当我要选择菜单导航项时，我有一个简单的选择下拉菜单，所以现在当我将鼠标悬停在菜单项上时，导航将返回选择打开的选项列表。它发生在所有浏览器中。我不知道这是一个错误还是什么。步骤是：
我试过给位置的z-index。但没有任何工作。我认为这不是问题，但需要解释。任何建议将不胜感激。
这是示例代码：
<style type="text/css">
/* #################### Navigation bar CSS styling ################## */
.mynavbar {
position: relative;
width: 100%;
height: 23px; /* corresponds to 'line-height' of a.navbartitle below */
margin: 0; border: 0; padding: 0;
background-color: #666633;
}
a.navbartitle {
display: block;
float: left;
color: white;
background-color: #666633;
font-family: Verdana, Arial, Geneva, Helvetica, sans-serif;
font-size: 12px;
font-weight: bold;
margin: 0; border: 0; padding: 0;
line-height: 23px; /* corresponds to 'top' value of .submenu below */
text-align: center;
text-decoration:none;
}
a.navbartitle:hover {
background-color: #447755;
}
/* menu title widths */
#t1 { width: 104px; }
#t2 { width: 100px; }
#t3 { width: 102px; }
#t4 { width: 102px; }
#t5 { width: 180px; }
/* We just specify a fixed width for each menu title. Then, down below we specify
a fixed left position for the corresponding submenus (e.g. #products_submenu, etc.)
Using these fixed values isn't as elegant as just letting the text of each
menu title determine the width of the menu titles and position of the submenus,
but we found this hardwired approach resulted in fewer cross-browser/cross-OS
formatting glitches -- and it's pretty easy to adjust these title widths and the
corresponding submenu 'left' positions below, just by eyeballing them whenever
we need to change the navbar menu titles (which isn't often). */
.submenu {
position:absolute;
z-index: 2;
top: 23px; /* corresponds to line-height of a.navbartitle above */
padding: 0; margin: 0;
width:166px; /* If adjust this, then adjust width of .submenu below a too */
color: white;
background-color: #666633;
border: 1px solid #447755; /* box around entire sub-menu */
font-family: Verdana, Arial, Geneva, Helvetica, sans-serif;
font-size: 11px;
}
/* Fix IE formatting quirks. */
* html .submenu { width: 148px; } /* IE needs narrower than width of .submenu above */
/* End */
/* position of each sub menu */
/* We just eyeball the position of each submenu here -- can move left or right as needed.
If you adjust menu title text, you might want to adjust these too. */
#products_submenu { left: 0px; visibility: hidden; }
#services_submenu { left: 104px; visibility: hidden; }
#funstuff_submenu { left: 204px; visibility: hidden; }
#aboutus_submenu { left: 306px; visibility: hidden; }
#contact_submenu { left: 408px; visibility: hidden; }
/* Note, each submenu is hidden when the page loads - then made visible when
the mouse goes over the menu title. Using the 'visibility' property instead
of using the 'display' property avoided a bug in some versions of Safari.
(The bug is pretty where esoteric: The browser ignored the 'hover' property
on 'li' objects inside an object whose display property was set to 'none'
when the page loaded...) Using the 'visibility' property instead of 'display'
would normaly take up extra room on the page, but that's avoided here by putting
the submenu on a second layer: see 'position: absolute' and 'z-index: 2'
in .submenu definition, higher up this page. */
.submenu a
{
display: block;
color: #eee;
background-color: #666633;
width: 146px; /* This should be width of .submenu above minus right-side padding on next line */
padding: 5px 0px 4px 20px;
text-decoration: none;
background-color: #666633;
border-bottom: #447755 dotted 1px;
border-top: 0; border-left: 0; border-right: 0;
}
ul { position: relative; display: block; }
li { position: relative; display: block; }
.submenubox {
margin: 0; padding: 0; border: 0;
}
.submenubox ul
{
margin: 0; padding: 0; border: 0;
list-style-type: none;
}
.submenubox ul li {
margin: 0; padding: 0; border: 0;
}
.submenubox ul li a:link { }
.submenubox ul li a:visited { }
.submenubox ul li a:hover
{
color: #c6e8e2; /* text color for submenu items */
background-color: #447755;
border-bottom: #447755 dotted 1px;
}
</style>
<script type="text/javascript">
// JavaScript functions to show and hide drop-down menus.
