jquery - 使用 css 或 jquery 方法将 fa-caret right 交换为 Caret down

Question

我目前正在使用列表来处理左侧菜单。一切正常，但现在我想对 font-awsome 执行操作，我正在尝试将 fa-caret-right 移动到 fa-caret-down。 fa-caret-right 当列表未打开时 fa-caret-down 当列表打开时。我的问题是如何通过 css 或 jquery 来处理这种方法。我搜索了解决方案，但没有得到解决。这是我的 js fiddle 工作链接代码

https://fiddle.jshell.net/gLjbyjtm/4/

Update:1 caret Error Resolved Js fiddle 新版本

在这个版本中，我可以通过单击具有 fa-angle-right 的复选框标签成功地将左侧菜单切换到左侧。问题来自 fa-angle-right，它不会在切换时与左侧菜单一起移动到左侧，或者当它的宽度在切换时挤压时，跨度中的元素也应该向左移动。下面是我在 js fiddle 上的工作。有什么建议吗？

https://fiddle.jshell.net/uLy1xgtn/6/

Answer 1

调整伪元素

/* Additional */

.nav-side-menu ul li:not(.collapsed) .arrow:before {
    content: "\f0d7";
}

解释:

由于类 .collapsed 是在 Accordion 元素未打开时添加的，我们可以将其用作目标选择器。
并且由于在打开 时没有针对 Accordion 元素的类，我们将通过使用:not() - 否定 pseudo-class 来做到这一点。 选择器；在这种情况下，它将选择不具有 .collapsed 类的列表项元素 - 暗示它们是打开的。

The :not() CSS pseudo-class represents elements that do not match a list of selectors. Since it prevents specific items from being selected, it is known as the negation pseudo-class.

示例

/* Selects any element that is NOT a paragraph */
:not(p) {
  color: blue;
}

来源: :not() - CSS | MDN

Updated JSFiddle

.nav-side-menu {
  overflow: auto;
  font-family: verdana;
  font-size: 12px;
  font-weight: 200;
  background-color: #2e353d;
  position: fixed;
  top: 0px;
  width: 300px;
  height: 100%;
  color: #e1ffff;
}
.nav-side-menu .brand {
  background-color: #23282e;
  line-height: 50px;
  display: block;
  text-align: center;
  font-size: 14px;
}
.nav-side-menu .toggle-btn {
  display: none;
}
.nav-side-menu ul,
.nav-side-menu li {
  list-style: none;
  padding: 0px;
  margin: 0px;
  line-height: 35px;
  cursor: pointer;
  /*    
    .collapsed{
       .arrow:before{
                 font-family: FontAwesome;
                 content: "\f053";
                 display: inline-block;
                 padding-left:10px;
                 padding-right: 10px;
                 vertical-align: middle;
                 float:right;
            }
     }
*/
}
.nav-side-menu ul :not(collapsed) .arrow:before,
.nav-side-menu li :not(collapsed) .arrow:before {
  font-family: FontAwesome;
  content: "\f0da";
  display: inline-block;
  padding-left: 10px;
  padding-right: 10px;
  vertical-align: middle;
  float: right;
}
.nav-side-menu ul .active,
.nav-side-menu li .active {
  border-left: 3px solid #d19b3d;
  background-color: #4f5b69;
}
.nav-side-menu ul .sub-menu li.active,
.nav-side-menu li .sub-menu li.active {
  color: #d19b3d;
}
.nav-side-menu ul .sub-menu li.active a,
.nav-side-menu li .sub-menu li.active a {
  color: #d19b3d;
}
.nav-side-menu ul .sub-menu li,
.nav-side-menu li .sub-menu li {
  background-color: #181c20;
  border: none;
  line-height: 28px;
  border-bottom: 1px solid #23282e;
  margin-left: 0px;
}
.nav-side-menu ul .sub-menu li:hover,
.nav-side-menu li .sub-menu li:hover {
  background-color: #020203;
}
.nav-side-menu ul .sub-menu li:before,
.nav-side-menu li .sub-menu li:before {
  font-family: FontAwesome;
  content: "\f105";
  display: inline-block;
  padding-left: 10px;
  padding-right: 10px;
  vertical-align: middle;
}
.nav-side-menu li {
  padding-left: 0px;
  border-left: 3px solid #2e353d;
  border-bottom: 1px solid #23282e;
}
.nav-side-menu li a {
  text-decoration: none;
  color: #e1ffff;
}
.nav-side-menu li a i {
  padding-left: 10px;
  width: 20px;
  padding-right: 20px;
}
.nav-side-menu li:hover {
  border-left: 3px solid #d19b3d;
  background-color: #4f5b69;
  -webkit-transition: all 1s ease;
  -moz-transition: all 1s ease;
  -o-transition: all 1s ease;
  -ms-transition: all 1s ease;
  transition: all 1s ease;
}
@media (max-width: 767px) {
  .nav-side-menu {
    position: relative;
    width: 100%;
    margin-bottom: 10px;
  }
  .nav-side-menu .toggle-btn {
    display: block;
    cursor: pointer;
    position: absolute;
    right: 10px;
    top: 10px;
    z-index: 10 !important;
    padding: 3px;
    background-color: #ffffff;
    color: #000;
    width: 40px;
    text-align: center;
  }
  .brand {
    text-align: left !important;
    font-size: 22px;
    padding-left: 20px;
    line-height: 50px !important;
  }
}
@media (min-width: 767px) {
  .nav-side-menu .menu-list .menu-content {
    display: block;
  }
}
body {
  margin: 0px;
  padding: 0px;
}


