jQuery解决方案，用于将Dropdown子菜单保留在屏幕内 [英] jQuery solution for keeping Dropdown submenu inside screen

问题描述

我在下拉菜单中使用了引导程序.但这有问题，

I am using bootstrap for my dropdown menu. But it has a problem,

如果我的"下拉菜单具有多级子菜单，则会在屏幕上显示出来，并显示底部滚动条.

If My dropdown menu have multilevel submenu then it shows off the screen, and bottom scroll bar appear.

如何将子菜单保留在屏幕内，我需要一个jQuery解决方案.

How do I keep my submenu inside the screen, I need a jQuery solution.

查看我的屏幕截图

这是游乐场:

http://jsfiddle.net/howtoplease/svLKN/

这是下拉HTML

<div class="navbar navbar-fixed-top">
  <div class="navbar-inner">
      <div class="container-fluid">
        <div class="nav-collapse">
          <ul class="nav">
            <li class="active"><a href="#">Home</a></li>
            <li><a href="#">Link</a></li>
            <li><a href="#">Link</a></li>
            <li><a href="#">Link</a></li>
            <li class="dropdown">
              <a data-toggle="dropdown" class="dropdown-toggle" href="#">Dropdown <b class="caret"></b></a>
              <ul class="dropdown-menu">
                <li>
                    <a href="#">2-level Dropdown <i class="icon-arrow-right"></i></a>
                    <ul class="dropdown-menu sub-menu">
                        <li><a href="#">Action</a></li>
                        <li><a href="#">Another action</a></li>
                        <li><a href="#">Something else here</a></li>
                        <li class="divider"></li>
                        <li class="nav-header">Nav header</li>
                        <li><a href="#">Separated link</a></li>
                        <li><a href="#">One more separated link</a></li>
                    </ul>
                </li>
                <li><a href="#">Another action</a></li>
                <li><a href="#">Something else here</a></li>
                <li class="divider"></li>
                <li class="nav-header">Nav header</li>
                <li><a href="#">Separated link</a></li>
                <li><a href="#">One more separated link</a></li>
              </ul>
            </li>
          </ul>         
        </div><!-- /.nav-collapse -->
      </div>
  </div>
</div>

推荐答案

如何解决此问题:它检查子菜单是否要溢出，并根据子菜单的宽度修改其位置，使其位于另一侧

How about this: It checks to see if the sub menu is going to overflow and modifies it's position by the width of the sub menu so it's on the other side

$('.sub-menu').parent().hover(function() {
    var menu = $(this).find("ul");
    var menupos = $(menu).offset();

    if (menupos.left + menu.width() > $(window).width()) {
        var newpos = -$(menu).width();
        menu.css({ left: newpos });    
    }
});

http://jsfiddle.net/svLKN/4/

这篇关于jQuery解决方案，用于将Dropdown子菜单保留在屏幕内的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！