侧边栏多级菜单的实现

侧边栏多级菜单的实现

本篇用html+css+jq实现侧边栏的菜单功能，可实现侧边以及菜单的展开隐藏效果。
一、HTML

<aside class="sidebar">
    <ul class="sidebar-menu">
        <li class="header text-center">
            <a href="#" class="sidebar-toggle">
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </a>
        </li>
        <li title="菜单一">
            <a href="#" class="open-tree">
                <img src="Images/common.png"/>
                <span>菜单一</span>
            </a>
            <ul class="treeview-menu menu-open">
                <li><a>菜单1</a></li>
                <li><a>菜单2</a></li>
                <li><a>菜单3</a></li>
                <li><a>菜单4</a></li>
            </ul>
        </li>
        <li title="菜单二">
            <a href="#" class="open-tree">
                <img src="Images/common.png"/>
                <span>菜单二</span>
            </a>
            <ul class="treeview-menu menu-open">
                <li><a>菜单1</a></li>
                <li><a>菜单2</a></li>
                <li><a>菜单3</a></li>
                <li><a>菜单4</a></li>
            </ul>
        </li>
        <li title="菜单三">
            <a href="#" class="open-tree">
                <img src="Images/common.png"/>
                <span>菜单三</span>
            </a>
            <ul class="treeview-menu menu-open">
                <li><a>菜单1</a></li>
                <li><a>菜单2</a></li>
                <li><a>菜单3</a></li>
                <li><a>菜单4</a></li>
            </ul>
        </li>
        <li title="菜单四">
            <a href="#" class="open-tree">
                <img src="Images/common.png"/>
                <span>菜单四</span>
            </a>
            <ul class="treeview-menu menu-open">
                <li><a>菜单1</a></li>
                <li><a>菜单2</a></li>
                <li><a>菜单3</a></li>
                <li><a>菜单4</a></li>
            </ul>
        </li>
        <li title="菜单五">
            <a href="#" class="open-tree">
                <img src="Images/common.png"/>
                <span>菜单五</span>
            </a>
            <ul class="treeview-menu menu-open">
                <li><a>菜单1</a></li>
                <li><a>菜单2</a></li>
                <li><a>菜单3</a></li>
                <li><a>菜单4</a></li>
            </ul>
        </li>
    </ul>
</aside>

二、CSS

ul,li,a{
    font-style: normal;
    list-style: none;
    color: #fff;
    margin: 0;
    padding: 0;
}
a{
    cursor: pointer;
}
.sidebar{
    width: 240px;
    background: #414550;
    position: fixed;
    top:0;
    left:0;
    z-index: 99;
}
.sidebar-menu li{
    position: relative;
}
.header{
    background: #4D5460;
    color: #fff;
}
.text-center{
    text-align: center;
}
.sidebar-toggle {
    display: inline-block;
    height: 100%;
    width: 45px;
    padding: 10px 15px;
}
.icon-bar {
    display: block;
    height: 2px;
    width: 15px;
    background: #fff;
    margin-top: 3px;
}
.sidebar-menu>li:not(.header) {
    border-bottom: 1px solid #3F434D;
    background: #393C42;
}
.sidebar-menu>li:not(.header)>a {
    display: inline-block;
    padding: 15px;
    color: #b8c7ce;
    width: 100%;
    border-left: 3px solid transparent;
    text-decoration: none;
}

.treeview-menu{
    display: none;
}
.sidebar-menu .treeview-menu {
    background: #576071;
}
.treeview-menu>li.active {
    background: #656f86;
    border-left: 3px solid #ccc;
}
.treeview-menu>li {
    padding: 8px 0;
    border-bottom: 0.8px solid #42495d;
    -webkit-transition: all 0.4s ease;
    -moz-transition: all 0.4s ease;
    -o-transition: all 0.4s ease;
    -ms-transition: all 0.4s ease;
}
.treeview-menu a {
    padding: 4px 3px 0 40px;
    color: #8aa4af;
    text-decoration: none;
}
.treeview-menu a.active {
    color: #E9EBEB;
    padding-bottom: 6px;
}
.treeview-menu a.active {
    color: #E9EBEB;
}
.hideTreeView{
    position: absolute;
    top: 0;
    width: 180px;
    left: 60px;
}
.open-tree-height{
    height:41px;
}
.treeview-menu-open{
    position:absolute;
    top:12px;
    right:20px;
    transform: rotate(90deg);
    width:12px;
}
.sidebar-menu>li:not(.header):hover{
    background-color: #24AA7A;
}

三 、Jq代码

$(function () {
    //点击顶部按钮
   $(".sidebar-toggle").click(function () {
      if($(".sidebar-menu li:not(:first-child)>a>span").css("display")=="none"){
          $(this).removeClass("active");
          $(".sidebar").css("width","240px");
          $(".treeview-menu>.active").parent().show(100);
          $(".sidebar-menu>li").removeClass("open-tree-height");
          $(".sidebar-menu li>.treeview-menu").removeClass("hideTreeView");
          $(".sidebar-menu li>a>span").show();
      }else{
          $(this).addClass("active");
          $(".sidebar").css({"width": "60px"});
          $(".open-tree>span").hide();
          $(".sidebar-menu>li").addClass("open-tree-height");
          $(".sidebar-menu li>.treeview-menu").hide().addClass("hideTreeView");
      }
   });
   //侧边栏效果
    $(".open-tree").click(function () {
        if ($(".sidebar-menu  .treeview-menu").css("display") == "none") {
            $('.sidebar-menu  .treeview-menu-open').removeClass("active");
            $('.sidebar-menu  .treeview-menu li').removeClass("active");
            $('.sidebar-menu  .treeview-menu li a').removeClass("active");
        }
        if ($(this).siblings(".treeview-menu").css("display") == "block") {
            $(this).siblings(".treeview-menu").slideUp(300).siblings(".treeview-menu-open").removeClass("active");
        } else {
            $(this).siblings(".treeview-menu").slideDown(300).siblings(".treeview-menu-open").addClass("active");

        }
        $(this).parent().siblings().find(".treeview-menu").slideUp(300).siblings(".treeview-menu-open").removeClass("active");
    });
    //添加选中样式
    $(".sidebar").on("click", ".treeview-menu li", function () {
        $(this).addClass("active").siblings(".active").removeClass("active");
        $(this).parent().parent().siblings().find(".active").removeClass("active");
        $(this).find("a").addClass("active").parent().siblings().find(".active").removeClass("active");
    });
    if ($(".open-tree>span").css("display") == "none"){
        $('.menu-open').css("display","none");
        $(".sidebar-menu>li").addClass("open-tree-height");
        $(".sidebar-menu li>.treeview-menu").hide().addClass("hideTreeView");
    }
});

四、效果图
（1）展开装填

（2）折叠状态