javascript - 自动关闭切换菜单的ul

标签 javascript jquery html css

在切换菜单栏中，我试图实现当用户在菜单之间切换时自动关闭菜单。

也就是说，点击一个新的菜单区域应该隐藏/关闭已经打开(显示)的菜单区域。我尝试了一些方法来隐藏它，但没有成功。

如何实现？代码包含在下面。

代码:

function toggle(element) {
  const nodes = getChildNodes(element.parentElement);
  if(nodes[1].style.display === 'block') {
    nodes[1].style.display = 'none';
  } else {
    nodes[1].style.display = 'block';
  }
}

function getChildNodes(node) {
  let children = new Array();
  for(const child in node.childNodes) {
    if(node.childNodes[child].nodeType == 1) {
      children.push(node.childNodes[child]);
    }
  }
  return children;
}
#ABT-Container  {
  font-family: 'Roboto', sans-serif;
  background: transparent;
  width:100%; float:right;
}

a {
  text-align: center;
  font-family: 'Roboto', sans-serif;
  color: #333;
}

#nav {
  float: right;
  font-family: 'Roboto', sans-serif;
  padding: 2px 6px 0;
  line-height: 100%;
  border-radius: 1em;
  background: white; /* for non-css3 browsers */
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#FFFFFF', endColorstr='#FFFFFF'); /* for IE */
  background: -webkit-gradient(linear, right top, right bottom, from(#FFFFFF), to(#FFFFFF)); /* for webkit browsers */
  background: -moz-linear-gradient(top,  #FFFFFF,  #FFFFFF); /* for firefox 3.6+ */
  border: solid 1px white;
}

#nav .current a, #nav li:hover > a {
	font-family: 'Roboto', sans-serif;
    background: white; /* for non-css3 browsers */
    filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#FFFFFF', endColorstr='#FFFFFF'); /* for IE */
    background: -webkit-gradient(linear, right top, right bottom, from(#FFFFFF), to(#FFFFFF)); /* for webkit browsers */
    background: -moz-linear-gradient(top,  #FFFFFF,  #FFFFFF); /* for firefox 3.6+ */

    color: #444;
    border-top: solid 1px #FFFFFF;
    /*-webkit-box-shadow: 0 1px 1px rgba(0, 0, 0, .2);
    -moz-box-shadow: 0 1px 1px rgba(0, 0, 0, .2);
    box-shadow: 0 1px 1px rgba(0, 0, 0, .2);
    text-shadow: 0 1px 0 rgba(255, 255, 255, .8);*/
}
/* sub levels link hover */
#nav ul li:hover a, #nav li:hover li a {
	font-family: 'Roboto', sans-serif;
    background: none;
    border: none;
    color: #666;
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
}
#nav ul a:hover {
	font-family: 'Roboto', sans-serif;
    background: #ff4718 !important; /* for non-css3 browsers */
    filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff4718', endColorstr='#FF0000'); /* for IE */
    background: -webkit-gradient(linear, right top, right bottom, from(#ff4718), to(#FF0000)) !important; /* for webkit browsers */
    background: -moz-linear-gradient(top,  #ff4718,  #FF0000) !important; /* for firefox 3.6+ */

    color: #fff !important;
    -webkit-border-radius: 0;
    -moz-border-radius: 0;
    text-shadow: 0 1px 1px rgba(0, 0, 0, .1);
}


#nav li {
  font-family: 'Roboto', sans-serif;
  margin: 0 5px;
  padding: 0 0 8px;
  float: right;
  position: relative;
  list-style: none;
}

/* main level link */
#nav a {
  font-family: 'Roboto', sans-serif;
  color: #353535;
  text-decoration: none;
  display: block;
  padding:  8px 20px;
  margin: 0;
  -webkit-border-radius: 0em;
  -moz-border-radius: 0em;
  text-shadow: 0 0px 0px rgba(0, 0, 0, .3);
}

