我正在整个文档中运行媒体查询,但是在这里我只想解释发生了什么。无论使用什么设备,都可以使此菜单保持居中状态?因此,如果没有足够的空间让所有菜单项都停留在一行上,它会将其余菜单项放在下面的行中,然后在屏幕上显示centres,而不是从左侧开始新行?它可能与菜单上剩余的浮点数有关,但这是使滚动条保持水平的唯一方法。谢谢。
下面的HTML和CSS,但我建议在JSFiddle上查看它:https://jsfiddle.net/rt518s7p/
HTML:
<nav id="page-navigation">
<ul>
<li><a href="../../index.html" title="Home">Home</a></li>
<ul class="top-menu">
<li><a href="../../_portfolio/photography.html" onclick="return false">Photography</a>
<ul class="sub-menu">
<li><a href="../../_portfolio/_photography/bmc-himley-mini-show-2015.html">BMC Himley Mini Show 2015</a></li>
<li><a href="../../_portfolio/_photography/kinver-snow.html">Kinver Snow</a></li>
<li><a href="../../_portfolio/_photography/mini-runs-collection.html">"Mini Runs" Collection</a></li>
<li><a href="../../_portfolio/_photography/hofner-bass.html">Hofner Bass</a></li>
<li><a href="../../_portfolio/_photography/nature.html">Nature</a></li>
<li><a href="../../_portfolio/_photography/haynes-motor-museum.html">Haynes Motor Museum</a></li>
<li><a href="../../_portfolio/_photography/miscellaneous.html">Miscellaneous</a></li>
<li><a href="../../_portfolio/_photography/classic-mini.html">Classic Mini</a></li>
</ul>
</li>
<li><a href="../../_portfolio/graphic-design.html" onclick="return false">Graphic Design</a>
<ul class="sub-menu">
<li><a href="../../_portfolio/_graphic-design/story-bag-artwork.html">"Story Bag" Artwork</a></li>
<li><a href="../../_portfolio/_graphic-design/business-cards.html">Business Cards</a></li>
<li><a href="../../_portfolio/_graphic-design/logo-design.html">Logo Design</a></li>
<li><a href="../../_portfolio/_graphic-design/the-mexican-job.html">"The Mexican Job"</a></li>
<li><a href="../../_portfolio/_graphic-design/magazine-covers.html">Magazine Covers</a></li>
<li><a href="../../_portfolio/_graphic-design/wpap-artwork.html">WPAP Artwork</a></li>
<li><a href="../../_portfolio/_graphic-design/lyric-posters.html">Lyrics Posters</a></li>
</ul>
</li>
<li><a href="../../_portfolio/3d-modelling.html">3D Modelling</a></li>
</ul>
<li><a href="../../about.html">About</a></li>
<li><a href="../../recognition.html">Recognition</a></li>
</ul>
</nav>
CSS:
/*navigation*/
#page-navigation
{
width: 70%;
height: 53px;
margin-left: auto;
margin-right: auto;
margin-bottom: 10px;
}
#page-navigation ul li
{
color: white;
list-style: none;
background-color: darkslategray;
width: 9em;
float: left;
}
li
{
position: relative;
}
li.title
{
display: none;
}
li a
{
display: block;
color: white;
line-height: 1.3em;
padding: 1em;
text-align: center;
}
li a:link
{
text-decoration: none;
}
li a:visited
{
text-decoration: none;
color: white;
}
li a:hover, .top-menu > li:hover > a
{
background-color: rgb(48,48,48);
}
li a:active
{
background-color: dimgray;
}
ul.sub-menu
{
width: auto;
height: auto;
position: absolute;
left: -9000em;
overflow: hidden;
}
ul.sub-menu li
{
clear: left;
float: none;
margin-left: -2.5em;
z-index: 1000;
}
.top-menu li:hover ul
{
left: 0;
}
ul.sub-menu li a
{
height: auto;
border-bottom: 1px solid gray;
padding: .4em 1em;
background-color: dimgray;
padding-top: 1em;
padding-bottom: 1em;
}
ul.sub-menu li:last-child a
{
border-bottom: none;
}
ul.sub-menu li a:hover
{
background-color: darkslategray;
}
ul.sub-menu li a:active
{
background-color: gray;
}
ul.top-menu
{
padding: 0;
}
答案:
由于HTML文档的结构方式,由于以下原因,您无法获得预期的效果:
推荐:
首先仅在顶部导航项上使用适当的类来固定HTML文档的结构,然后正确嵌套导航项。*
