如何使用点击功能打开子菜单并使用点击功能隐藏

Question

>我做了一个侧边栏导航，我这样做了，所以鼠标悬停打开子菜单，但我希望它在单击时打开并单击同一选项卡以隐藏它。请检查我在此代码笔中的代码谢谢。

<nav class="navigation">
  <ul class="mainmenu">
    <li><a href="">Home</a></li>
    <li><a href="">About</a></li>
    <li><a href="">Products</a>
      <ul class="submenu">
        <li><a href="">Tops</a></li>
        <li><a href="">Bottoms</a></li>
        <li><a href="">Footwear</a></li>
      </ul>
    </li>
      <li><a href="">Contact us</a></li>
  </ul>
</nav>

https://codepen.io/anon/pen/erNpYG

提前谢谢。

Answer 1

您可以使用带有一般同级组合器 ( ~ ( 的隐藏复选框，在没有 javascript 的情况下单击关闭并打开子菜单：

html, body {
    font-family: Arial, Helvetica, sans-serif;
}
.navigation {
  width: 300px;
}
.mainmenu, .submenu {
  list-style: none;
  padding: 0;
  margin: 0;
}
.mainmenu a, .mainmenu label {
  display: block;
  background-color: #CCC;
  text-decoration: none;
  padding: 10px;
  color: #000;
}
.mainmenu a:hover, .mainmenu label:hover {
    background-color: #C5C5C5;
}
/* hide the input */
.mainmenu input {
  display: none;
}
/* if a sibling checkbox is check show the menu */
.mainmenu input:checked ~ .submenu {
  display: block;
  max-height: 200px;
}
.submenu a, .submenu label {
  background-color: #999;
}
.submenu a:hover {
  background-color: #666;
}
.submenu {
  overflow: hidden;
  max-height: 0;
  transition: all 0.5s ease-out;
}

<nav class="navigation">
  <ul class="mainmenu">
    <li><a href="">Home</a></li>
    <li><a href="">About</a></li>
    <li><input type="checkbox" id="products">
      <label for="products">Products</label>
      <ul class="submenu">
        <li><a href="">Tops</a></li>
        <li><a href="">Bottoms</a></li>
        <li><a href="">Footwear</a></li>
      </ul>
    </li>
    <li><a href="">Contact us</a></li>
  </ul>
</nav>

Answer 2

我希望这对你有所帮助。我添加了一些jquery。用于目标子菜单的 ID。您也可以为其他人重复它。只需要更改 id。我也为关于选项卡创建了一个示例。在这里，单击另一个选项卡时，另一个选项卡菜单将关闭。

$('.dropdown').click(function () {
  var target_id = $(this).attr('data-toggle');
  $('.dropdown-list').not(target_id).slideUp();
  $(target_id).slideToggle();
  $('.dropdown-list').not(target_id).parents('li, .icon-tab').removeClass('active');
  $('.dropdown').not(this).parents(' .icon-tab').removeClass('active');
  $(this).parents('li, .icon-tab').toggleClass('active');
});

html, body {
    font-family: Arial, Helvetica, sans-serif;
}
/* define a fixed width for the entire menu */
.navigation {
  width: 300px;
}
/* reset our lists to remove bullet points and padding */
.mainmenu, .submenu {
  list-style: none;
  padding: 0;
  margin: 0;
}
/* make ALL links (main and submenu) have padding and background color */
.mainmenu a {
  display: block;
  background-color: #CCC;
  text-decoration: none;
  padding: 10px;
  color: #000;
}
/* add hover behaviour */
.mainmenu a:hover {
    background-color: #C5C5C5;
}
/* when hovering over a .mainmenu item,
  display the submenu inside it.
  we're changing the submenu's max-height from 0 to 200px;
*/
/*
  we now overwrite the background-color for .submenu links only.
  CSS reads down the page, so code at the bottom will overwrite the code at the top.
*/
.submenu a {
  background-color: #999;
}
/* hover behaviour for links inside .submenu */
.submenu a:hover {
  background-color: #666;
}
/* this is the initial state of all submenus.
  we set it to max-height: 0, and hide the overflowed content.
*/
.submenu {
 
 display:none;}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav class="navigation">
  <ul class="mainmenu">
    <li><a href="">Home</a></li>
    <li><a class="dropdown" data-toggle="#about">About</a>
      <ul class="submenu dropdown-list" id="about">
        <li><a href="">Tops</a></li>
        <li><a href="">Bottoms</a></li>
        <li><a href="">Footwear</a></li>
      </ul>
    