/* level 2 list */
#nav ul {
  font-family: 'Roboto', sans-serif;
  background: #FFFFFF; /* for non-css3 browsers */
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#FFFFFF'); /* for IE */
  background: -webkit-gradient(linear, right top, right bottom, from(#fff), to(#FFFFFF)); /* for webkit browsers */
  background: -moz-linear-gradient(top,  #fff,  #FFFFFF); /* for firefox 3.6+ */
  display: none;
  margin: 0;
  padding: 0;
  width: 185px;
  position: absolute;
  top: 35px;
  right: 0;
  -webkit-border-radius: 1px;
  -moz-border-radius: 1px;
  border-radius: 1px;
  -webkit-box-shadow: 0 1px 1px rgba(0, 0, 0, .8);
  -moz-box-shadow: 0 1px 1px rgba(0, 0, 0, .8);
  box-shadow: 0 1px 1px rgba(0, 0, 0, .8);
}

/* dropdown */
#nav ul li {
  font-family: 'Roboto', sans-serif;
  float: none;
  margin: 0;
  padding: 0;
}

#nav ul a {
  font-family: 'Roboto', sans-serif;
  font-weight: normal;
  text-shadow: 0 1px 1px rgba(255, 255, 255, .9);
}

/* level 3+ list */
#nav ul ul {
  font-family: 'Roboto', sans-serif;
  right: 181px;
  top: -3px;
}

/* rounded corners for first and last child */
#nav ul li:first-child > a {
  -webkit-border-top-right-radius: 1px;
  -moz-border-radius-topleft: 1px;
  -webkit-border-top-left-radius: 1px;
  -moz-border-radius-topright: 1px;
}

#nav ul li:last-child > a {
  -webkit-border-bottom-right-radius: 1px;
  -moz-border-radius-bottomleft: 1px;
  -webkit-border-bottom-left-radius: 1px;
  -moz-border-radius-bottomright: 1px;
}

/* clearfix */
#nav:after {
  font-family: 'Roboto', sans-serif;
  content: ".";
  display: block;
  clear: both;
  visibility: hidden;
  line-height: 0;
  height: 0;
}

#nav {
  font-family: 'Roboto', sans-serif;
  display: inline-block;
}

html[xmlns] #nav {
  font-family: 'Roboto', sans-serif;
  display: block;
}

* html #nav {
  height: 1%;
}

.menu_line{
  width: 25px;
  height: 2px;
  background-color: black;
  color: black;
  margin: 4px 0;
}

.expand{font-size:24px;float: left;margin: 0px -5px;}

.menu_line{
	width: 25px;
    height: 2px;
    background-color: black;
	color: black;
    margin: 4px 0;
}
#ABT-Container  {
  font-family: 'Roboto', sans-serif;
  background: transparent;
  width:100%; float:right;
}

a {
  text-align: center;
  font-family: 'Roboto', sans-serif;
  color: #333;
}

#nav {
  float: right;
  font-family: 'Roboto', sans-serif;
  padding: 2px 6px 0;
  line-height: 100%;
  border-radius: 1em;
  background: white; /* for non-css3 browsers */
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#FFFFFF', endColorstr='#FFFFFF'); /* for IE */
  background: -webkit-gradient(linear, right top, right bottom, from(#FFFFFF), to(#FFFFFF)); /* for webkit browsers */
  background: -moz-linear-gradient(top,  #FFFFFF,  #FFFFFF); /* for firefox 3.6+ */
  border: solid 1px white;
}

#nav .current a, #nav li:hover > a {
	font-family: 'Roboto', sans-serif;
    background: white; /* for non-css3 browsers */
    filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#FFFFFF', endColorstr='#FFFFFF'); /* for IE */
    background: -webkit-gradient(linear, right top, right bottom, from(#FFFFFF), to(#FFFFFF)); /* for webkit browsers */
    background: -moz-linear-gradient(top,  #FFFFFF,  #FFFFFF); /* for firefox 3.6+ */

