Question

我正在做一个像引导程序一样的水平菜单但我在菜单里面有一个问题我有一个下拉菜单。这是一个代码示例，因为您看到下拉列表打开超出正文的范围。我想如果不合适，那么它会向左开。我希望你能理解我。

HTML

<div class="navbar navbar-default" role="navigation">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
        </div>
        <div class="collapse navbar-collapse">
            <ul class="nav navbar-nav navbar-right">
                <li>
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Menu 1 <b class="caret"></b></a>
                    <ul class="dropdown-menu multi-level">
                        <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><a href="#">Separated link</a></li>
                        <li class="divider"></li>
                        <li><a href="#">One more separated link</a></li>
                        <li class="dropdown-submenu">
                            <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>
                            <ul class="dropdown-menu">
                                <li><a href="#">Action</a></li>
                                <li class="dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>
                                    <ul class="dropdown-menu">
                                        <li class="dropdown-submenu">
                                            <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>
                                            <ul class="dropdown-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><a href="#">Separated link</a></li>
                                                <li class="divider"></li>
                                                <li><a href="#">One more separated link</a></li>
                                            </ul>
                                        </li>
                                    </ul>
                                </li>
                            </ul>
                        </li>
                    </ul>
                </li>
                <li>
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Menu 2 <b class="caret"></b></a>
                    <ul class="dropdown-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><a href="#">Separated link</a></li>
                        <li class="divider"></li>
                        <li><a href="#">One more separated link</a></li>
                        <li class="dropdown-submenu">
                            <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>
                            <ul class="dropdown-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><a href="#">Separated link</a></li>
                                <li class="divider"></li>
                                <li class="dropdown-submenu">
                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>
                                    <ul class="dropdown-menu">
                                        <li class="dropdown-submenu">
                                            <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>
                                            <ul class="dropdown-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><a href="#">Separated link</a></li>
                                                <li class="divider"></li>
                                                <li><a href="#">One more separated link</a></li>
                                            </ul>
                                        </li>
                                    </ul>
                                </li>
                            </ul>
                        </li>
                    </ul>
                </li>
            </ul>
        </div>
</div>

CSS

.dropdown-submenu {
    position: relative;
}

.dropdown-submenu>.dropdown-menu {
    top: 0;
    left: 100%;
    margin-top: -6px;
    margin-left: -1px;
    -webkit-border-radius: 0 6px 6px 6px;
    -moz-border-radius: 0 6px 6px;
    border-radius: 0 6px 6px 6px;
}

.dropdown-submenu>a:after {
    display: block;
    content: " ";
    float: right;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
    border-width: 5px 0 5px 5px;
    border-left-color: #ccc;
    margin-top: 5px;
    margin-right: -10px;
}

.dropdown-submenu:hover>a:after {
    border-left-color: #fff;
}

.dropdown-submenu.pull-left {
    float: none;
}

.dropdown-submenu.pull-left>.dropdown-menu {
    left: -100%;
    margin-left: 10px;
    -webkit-border-radius: 6px 0 6px 6px;
    -moz-border-radius: 6px 0 6px 6px;
    border-radius: 6px 0 6px 6px;
}

JS

$(function(){
    $(".dropdown-submenu").on("click",function(e){
    var current=$(this).find(".dropdown-menu").first();
    console.log(current);
        current.toggle();
        e.stopPropagation();
    });


 $(document).click(function(){
   $(".dropdown-menu").hide('slow'); 
});


});

Answer 1

为此课程pull-left

添加此课程dropdown-submenu

<li class="dropdown-submenu  pull-left">

Answer 2

基于我对用户体验方面的理解。最佳做法是，如果菜单项与右侧对齐，则子菜单应与左侧对齐。可能像＆＃34; Lalji Tadhani＆＃34;建议。

Answer 3

试试这个，

$(function() {
  $(".dropdown-submenu").on("click", function(e) {
    var current = $(this).find(".dropdown-menu").first();
    current.toggle();
    if ($('body')[0].scrollWidth > $('body')[0].clientWidth) {
      $(this).find('.dropdown-menu').toggleClass('on-left');
    }
    console.log(current);
    e.stopPropagation();
  });
  $(document).click(function() {
    $(".dropdown-menu").hide('slow');
  });
});

和css，

.dropdown-menu.on-left{
      left: -100% !important;
    width: 100%;
}

上面的代码检查屏幕大小是否超过原始大小，如果是，则脚本将ac class on-left添加到下拉列表中。

<强>条件： $('body')[0].scrollWidth > $('body')[0].clientWidth

这是笔， https://codepen.io/lokesh_coder/pen/RRJqWN

谢谢！

引导菜单下拉列表问题

3 个答案: