引导4：多级下拉导航内幕

Question

什么是做一个多层次的下拉在引导4最简单的方法？我设法找到的所有的例子都是要么太乱或不包括在导航。

我试着只是放置一个下拉列表内的下拉列表中，但似乎并不像它的工作。有人可以帮我这个吗？

这里是我的代码的基本轮廓：

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>

<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
  <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <a class="navbar-brand" href="#">Navbar</a>
  <div class="collapse navbar-collapse" id="navbarNavDropdown">
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link 1</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown link
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
    </ul>
  </div>
</nav>

Answer 1

我用下面这段CSS和JavaScript的。它使用一个额外的类qazxsw POI。我引导4测试版进行了测试。

它支持多级子菜单。

dropdown-submenu

$('.dropdown-menu a.dropdown-toggle').on('click', function(e) {
  if (!$(this).next().hasClass('show')) {
    $(this).parents('.dropdown-menu').first().find('.show').removeClass('show');
  }
  var $subMenu = $(this).next('.dropdown-menu');
  $subMenu.toggleClass('show');


  $(this).parents('li.nav-item.dropdown.show').on('hidden.bs.dropdown', function(e) {
    $('.dropdown-submenu .show').removeClass('show');
  });


  return false;
});

.dropdown-submenu {
  position: relative;
}

.dropdown-submenu a::after {
  transform: rotate(-90deg);
  position: absolute;
  right: 6px;
  top: .8em;
}

.dropdown-submenu .dropdown-menu {
  top: 0;
  left: 100%;
  margin-left: .1rem;
  margin-right: .1rem;
}

Answer 2

更新2018

这里是一个多层次的下拉菜单上的引导4.1导航栏另一种变体。这其中使用最少的CSS的子菜单，可以被重新定位为期望的：

https://www.codeply.com/go/nG6iMAmI2X

jQuery来控制子菜单的显示：

.dropdown-submenu {
  position: relative;
}

.dropdown-submenu .dropdown-menu {
  top: 0;
  left: 100%;
  margin-top: -1px;
}

看到这个答案，用于激活$('.dropdown-submenu > a').on("click", function(e) { var submenu = $(this); $('.dropdown-submenu .dropdown-menu').removeClass('show'); submenu.next('.dropdown-menu').addClass('show'); e.stopPropagation(); }); $('.dropdown').on("hidden.bs.dropdown", function() { // hide any open menus when parent closes $('.dropdown-menu.show').removeClass('show'); });

Answer 3

我发现这个Bootstrap 4 submenus on hover这在所有设备工作的伟大。

此外，有multidrop-down menu

它支持与引导4多级子菜单。

hover style

$( document ).ready( function () {
    $( '.navbar a.dropdown-toggle' ).on( 'click', function ( e ) {
        var $el = $( this );
        var $parent = $( this ).offsetParent( ".dropdown-menu" );
        $( this ).parent( "li" ).toggleClass( 'show' );

        if ( !$parent.parent().hasClass( 'navbar-nav' ) ) {
            $el.next().css( { "top": $el[0].offsetTop, "left": $parent.outerWidth() - 4 } );
        }
        $( '.navbar-nav li.show' ).not( $( this ).parents( "li" ) ).removeClass( "show" );
        return false;
    } );
} );

.navbar-light .navbar-nav .nav-link {
    color: rgb(64, 64, 64);
}
.btco-menu li > a {
    padding: 10px 15px;
    color: #000;
}

.btco-menu .active a:focus,
.btco-menu li a:focus ,
.navbar > .show > a:focus{
    background: transparent;
    outline: 0;
}

.dropdown-menu .show > .dropdown-toggle::after{
    transform: rotate(-90deg);
}

Answer 4

以下是基于bootstrap4多层次的下拉菜单。它是根据bootstrap4基本下拉我试过了。

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">

<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>

<nav class="navbar navbar-toggleable-md navbar-light bg-faded btco-menu">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="#">Navbar</a>
    <div class="collapse navbar-collapse" id="navbarNavDropdown">
        <ul class="navbar-nav">
            <li class="nav-item active">
                <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Features</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Pricing</a>
            </li>
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="https://bootstrapthemes.co" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown link</a>
                <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                    <li><a class="dropdown-item" href="#">Action</a></li>
                    <li><a class="dropdown-item" href="#">Another action</a></li>
                    <li><a class="dropdown-item dropdown-toggle" href="#">Submenu</a>
                        <ul class="dropdown-menu">
                            <li><a class="dropdown-item" href="#">Submenu action</a></li>
                            <li><a class="dropdown-item" href="#">Another submenu action</a></li>

                            <li><a class="dropdown-item dropdown-toggle" href="#">Subsubmenu</a>
                                <ul class="dropdown-menu">
                                    <li><a class="dropdown-item" href="#">Subsubmenu action</a></li>
                                    <li><a class="dropdown-item" href="#">Another subsubmenu action</a></li>
                                </ul>
                            </li>
                            <li><a class="dropdown-item dropdown-toggle" href="#">Second subsubmenu</a>
                                <ul class="dropdown-menu">
                                    <li><a class="dropdown-item" href="#">Subsubmenu action</a></li>
                                    <li><a class="dropdown-item" href="#">Another subsubmenu action</a></li>
                                </ul>
                            </li>
                        </ul>
                    </li>
                </ul>
            </li>
        </ul>
    </div>
</nav>

.dropdown-submenu{
    position: relative;
}
.dropdown-submenu a::after{
    transform: rotate(-90deg);
    position: absolute;
    right: 3px;
    top: 40%;
}
.dropdown-submenu:hover .dropdown-menu, .dropdown-submenu:focus .dropdown-menu{
    display: flex;
    flex-direction: column;
    position: absolute !important;
    margin-top: -30px;
    left: 100%;
}
@media (max-width: 992px) {
    .dropdown-menu{
        width: 50%;
    }
    .dropdown-menu .dropdown-submenu{
        width: auto;
    }
}

引导4：多级下拉导航内幕

问题描述投票：39回答：4

4个回答

最新问题

引导4：多级下拉导航内幕

问题描述 投票：39回答：4

4个回答

最新问题

问题描述投票：39回答：4