Bootstrap响应式多级导航菜单

Question

我为bootstrap编写了一个多级导航菜单。它在1200px及以上时效果很好。但是当屏幕尺寸低于1200px（我将1200px设置为breapoint）时，第一级下拉菜单会在点击时打开/关闭，但第二级下拉菜单在点击时不会打开。我希望这个二级下拉菜单在单击其父锚点时在1200以下的屏幕尺寸上打开。 例如，当服务＆gt;点击低于1200px屏幕尺寸的美容牙科，我想要＆＃39;。dropdown-menu＆＃39;在它里面（牙齿卫生，假牙等）出现/ toggleshow（再次点击隐藏）。 我怎样才能做到这一点？

这是HTML：

    <nav id="navbar" class="navbar navbar-default" role="navigation">
        <div class="container">
            <div class="navbar-inner">
              <div class="navbar-collapse collapse">
                <ul class="nav navbar-nav navbar-left">
                    <li><a href="#">Home</a></li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown">Services <i class="fa fa-angle-down"></i></a>
                            <ul class="dropdown-menu">
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Cosmetic Dentistry <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">General Dentistry <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Braces <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Implants <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item"><a href="#">Nervous Patients Care</a></li>
                             </ul>
                      </li>
                    <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Team <i class="fa fa-angle-down"></i></a>
                      <ul class="dropdown-menu">
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Cosmetic Dentistry <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">General Dentistry <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Braces <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Implants <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item"><a href="#">Nervous Patients Care</a></li>
                             </ul>
                    </li>
                    <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Offers/Fees <i class="fa fa-angle-down"></i></a>
                      <ul class="dropdown-menu">
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Cosmetic Dentistry <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">General Dentistry <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Braces <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Implants <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item"><a href="#">Nervous Patients Care</a></li>
                             </ul>
                    </li>
                    <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Patients <i class="fa fa-angle-down"></i></a>
                      <ul class="dropdown-menu">
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Cosmetic Dentistry <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">General Dentistry <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Braces <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item dropdown dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Implants <i class="fa fa-angle-right"></i></a>
                                    <ul class="dropdown-menu">
                                        <li class="menu-item"><a href="#">Dental Hygiene</a></li>
                                        <li class="menu-item"><a href="#">Crowns & Bridges</a></li>
                                        <li class="menu-item"><a href="#">Dentures</a></li>
                                    </ul>
                                </li>
                                <li class="menu-item"><a href="#">Nervous Patients Care</a></li>
                             </ul>
                    </li>
                    <li><a href="#">Blog</a></li>
                    <li><a href="#">Referrals</a></li>
                    <li><a href="#">Contact</a></li>
                </ul>
              </div>
          </div><!-- end navbar-inner -->
       </div><!-- end container -->
    </nav><!-- end navbar -->

CSS：

#navbar {
    clear: both;
    border-radius: 0;
    border: 0;
    margin: 0;
    background: #f9f9f9;
    height: auto;
}
#navbar li a {
    text-transform: uppercase;
    font-weight: 700;
    font-size: 14px;
    color: #575757;
    padding-top: 20px;
    padding-bottom: 20px;
}
#navbar li a:hover {
    color: #7bcfdc
}

.dropdown-menu {
    box-shadow: none;
    border-radius: 0;
    border: 0;
    width: 240px;
    padding: 0;
}
.dropdown-submenu {
    position:relative;
    border-radius: 0;
    padding: 0;
}
.dropdown-submenu>.dropdown-menu {
    top:0;
    left:100%;
    margin-top:-1px;
    margin-left:-1px;
}
.dropdown-submenu.pull-left {
    float:none;
}
.dropdown-submenu.pull-left>.dropdown-menu {
    left:-100%;
    margin-left:10px;
}

#navbar .navbar-nav li a i {
    margin-left: 5px;
}
#navbar .navbar-nav li li a{
    background: #eee;
    text-transform: none;
    padding-top: 11px;
    padding-bottom: 11px;
}
#navbar .navbar-nav li li {
    position: relative;
}
#navbar .navbar-nav li li i {
    position: absolute;
    right: 20px;
    top: 14px;
}
#navbar .navbar-nav li .dropdown-submenu .dropdown-menu a {
    background: #e5e5e5;
}
#navbar .navbar-nav li li a:hover,
#navbar .navbar-nav li .dropdown-submenu .dropdown-menu a:hover
{
    background: #ff4e4f;
    color: #FFF;
}



/*----- RESPONSIVE STYLES ------*/
@media screen and (max-width: 1199px) {
    #navbar .dropdown-menu {
        width: 100%;
        position: relative;
    }
}
@media screen and (max-width: 768px) {
    .header-top p {
        text-align: center;
    }
    .header-top a {
        margin: 10px auto 0 auto;
        clear: both;
        display: block;
    }
}
@media screen and (min-width: 1200px) {
    #navbar .dropdown:hover > .dropdown-menu {
        display: block;
    }
    .dropdown-submenu:hover>.dropdown-menu {
        display:block;
    }
}

我为此做了一个JSFiddle：
https://jsfiddle.net/Lefosx46/

Answer 1

我看了你的代码。有很多事情要发生，所以虽然我的答案应该有效，但可能会有更有效的方法。它至少可以指出你正确的方向。

似乎存在以下问题：

@media screen and (max-width: 1199px) {
    #navbar .dropdown-menu {
        width: 100%;
        position: relative;
    }
}

我删除了它并添加了：

@media screen and (max-width: 1199px) {
    .dropdown-submenu:hover .dropdown-menu {
      display: block;
    }
} 

你可以在这里看到一个小提琴：https://jsfiddle.net/t4rnz8dg/

如果我误解了你的问题，请道歉！