javascript - 无法让这个 JavaScript 在我的下拉菜单上工作

Question

仍在处理那个下拉菜单。它在大多数情况下都有效，但我需要应用相同的效果(加载时关闭，单击时打开)以应用于嵌套的 <ul>的。我已经尝试了一大堆东西，目前我尝试将相同的脚本应用于嵌套的 <ul>因为我申请了初始 <ul> ，但它什么都不做。它以未折叠状态打开，并且在单击时没有正确响应。我做错了什么吗？

这是我的代码:

var dropdown = document.querySelectorAll('.dropdown');
var dropdownArray = Array.prototype.slice.call(dropdown, 0);
dropdownArray.forEach(function (el) {
    var button = el.querySelector('a[data-toggle="dropdown"]'), menu = el.querySelector('.dropdown-menu'), arrow = button.querySelector('i.icon-arrow');
    button.onclick = function (event) {
        if (!menu.hasClass('show')) {
            menu.classList.add('show');
            menu.classList.remove('hide');
            arrow.classList.add('open');
            arrow.classList.remove('close');
            event.preventDefault();
        } else {
            menu.classList.remove('show');
            menu.classList.add('hide');
            arrow.classList.remove('open');
            arrow.classList.add('close');
            event.preventDefault();
        }
    };
});
Element.prototype.hasClass = function (className) {
    return this.className && new RegExp('(^|\\s)' + className + '(\\s|$)').test(this.className);
};

@charset "utf-8";

body {
  font-family: "Lato", Helvetica, Arial;
  font-size: 16px;
}

.text-center {
  text-align: center;
}

*, *:before, *:after {
  -webkit-border-sizing: border-box;
  -moz-border-sizing: border-box;
  border-sizing: border-box;
}

.container {
  width: 350px;
  margin: 50px auto;
}
.container > ul {
  list-style: none;
  padding: 0;
  margin: 0 0 20px 0;
}

.title {
  font-family: 'Pacifico';
  font-weight: normal;
  font-size: 40px;
  text-align: center;
  line-height: 1.4;
  color: #2980B9;
}

.dropdown a {
  text-decoration: none;
}
.dropdown [data-toggle="dropdown"] {
  position: relative;
  display: block;
  color: black;
  background: #E6E6E6;
  -moz-box-shadow: 0 1px 0 #EDEDED inset, 0 -1px 0 #C0C0C0 inset;
  -webkit-box-shadow: 0 1px 0 #EDEDED inset, 0 -1px 0 #C0C0C0 inset;
  box-shadow: 0 1px 0 #EDEDED inset, 0 -1px 0 #C0C0C0 inset;
  text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.3);
  padding: 10px;
}
.dropdown [data-toggle="dropdown"]:hover {
  background: #C0C0C0;
}
.dropdown .icon-arrow {
  position: absolute;
  display: block;
  font-size: 0.7em;
  color: #fff;
  top: 14px;
  right: 10px;
}
.dropdown .icon-arrow.open {
  -moz-transform: rotate(-180deg);
  -ms-transform: rotate(-180deg);
  -webkit-transform: rotate(-180deg);
  transform: rotate(-180deg);
  -moz-transition: -moz-transform 0.6s;
  -o-transition: -o-transform 0.6s;
  -webkit-transition: -webkit-transform 0.6s;
  transition: transform 0.6s;
}
.dropdown .icon-arrow.close {
  -moz-transform: rotate(0deg);
  -ms-transform: rotate(0deg);
  -webkit-transform: rotate(0deg);
  transform: rotate(0deg);
  -moz-transition: -moz-transform 0.6s;
  -o-transition: -o-transform 0.6s;
  -webkit-transition: -webkit-transform 0.6s;
  transition: transform 0.6s;
}
.dropdown .icon-arrow:before {
  content: '\25BC';
}
.dropdown .dropdown-menu {
  max-height: 0;
  overflow: hidden;
  list-style: none;
  padding: 0;
  margin: 0;
}
.dropdown .dropdown-menu li {
  padding: 0;
}
.dropdown .dropdown-menu li a {
  display: block;
  color: #6e6e6e;
  background: #EEE;
  -moz-box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
  -webkit-box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
  box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
  text-shadow: 0 -1px 0 rgba(255, 255, 255, 0.3);
  padding: 10px 10px;
}

.dropdown .dropdown-menu li a:hover {
  background: #f6f6f6;
}

.dropdown .dropdown-menu li ul li {
  display: block;
  color: #6e6e6e;
  background: #EEE;
  -moz-box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
  -webkit-box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
  box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
  text-shadow: 0 -1px 0 rgba(255, 255, 255, 0.3);
  padding: 0px 0px;
  text-decoration:none;
  font-size:80%;
  
}

.dropdown .dropdown-menu li ul li a{
  display: block;
  color: #6e6e6e;
  background: #EEE;
  -moz-box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
  -webkit-box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
  box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
  text-shadow: 0 -1px 0 rgba(255, 255, 255, 0.3);
  padding: 10px 10px;
  text-decoration:none;
}