// In SimpleNavBar.html we call ShowMenuDiv each time the mouse goes over
// either the menu title or the submenu itself, and call HideMenuDiv when the
// mouse goes out of the menu title or the submenu iteslf (onMouseOut).
function ShowItem (itemID) {
var x = document.getElementById(itemID);
if (x)
x.style.visibility = "visible";
return true;
}
function HideItem (itemID) {
var x = document.getElementById(itemID);
if (x)
x.style.visibility = "hidden";
return true;
}
// As noted in the SimpleNavBarStyles.css file, using x.style.visibility as
// seen below seemed to have better cross browser support than using
// x.style.display="block" and x.style.display="none" to show and hide
// the menu.
</script>
<div class="mynavbar">
<a onmouseover="ShowItem('products_submenu');" onmouseout="HideItem('products_submenu');" href="placeholder.html" id="t1" class="navbartitle">Products</a><a onmouseover="ShowItem('services_submenu');" onmouseout="HideItem('services_submenu');" href="placeholder.html" id="t2" class="navbartitle">Services</a><a onmouseover="ShowItem('funstuff_submenu');" onmouseout="HideItem('funstuff_submenu');" href="placeholder.html" id="t3" class="navbartitle">Fun Stuff</a><a onmouseover="ShowItem('aboutus_submenu');" onmouseout="HideItem('aboutus_submenu');" href="placeholder.html" id="t4" class="navbartitle">About Us</a><a onmouseover="ShowItem('contact_submenu', 't5');" onmouseout="HideItem('contact_submenu');" href="placeholder.html" id="t5" class="navbartitle">Contacts & Directions</a>
<!-- REPLACE each "placeholder.html" URL below with the specific page you want
the user to go to when the given submenu item is clicked. -->
<!-- Products sub-menu, shown as needed -->
<div onmouseout="HideItem('products_submenu');" onmouseover="ShowItem('products_submenu');" id="products_submenu" class="submenu" style="visibility: hidden;">
<div class="submenubox">
<ul>
<li><a class="submenlink" href="placeholder.html">Flying Cars</a></li>
<li><a class="submenlink" href="placeholder.html">Super Squirters</a></li>
<li><a class="submenlink" href="placeholder.html">Sling Shots</a></li>
<li><a class="submenlink" href="placeholder.html">Bamboozlers</a></li>
<li><a class="submenlink" href="placeholder.html">Kazoos</a></li>
</ul>
</div>
</div>
<!-- Services sub-menu, shown as needed -->
<div onmouseout="HideItem('services_submenu');" onmouseover="ShowItem('services_submenu');" id="services_submenu" class="submenu">
<div class="submenubox">
<ul>
<li><a class="submenlink" href="placeholder.html">Toy Design</a></li>
<li><a class="submenlink" href="placeholder.html">Market Research</a></li>
<li><a class="submenlink" href="placeholder.html">IP Consulting</a></li>
<li><a class="submenlink" href="placeholder.html">Licensing</a></li>
</ul></div>
</div>
<!-- Fun Stuff sub-menu, shown as needed -->
<div onmouseout="HideItem('funstuff_submenu');" onmouseover="ShowItem('funstuff_submenu');" id="funstuff_submenu" class="submenu" style="visibility: hidden;">
<div class="submenubox">
<ul>
<li><a class="submenlink" href="placeholder.html">Toys We Designed</a></li>
<li><a class="submenlink" href="placeholder.html">Press Ravings</a></li>
<li><a class="submenlink" href="placeholder.html">Our Blog</a></li>
</ul>
</div>
</div>
<!-- About Us sub-menu, shown as needed -->
<div onmouseout="HideItem('aboutus_submenu');" onmouseover="ShowItem('aboutus_submenu');" id="aboutus_submenu" class="submenu" style="visibility: hidden;">
<div class="submenubox">
<ul>
<li><a class="submenlink" href="placeholder.html">Team</a></li>
