jquery - 移动顶部导航问题

Question

我的网站是http://www.kaniamea.com/ph/ .请最小化屏幕或使用移动设备查看此页面。然后，当您单击菜单图标所在的右上角时，标题会随着下拉菜单的出现而跳起(这会导致隐藏整个标题)。有没有办法防止这种情况，所以当您单击菜单图标时，菜单将出现在下面而不隐藏顶部的标题？谢谢大家，祝大家圣诞快乐!

<!-- Start Main -->
<div id="main">
  <!-- Start Header -->
  <div id="header">
    <!-- Start Logo -->
    <div id="logo">
      <h1><a href="#">Logo</a></h1>
    </div>
    <!-- End Logo -->
    <!-- Start Nav -->
    <div id="nav" role="navigation"> <a href="#nav" title="Show navigation">Show navigation</a> <a href="#" title="Hide navigation" >Hide navigation</a>
      <ul class="clearfix">
        <li class="home"><a href="link.html">Home</a></li>
        <li><a href="link.html">What Happened</a></li>
        <li><a href="link.html">Today</a></li>
        <li> <a href="javascript:void(0);" aria-haspopup="true"><span>Visit</span></a>
          <ul>
            <li> <a href="link.html">Tours</a></li>
            <li> <a href="link.html">Directions</a></li>
            <li><a href="link.html">Operating Hours</a></li>
            <li><a href="link.html">Things To Do</a></li>
            <li><a href="link.html">Before You Come</a></li>
             </ul>
        </li>
        <li> <a href="javascript:void(0);" aria-haspopup="true"><span>Battleships</span></a>
          <ul>
            <li> <a href="link.html">Arizona</a></li>
            <li><a href="link.html">Oklahoma</a></li>
            <li><a href="link.html">West Virginia</a></li>
            <li><a href="link.html">California</a></li>
            <li><a href="link.html">Nevada</a></li>
            <li><a href="link.html">Pennsylvania</a></li>
            <li><a href="link.html">Maryland</a></li>
            <li><a href="link.html">Missouri</a></li>
            <li><a href="link.html">Tennessee</a></li>
            <li><a href="link.html">Utah</a></li>
          </ul>
        </li>      
      </ul>
    </div>
    <!-- End Nav -->
  </div>
  <!-- End Header -->

导航 CSS 是:

#nav {
    display: block;
    background-image: url("images/nav-bg.png");
    background-repeat: no-repeat;
    width: 681px;
    height: 63px;
    float: right;
    margin-right: -1.77em;
    margin-top: 1.6em;
}
#nav > a {
    display: none;
}
#nav li {
    position: relative;
}
#nav li a {
    padding: 20px 25px 20px 25px;
    color: #FFF;
    font-size: 1.1em !important;
    text-decoration: none;
    font-weight: bold;
    display:block;
}
#nav li a:hover {
    background-image:url(images/hover.png);
    background-repeat: repeat-x;
}
#nav span:after {
    width: 0;
    height: 0;
    border: 0.313em solid transparent; /* 5 */
    border-bottom: none;
    border-top-color: #F81302;
    content: '';
    vertical-align: middle;
    display: inline-block;
    position: relative;
    right: -0.313em; /* 5 */
}
/* first level */

#nav > ul > li {
    float: left;
    z-index:1000;
    overflow:visible;
}
#nav > ul > li > a {
    height: 100%;
    font-size: 1.1em; /* 24 */
}
 #nav > ul > li:hover > a,  #nav > ul:not( :hover ) > li.active > a {
 background-image:url(images/hover.png);
 background-repeat: repeat-x;
}
/* second level */

#nav li ul {
    background-color: #BE0115;
    display: none;
    position: absolute; 
    top: 100%;
    width:170px;
}
#nav li:hover ul {
    display: block;
    left: 0;
    right: 0;
}
 #nav li:not( :first-child ):hover ul {
 left: -1px;
}
#nav li ul a {
    font-size: 1.25em; /* 20 */
    border-top: 1px solid #D90018;
    padding: 0.75em; /* 15 (20) */
}
 #nav li ul li a:hover,  #nav li ul:not( :hover ) li.active a {
 background-image:url(images/drop-nav-bg.png);
 background-repeat: repeat-x;
}

 @media only screen and ( max-width: 800px ) {
 html {
 font-size: 75%; /* 12 */
}
 #nav {
 width: 100%;
 position: static;
 margin: 0;
 top: auto;
 left: auto;
 background-image: none;
 float: right;
 height:auto;
 }

 #nav > a {
 width: 40px;
 height: 40px;
 text-align: left;
 text-indent: -9999px;
 background: url("images/menu-icon.png") repeat scroll center center #4C8FEC;
 float: right;
 margin-top: -45px !important;
}
 #nav > a:before,  #nav > a:after {
 margin-right:40px;
 margin-top:10px;
 content: '';
}
 #nav > a:after {
 margin-top:10px;
}
 #nav:not( :target ) > a:first-of-type,  #nav:target > a:last-of-type {
 display:block;


}
 #nav > ul > li:hover > a,  #nav > ul:not( :hover ) > li.active > a {
 background-image:none;
}

/* first level */

#nav > ul {
 height: auto;
 display: none;
 left: 0;
 right: 0;
 height: 3.75em;
 width: 200px;
 float:right;

}
 #nav:target > ul {
 display: block;
}
 #nav > ul > li {
 width: 100%;
 float: right;

}
 #nav > ul > li > a {
 height: auto;
 text-align: left;
 padding: 0 0.833em; /* 20 (24) */
 height: 100%;
 font-size: 1.1em; /* 24 */
 line-height: 2.5em; /* 60 (24) */
 background-color: #BE0115;
}
 #nav > ul > li > a:hover {
 background-image:url(images/drop-nav-bg.png);
 background-repeat: repeat-x;
}
 #nav > ul > li:not( :last-child ) > a {
 border-right: none;
}
#nav > ul > li:not(:last-child) > a {
 border-right: medium none;
 border-bottom: 1px solid #D90018;
}

/* second level */

#nav li ul {
 padding-top: 0;
 width: 200px;
 position: static; 
}
}

Answer 1

您看到的问题源于使用 #nav:target 呈现导航。您告诉浏览器“仅当 url 栏为 http://www.kaniamea.com/ph/#nav 时才显示菜单...通过应用 #nav，您还告诉浏览器跳转到带有 id="nav" 的元素。

您的 css 不依赖于 :target，您可以改为执行 #nav.showNav，并添加一个切换 showNav 类的点击事件。

$(function() {
    $('.toggle-nav').click(function(event){
        event.preventDefault();
        $('#nav').toggleClass('showNav');
    });
});

这里重要的是您正在调用 event.preventDefault();，这会阻止您点击链接时的默认点击行为。

这是您的网站，这里有示例 jquery:http://jsfiddle.net/zc6w276o/