.dropdown .dropdown-menu li ul li a:hover {
  background: #f6f6f6;
}

.dropdown .show, .dropdown .hide {
  -moz-transform-origin: 50% 0%;
  -ms-transform-origin: 50% 0%;
  -webkit-transform-origin: 50% 0%;
  transform-origin: 50% 0%;
}
.dropdown .show {
  display: block;
  max-height: 9999px;
  -moz-transform: scaleY(1);
  -ms-transform: scaleY(1);
  -webkit-transform: scaleY(1);
  transform: scaleY(1);
  animation: showAnimation 0.5s ease-in-out;
  -moz-animation: showAnimation 0.5s ease-in-out;
  -webkit-animation: showAnimation 0.5s ease-in-out;
  -moz-transition: max-height 1s ease-in-out;
  -o-transition: max-height 1s ease-in-out;
  -webkit-transition: max-height 1s ease-in-out;
  transition: max-height 1s ease-in-out;
}
.dropdown .hide {
  max-height: 0;
  -moz-transform: scaleY(0);
  -ms-transform: scaleY(0);
  -webkit-transform: scaleY(0);
  transform: scaleY(0);
  animation: hideAnimation 0.4s ease-out;
  -moz-animation: hideAnimation 0.4s ease-out;
  -webkit-animation: hideAnimation 0.4s ease-out;
  -moz-transition: max-height 0.6s ease-out;
  -o-transition: max-height 0.6s ease-out;
  -webkit-transition: max-height 0.6s ease-out;
  transition: max-height 0.6s ease-out;
}

@keyframes showAnimation {
  0% {
    -moz-transform: scaleY(0.1);
    -ms-transform: scaleY(0.1);
    -webkit-transform: scaleY(0.1);
    transform: scaleY(0.1);
  }
  40% {
    -moz-transform: scaleY(1.04);
    -ms-transform: scaleY(1.04);
    -webkit-transform: scaleY(1.04);
    transform: scaleY(1.04);
  }
  60% {
    -moz-transform: scaleY(0.98);
    -ms-transform: scaleY(0.98);
    -webkit-transform: scaleY(0.98);
    transform: scaleY(0.98);
  }
  80% {
    -moz-transform: scaleY(1.04);
    -ms-transform: scaleY(1.04);
    -webkit-transform: scaleY(1.04);
    transform: scaleY(1.04);
  }
  100% {
    -moz-transform: scaleY(0.98);
    -ms-transform: scaleY(0.98);
    -webkit-transform: scaleY(0.98);
    transform: scaleY(0.98);
  }
  80% {
    -moz-transform: scaleY(1.02);
    -ms-transform: scaleY(1.02);
    -webkit-transform: scaleY(1.02);
    transform: scaleY(1.02);
  }
  100% {
    -moz-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
}
@-moz-keyframes showAnimation {
  0% {
    -moz-transform: scaleY(0.1);
    -ms-transform: scaleY(0.1);
    -webkit-transform: scaleY(0.1);
    transform: scaleY(0.1);
  }
  40% {
    -moz-transform: scaleY(1.04);
    -ms-transform: scaleY(1.04);
    -webkit-transform: scaleY(1.04);
    transform: scaleY(1.04);
  }
  60% {
    -moz-transform: scaleY(0.98);
    -ms-transform: scaleY(0.98);
    -webkit-transform: scaleY(0.98);
    transform: scaleY(0.98);
  }
  80% {
    -moz-transform: scaleY(1.04);
    -ms-transform: scaleY(1.04);
    -webkit-transform: scaleY(1.04);
    transform: scaleY(1.04);
  }
  100% {
    -moz-transform: scaleY(0.98);
    -ms-transform: scaleY(0.98);
    -webkit-transform: scaleY(0.98);
    transform: scaleY(0.98);
  }
  80% {
    -moz-transform: scaleY(1.02);
    -ms-transform: scaleY(1.02);
    -webkit-transform: scaleY(1.02);
    transform: scaleY(1.02);
  }
  100% {
    -moz-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
}
@-webkit-keyframes showAnimation {
  0% {
    -moz-transform: scaleY(0.1);
    -ms-transform: scaleY(0.1);
    -webkit-transform: scaleY(0.1);
    transform: scaleY(0.1);
  }
  40% {
    -moz-transform: scaleY(1.04);
    -ms-transform: scaleY(1.04);
    -webkit-transform: scaleY(1.04);
    transform: scaleY(1.04);
  }
  60% {
    -moz-transform: scaleY(0.98);
    -ms-transform: scaleY(0.98);
    -webkit-transform: scaleY(0.98);
    transform: scaleY(0.98);
  }
  80% {
    -moz-transform: scaleY(1.04);
    -ms-transform: scaleY(1.04);
    -webkit-transform: scaleY(1.04);
    transform: scaleY(1.04);
  }
  100% {
    -moz-transform: scaleY(0.98);
    -ms-transform: scaleY(0.98);
    -webkit-transform: scaleY(0.98);
    transform: scaleY(0.98);
  }
  80% {
    -moz-transform: scaleY(1.02);
    -ms-transform: scaleY(1.02);
    -webkit-transform: scaleY(1.02);
    transform: scaleY(1.02);
  }
  100% {
    -moz-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
}
@keyframes hideAnimation {
  0% {
    -moz-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
  60% {
    -moz-transform: scaleY(0.98);
    -ms-transform: scaleY(0.98);
    -webkit-transform: scaleY(0.98);
    transform: scaleY(0.98);
  }
  80% {
    -moz-transform: scaleY(1.02);
    -ms-transform: scaleY(1.02);
    -webkit-transform: scaleY(1.02);
    transform: scaleY(1.02);
  }
  100% {
    -moz-transform: scaleY(0);
    -ms-transform: scaleY(0);
    -webkit-transform: scaleY(0);
    transform: scaleY(0);
  }
}
@-moz-keyframes hideAnimation {
  0% {
    -moz-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
  60% {
    -moz-transform: scaleY(0.98);
    -ms-transform: scaleY(0.98);
    -webkit-transform: scaleY(0.98);
    transform: scaleY(0.98);
  }
  80% {
    -moz-transform: scaleY(1.02);
    -ms-transform: scaleY(1.02);
    -webkit-transform: scaleY(1.02);
    transform: scaleY(1.02);
  }
  100% {
    -moz-transform: scaleY(0);
    -ms-transform: scaleY(0);
    -webkit-transform: scaleY(0);
    transform: scaleY(0);
  }
}
@-webkit-keyframes hideAnimation {
  0% {
    -moz-transform: scaleY(1);
    -ms-transform: scaleY(1);
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
  60% {
    -moz-transform: scaleY(0.98);
    -ms-transform: scaleY(0.98);
    -webkit-transform: scaleY(0.98);
    transform: scaleY(0.98);
  }
  80% {
    -moz-transform: scaleY(1.02);
    -ms-transform: scaleY(1.02);
    -webkit-transform: scaleY(1.02);
    transform: scaleY(1.02);
  }
  100% {
    -moz-transform: scaleY(0);
    -ms-transform: scaleY(0);
    -webkit-transform: scaleY(0);
    transform: scaleY(0);
  }
}

