jquery - 重叠的导航下拉菜单无法使 z-index 正确

Question

我正在使用 Bootstrap，但我遇到了下拉菜单问题。我有一些 JS 会改变下拉菜单的位置，如果它要碰到窗口的边缘的话。它将它移动到父下拉列表的另一侧。问题是下拉菜单与根下拉菜单重叠并且 z-index 关闭。

我已经尝试调整所有我能想到的 z-index 但没有成功。有什么想法吗？

HTML:

<header>
    <div class="container-fluid container-nav">
            <div class="container container-wo-pad">
                <div class="header-home">                       
                    <div class="site-title">                                 
                        <a href="/"><img class="logo" src="">
                        <h1>Site</h1></a>                                
                    </div>                         
                </div>
                <!-- navigation object : U Navigation Items -->
                <div class="nav">
                    <div class="navControl">
                        <a class="nav-btn" href="#"><i class="fa fa-bars" aria-hidden="true"></i> Navigation</a>
                    </div>

                    <ul class="nav-root">
                        <li class="has-sub nav-root-item">
                            <a href="">LinkLinkLinkLink <span class="show-carrot">&#9662;</span> </a>
                            <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                            <ul class="dropdown sub-drop">
                                <li><a href="">Link</a></li>
                                <li class="has-sub">
                                    <a href="">Link <span class="show-carrot">&#9662;</span> </a>
                                    <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                                    <ul class="dropdown sub-drop">
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                    </ul>
                                </li>
                                <li class="has-sub">
                                    <a href="">Link <span class="show-carrot">&#9662;</span> </a>
                                    <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                                    <ul class="dropdown sub-drop">
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                    </ul>
                                </li>
                                <li><a href="">Link</a></li>   
                                <li><a href="">Link</a></li> 
                                <li class="has-sub">
                                    <a href="">Link <span class="show-carrot">&#9662;</span> </a>
                                    <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                                    <ul class="dropdown sub-drop">
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                    </ul>
                                </li>
                                <li class="has-sub">
                                    <a href="">Link <span class="show-carrot">&#9662;</span> </a>
                                    <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                                    <ul class="dropdown sub-drop">
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                    </ul>
                                </li>
                                <li class="has-sub">
                                  <a href="">Link <span class="show-carrot">&#9662;</span> </a>
                                  <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                                  <ul class="dropdown sub-drop">
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                    </ul>
                                </li>  
                                <li><a href="">Link</a></li>
                                <li><a href="" target="_blank">Link</a></li>                        
                            </ul>
                        </li>                    
                        <li class="has-sub nav-root-item">
                            <a href="">This one <span class="show-carrot">&#9662;</span> </a>
                            <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                            <ul class="dropdown sub-drop">
                                <li class="has-sub">
                                  <a href="">Then this one <span class="show-carrot">&#9662;</span> </a>
                                  <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                                  <ul class="dropdown sub-drop">
                                        <li><a href="">Link</a></li>
                                        <li class="has-sub">
                                          <a href="">Link <span class="show-carrot">&#9662;</span> </a>
                                          <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                                          <ul class="dropdown sub-drop">
                                            <li><a href="">Link </a></li>
                                            <li><a href="">Link</a></li>
                                            <li><a href="" target="_blank">Link</a></li>
                                          </ul>  
                                        </li>
                                        <li class="has-sub">
                                          <a href="">Last One <span class="show-carrot">&#9662;</span> </a>
                                          <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                                          <ul class="dropdown sub-drop">
                                            <li><a href="">LinkLinkLinkLinkLink</a></li>
                                            <li><a href="">Link</a></li>
                                          </ul>  
                                        </li>
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                        <li><a href="">Link</a></li>
                                    </ul>
                                  </li>
                                <li><a href="">Link Link Link Link</a></li>
                                <li><a href="">Link</a></li>
                                <li><a href="">Link</a></li>
                            </ul>
                        </li>                    
                        <li class="nav-root-item"><a href="">Link</a></li>
                        <li class="nav-root-item"><a href="">Link</a></li>                            
                        <li class="has-sub nav-root-item">
                            <a href="">Link <span class="show-carrot">&#9662;</span> </a>
                            <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                            <ul class="dropdown sub-drop">
                                <li><a href="">Sub link 1</a></li>
                                <li><a href="">Sub link 2</a></li>
                                <li><a href="">Sub link 3</a></li>
                                <li class="has-sub">
                                    <a href="">dropdown <span class="show-carrot">&#9662;</span> </a>
                                    <span class="open-icon"><i class="fa fa-plus open-close" aria-hidden="true"></i></span>
                                    <ul class="dropdown sub-drop">
                                        <li><a href="">Sub link 1</a></li>
                                        <li><a href="">Sub link 2</a></li>
                                        <li><a href="">Sub link 3</a></li>
                                        <li><a href="">Sub link 4</a></li>
                                    </ul>
                                </li>
                            </ul>
                        </li>
                    </ul>
                </div>
            </div>
        </div>        
    </header>

CSS:

