如何使用此CSS使子菜單與其父菜單處於同一水平線？

Question

 * { margin: 0; padding: 0; } body { font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; } a { text-decoration: none; font-size: 11px; font-weight: 100; width: 100%; box-sizing: border-box; } ul { list-style: none; } /* LEVEL ONE : MAIN MENU */ ul.dropdown { position: relative; } ul.dropdown li.menuppal { float: left; zoom: 1; background: #B2DAFB repeat-x top left; -moz-border-radius: 5px; -webkit-border-radius: 5px; border-left: 1px solid #222; } ul.dropdown li.menuppal a { display: block; padding: 4px 8px; color: #000000; } /* Doesn't work in IE */ ul.dropdown li.menuppal:hover { background: #ccc url('../images/menuDark.png') repeat-x 50% 50%; position: relative; } /* FIN LEVEL ONE */ /* LEVEL TWO */ ul.dropdown ul { width: 220px; visibility: hidden; position: absolute; top: 100%; left: 0; background-color: #40617C; } ul.dropdown ul li { float: none; } /* IE 6 & 7 Needs Inline Block */ ul.dropdown li.menuppal ul li a { border-right: none; color: #FFF; display: inline-block; } ul.dropdown li.menuppal ul li a:hover { background: #07243a; } ul.dropdown li.menuppal ul li a:visited { word-break: break-all; } /* LEVEL THREE */ ul.dropdown ul ul { left: 100%; } ul.dropdown li:hover > ul { visibility: visible; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <script src="https://iscriptdesign.googlecode.com/svn-history/r2/trunk/js/jquery.dropdownPlain.js"></script> <div> <ul class="dropdown"> <li class="menuppal"><a href="#">Administration</a> <ul> <li><a href="#">Artificial Turf</a> </li> <li> <a href="#">Batting Cages</a> <ul> <li><a href="#">Indoor</a> </li> <li><a href="#">Outdoor</a> </li> </ul> </li> <li><a href="#">Benches &amp; Bleachers</a> </li> <li><a href="#">Communication Devices</a> </li> <li><a href="#">Dugouts</a> </li> <li><a href="#">Fencing &amp; Windscreen</a> </li> <li><a href="#">Floor Protectors</a> </li> <li><a href="#">Foul Poles</a> </li> <li><a href="#">Netting</a> </li> <li><a href="#">Outdoor Furniture</a> </li> <li><a href="#">Outdoor Signs</a> </li> <li><a href="#">Padding</a> </li> <li><a href="#">Scoreboards</a> </li> <li><a href="#">Shade Structures</a> </li> <li><a href="#"> - VIEW ALL - </a> </li> </ul> </li> <li class="menuppal"><a href="#">Structure</a> <ul> <li><a href="#">All-in-One Team Cart</a> </li> <li><a href="#">Air &amp; Electrical Reels</a> </li> <li><a href="#">Field Drags</a> </li> <li> <a href="#">Field Marking Equipment</a> <ul> <li><a href="#">Batter's Box Templates</a> </li> <li><a href="#">Dryline Markers</a> </li> <li><a href="#">Field Paint</a> </li> <li><a href="#">Field Sprayers</a> </li> <li><a href="#">Stencils</a> </li> </ul> </li> <li> <a href="#">Field Tarps</a> <ul> <li><a href="#">Area Tarps</a> </li> <li><a href="#">Growth Covers / Protectors</a> </li> <li><a href="#">Infield Tarps</a> </li> <li><a href="#">Tarp Accessories</a> </li> </ul> </li> <li><a href="#">Hand Tools</a> </li> <li> <a href="#">Irrigation, Hoses, Nozzles</a> <ul> <li><a href="#">Hoses &amp; Hose Reels</a> </li> <li><a href="#">Irrigation</a> </li> <li><a href="#">Nozzles</a> </li> </ul> </li> <li><a href="#">Layout Tools</a> </li> <li><a href="#">Moisture Removal</a> </li> <li><a href="#">Mound Fortification</a> </li> <li><a href="#">Mowers &amp; Stripers</a> </li> <li><a href="#">Soil Management</a> </li> <li><a href="#">Soil Amendments</a> </li> <li><a href="#">Spreaders &amp; Sweepers</a> </li> <li><a href="#"> - VIEW ALL - </a> </li> </ul> </li> <li class="menuppal"><a href="#">Exercice</a> <ul> <li> <a href="#">Baseball - Softball</a> <ul> <li><a href="#">Base Accessories</a> </li> <li><a href="#">Bases &amp; Home Plates</a> </li> <li><a href="#">Game Accessories</a> </li> <li><a href="#">Pitching Rubbers</a> </li> </ul> </li> <li> <a href="#">Batting Practice Equipment</a> <ul> <li><a href="#">Backstops</a> </li> <li><a href="#">Infield Screens</a> </li> <li><a href="#">Jugs Pitching Machines</a> </li> <li><a href="#">Turf Mats</a> </li> <li><a href="#">Turf Protectors</a> </li> <li><a href="#">Replacement Accessories</a> </li> </ul> </li> <li> <a href="#">Batting Cages</a> <ul> <li><a href="#">Indoor</a> </li> <li><a href="#">Outdoor</a> </li> </ul> </li> <li> <a href="#">Portable Mounds</a> <ul> <li><a href="#">Batting Practice Mounds</a> </li> <li><a href="#">Game Mounds</a> </li> <li><a href="#">Practice Mounds</a> </li> </ul> </li> <li> <a href="#">Football</a> <ul> <li><a href="#">First Down Markers</a> </li> <li><a href="#">Football Accessories</a> </li> <li><a href="#">Football Goalposts</a> </li> </ul> </li> <li> <a href="#">Soccer</a> <ul> <li><a href="#">Soccer Goals</a> </li> <li><a href="#">Soccer Accessories</a> </li> </ul> </li> <li><a href="#"> - VIEW ALL - </a> </li> </ul> </li> <li class="menuppal"><a href="#">Contribuables et biens</a> <ul> <li><a href="#">Ladders &amp; Sticks</a> </li> <li><a href="#">Hurdles</a> </li> <li><a href="#">Training Accessories</a> </li> <li><a href="#">Smart-Cart Training System</a> </li> <li><a href="#">Smart-Hurdle Collection</a> </li> <li><a href="#"> - VIEW ALL - </a> </li> </ul> </li> <li class="menuppal"><a href="#">Recettes</a> <ul> <li><a href="#">Field Design</a> </li> <li><a href="#">Turf Management</a> </li> <li><a href="#">Training</a> </li> <li><a href="#"> - VIEW ALL - </a> </li> </ul> </li> <li class="menuppal"><a href="#">Edition</a> <ul> <li><a href="#">Field Design</a> </li> <li><a href="#">Turf Management</a> </li> <li><a href="#">Training</a> </li> <li><a href="#"> - VIEW ALL - </a> </li> </ul> </li> <li class="menuppal"><a href="#">Outils</a> <ul> <li><a href="#">Field Design</a> </li> <li><a href="#">Turf Management</a> </li> <li><a href="#">Training</a> </li> <li><a href="#"> - VIEW ALL - </a> </li> </ul> </li> </ul> </div> 