<li><a class="submenlink" href="placeholder.html">Investors</a></li>
<li><a class="submenlink" href="placeholder.html">Partners</a></li>
<li><a class="submenlink" href="placeholder.html">Careers</a></li>
<li><a class="submenlink" href="placeholder.html">Our Blog</a></li>
</ul>
</div>
</div>
<!-- CONTACTS & DIRECTIONS sub-menu, shown as needed -->
<div onmouseout="HideItem('contact_submenu');" onmouseover="ShowItem('contact_submenu');" id="contact_submenu" class="submenu" style="visibility: hidden;">
<div class="submenubox">
<ul>
<li><a class="submenlink" href="placeholder.html">Contact</a></li>
<li><a class="submenlink" href="placeholder.html">Getting Here</a></li>
</ul>
</div>
</div><!-- end of sub-meus -->
</div>
<div><select style="margin-left: 200px; position: relative; z-index: 0;">
<option value=""></option>
<option value="28">Test</option>
<option value="Eff2">Test</option>
<option value="Effort1">Test</option>
<option value="FC">Test</option>
<option value="Effort1">Test</option><option value="Effort1">Test</option><option value="Effort1">Test</option><option value="Effort1">Test</option>
</select>
</div>
答案 0 :(得分：9)
<select>元素是HTML5中的interactive content元素和HTML4.01中的menu元素。因此，它是一个需要用户输入的对象，其行为类似于右键单击上下文菜单，并且如果处于活动状态，则呈现在所有文档元素之上。亲自尝试 - 打开你的上下文菜单并将鼠标悬停在导航栏上。
此错误与其他互动内容元素（例如video）的行为相关联（另请参阅HTML5 rendering）。
防止此类行为的唯一方法是在悬停交互式元素时将活动选择的显示属性更改为none。 visibility:hidden;无效，因为选项仍然显示，并且在选项上使用display:none;会导致呈现错误。
Here is a small demonstration上述技术：
.mynavbar:hover ~ * .selecthack > select:focus
.mynavbar:hover ~ .selecthack > select:focus{
display:none;
}
答案 1 :(得分：1)
非常简单
$('IdOfMenu').on('mouseenter', function() {
$("IdOfDropDown").blur();
});
答案 2 :(得分：0)
将z-index设置为-1，使其显示在底部。因此，在您的select元素上，您有一个将z-index定义为1的内联样式。将其更改为负1。
<select style="margin-left: 200px; position: relative; z-index: -1;">
我在IE8中试过这个并且它有效。选择下拉菜单位于菜单选项后面。
答案 3 :(得分：0)
对于那些遇到同样问题的人来说非常简单，请在您的代码菜单下添加以下代码，这适用于所有导航员。
<input id="HideMenusTxt" name="HideMenusTxt" type="text" value="0" style="width:0;height:0;position:absolute;z-index:-1"/>
<script type="text/javascript">
//menuId= The Id of the div menu
$('#menuId').on('mouseenter', function() {
//in case we have opened select dropdown options, on mouseenter of the menu we set focus to "HideMenusTxt".
$('#HideMenusTxt').focus();
});
答案 4 :(得分：0)
其他解决方案，检查表单中是否有选择并关注表单中的第一个元素，而不是创建隐藏字段。
$('#menuId').mouseover(function () {
//in case we have opened select dropdown options, on mouseover of the menu we set focus to the first element in the form.
var firstSelectElement = $('form:first select:first');
if (firstSelectElement.length > 0) {
$('form:first *:input[type!=hidden]:first').focus();
}
});
答案 5 :(得分：0)
使用display: none会导致下拉列表失去焦点，如果有 - 至少在Chrome中，而不是在Firefox中。如果在使用下拉列表时显示某些内容而不是<select>，则会导致问题（通过某些自定义HTML替换选项）。
使用position: relative; z-index: -1也可能会造成麻烦：由于<select>消失在默认图层后面，因此可能无法点击下拉列表。此外，＆＃34;焦点＆＃34;在呈现选项后可能会触发事件，因此通过JavaScript更改z-index可能无法按预期工作。
我想出了一个解决方案，将下拉菜单移出视线＆＃34;焦点＆＃34;然后重新开始＆＃34;模糊＆＃34;：
position: relative; left: -9999px;
与display: none相比，此解决方案还保持布局完整（除了下拉列表消失），因为下拉列表可以定义其父块元素的高度。
答案 6 :(得分：0)
正如Zeta所说，选择框是一个互动元素，您无法使用HTML / CSS显示其上方的任何内容，因此唯一的选择是在显示菜单时隐藏它，或者只是{{1}任何blur ed在页面上选择。
如果您不想添加任何其他css课程，则可以在focus函数的开头blur()简单地ShowItem：
...
function ShowItem (itemID) {
//jQuery version
$('select:focus').blur();
//OR non-jQuery:
document.activeElement.blur();
//note this will blur any focused element, so you might want to check
//if document.activeElement.tagName == 'SELECT' first, or other conditions
var x = document.getElementById(itemID);
...
...或更一般地（对于不在您的特定情况下的其他读者）在触发子菜单外观的菜单项的hover或mouseenter事件回调中。