    </li>
    <li><a class="dropdown" data-toggle="#products">Products</a>
      <ul class="submenu dropdown-list" id="products">
        <li><a href="">Tops</a></li>
        <li><a href="">Bottoms</a></li>
        <li><a href="">Footwear</a></li>
      </ul>
    </li>
    <li><a href="">Contact us</a></li>
  </ul>
</nav>

Answer 3

使用 js 试试这个

$(document).ready(function(){
        $('.dropdown').each(function() {
          var $dropdown = $(this);
          $(".dropdown-link", $dropdown).click(function(e) {
            e.preventDefault();
            $div = $(".submenu", $dropdown);
            $div.toggle();
            $(".submenu").not($div).hide();
            return false;
          });
        });
        $('html').click(function(){
          $(".submenu").hide();
        });
      });

html, body {
            font-family: Arial, Helvetica, sans-serif;
        }
        /* define a fixed width for the entire menu */
        .navigation {
          width: 300px;
        }
        /* reset our lists to remove bullet points and padding */
        .mainmenu, .submenu {
          list-style: none;
          padding: 0;
          margin: 0;
        }
        /* make ALL links (main and submenu) have padding and background color */
        .mainmenu a {
          display: block;
          background-color: #CCC;
          text-decoration: none;
          padding: 10px;
          color: #000;
        }
        /* add hover behaviour */
        .mainmenu a:hover {
            background-color: #C5C5C5;
        }
        /* when hovering over a .mainmenu item,
          display the submenu inside it.
          we're changing the submenu's max-height from 0 to 200px;
        */
        /*
          we now overwrite the background-color for .submenu links only.
          CSS reads down the page, so code at the bottom will overwrite the code at the top.
        */
        .submenu a {
          background-color: #999;
        }
        /* hover behaviour for links inside .submenu */
        .submenu a:hover {
          background-color: #666;
        }
        /* this is the initial state of all submenus.
          we set it to max-height: 0, and hide the overflowed content.
        */
        .submenu {
          overflow: hidden;
          display: none;
          -webkit-transition: all 0.5s ease-out;
        }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<nav class="navigation">
      <ul class="mainmenu">
        <li><a href="">Home</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-link">About</a>
          <ul class="submenu">
            <li><a href="">Tops</a></li>
            <li><a href="">Bottoms</a></li>
            <li><a href="">Footwear</a></li>
          </ul>
        </li>
        <li class="dropdown">
          <a href="#" class="dropdown-link">Products</a>
          <ul class="submenu">
            <li><a href="">Tops</a></li>
            <li><a href="">Bottoms</a></li>
            <li><a href="">Footwear</a></li>
          </ul>
        </li>
        <li class="dropdown">
          <a href="#" class="dropdown-link">Other dropdown</a>
          <ul class="submenu">
            <li><a href="">Tops</a></li>
            <li><a href="">Bottoms</a></li>
            <li><a href="">Footwear</a></li>
          </ul>
        </li>
        <li><a href="">Contact us</a></li>
      </ul>
    </nav>

Answer 4

这是

使用纯JS的

.CSS

.subrollin{
  overflow: hidden;
  max-height: 0;
  -webkit-transition: all 0.5s ease-in;
}
.subrollout{
  overflow: block;
  max-height: 200px;
  -webkit-transition: all 0.5s ease-out;
}

.JS

var element = document.getElementsByClassName('parentmenu')[0];
element.addEventListener("click", function(e) {
var sub = document.getElementsByClassName('submenu')[0];
  if(sub.classList.contains('subrollout')){
      sub.classList.add("subrollin");    
      sub.classList.remove("subrollout");
  } else {
      sub.classList.add("subrollout");
      sub.classList.remove("subrollin");
  }
}, false);

请参阅此代码笔：https://codepen.io/anon/pen/gzpaer