javascript - CSS active伪类改变状态吞噬onclick事件

Question

我正在改编一个找到的例子 here更像一个“真正的”菜单，因为它应该在用户点击时折叠。

我更喜欢这样一个事实，即菜单的所有视觉方面都在 css 中处理，而 javascript 仅用于处理用户选择选项时所需的操作。我觉得这是最适合我的特定应用的方法。

但是，当菜单被收起时，我发现我分配给每个链接的 onclick 事件被删除(或忽略)。

我发布了 2 个版本，一个在用户选择一个选项时会触发所需的 onclick 事件，另一个可以很好地收起菜单，但也吞没了 onclick 事件。我正在寻求一种将 2 个结果组合到一个工作菜单中的解决方案，它也满足了点击后自行消失的要求。

EDIT 刚刚注意到我注释掉了一些额外的代码(在弄清楚纯 css 解决方案之前的早期尝试。我正在调用 mouseleave，但没有效果。

两个版本之间的唯一区别是添加了 CSS 子句:

#menuwrapper ul:active{
    display:none;
}

“有效”但不会折叠菜单的版本

   var display = document.getElementById("display");
   $(document).ready(function() {
     $('li.menu_clickable').click(function() {
       if (this.children.length === 1) {
         //$(this).trigger('mouseleave');
         display.innerHTML = 'you clicked ' + this.innerHTML;
       }
     });
   });

/* Define the body style */

body {
  font-family: Arial;
  font-size: 12px;
}
#maindiv {
  position: absolute;
  left: 200px;
  top: 0px;
}
/* We remove the margin, padding, and list style of UL and LI components */

#menuwrapper ul,
#menuwrapper ul li {
  margin: 0;
  padding: 0;
  list-style: none;
}
/* We apply background color and border bottom white and width to 150px */

#menuwrapper ul li {
  background-color: #7f95db;
  border-bottom: solid 1px white;
  width: 150px;
  cursor: pointer;
}
/* We apply the background hover color when user hover the mouse over of the li component */

#menuwrapper ul li:hover {
  background-color: #6679e9;
  position: relative;
  z-index: 100;
}
/* We apply the link style */

#menuwrapper ul li a {
  padding: 5px 15px;
  color: #ffffff;
  display: inline-block;
  text-decoration: none;
}
/**** SECOND LEVEL MENU ****/

/* We make the position to absolute for flyout menu and hidden the ul until the user hover the parent li item */

#menuwrapper ul li ul {
  position: absolute;
  display: none;
}
/* When user has hovered the li item, we show the ul list by applying display:block, note: 150px is the individual menu width.  */

#menuwrapper ul li:hover ul {
  left: 150px;
  top: 0px;
  display: block;
}
/* we apply different background color to 2nd level menu items*/

#menuwrapper ul li ul li {
  background-color: #cae25a;
}
/* We change the background color for the level 2 submenu when hovering the menu */

#menuwrapper ul li:hover ul li:hover {
  background-color: #b1b536;
}
/* We style the color of level 2 links */

#menuwrapper ul li ul li a {
  color: #454444;
  display: inline-block;
  width: 120px;
}
/**** THIRD LEVEL MENU ****/

/* We need to hide the 3rd menu, when hovering the first level menu */

#menuwrapper ul li:hover ul li ul {
  position: absolute;
  display: none;
}
/* We show the third level menu only when they hover the second level menu parent */

#menuwrapper ul li:hover ul li:hover ul {
  display: block;
  left: 150px;
  top: 0;
}
/* We change the background color for the level 3 submenu*/

#menuwrapper ul li:hover ul li:hover ul li {
  background: #86d3fa;
}
/* We change the background color for the level 3 submenu when hovering the menu */

#menuwrapper ul li:hover ul li:hover ul li:hover {
  background: #358ebc;
}
/* We change the level 3 link color */

#menuwrapper ul li:hover ul li:hover ul li a {
  color: #ffffff;
}
/* Hide the menu when a link is clicked on */

/*
#menuwrapper ul:active{
    display:none;
}
*/

/* Clear float */

.clear {
  clear: both;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="menuwrapper">
  <ul>
    <li class="menu_clickable"><a href="#">Home</a>
    </li>
    <li class="menu_clickable"><a href="#">Products</a>
      <ul>
        <li class="menu_clickable"><a href="#">Product 1</a>
          <ul>
            <li class="menu_clickable"><a href="#">Sub Product 1</a>
            </li>
            <li class="menu_clickable"><a href="#">Sub Product 2</a>
            </li>
            <li class="menu_clickable"><a href="#">Sub Product 3</a>
            </li>
          </ul>
        </li>
        <li class="menu_clickable"><a href="#">Product 2</a>
        </li>
        <li class="menu_clickable"><a href="#">Product 3</a>
        </li>
      </ul>
    </li>
    <li><a href="#">About Us</a>
      <ul>
        <li class="menu_clickable"><a href="#">Faqs</a>
        </li>
        <li class="menu_clickable"><a href="#">Contact Us</a>
        </li>
        <li class="menu_clickable"><a href="#">Where are we?</a>
        </li>
      </ul>
    </li>
    <li class="menu_clickable"><a href="#">Help</a>
  </ul>
</div>

