打开下拉菜单on单击侧边栏 [英] Open drop-down menu onClick in sidebar

问题描述

我正在一个项目上，我已经创建了一个导航栏.在此下拉菜单中也存在.在此下拉菜单中，有悬停效果.

I am working on a project and I have created one navbar. In this dropdown menu also present. In this dropdown, the hover effect is there.

现在，我正在尝试点击事件并打开和关闭下拉菜单的子菜单.但是没有用.我仅使用 HTML和CSS .

Now I am trying to click event and open and close dropdown's submenu. But not working. I am using only HTML and CSS.

现在悬停下拉菜单已打开.但我正在尝试:

Now on hover dropdown is open. But I am trying to do:

当我点击时

打开和关闭 下拉菜单.

我的代码是:

/* 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;
*/

.mainmenu li:hover .submenu {
  display: block;
  max-height: 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: #ddd;
}

/* hover behaviour for links inside .submenu */
.submenu a:hover {
  background-color: #993;
}

/* this is the initial state of all submenus.
  we set it to max-height: 0, and hide the overflowed content.
*/
.submenu {
  overflow: hidden;
  max-height: 0;
  -webkit-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><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>

推荐答案

您可以在

You can use a checkbox (<input type="checkbox">) with the adjacent sibling combinator (+) to toggle the sub menu. Convert the link (a) to a label. Set the label's for attribute to the input's id, and hide the input using display: none.

/* 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,
.mainmenu label {
  display: block;
  background-color: #CCC;
  text-decoration: none;
  padding: 10px;
  color: #000;
}

.mainmenu input {
  display: none;
}


/* 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;
*/

.mainmenu :checked+.submenu {
  display: block;
  max-height: 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: #ddd;
}


/* hover behaviour for links inside .submenu */

.submenu a:hover {
  background-color: #993;
}


/* this is the initial state of all submenus.
  we set it to max-height: 0, and hide the overflowed content.
*/

.submenu {
  overflow: hidden;
  max-height: 0;
  -webkit-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><label for="products">Products</label><input type="checkbox" id="products">
      <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>

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