<!DOCTYPE html><html class="">
<head>
<meta charset="UTF-8">
<link rel="stylesheet" type="text/css" href="dropstyle.css"/>
</head>

<body>
<div class="container">
  <h1 class="title">Dropdown Menu</h1>
  <ul>
    <li class="dropdown">
      <a href="#" data-toggle="dropdown">Ga naar... <i class="icon-arrow"></i></a>
      <ul class="dropdown-menu">
        <li><a href="#" data-toggle="dropdown">Webdesign</a>
                 <ul>
                        <li><a href="http://www.breunesse-ict.nl/web-design/eigen-website/">Website</a></li>
                        <li><a href="http://www.breunesse-ict.nl/cms/">CMS</a></li>
                        <li><a href="http://www.breunesse-ict.nl/portfolio/">Portfolio</a></li>
                  </ul>
         </li>
          <li><a href="#" data-toggle="dropdown">Verkoop</a>
             <ul>
                        <li><a href="http://www.breunesse-ict.nl/verkoop/computer-laptops">Computers & laptops</a></li>
                        <li><a href="http://www.breunesse-ict.nl/verkoop/bullguard-virusscanner-backup">Bullguard anti-virus & backup</a></li>
             </ul>
          </li>
          <li><a href="http://www.breunesse-ict.nl/reparatie/">Reparatie</a></li>
          <li><a href="#" data-toggle="dropdown">Google diensten</a>
              <ul>	
                        <li><a href="http://www.breunesse-ict.nl/google-diensten/adwords">Adwords</a></li>
                        <li><a href="http://www.breunesse-ict.nl/google-diensten/drive">Drive</a></li>            
              </ul>		
          </li>
          <li><a href="#" data-toggle="dropdown">Glasvezel</a>
              <ul>
                        <li><a href="http://www.breunesse-ict.nl/glasvezel-baarn/introductie">Introductie</a></li>
                        <li><a href="http://www.breunesse-ict.nl/glasvezel-baarn/waarom">Waarom</a></li>   
                        <li><a href="http://www.breunesse-ict.nl/glasvezel-baarn/techniek">Techniek</a></li>
                        <li><a href="http://www.breunesse-ict.nl/glasvezel-baarn/aanmelden">Aanmelden</a></li>
              </ul>
          </li>
          <li><a href="http://www.breunesse-ict.nl/nieuws-overzicht/">Nieuws</a></li>
          <li><a href="http://www.breunesse-ict.nl/contact/">Contact</a></li>
      </ul>
    </li>
  </ul>
</div>
<script src="dropscript.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
</body></html>

Answer 1

尝试将 dropdown、dropdown-menu 类也添加到子下拉结构中，并在那里也包含箭头。好像不见了。所以现在这正在发生:

• 你只得到开头的第一个 li。
• 您只查询其中的第一个a，并且只查询第一个ul。
• 因此您只在第一级处理点击和下拉菜单。

这是您更新的 fiddle :http://jsfiddle.net/gdna2ncq/1/