我正在尝试使用css3下拉菜单创建一个按钮....我已经尝试了几种不同的方法来执行此操作....所有问题都是它们在后面的元素下分层....我从网上的例子中获取了这些代码......在许多例子中，代码出现在前面......我的代码出了问题......我认为这是z-index ....但需要一些关于在哪里寻找问题的指示。
如果你看一下动作＆＃34;按钮＆＃34;当你将鼠标悬停在它上面时，下拉列表就在其他代码后面....
这里有一个指向jsfiddle上代码的指针。 http://jsfiddle.net/n3Zwm/
这是代码
<!DOCTYPE html>
<html lang="en">
<body>
<div>
<section>
<form action="/Vehicle/Info/VinInquiry" method="post"> <div class="divTable" >
<div class="divTableRow">
<div class="divTableCell"><label>VIN</label> </div>
<div class="divTableCell">
<input id="VIN" name="VIN" type="text" value="" />
</div>
<div class="divTableCell"> <input type="submit" value="Display" /> </div>
<select name="Attachments">
<option>Attach a File</option>
</select>
<div class="divTableCell"> <input type="submit" value="Clear" /> </div>
<div class="divTableCell"> <input type="submit" value="Email" /> </div>
</div>
</div>
<div class="divTable">
<div class="divTableRow">
<div class="divTableCell">
<ul id="nav">
<li>
<a href="#">Actions</a>
<ul>
<li><a href="#">Add Comment</a></li>
<li><a href="#">Add Allocation</a></li>
<li><a href="#">Change Allocation</a></li>
<li><a href="#">Cancel Allocation</a></li>
<li><a href="#">Edit Dealer</a></li>
<li><a href="#">Change Hotrush Status</a></li>
<li><a href="#">Relocate Vehicle</a></li>
<li><a href="#">Add Service Request</a></li>
<li><a href="#">???? Ship Voyage Entry</a></li>
<li><a href="#">Goto Process Manager</a></li>
<li><a href="#">Cancel WorkOrder (Grid based)</a>
</li>
<li><a href="#">Change WorkOrder Priority (Grid based)
</a></li>
<li><a href="#">Undo WorkOrder (Grid based </a>
</li>
</ul>
</li>
</ul>
</div>
</div>
</div>
<section>
<div class="layer1">
<p class="heading">General Vehicle Info (Status: )</p>
<div class="content">
<div class="cols">
<div class="col1">
<section class="chunk">
<fieldset>
<legend class="hd">
<span class="text">Receiving Info</span>
</legend>
<div class="vinTable">
<div class="vinTableRow">
<div class="labelTableCell"> <label>Voyage: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Vessel: </label> </div>
<div class="vinTableCell"> <label> ( )</label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Date: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Surveyed: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
</div>
</fieldset>
</section>
<br />
<div class="group">
<div class="vinTable">
<div class="vinTableRow">
<div class="labelTableCell"> <label>Location: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Employee: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Date: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
</div>
</div>
<br />
<div class="group">
<div class="vinTable">
<div class="vinTableRow">
<div class="labelTableCell"> <label>Carrier: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Load#: </label> </div>
<div class="vinTableCell"> <label> - </label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Type: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Ramp: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
</div>
</div>
</div>
<div class="col2">
<div class="group">
<div class="vinTable">
<div class="vinTableRow">
<div class="labelTableCell"> <label>Model: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Color: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Options: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
</div>
</div>
<br />
<div class="group">
<div class="vinTable">
<div class="vinTableRow">
<div class="labelTableCell"> <label>Status: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>HotRush: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>BillTo: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>ShipTo: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Dealer: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Sales Type: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>AllocationDate: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>ShippingAuth: </label> </div>
<div class="vinTableCell"> <label>0</label> </div>
</div>
</div>
</div>
</div>
<div class="col3">
<div class="group">
<div class="vinTable">
<div class="vinTableRow">
<div class="labelTableCell"> <label>Category: </label> </div>
<div class="vinTableCell"> <label> ()</label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Status: </label> </div>
<div class="vinTableCell"> <label> - </label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Status: </label> </div>
<div class="vinTableCell"> <label> - </label> </div>
</div>
</div>
</div>
<br />
<div class="group">
<div class="vinTable">
<div class="vinTableRow">
<div class="labelTableCell"> <label>Pkn No: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Check8 Date: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Maint Ref Date: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Car Covered: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Factory SP: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Sp Installed: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>ProductionYN: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>ProdSchedDate: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
</div>
</div>
</div>
<div class="col4">
<div class="group">
<div class="vinTable">
<div class="vinTableRow">
<div class="labelTableCell"> <label>Vin17: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Commission#: </label> </div>
