问题
I tried this method (their fiddle) to enable scrollable menu with Bootstrap, but with that approach, the scrollable menu expands its container -- fiddle -- the non-scrollable menu, correctly, does not do this.
How can I fix this? Suggestions on other approaches compatible with Bootstrap are appreciated too!
For reference, here is the HTML from the first method\'s fiddle:
<ul class=\"nav\">
<li class=\"dropdown\">
<a class=\"icon-key icon-white\" data-toggle=\"dropdown\" href=\"#\" style=
\"font-weight: bold\"></a>
<div class=\"dropdown-menu\" style=\"margin-left: 2em\">
<ul class=\"dropdown-menu\">
<!-- static non-scrollable menu header 1 -->
</ul>
</div>
<div class=\"dropdown-menu\" style=\"margin-left: 2em\">
<ul class=\"dropdown-menu\">
<li class=\"disabled\">
<a href=\"#\"><i class=\"icon-group\"></i> <b>My Groups</b></a>
</li>
<li>
<div class=\"dropdown-menu scroll-menu scroll-menu-2x\"
style=\"margin-left: 2em\">
<ul class=\"dropdown-menu scroll-menu scroll-menu-2x\">
<li>
<a href=\"#\">User</a>
</li>
<li>
<a href=\"#\">Administrators</a>
</li>
<li>
<a href=\"#\">Some Other Group</a>
</li>
</ul>
</div>
<ul class=\"dropdown-menu scroll-menu scroll-menu-2x\">
<!-- Additional menu items omitted for brevity -->
</ul>
</li>
</ul>
</div>
<div class=\"dropdown-menu\" style=\"margin-left: 2em\">
<ul class=\"dropdown-menu\">
<!-- static non-scrollable menu header 2 -->
</ul>
</div>
<div class=\"dropdown-menu\" style=\"margin-left: 2em\">
<ul class=\"dropdown-menu\">
<li class=\"disabled\">
<a href=\"#\"><i class=\"icon-user\"></i> <b>My Roles</b></a>
</li>
<li>
<div class=\"dropdown-menu scroll-menu scroll-menu-2x\"
style=\"margin-left: 2em\">
<ul class=\"dropdown-menu scroll-menu scroll-menu-2x\">
<li>
<a href=\"#\">Core Users</a>
</li>
<li>
<a href=\"#\">Admin</a>
</li>
<li>
<a href=\"#\">Some Other Role</a>
</li>
</ul>
</div>
<ul class=\"dropdown-menu scroll-menu scroll-menu-2x\">
<!-- Additional menu items omitted for brevity -->
</ul>
</li>
</ul>
</div>
<div class=\"dropdown-menu\" style=\"margin-left: 2em\">
<ul class=\"dropdown-menu\">
<!-- static non-scrollable menu footer -->
</ul>
</div>
<ul class=\"dropdown-menu\">
<li class=\"disabled\">
<a href=\"#\"><i class=\"icon-chevron-up pull-left\"></i> <i class=\"icon-chevron-up pull-right\"></i></a>
</li>
</ul>
</li>
</ul>
And the CSS:
/* So we wont impact the original bootstrap menu or it\'s pseudo call-out
arrow the menu is wrapped in a sub dropdown-menu with a chained scroll-menu */
ul.scroll-menu {
position:relative;
display:inherit!important;
overflow-x:auto;
-webkit-overflow-scrolling:touch;
-moz-overflow-scrolling:touch;
-ms-overflow-scrolling:touch;
-o-overflow-scrolling:touch;
overflow-scrolling:touch;
top:0!important;
left:0!important;
width:100%;
height:auto;
max-height:500px;
margin:0;
border-left:none;
border-right:none;
-webkit-border-radius:0!important;
-moz-border-radius:0!important;
-ms-border-radius:0!important;
-o-border-radius:0!important;
border-radius:0!important;
-webkit-box-shadow:none;
-moz-box-shadow:none;
-ms-box-shadow:none;
-o-box-shadow:none;
box-shadow:none
}
回答1:
I think you can simplify this by just adding the necessary CSS properties to your special scrollable menu class..
CSS:
.scrollable-menu {
height: auto;
max-height: 200px;
overflow-x: hidden;
}
HTML
<ul class="dropdown-menu scrollable-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li><a href="#">Action</a></li>
..
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
</ul>
Working example: https://www.bootply.com/86116
Bootstrap 4
Another example for Bootstrap 4 using flexbox
回答2:
You can use the built-in CSS class pre-scrollable in bootstrap 3 inside the span element of the dropdown and it works immediately without implementing custom css.
<ul class="dropdown-menu pre-scrollable">
<li>item 1 </li>
<li>item 2 </li>
</ul>
回答3:
For CSS, I found that max height of 180 is better for mobile phones landscape 320 when showing browser chrome.
.scrollable-menu {
height: auto;
max-height: 180px;
overflow-x: hidden;
}
Also, to add visible scrollbars, this CSS should do the trick:
.scrollable-menu::-webkit-scrollbar {
-webkit-appearance: none;
width: 4px;
}
.scrollable-menu::-webkit-scrollbar-thumb {
border-radius: 3px;
background-color: lightgray;
-webkit-box-shadow: 0 0 1px rgba(255,255,255,.75);
}
The changes are reflected here: https://www.bootply.com/BhkCKFEELL
回答4:
Do everything in the inline of UL tag
<ul class="dropdown-menu scrollable-menu" role="menu" style="height: auto;max-height: 200px; overflow-x: hidden;">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li><a href="#">Action</a></li>
..
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
</ul>
回答5:
I just fix this problem in my project-
CSS code
.scroll-menu{
min-width: 220px;
max-height: 90vh;
overflow: auto;
}
HTML code
<ul class="dropdown-menu scroll-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li><a href="#">Action</a></li>
..
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
</ul>
回答6:
i hope this code is work well,try this.
add css file.
.scrollbar {
height: auto;
max-height: 180px;
overflow-x: hidden;
}
HTML code:
<div class="col-sm-2 scrollable-menu" role="menu">
<div>
<ul>
<li><a class="active" href="#home">Tutorials</a></li>
<li><a href="#news">News</a></li>
<li><a href="#contact">Contact</a></li>
<li><a href="#about">About</a></li>
<li><a href="#news">News</a></li>
<li><a href="#contact">Contact</a></li>
<li><a href="#about">About</a></li>
<li><a href="#news">News</a></li>
<li><a href="#contact">Contact</a></li>
<li><a href="#about">About</a></li>
<li><a href="#news">News</a></li>
<li><a href="#contact">Contact</a></li>
<li><a href="#about">About</a></li>
<li><a href="#news">News</a></li>
<li><a href="#contact">Contact</a></li>
<li><a href="#about">About</a></li>
</ul>
</div>
</div>
来源：https://stackoverflow.com/questions/19227496/scrollable-menu-with-bootstrap-menu-expanding-its-container-when-it-should-not