如何使用父链接处理导航下拉子菜单

Question

我设计的网站使用导航菜单显示val ds = Seq(( 1, "2016-10-12 01:45:01", 1, 3), ( 1, "2016-10-12 01:48:01", 0, 3), ( 1, "2016-10-12 01:50:01", 1, 3), ( 1, "2016-10-12 01:52:01", 1, 3), ( 2, "2016-10-12 01:53:01", 1, 3), ( 2, "2016-10-12 02:10:01", 1, 3), ( 3, "2016-10-12 01:45:01", 1, 3), ( 3, "2016-10-12 01:45:01", 1, 3)). toDF("id", "time", "type", "day") .withColumn("timestamp", unix_timestamp($"time", "yyyy-MM-dd HH:mm:ss")) val happenBeforeHalfHour = ds.as("left").join(ds.as("right"), $"left.id" === $"right.id" && $"right.type" === 1 && $"left.timestamp" > $"right.timestamp" && $"left.timestamp" - $"right.timestamp" <= 1800) .select($"left.id", $"left.time", $"left.type", $"left.day",$"left.timestamp") happenBeforeHalfHour.groupBy("id", "time", "type", "day", "timestamp").count.show(false) +---+-------------------+----+---+----------+-----+ |id |time |type|day|timestamp |count| +---+-------------------+----+---+----------+-----+ |1 |2016-10-12 01:48:01|0 |3 |1476211681|1 | |2 |2016-10-12 02:10:01|1 |3 |1476213001|1 | |1 |2016-10-12 01:52:01|1 |3 |1476211921|2 | |1 |2016-10-12 01:50:01|1 |3 |1476211801|1 | +---+-------------------+----+---+----------+-----+ 上的子菜单，但它在台式机和笔记本电脑设备上运行良好。

最大的问题是，当在移动设备或平板电脑设备上打开导航菜单时，它在以下情况下不会显示子菜单：将鼠标悬停在父级上？

目标是：

• 当在移动设备或平板设备上打开导航菜单时，功能应该是显示子菜单，并且在子菜单显示时也应该可以点击href链接

有什么可以改进的和/或你看到这种方法有什么问题吗？

HTML

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:hover

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(function($) { // Begin jQuery
		  $(function() { // DOM ready
			// If a link has a dropdown, add sub menu toggle.
			$('nav ul li a:not(:only-child)').hover(function(e) {
			  $(this).siblings('.nav-dropdown').toggle();
			  // Close one dropdown when selecting another
			  $('.nav-dropdown').not($(this).siblings()).hide();
			  e.stopPropagation();
			});
			// Clicking away from dropdown will remove the dropdown class
			$('html').click(function() {
			  $('.nav-dropdown').hide();
			});
			// Toggle open and close nav styles on click
			$('#nav-toggle').click(function() {
			  $('nav ul').slideToggle();
			});
			// Hamburger to X toggle
			$('#nav-toggle').on('click', function() {
			  this.classList.toggle('active');
			});
		  }); // end DOM ready
		})(jQuery); // end jQuery

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Answer 1

$("#cssmenu").menumaker({
    title: "Menu",
    breakpoint: 768,
    format: "multitoggle"
});