<div class="vinTableCell"> <label> (Yr: 0)</label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Archived Veh: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>Control Veh: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>ControlVehRecDate: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>ReleaseRecord: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>TentativeSchedDate: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
<div class="vinTableRow">
<div class="labelTableCell"> <label>ServiceRequest: </label> </div>
<div class="vinTableCell"> <label></label> </div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</section>
</form>
<style>
.ScanVINTextBoxStyle3 { width: 180px; }
.vinTable { width: 100%; height: 10%; display: table; }
.vinTableRow { width: 100%; height: 100%; display: table-row;}
.labelTableCell { width: 50px; height: 100%; display: table-cell;}
.vinTableCell { width: 100%; height: 100%; display: table-cell;}
.group {border: solid thin; background: #EEEEEE; color: black; padding: 0.5em 1em; }
.cols { width:1800px; }
.col1, .col2, .col3, .col4 { width:350px; margin:0 5px; padding:10px; float:left; }
.chunk {
background:#ccf;
border:0.2em solid #99c;
border-top-left-radius:0.8em;
border-top-right-radius:0.8em;
display:block;
margin-bottom:2em;
overflow:hidden;
position:relative;
}
.chunk fieldset {
border:none;
margin:0;
padding:0;
}
.chunk legend {
border:none;
margin:0;
padding:0;
}
.chunk .hd {
display:block;
padding:0.5em 0 0.3em;
width:100%; /* For IE8 */
}
.chunk .hd .text {
color:#003;
font-family:helvetica,arial;
font-size:138.5%;
font-weight:normal;
margin:0 0.5em;
white-space:normal;
display:block;zoom:1; /* For IE7 */
}
.chunk .bd {
background: #eef;
border-top:0.2em solid #99c;
padding:1em 0.5em;
}
.chunk ol {
margin:0;
padding:0;
}
.chunk .fields li {
list-style-type:none;
margin-bottom:1em;
overflow:hidden;
position:relative;
}
.chunk .list li {
background:#edf;
color:#336;
padding:0.2em;
}
.chunk .list li:nth-child(2n) {
background:#dce;
}
.chunk .fields .label {
float:left;
font-size:108%;
width:25%;
}
.chunk .fields .field {
font-size:108%;
margin-left:30%;
padding-right:7px;
position:relative;
}
.chunk .fields .field input[type=text]{
width:100%;
}
.chunk .fields .field.tiny input[type=text]{
width:5em;
}
.chunk .fields .field.date input[type=text]{
width:7em;
}
.chunk .fields .field.small input[type=text]{
max-width:17em;
}
.chunk .fields .field textarea {
height:6em;
width:100%;
}
.layer1
{
margin : 0;
padding : 0;
width : 1550px;
}
.heading
{
margin : 1px;
color : #fff;
padding : 3px 10px;
cursor : pointer;
position : relative;
background-color: #c30;
}
.content
{
padding : 5px 10px;
background-color: #fafafa;
}
p
{
padding: 5px 0;
}
/*------------------------------------*\
RESET
\*------------------------------------*/
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td{
margin:0;
padding:0;
}
table{
border-collapse:collapse;
border-spacing:0;
}
fieldset,img{
border:0;
}
address,caption,cite,code,dfn,th,var{
font-style:normal;
font-weight:normal;
}
caption,th{
text-align:left;
}
h1,h2,h3,h4,h5,h6{
font-size:100%;
font-weight:normal;
}
q:before,q:after{
content:'';
}
abbr,acronym{
border:0;
}
/*------------------------------------*\
NAV
\*------------------------------------*/
#nav{
list-style:none;
font-weight:bold;
margin-bottom:10px;
/* Clear floats */
float:left;
width:100%;
/* Bring the nav above everything else--uncomment if needed.
position:relative;
z-index:5;
*/
}
#nav li{
float:left;
margin-right:10px;
position:relative;
}
#nav a{
display:block;
padding:5px;
color:#fff;
background:#333;
text-decoration:none;
}
#nav a:hover{
color:#fff;
background:#6b0c36;
text-decoration:underline;
}
/*--- DROPDOWN ---*/
#nav ul{
background:#fff; /* Adding a background makes the dropdown work properly in IE7+. Make this as close to your page's background as possible (i.e. white page == white background). */
background:rgba(255,255,255,0); /* But! Let's make the background fully transparent where we can, we don't actually want to see it if we can help it... */
list-style:none;
position:absolute;
left:-9999px; /* Hide off-screen when not needed (this is more accessible than display:none;) */
}
#nav ul li{
padding-top:1px; /* Introducing a padding between the li and the a give the illusion spaced items */
float:none;
}
#nav ul a{
white-space:nowrap; /* Stop text wrapping and creating multi-line dropdown items */
}
#nav li:hover ul{ /* Display the dropdown on hover */
left:0; /* Bring back on-screen when needed */
}
#nav li:hover a{ /* These create persistent hover states, meaning the top-most link stays 'hovered' even when your cursor has moved down the list. */
background:#6b0c36;
text-decoration:underline;
}
#nav li:hover ul a{ /* The persistent hover state does however create a global style for links even before they're hovered. Here we undo these effects. */
text-decoration:none;
}
#nav li:hover ul li a:hover{ /* Here we define the most explicit hover states--what happens when you hover each individual link. */
background:#333;
}
.ScanVINTextBoxStyle3 { width: 180px; }
.divTable { width: 35%; height: 10%; display: table; }
.divTableRow { width: 100%; height: 100%; display: table-row;}
.divTableCell { width: 25%; height: 100%; display: table-cell;}
</style>
</section>
</div>
</body>
</html>
答案 0 :(得分：1)
是的，先生是 z-index ，只需按照以下方式添加：
#nav li:hover ul {
left: 0;
z-index: 22222;
}