当它不是点击目标时，子菜单不会隐藏

Question

我一直在努力修复这个简单问题。当其他元素被点击时，我的一个导航菜单的选项卡的子菜单应该是关闭的，但它不会关闭。

var query = document.querySelector.bind(document); 
 

 
query('.drop-down').onclick = function() { 
 
    query('.sub-menu').classList.toggle('nav-show'); 
 
} 
 

 
window.onclick = function(e) { 
 
    if (query('.sub-menu').style.display == 'block') { 
 
    if (e.target != query('.sub-menu')) { 
 
     query('.sub-menu').classList.remove('nav-show'); 
 
    } 
 
    } 
 
}

.menu { 
 
    display: table; 
 
    background: #f9f8f8; 
 
    padding: 0; 
 
    margin: 5em auto; 
 
    border-radius: 0.5em; 
 
    box-shadow: 0 3px 8px -5px rgba(0, 0, 0, 0.8); 
 
} 
 
.menu > li { 
 
    display: table-cell; 
 
    width: 100px; 
 
    list-style: none; 
 
    text-align: center; 
 
} 
 
.menu > li.drop-down { 
 
    position: relative; 
 
} 
 
.menu > li > a { 
 
    display: block; 
 
    text-decoration: none; 
 
    color: #9c9c9f; 
 
    padding: .8em; 
 
    font: 1em Arial, sans-serif; 
 
} 
 
.menu > li > a:hover { 
 
    color: #757579; 
 
} 
 
.sub-menu { 
 
    position: absolute; 
 
    padding: 0; 
 
    top: 100%; 
 
    right: 0; 
 
    left: 0; 
 
    background: #f9f8f8; 
 
    border: 1px solid #f1f1f1; 
 
    box-shadow: 0 3px 8px -5px rgba(0, 0, 0, 0.8); 
 
    display: none; 
 
} 
 
.sub-menu.nav-show { 
 
    display: block; 
 
} 
 
.sub-menu > li { 
 
    list-style: none; 
 
    display: block; 
 
    text-align: center; 
 
} 
 
.sub-menu > li:not(:first-child) { 
 
    border-top: 1px solid #f1f1f1; 
 
} 
 
.sub-menu > li > a { 
 
    text-decoration: none; 
 
    display: block; 
 
    font: 0.9em Arial, sans-serif; 
 
    color: #9c9c9f; 
 
    padding: 1em 0; 
 
} 
 
.sub-menu > li > a:hover { 
 
    background: white; 
 
}

<ul class="menu"> 
 
    <li><a href="" onclick="return false">Home</a> 
 
    </li> 
 
    <li class="drop-down"><a href="" onclick="return false">Projects</a> 
 
    <ul class="sub-menu"> 
 
     <li><a href="/">HTML</a> 
 
     </li> 
 
     <li><a href="/">CSS3</a> 
 
     </li> 
 
     <li><a href="/">JavaScript</a> 
 
     </li> 
 
     <li><a href="/">PHP</a> 
 
     </li> 
 
    </ul> 
 
    </li> 
 
    <li><a href="" onclick="return false">Forums</a> 
 
    </li> 
 
    <li><a href="" onclick="return false">Blog</a> 
 
    </li> 
 
</ul>

有人可以帮助我解决这个问题？

Answer 1

您将需要stopPropagation() method来防止执行任何父事件处理程序。 有关更多信息，请参阅w3 wiki。

这里有一个简单的例子使用jQuery：

$(".drop-down").click(function(e) { 
 
    e.stopPropagation(); 
 
    $('.sub-menu').toggleClass('nav-show'); 
 
}); 
 

 
$(document).click(function(e) { 
 
    $('.sub-menu').removeClass('nav-show'); 
 
});

.menu { 
 
    display: table; 
 
    background: #f9f8f8; 
 
    padding: 0; 
 
    margin: 5em auto; 
 
    border-radius: 0.5em; 
 
    box-shadow: 0 3px 8px -5px rgba(0, 0, 0, 0.8); 
 
} 
 
.menu > li { 
 
    display: table-cell; 
 
    width: 100px; 
 
    list-style: none; 
 
    text-align: center; 
 
} 
 
.menu > li.drop-down { 
 
    position: relative; 
 
} 
 
.menu > li > a { 
 
    display: block; 
 
    text-decoration: none; 
 
    color: #9c9c9f; 
 
    padding: .8em; 
 
    font: 1em Arial, sans-serif; 
 
} 
 
.menu > li > a:hover { 
 
    color: #757579; 
 
} 
 
.sub-menu { 
 
    position: absolute; 
 
    padding: 0; 
 
    top: 100%; 
 
    right: 0; 
 
    left: 0; 
 
    background: #f9f8f8; 
 
    border: 1px solid #f1f1f1; 
 
    box-shadow: 0 3px 8px -5px rgba(0, 0, 0, 0.8); 
 
    display: none; 
 
} 
 
.sub-menu.nav-show { 
 
    display: block; 
 
} 
 
.sub-menu > li { 
 
    list-style: none; 
 
    display: block; 
 
    text-align: center; 
 
} 
 
.sub-menu > li:not(:first-child) { 
 
    border-top: 1px solid #f1f1f1; 
 
} 
 
.sub-menu > li > a { 
 
    text-decoration: none; 
 
    display: block; 
 
    font: 0.9em Arial, sans-serif; 
 
    color: #9c9c9f; 
 
    padding: 1em 0; 
 
} 
 
.sub-menu > li > a:hover { 
 
    background: white; 
 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<ul class="menu"> 
 
    <li><a href="" onclick="return false">Home</a> 
 
    </li> 
 
    <li class="drop-down"><a href="" onclick="return false">Projects</a> 
 
    <ul class="sub-menu"> 
 
     <li><a href="/">HTML</a> 
 
     </li> 
 
     <li><a href="/">CSS3</a> 
 
     </li> 
 
     <li><a href="/">JavaScript</a> 
 
     </li> 
 
     <li><a href="/">PHP</a> 
 
     </li> 
 
    </ul> 
 
    </li> 
 
    <li><a href="" onclick="return false">Forums</a> 
 
    </li> 
 
    <li><a href="" onclick="return false">Blog</a> 
 
    </li> 
 
</ul>