.container-nav {
      background-color: #00bcd4;
      margin-top: -1px; /* compensate for when alert isn't there */
      padding-bottom: 10px;
    }

    .nav .navControl {
      display: none;    
      cursor: pointer;
      font-size: 16px;
      border: 1px solid rgba(0, 0, 0, 0.1);
      margin: 10px 0;
    }

    .open-icon {
      float: right;
      padding: 15px 20px;
    }

    .nav ul {
      list-style: none;
      margin-top: 0;
      margin-bottom: 0;
      padding: 0;
      border-top: 1px solid rgba(0, 0, 0, 0.1);
    }

    .nav li {
      /* margin-left: -4px; */
      display: block;    
      position: relative;    
      z-index: 1;
      font-size: 16px;
      border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    }

    .nav a {
      padding: 15px 20px;
      display: inline-block;    
      color: #fff;
      text-decoration: none;
      text-align: left;
    }

    .nav a:hover {
      color: #fff;
    }

    .nav-root li a {
      text-decoration: underline;
    }

    .nav .dropdown {
      text-align: left;
      width: 100%;
    }

    .nav .dropdown li {
      margin: 0;
      display: block;
    }

    .nav .dropdown a {
      padding: 15px 20px;
      border-right: 0;
      margin-right: 10px;
      text-shadow: 0px 1px 1px #b9afaf;
    }

    .nav .dropdown li:last-child a {
      margin-right: 0;
    }

    .has-sub .open-icon {
      border-left: 1px solid rgba(0, 0, 0, 0.1);
    }

    .sub-drop {
      display: none;
      background-color: #0097A7;
    }



    /* Custom, iPhone Retina */ 
    @media only screen and (min-width : 320px) {
      .site-title {
        width: 100%;
      }
      .site-title h1{
        font-size: 33px;
      }        
      .search {
        width: 100%
      }
    }

    /* Extra Small Devices, Phones */ 
    @media only screen and (min-width : 480px) {

    }
    @media all and (max-width: 600px) {
      .site-title {
        width: 100%;
        text-align: center;
      }
      .search {
        width: 100%
      }
      .nav .navControl {
        display: block;
      }

      .nav-root {
        display: none;
      }

      .show-carrot {
        display: none;
      }
    }

    @media all and (min-width: 600px) {
      .site-title {
        display: table-cell;
        width: 50%;
        vertical-align: middle;
      }
      .search {
        display: table-cell;
        width: 50%;
        vertical-align: middle;
      }
      .search-field {
        width: 50%;
      }
      .logo {
        width: 50px;
      }
      .home-container {
        margin-top: -34px;
      }

      .container-no-pad {
        width: 100%;
        margin: 0 auto;
      }
      .container-nav {
        height: 189px;
      }

      .nav {
        position: relative;
        z-index: 5;
        max-width: 1170px;
        margin: 0 auto;
      }
      .nav-root {
        padding-left: 0;
        display: block;
      }

      .nav-root li a {
        text-decoration: none;
        text-align: left;
      }

      .nav ul {
        border: 0;
        white-space: nowrap;
      }

      .nav li {
        /* margin-right: -4px; */
        display: inline-block;
        border: 0;
      }

      .nav a {
        width: 100%;
      }

      .nav a:hover {

      }

      .nav .dropdown {
        display: none;        
        background: #80DEEA;         
        position: absolute;
        top: 100%;
        left: 0;
        width: auto;
      }

      .nav .dropdown li {
          display: block;
      }

      .nav .dropdown a {
          margin-right: 0;        
          white-space: nowrap;
      }
      .nav .dropdown a:hover {
          background: #00bcd4;
      }

      .nav span {
        display: inline;        
        position: relative;
        left: 5px;
      }

      .nav a:hover + .dropdown,
      .nav .dropdown:hover {
        display: block;
      }

      /* desktop hover sub dropdown show */
      .nav a:hover + span + .dropdown {
        display: block;
      }

      .dropdown .dropdown {
        left: 100%;
        top: 0;
      }

      .sub-drop {
        display: block;
        box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
      }

      .open-icon {
        display: none !important;
      }
      .show-carrot {
        display: block;
      }
    }

    /*----------------------------------------------------------------------------------------------------------------*\
        NAV dropdown z-index
    \*----------------------------------------------------------------------------------------------------------------*/
    .dropdown {
      z-index: 1000;
    }

    .dropdown .dropdown {
      z-index: 2000;
    }

    .dropdown .dropdown .dropdown {
      z-index: 3000;
    }

    .dropdown li {
      z-index: 1001;
    }

    .dropdown .dropdown li {
      z-index: 2002;
    }

    .dropdown .dropdown .dropdown li {
      z-index: 3003;
    }

jQuery:

$(document).ready(function() {

    $('.dropdown').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 });    
    }
    });
});

Link to Fiddle

问题图片:

Answer 1

我觉得你那里有很多不必要的 css 样式，但主要是你缺少最后一个 ul 上的 z-index(我用类 newStyle 更新了它)。

https://jsfiddle.net/ctxp4f3u/4/

.newStyle {
   position: absolute;
   z-index: 3000;
}