    color: #444;
    border-top: solid 1px #FFFFFF;
    /*-webkit-box-shadow: 0 1px 1px rgba(0, 0, 0, .2);
    -moz-box-shadow: 0 1px 1px rgba(0, 0, 0, .2);
    box-shadow: 0 1px 1px rgba(0, 0, 0, .2);
    text-shadow: 0 1px 0 rgba(255, 255, 255, .8);*/
}
/* sub levels link hover */
#nav ul li:hover a, #nav li:hover li a {
	font-family: 'Roboto', sans-serif;
    background: none;
    border: none;
    color: #666;
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
}
#nav ul a:hover {
	font-family: 'Roboto', sans-serif;
    background: #ff4718 !important; /* for non-css3 browsers */
    filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff4718', endColorstr='#FF0000'); /* for IE */
    background: -webkit-gradient(linear, right top, right bottom, from(#ff4718), to(#FF0000)) !important; /* for webkit browsers */
    background: -moz-linear-gradient(top,  #ff4718,  #FF0000) !important; /* for firefox 3.6+ */

    color: #fff !important;
    -webkit-border-radius: 0;
    -moz-border-radius: 0;
    text-shadow: 0 1px 1px rgba(0, 0, 0, .1);
}


#nav li {
  font-family: 'Roboto', sans-serif;
  margin: 0 5px;
  padding: 0 0 8px;
  float: right;
  position: relative;
  list-style: none;
}

/* main level link */
#nav a {
  font-family: 'Roboto', sans-serif;
  color: #353535;
  text-decoration: none;
  display: block;
  padding:  8px 20px;
  margin: 0;
  -webkit-border-radius: 0em;
  -moz-border-radius: 0em;
  text-shadow: 0 0px 0px rgba(0, 0, 0, .3);
}

/* level 2 list */
#nav ul {
  font-family: 'Roboto', sans-serif;
  background: #FFFFFF; /* for non-css3 browsers */
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#FFFFFF'); /* for IE */
  background: -webkit-gradient(linear, right top, right bottom, from(#fff), to(#FFFFFF)); /* for webkit browsers */
  background: -moz-linear-gradient(top,  #fff,  #FFFFFF); /* for firefox 3.6+ */
  display: none;
  margin: 0;
  padding: 0;
  width: 185px;
  position: absolute;
  top: 35px;
  right: 0;
  -webkit-border-radius: 1px;
  -moz-border-radius: 1px;
  border-radius: 1px;
  -webkit-box-shadow: 0 1px 1px rgba(0, 0, 0, .8);
  -moz-box-shadow: 0 1px 1px rgba(0, 0, 0, .8);
  box-shadow: 0 1px 1px rgba(0, 0, 0, .8);
}

/* dropdown */
#nav ul li {
  font-family: 'Roboto', sans-serif;
  float: none;
  margin: 0;
  padding: 0;
}

#nav ul a {
  font-family: 'Roboto', sans-serif;
  font-weight: normal;
  text-shadow: 0 1px 1px rgba(255, 255, 255, .9);
}

/* level 3+ list */
#nav ul ul {
  font-family: 'Roboto', sans-serif;
  right: 181px;
  top: -3px;
}

/* rounded corners for first and last child */
#nav ul li:first-child > a {
  -webkit-border-top-right-radius: 1px;
  -moz-border-radius-topleft: 1px;
  -webkit-border-top-left-radius: 1px;
  -moz-border-radius-topright: 1px;
}

#nav ul li:last-child > a {
  -webkit-border-bottom-right-radius: 1px;
  -moz-border-radius-bottomleft: 1px;
  -webkit-border-bottom-left-radius: 1px;
  -moz-border-radius-bottomright: 1px;
}

/* clearfix */
#nav:after {
  font-family: 'Roboto', sans-serif;
  content: ".";
  display: block;
  clear: both;
  visibility: hidden;
  line-height: 0;
  height: 0;
}

#nav {
  font-family: 'Roboto', sans-serif;
  display: inline-block;
}

html[xmlns] #nav {
  font-family: 'Roboto', sans-serif;
  display: block;
}

* html #nav {
  height: 1%;
}

.menu_line{
  width: 25px;
  height: 2px;
  background-color: black;
  color: black;
  margin: 4px 0;
}