@import url(https://fonts.googleapis.com/css?family=Montserrat:400,700);
#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a,
#cssmenu #menu-button {
  margin: 0;
  padding: 0;
  border: 0;
  list-style: none;
  line-height: 1;
  display: block;
  position: relative;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
#cssmenu:after,
#cssmenu > ul:after {
  content: ".";
  display: block;
  clear: both;
  visibility: hidden;
  line-height: 0;
  height: 0;
}
#cssmenu #menu-button {
  display: none;
}
#cssmenu {
  font-family: Montserrat, sans-serif;
  background: #333333;
}
#cssmenu > ul > li {
  float: left;
}
#cssmenu.align-center > ul {
  font-size: 0;
  text-align: center;
}
#cssmenu.align-center > ul > li {
  display: inline-block;
  float: none;
}
#cssmenu.align-center ul ul {
  text-align: left;
}
#cssmenu.align-right > ul > li {
  float: right;
}
#cssmenu > ul > li > a {
  padding: 17px;
  font-size: 12px;
  letter-spacing: 1px;
  text-decoration: none;
  color: #dddddd;
  font-weight: 700;
  text-transform: uppercase;
}
#cssmenu > ul > li:hover > a {
  color: #ffffff;
}
#cssmenu > ul > li.has-sub > a {
  padding-right: 30px;
}
#cssmenu > ul > li.has-sub > a:after {
  position: absolute;
  top: 22px;
  right: 11px;
  width: 8px;
  height: 2px;
  display: block;
  background: #dddddd;
  content: '';
}
#cssmenu > ul > li.has-sub > a:before {
  position: absolute;
  top: 19px;
  right: 14px;
  display: block;
  width: 2px;
  height: 8px;
  background: #dddddd;
  content: '';
  -webkit-transition: all .25s ease;
  -moz-transition: all .25s ease;
  -ms-transition: all .25s ease;
  -o-transition: all .25s ease;
  transition: all .25s ease;
}
#cssmenu > ul > li.has-sub:hover > a:before {
  top: 23px;
  height: 0;
}
#cssmenu ul ul {
  position: absolute;
  left: -9999px;
}
#cssmenu.align-right ul ul {
  text-align: right;
}
#cssmenu ul ul li {
  height: 0;
  -webkit-transition: all .25s ease;
  -moz-transition: all .25s ease;
  -ms-transition: all .25s ease;
  -o-transition: all .25s ease;
  transition: all .25s ease;
}
#cssmenu li:hover > ul {
  left: auto;
}
#cssmenu.align-right li:hover > ul {
  left: auto;
  right: 0;
}
#cssmenu li:hover > ul > li {
  height: 35px;
}
#cssmenu ul ul ul {
  margin-left: 100%;
  top: 0;
}
#cssmenu.align-right ul ul ul {
  margin-left: 0;
  margin-right: 100%;
}
#cssmenu ul ul li a {
  border-bottom: 1px solid rgba(150, 150, 150, 0.15);
  padding: 11px 15px;
  width: 170px;
  font-size: 12px;
  text-decoration: none;
  color: #dddddd;
  font-weight: 400;
  background: #333333;
}
#cssmenu ul ul li:last-child > a,
#cssmenu ul ul li.last-item > a {
  border-bottom: 0;
}
#cssmenu ul ul li:hover > a,
#cssmenu ul ul li a:hover {
  color: #ffffff;
}
#cssmenu ul ul li.has-sub > a:after {
  position: absolute;
  top: 16px;
  right: 11px;
  width: 8px;
  height: 2px;
  display: block;
  background: #dddddd;
  content: '';
}
#cssmenu.align-right ul ul li.has-sub > a:after {
  right: auto;
  left: 11px;
}
#cssmenu ul ul li.has-sub > a:before {
  position: absolute;
  top: 13px;
  right: 14px;
  display: block;
  width: 2px;
  height: 8px;
  background: #dddddd;
  content: '';
  -webkit-transition: all .25s ease;
  -moz-transition: all .25s ease;
  -ms-transition: all .25s ease;
  -o-transition: all .25s ease;
  transition: all .25s ease;
}
#cssmenu.align-right ul ul li.has-sub > a:before {
  right: auto;
  left: 14px;
}
#cssmenu ul ul > li.has-sub:hover > a:before {
  top: 17px;
  height: 0;
}
#cssmenu.small-screen {
  width: 100%;
}
#cssmenu.small-screen ul {
  width: 100%;
  display: none;
}
#cssmenu.small-screen.align-center > ul {
  text-align: left;
}
#cssmenu.small-screen ul li {
  width: 100%;
  border-top: 1px solid rgba(120, 120, 120, 0.2);
}
#cssmenu.small-screen ul ul li,
#cssmenu.small-screen li:hover > ul > li {
  height: auto;
}
#cssmenu.small-screen ul li a,
#cssmenu.small-screen ul ul li a {
  width: 100%;
  border-bottom: 0;
}
#cssmenu.small-screen > ul > li {
  float: none;
}
#cssmenu.small-screen ul ul li a {
  padding-left: 25px;
}
#cssmenu.small-screen ul ul ul li a {
  padding-left: 35px;
}
#cssmenu.small-screen ul ul li a {
  color: #dddddd;
  background: none;
}
#cssmenu.small-screen ul ul li:hover > a,
#cssmenu.small-screen ul ul li.active > a {
  color: #ffffff;
}
#cssmenu.small-screen ul ul,
#cssmenu.small-screen ul ul ul,
#cssmenu.small-screen.align-right ul ul {
  position: relative;
  left: 0;
  width: 100%;
  margin: 0;
  text-align: left;
}
#cssmenu.small-screen > ul > li.has-sub > a:after,
#cssmenu.small-screen > ul > li.has-sub > a:before,
#cssmenu.small-screen ul ul > li.has-sub > a:after,
#cssmenu.small-screen ul ul > li.has-sub > a:before {
  display: none;
}
#cssmenu.small-screen #menu-button {
  display: block;
  padding: 17px;
  color: #dddddd;
  cursor: pointer;
  font-size: 12px;
  text-transform: uppercase;
  font-weight: 700;
}
#cssmenu.small-screen #menu-button:after {
  position: absolute;
  top: 22px;
  right: 17px;
  display: block;
  height: 4px;
  width: 20px;
  border-top: 2px solid #dddddd;
  border-bottom: 2px solid #dddddd;
  content: '';
  box-sizing: content-box;
}
#cssmenu.small-screen #menu-button:before {
  position: absolute;
  top: 16px;
  right: 17px;
  display: block;
  height: 2px;
  width: 20px;
  background: #dddddd;
  content: '';
  box-sizing: content-box;
}
#cssmenu.small-screen #menu-button.menu-opened:after {
  top: 23px;
  border: 0;
  height: 2px;
  width: 15px;
  background: #ffffff;
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  -o-transform: rotate(45deg);
  transform: rotate(45deg);
}
#cssmenu.small-screen #menu-button.menu-opened:before {
  top: 23px;
  background: #ffffff;
  width: 15px;
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);
}
#cssmenu.small-screen .submenu-button {
  position: absolute;
  z-index: 99;
  right: 0;
  top: 0;
  display: block;
  border-left: 1px solid rgba(120, 120, 120, 0.2);
  height: 46px;
  width: 46px;
  cursor: pointer;
}
#cssmenu.small-screen .submenu-button.submenu-opened {
  background: #262626;
}
#cssmenu.small-screen ul ul .submenu-button {
  height: 34px;
  width: 34px;
}
#cssmenu.small-screen .submenu-button:after {
  position: absolute;
  top: 22px;
  right: 19px;
  width: 8px;
  height: 2px;
  display: block;
  background: #dddddd;
  content: '';
}
#cssmenu.small-screen ul ul .submenu-button:after {
  top: 15px;
  right: 13px;
}
#cssmenu.small-screen .submenu-button.submenu-opened:after {
  background: #ffffff;
}
#cssmenu.small-screen .submenu-button:before {
  position: absolute;
  top: 19px;
  right: 22px;
  display: block;
  width: 2px;
  height: 8px;
  background: #dddddd;
  content: '';
}
#cssmenu.small-screen ul ul .submenu-button:before {
  top: 12px;
  right: 16px;
}
#cssmenu.small-screen .submenu-button.submenu-opened:before {
  display: none;
}
#cssmenu.small-screen.select-list {
  padding: 5px;
}

