">
<li><a href="javascript:void(0);">Action</a></li>
<li><a href="javascript:void(0);">Another action</a></li>
<li><a href="javascript:void(0);">Something else here</a></li>
<li class="divider"></li>
<li><a href="javascript:void(0);">Separated link</a></li>
</ul>
</div>
</body>
</html>

分裂式按钮下拉菜单

---

相似地，分裂式按钮下拉菜单也需要同样的改变一些标记，但只是多一个分开的按钮。

1. <div class="btn-group">
2. <button type="button" class="btn btn-danger">Action</button>
3. <button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-expanded="false">
4. <span class="caret"></span>
5. <span class="sr-only">Toggle Dropdown</span>
6. </button>
7. <ul class="dropdown-menu" role="menu">
8. <li><a href="#">Action</a></li>
9. <li><a href="#">Another action</a></li>
10. <li><a href="#">Something else here</a></li>
11. <li class="divider"></li>
12. <li><a href="#">Separated link</a></li>
13. </ul>
14. </div>

完整代码：

<!DOCTYPE HTML>
<html>
<head>
<link rel="stylesheet" href="/stylesheets/bootstrap.min.css">
<script src="/scripts/jquery.min.js"></script>
<script src="/scripts/bootstrap.min.js"></script>
</head>
<body>
<div class="btn-group open">
<button type="button" class="btn btn-success">Success</button>
<button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown" aria-expanded="true">
<span class="caret"></span>
<span class="sr-only">Toggle Dropdown</span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="javascript:void(0);">Action</a></li>
<li><a href="javascript:void(0);">Another action</a></li>
<li><a href="javascript:void(0);">Something else here</a></li>
<li class="divider"></li>
<li><a href="javascript:void(0);">Separated link</a></li>
</ul>
</div>
</body>
</html>

尺寸

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按钮式下拉菜单适用所有尺寸的按钮。

1. <div class="btn-group">
2. <button class="btn btn-default btn-lg dropdown-toggle" type="button" data-toggle="dropdown" aria-expanded="false">
3. Large button <span class="caret"></span>
4. </button>
5. <ul class="dropdown-menu" role="menu">
6. ...
7. </ul>
8. </div>
9. <div class="btn-group">
10. <button class="btn btn-default btn-sm dropdown-toggle" type="button" data-toggle="dropdown" aria-expanded="false">
11. Small button <span class="caret"></span>
12. </button>
13. <ul class="dropdown-menu" role="menu">
14. ...
15. </ul>
16. </div>
17. <div class="btn-group">
18. <button class="btn btn-default btn-xs dropdown-toggle" type="button" data-toggle="dropdown" aria-expanded="false">
19. Extra small button <span class="caret"></span>
20. </button>
21. <ul class="dropdown-menu" role="menu">
22. ...
23. </ul>
24. </div>

完整代码：

<!DOCTYPE HTML>
<html>
<head>
<link rel="stylesheet" href="/stylesheets/bootstrap.min.css">
<script src="/scripts/jquery.min.js"></script>
<script src="/scripts/bootstrap.min.js"></script>
</head>
<body>
<div class="btn-group">
<button type="button" class="btn btn-default dropdown-toggle btn-lg" data-toggle="dropdown">默认 <span class="caret"></span></button>
<ul class="dropdown-menu" role="menu">
<li><a href="javascript:void(0);">功能</a></li>
<li><a href="javascript:void(0);">另一个功能</a></li>
<li><a href="javascript:void(0);">其他</a></li>
<li class="divider"></li>
<li><a href="javascript:void(0);">分离的链接</a></li>
</ul>
</div>
</body>
</html>

向上弹出式菜单

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给父元素添加 .dropup 类就能使触发的下拉菜单朝上方打开。

1. <div class="btn-group dropup">
2. <button type="button" class="btn btn-default">Dropup</button>
3. <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-expanded="false">
4. <span class="caret"></span>
5. <span class="sr-only">Toggle Dropdown</span>
6. </button>
7. <ul class="dropdown-menu" role="menu">
8. Dropdown menu links
9. </ul>
10. </div>

完整代码：

<!DOCTYPE HTML>
<html>
<head>
<link rel="stylesheet" href="/stylesheets/bootstrap.min.css">
<script src="/scripts/jquery.min.js"></script>
<script src="/scripts/bootstrap.min.js"></script>
</head>
<body>
<div class="btn-group dropup" style="margin-top:150px;margin-left:50px;">
<button type="button" class="btn btn-primary">Right dropup</button>
<button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-expanded="false">
<span class="caret"></span>
<span class="sr-only">Toggle Dropdown</span>
</button>
<ul class="dropdown-menu dropdown-menu-right" role="menu">
<li><a href="javascript:void(0)">Action</a></li>
<li><a href="javascript:void(0)">Another action</a></li>
<li><a href="javascript:void(0)">Something else here</a></li>
<li class="divider"></li>
<li><a href="javascript:void(0)">Separated link</a></li>
</ul>
</div>
</body>
</html>