我想做一個下拉菜單：

在運行時，子菜單與其父級不在同一水平位置：

那么如何解決呢？

Answer 1

找到這些選擇器並在其中添加此CSS屬性，然后它將在其父鏈接前面打開每個子菜單。

    ul.dropdown ul li {position:relative}
    ul.dropdown ul {top:0}
   .dropdown>li>ul {top: 20px;}

Answer 2

復制以下CSS：

* {
    margin: 0;
    padding: 0;
}

body {
    font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
}

a {
    text-decoration: none;
    font-size: 11px;
    font-weight: 100;
    width: 100%;
    box-sizing: border-box;
}

ul {
    list-style: none;
}

/*
 LEVEL ONE : MAIN MENU
 */
ul.dropdown {
    position: relative;
}

ul.dropdown li.menuppal {
    float: left;
    zoom: 1;
    background: #000 url(../images/menuLight.png) repeat-x top left;
    -moz-border-radius: 5px;
    -webkit-border-radius: 5px;
    border-left: 1px solid #222;
}

ul.dropdown li.menuppal a {
    display: block;
    padding: 4px 8px;
    color: #000000;
}

/* Doesn't work in IE */
ul.dropdown li.menuppal:hover {
    background: #ccc url('../images/menuDark.png') repeat-x 50% 50%;
    position: relative;
}
/*
        FIN LEVEL ONE
 */

/*
 LEVEL TWO
 */
ul.dropdown ul {
    width: 220px;
    visibility: hidden;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #40617C;
}





ul.dropdown ul li {
    float: none;
    position: relative;
}

/* IE 6 & 7 Needs Inline Block */
ul.dropdown li.menuppal ul li a {
    border-right: none;
    color: #FFF;
    display: inline-block;
}

ul.dropdown  li.menuppal ul li a:hover {
    background: #07243a;
}

ul.dropdown  li.menuppal ul li a:visited {
    word-break: break-all;
}

/*
 LEVEL THREE
 */
ul.dropdown ul ul {
    left: 100%;
    top:0!important
}

ul.dropdown li:hover > ul {
    visibility: visible;


}

Answer 3

您可以嘗試此鏈接 。 這里的開發人員說這可能會導致問題，但是當我嘗試時卻沒有

#primary_nav_wrap
{
    margin-top:15px
}

#primary_nav_wrap ul
{
    list-style:none;
    position:relative;
    float:left;
    margin:0;
    padding:0
}

#primary_nav_wrap ul a
{
    display:block;
    color:#333;
    text-decoration:none;
    font-weight:700;
    font-size:12px;
    line-height:32px;
    padding:0 15px;
    font-family:"HelveticaNeue","Helvetica Neue",Helvetica,Arial,sans-serif
}

#primary_nav_wrap ul li
{
    position:relative;
    float:left;
    margin:0;
    padding:0
}

#primary_nav_wrap ul li.current-menu-item
{
    background:#ddd
}

#primary_nav_wrap ul li:hover
{
    background:#f6f6f6
}

#primary_nav_wrap ul ul
{
    display:none;
    position:absolute;
    top:100%;
    left:0;
    background:#fff;
    padding:0
}

#primary_nav_wrap ul ul li
{
    float:none;
    width:200px
}

#primary_nav_wrap ul ul a
{
    line-height:120%;
    padding:10px 15px
}

#primary_nav_wrap ul ul ul
{
    top:0;
    left:100%
}

#primary_nav_wrap ul li:hover > ul
{
    display:block
}

但是您需要根據您的需要進一步構建它。