我建议您重组信息架构,以使菜单上的导航项更少。例如,在您的“关于”页面中进行识别将很有意义。如果这是一个投资组合类型的网站,那么将您的摄影,图形设计和3D建模整合到项目中将会很好。而且,如果您担心分离,则将在页面内作为子导航进行。
如果您设置为保留导航结构,建议您将菜单折叠到移动设备上的选择菜单或汉堡菜单中,因为导航会占用某人的很大一部分移动设备屏幕,对于您的用户。最重要的是,您必须考虑到用户无法在移动设备上“悬停”,并且这些下拉列表的大小最多很难导航。
*解决方案: Demo
HTML(固定):
<nav id="page-navigation">
<ul>
<li><a href="../../index.html" title="Home">Home</a></li>
<li class="top-menu"><a href="../../_portfolio/photography.html" onclick="return false">Photography</a>
<ul class="sub-menu">
<li><a href="../../_portfolio/_photography/bmc-himley-mini-show-2015.html">BMC Himley Mini Show 2015</a></li>
<li><a href="../../_portfolio/_photography/kinver-snow.html">Kinver Snow</a></li>
<li><a href="../../_portfolio/_photography/mini-runs-collection.html">"Mini Runs" Collection</a></li>
<li><a href="../../_portfolio/_photography/hofner-bass.html">Hofner Bass</a></li>
<li><a href="../../_portfolio/_photography/nature.html">Nature</a></li>
<li><a href="../../_portfolio/_photography/haynes-motor-museum.html">Haynes Motor Museum</a></li>
<li><a href="../../_portfolio/_photography/miscellaneous.html">Miscellaneous</a></li>
<li><a href="../../_portfolio/_photography/classic-mini.html">Classic Mini</a></li>
</ul>
</li>
<li class="top-menu"><a href="../../_portfolio/graphic-design.html" onclick="return false">Graphic Design</a>
<ul class="sub-menu">
<li><a href="../../_portfolio/_graphic-design/story-bag-artwork.html">"Story Bag" Artwork</a></li>
<li><a href="../../_portfolio/_graphic-design/business-cards.html">Business Cards</a></li>
<li><a href="../../_portfolio/_graphic-design/logo-design.html">Logo Design</a></li>
<li><a href="../../_portfolio/_graphic-design/the-mexican-job.html">"The Mexican Job"</a></li>
<li><a href="../../_portfolio/_graphic-design/magazine-covers.html">Magazine Covers</a></li>
<li><a href="../../_portfolio/_graphic-design/wpap-artwork.html">WPAP Artwork</a></li>
<li><a href="../../_portfolio/_graphic-design/lyric-posters.html">Lyrics Posters</a></li>
</ul>
</li>
<li><a href="../../_portfolio/3d-modelling.html">3D Modelling</a></li>
<li><a href="../../about.html">About</a></li>
<li><a href="../../recognition.html">Recognition</a></li>
</ul>
</nav>
CSS(已修复和更新):
/*navigation*/
#page-navigation {
width: 100%;
margin-left: auto;
margin-right: auto;
margin-bottom: 10px;
}
#page-navigation ul {
text-align: center;
}
#page-navigation ul li {
color: white;
list-style: none;
background-color: darkslategray;
width: 9em;
/* float: left removes any possibility of it centering */
display: inline-block;
}
li {
position: relative;
}
li.title {
display: none;
}
li a {
display: block;
color: white;
line-height: 1.3em;
padding: 1em;
text-align: center;
}
li a:link {
text-decoration: none;
}
li a:visited {
text-decoration: none;
color: white;
}
li a:hover,
.top-menu > li:hover > a {
background-color: rgb(48, 48, 48);
}
li a:active {
background-color: dimgray;
}
ul.sub-menu {
width: auto;
height: auto;
position: absolute;
left: -9000em;
overflow: hidden;
}
ul.sub-menu li {
clear: left;
float: none;
margin-left: -2.5em;
z-index: 1000;
}
.top-menu:hover ul {
left: 0;
}
ul.sub-menu li a {
height: auto;
border-bottom: 1px solid gray;
padding: .4em 1em;
background-color: dimgray;
padding-top: 1em;
padding-bottom: 1em;
}
ul.sub-menu li:last-child a {
border-bottom: none;
}
ul.sub-menu li a:hover {
background-color: darkslategray;
}
ul.sub-menu li a:active {
background-color: gray;
}
ul.top-menu {
padding: 0;
}
仍有一些较小的样式可以调整,但这将根据您的问题为您提供想要的东西。