.expand{font-size:24px;float: left;margin: 0px -5px;}

.menu_line{
	width: 25px;
    height: 2px;
    background-color: black;
	color: black;
    margin: 4px 0;
}
<nav id="bg1" class="navbar">                  
<div id="ABT-Container">
<ul id="nav"><li class="w3-animate-right"><a href="#" onclick="toggle(this)"><p class="menu_line"></p><p class="menu_line"></p><p class="menu_line"></p></a>
<ul>
<li class="w3-animate-right"><a href="#" onclick="toggle(this)"><span class="expand">&#x25C2;</span>Our Technology</a>
<ul>
<li class="w3-animate-right"><a href="#" onclick="toggle(this)"><span class="expand">&#x25C2;</span>Sub-Row</a>
<ul>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub Sub-Row 1 clicked')">Sub Sub-Row 1</a></li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub Sub-Row 1 clicked')">Sub Sub-Row 1</a></li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub Sub-Row 1 clicked')">Sub Sub-Row 1</a></li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub Sub-Row 1 clicked')">Sub Sub-Row 1</a></li>
</a></li></ul>
</li>
<li class="w3-animate-right"><a href="#" onclick="toggle(this)"><span class="expand">&#x25C2;</span>Sub-Row</a>
<ul>
               
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub Sub-Row 2 clicked')">Sub Sub-Row 2</a></li>
</ul>
</li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub Sub-Row clicked')">Sub-Row</a></li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub Sub-Row clicked')">Sub-Row</a></li>
</ul>
</li>

<li class="w3-animate-right"><a href="#" onclick="toggle(this)"><span class="expand">&#x25C2;</span>Multi-Levels</a>
<ul>
<li class="w3-animate-right"><a href="#" onclick="console.log('Team clicked')">Team</a>
<ul>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub-Level Item 1 clicked')">Sub-Level Item 1</a></li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub-Level Item 1 clicked')">Sub-Level Item 1</a>
<ul>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub-Level Item 11 clicked')">Sub-Level Item 11</a></li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub-Level Item 22 clicked')">Sub-Level Item 22</a></li>
<li><a href="#" onclick="console.log('Sub-Level Item 33 clicked')">Sub-Level Item 33</a></li>
</ul>
</li>
                   
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub-Level Item 1 clicked')">Sub-Level Item 1</a></li>
</ul>
</li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub-Level Sales clicked')">Sales</a></li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Another Link clicked')">Another Link</a></li>
<li class="w3-animate-right"><a href="#" onclick="toggle(this)"><span class="expand">&#x25C2;</span>Department</a>
<ul>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub-Level Item 2 clicked')">Sub-Level Item 2</a></li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub-Level Item 2 clicked')">Sub-Level Item 2</a></li>
<li class="w3-animate-right"><a href="#" onclick="console.log('Sub-Level Item 2 clicked')">Sub-Level Item 2</a></li>
</ul>
</li>
</ul>
</li><li class="w3-animate-right"><a href="#">Services</a></li>   
<li class="w3-animate-right"><a href="#">About US</a></li>
<li class="w3-animate-right"><a href="#">Contact US</a></li>
<li class="w3-animate-right"><a href="#">Our Links</a></li>
</li>
</ul>
</ul>

</ul>
</div>
                    <!-- Header Nav End -->
                    
            </nav>

最佳答案

@edit previous jsbin link wss 错误，这应该是这里正确的bin示例:

https://jsbin.com/metavuq/edit?html,css,js,output

文档必须知道您正在单击外部菜单。虽然有多种方法可以实现这一点，但我认为这是最简单的。

将此 id 添加到您的标记中(在您的内部 ul 中)，以便您可以更轻松地使用 js 定位它，如下所示:

<ul id="dropdown">
 <!-- contents -->
</ul>

然后创建一个事件监听器，它将监听不是您的导航元素的任何地方的点击，如下所示:

document.addEventListener('click', function(event) {
  if (event.target.closest('#nav')) {
    return;
  } else {
   document.querySelector('#dropdown').style.display = 'none';  
  }
});

此事件监听器监听文档上的点击并在点击超出指定区域时执行所需的操作。

关于javascript - 自动关闭切换菜单的ul，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52877981/

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