<div id="maindiv">
  <div>
    <label id="display">click an option</label>
  </div>
  <div>
    <button onclick="alert('hey!');">
      some button
    </button>under the menu
  </div>
  <div>
    <input value="some input box">under the menu
  </div>
</div>

折叠菜单但不触发 onclick 的版本

   var display = document.getElementById("display");
   $(document).ready(function() {
     $('li.menu_clickable').click(function() {
       if (this.children.length === 1) {
         //$(this).trigger('mouseleave');
         display.innerHTML = 'you clicked ' + this.innerHTML;
       }
     });
   });

/* Define the body style */

body {
  font-family: Arial;
  font-size: 12px;
}
#maindiv {
  position: absolute;
  left: 200px;
  top: 0px;
}
/* We remove the margin, padding, and list style of UL and LI components */

#menuwrapper ul,
#menuwrapper ul li {
  margin: 0;
  padding: 0;
  list-style: none;
}
/* We apply background color and border bottom white and width to 150px */

#menuwrapper ul li {
  background-color: #7f95db;
  border-bottom: solid 1px white;
  width: 150px;
  cursor: pointer;
}
/* We apply the background hover color when user hover the mouse over of the li component */

#menuwrapper ul li:hover {
  background-color: #6679e9;
  position: relative;
  z-index: 100;
}
/* We apply the link style */

#menuwrapper ul li a {
  padding: 5px 15px;
  color: #ffffff;
  display: inline-block;
  text-decoration: none;
}
/**** SECOND LEVEL MENU ****/

/* We make the position to absolute for flyout menu and hidden the ul until the user hover the parent li item */

#menuwrapper ul li ul {
  position: absolute;
  display: none;
}
/* When user has hovered the li item, we show the ul list by applying display:block, note: 150px is the individual menu width.  */

#menuwrapper ul li:hover ul {
  left: 150px;
  top: 0px;
  display: block;
}
/* we apply different background color to 2nd level menu items*/

#menuwrapper ul li ul li {
  background-color: #cae25a;
}
/* We change the background color for the level 2 submenu when hovering the menu */

#menuwrapper ul li:hover ul li:hover {
  background-color: #b1b536;
}
/* We style the color of level 2 links */

#menuwrapper ul li ul li a {
  color: #454444;
  display: inline-block;
  width: 120px;
}
/**** THIRD LEVEL MENU ****/

/* We need to hide the 3rd menu, when hovering the first level menu */

#menuwrapper ul li:hover ul li ul {
  position: absolute;
  display: none;
}
/* We show the third level menu only when they hover the second level menu parent */

#menuwrapper ul li:hover ul li:hover ul {
  display: block;
  left: 150px;
  top: 0;
}
/* We change the background color for the level 3 submenu*/

#menuwrapper ul li:hover ul li:hover ul li {
  background: #86d3fa;
}
/* We change the background color for the level 3 submenu when hovering the menu */

#menuwrapper ul li:hover ul li:hover ul li:hover {
  background: #358ebc;
}
/* We change the level 3 link color */

#menuwrapper ul li:hover ul li:hover ul li a {
  color: #ffffff;
}
/* Hide the menu when a link is clicked on */


#menuwrapper ul:active{
    display:none;
}


/* Clear float */

.clear {
  clear: both;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="menuwrapper">
  <ul>
    <li class="menu_clickable"><a href="#">Home</a>
    </li>
    <li class="menu_clickable"><a href="#">Products</a>
      <ul>
        <li class="menu_clickable"><a href="#">Product 1</a>
          <ul>
            <li class="menu_clickable"><a href="#">Sub Product 1</a>
            </li>
            <li class="menu_clickable"><a href="#">Sub Product 2</a>
            </li>
            <li class="menu_clickable"><a href="#">Sub Product 3</a>
            </li>
          </ul>
        </li>
        <li class="menu_clickable"><a href="#">Product 2</a>
        </li>
        <li class="menu_clickable"><a href="#">Product 3</a>
        </li>
      </ul>
    </li>
    <li><a href="#">About Us</a>
      <ul>
        <li class="menu_clickable"><a href="#">Faqs</a>
        </li>
        <li class="menu_clickable"><a href="#">Contact Us</a>
        </li>
        <li class="menu_clickable"><a href="#">Where are we?</a>
        </li>
      </ul>
    </li>
    <li class="menu_clickable"><a href="#">Help</a>
  </ul>
</div>