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- jQuery -->
<script src="http://code.jquery.com/jquery-latest.min.js"></script>

<!-- MenuMaker Plugin -->
<script src="https://s3.amazonaws.com/menumaker/menumaker.min.js"></script>

<!-- Icon Library -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
<meta charset="UTF-8">
<title>Title</title>
</head>

<body>
<div id="cssmenu">
  <ul>
     <li><a href="#" target="_blank"><i class="fa fa-fw fa-home"></i> Home</a></li>
     <li><a href="#"><i class="fa fa-fw fa-bars"></i> Test</a>
        <ul>
           <li><a href="#">Hello</a></li>
           <li><a href="#">Hello 2</a></li>
           <li><a href="#">Hello 3</a></li>
        </ul>
     </li>
     <li><a href="#"><i class="fa fa-fw fa-cog"></i> Demo</a>
        <ul>
           <li><a href="#">Testing</a></li>
           <li><a href="#">New</a></li>
           <li><a href="#">Basic</a></li>
        </ul>
     </li>
     <li><a href="#"><i class="fa fa-fw fa-bullseye"></i> Other</a></li>
     <li><a href="#">Menu</a>
        <ul>
           <li><a href="#">Menu 1.1</a>
              <ul>
                 <li><a href="#">Menu 1.1.1</a>
                    <ul>
                       <li><a href="#">Menu 1.1.1.1</a></li>
                       <li><a href="#">Menu 1.1.1.2</a></li>
                       <li><a href="#">Menu 1.1.1.3</a></li>
                    </ul>
                 </li>
                 <li><a href="#">Menu 1.1.2</a></li>
                 <li><a href="#">Menu 1.1.3</a></li>
              </ul>
           </li>
           <li><a href="#">Menu 1.2</a>
              <ul>
                 <li><a href="#">Menu 1.2.1</a></li>
                 <li><a href="#">Menu 1.2.2</a></li>
                 <li><a href="#">Menu 1.2.3</a></li>
              </ul>
           </li>
           <li><a href="#">Menu 1.3</a>
              <ul>
                 <li><a href="#">Menu 1.3.1</a></li>
                 <li><a href="#">Menu 1.3.2</a></li>
                 <li><a href="#">Menu 1.3.3</a></li>
              </ul>
           </li>
           <li><a href="#">Menu 1.4</a>
              <ul>
                 <li><a href="#">Menu 1.4.1</a>
                    <ul>
                       <li><a href="#">Menu 1.4.1.1</a></li>
                       <li><a href="#">Menu 1.4.1.2</a></li>
                    </ul>
                 </li>
                 <li><a href="#">Menu 1.4.2</a></li>
              </ul>
           </li>
        </ul>
     </li>
  </ul>
</div>
</body>

</html>