<div id="maindiv">
  <div>
    <label id="display">click an option</label>
  </div>
  <div>
    <button onclick="alert('hey!');">
      some button
    </button>under the menu
  </div>
  <div>
    <input value="some input box">under the menu
  </div>
</div>

Answer 1

你可以尝试使用 mousedown 而不是 click

   var display = document.getElementById("display");
   $(document).ready(function() {
     $('li.menu_clickable').mousedown(function() {
       if (this.children.length === 1) {
         //$(this).trigger('mouseleave');
         display.innerHTML = 'you clicked ' + this.innerHTML;
       }
     });
   });

/* Define the body style */

body {
  font-family: Arial;
  font-size: 12px;
}
#maindiv {
  position: absolute;
  left: 200px;
  top: 0px;
}
/* We remove the margin, padding, and list style of UL and LI components */

#menuwrapper ul,
#menuwrapper ul li {
  margin: 0;
  padding: 0;
  list-style: none;
}
/* We apply background color and border bottom white and width to 150px */

#menuwrapper ul li {
  background-color: #7f95db;
  border-bottom: solid 1px white;
  width: 150px;
  cursor: pointer;
}
/* We apply the background hover color when user hover the mouse over of the li component */

#menuwrapper ul li:hover {
  background-color: #6679e9;
  position: relative;
  z-index: 100;
}
/* We apply the link style */

#menuwrapper ul li a {
  padding: 5px 15px;
  color: #ffffff;
  display: inline-block;
  text-decoration: none;
}
/**** SECOND LEVEL MENU ****/

/* We make the position to absolute for flyout menu and hidden the ul until the user hover the parent li item */

#menuwrapper ul li ul {
  position: absolute;
  display: none;
}
/* When user has hovered the li item, we show the ul list by applying display:block, note: 150px is the individual menu width.  */

#menuwrapper ul li:hover ul {
  left: 150px;
  top: 0px;
  display: block;
}
/* we apply different background color to 2nd level menu items*/

#menuwrapper ul li ul li {
  background-color: #cae25a;
}
/* We change the background color for the level 2 submenu when hovering the menu */

#menuwrapper ul li:hover ul li:hover {
  background-color: #b1b536;
}
/* We style the color of level 2 links */

#menuwrapper ul li ul li a {
  color: #454444;
  display: inline-block;
  width: 120px;
}
/**** THIRD LEVEL MENU ****/

/* We need to hide the 3rd menu, when hovering the first level menu */

#menuwrapper ul li:hover ul li ul {
  position: absolute;
  display: none;
}
/* We show the third level menu only when they hover the second level menu parent */

#menuwrapper ul li:hover ul li:hover ul {
  display: block;
  left: 150px;
  top: 0;
}
/* We change the background color for the level 3 submenu*/

#menuwrapper ul li:hover ul li:hover ul li {
  background: #86d3fa;
}
/* We change the background color for the level 3 submenu when hovering the menu */

#menuwrapper ul li:hover ul li:hover ul li:hover {
  background: #358ebc;
}
/* We change the level 3 link color */

#menuwrapper ul li:hover ul li:hover ul li a {
  color: #ffffff;
}
/* Hide the menu when a link is clicked on */


#menuwrapper ul:active{
    display:none;

}


/* Clear float */

.clear {
  clear: both;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="menuwrapper">
  <ul>
    <li class="menu_clickable"><a href="#">Home</a>
    </li>
    <li class="menu_clickable"><a href="#">Products</a>
      <ul>
        <li class="menu_clickable"><a href="#">Product 1</a>
          <ul>
            <li class="menu_clickable"><a href="#">Sub Product 1</a>
            </li>
            <li class="menu_clickable"><a href="#">Sub Product 2</a>
            </li>
            <li class="menu_clickable"><a href="#">Sub Product 3</a>
            </li>
          </ul>
        </li>
        <li class="menu_clickable"><a href="#">Product 2</a>
        </li>
        <li class="menu_clickable"><a href="#">Product 3</a>
        </li>
      </ul>
    </li>
    <li><a href="#">About Us</a>
      <ul>
        <li class="menu_clickable"><a href="#">Faqs</a>
        </li>
        <li class="menu_clickable"><a href="#">Contact Us</a>
        </li>
        <li class="menu_clickable"><a href="#">Where are we?</a>
        </li>
      </ul>
    </li>
    <li class="menu_clickable"><a href="#">Help</a>
  </ul>
</div>

<div id="maindiv">
  <div>
    <label id="display">click an option</label>
  </div>
  <div>
    <button onclick="alert('hey!');">
      some button
    </button>under the menu
  </div>
  <div>
    <input value="some input box">under the menu
  </div>
</div>