/* Additional */

.nav-side-menu ul li:not(.collapsed) .arrow:before {
    content: "\f0d7";
}

<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet">
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<script src="/dist/scripts.min.js"></script>

<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet">




<div class="nav-side-menu">
    <div class="brand">Brand Logo</div>
   
  
        <div class="menu-list">
  
            <ul id="menu-content" class="menu-content">
                <li>
                  <a href="#">
                  <i class="fa fa-dashboard fa-lg"></i> Dashboard
                  </a>
                </li>

                <li  data-toggle="collapse" data-target="#products" class="collapsed active">
                  <a href="#"><i class="fa fa-gift fa-lg"></i> UI Elements <span class="arrow"></span></a>
                </li>
                <ul class="sub-menu collapse" id="products">
                    <li class="active"><a href="#">CSS3 Animation</a></li>
                    <li><a href="#">General</a></li>
                    <li><a href="#">Buttons</a></li>
                    <li><a href="#">Tabs & Accordions</a></li>
                    <li><a href="#">Typography</a></li>
                    <li><a href="#">FontAwesome</a></li>
                    <li><a href="#">Slider</a></li>
                    <li><a href="#">Panels</a></li>
                    <li><a href="#">Widgets</a></li>
                    <li><a href="#">Bootstrap Model</a></li>
                </ul>


                <li data-toggle="collapse" data-target="#service" class="collapsed">
                  <a href="#"><i class="fa fa-globe fa-lg"></i> Services <span class="arrow"></span></a>
                </li>  
                <ul class="sub-menu collapse" id="service">
                  <li>New Service 1</li>
                  <li>New Service 2</li>
                  <li>New Service 3</li>
                </ul>


                <li data-toggle="collapse" data-target="#new" class="collapsed">
                  <a href="#"><i class="fa fa-car fa-lg"></i> New <span class="arrow"></span></a>
                </li>
                <ul class="sub-menu collapse" id="new">
                  <li>New New 1</li>
                  <li>New New 2</li>
                  <li>New New 3</li>
                </ul>


                 <li>
                  <a href="#">
                  <i class="fa fa-user fa-lg"></i> Profile
                  </a>
                  </li>

                 <li>
                  <a href="#">
                  <i class="fa fa-users fa-lg"></i> Users
                  </a>
                </li>
            </ul>
     </div>
</div>

调整现有元素

/* Additional */

.nav-side-menu ul li:not(.collapsed) .arrow:before {
    transform: rotate(90deg);
}

.nav-side-menu ul li .arrow:before {
    transition: .5s;
}

Updated JSFiddle

.nav-side-menu {
  overflow: auto;
  font-family: verdana;
  font-size: 12px;
  font-weight: 200;
  background-color: #2e353d;
  position: fixed;
  top: 0px;
  width: 300px;
  height: 100%;
  color: #e1ffff;
}
.nav-side-menu .brand {
  background-color: #23282e;
  line-height: 50px;
  display: block;
  text-align: center;
  font-size: 14px;
}
.nav-side-menu .toggle-btn {
  display: none;
}
.nav-side-menu ul,
.nav-side-menu li {
  list-style: none;
  padding: 0px;
  margin: 0px;
  line-height: 35px;
  cursor: pointer;
  /*    
    .collapsed{
       .arrow:before{
                 font-family: FontAwesome;
                 content: "\f053";
                 display: inline-block;
                 padding-left:10px;
                 padding-right: 10px;
                 vertical-align: middle;
                 float:right;
            }
     }
*/
}
.nav-side-menu ul :not(collapsed) .arrow:before,
.nav-side-menu li :not(collapsed) .arrow:before {
  font-family: FontAwesome;
  content: "\f0da";
  display: inline-block;
  padding-left: 10px;
  padding-right: 10px;
  vertical-align: middle;
  float: right;
}
.nav-side-menu ul .active,
.nav-side-menu li .active {
  border-left: 3px solid #d19b3d;
  background-color: #4f5b69;
}
.nav-side-menu ul .sub-menu li.active,
.nav-side-menu li .sub-menu li.active {
  color: #d19b3d;
}
.nav-side-menu ul .sub-menu li.active a,
.nav-side-menu li .sub-menu li.active a {
  color: #d19b3d;
}
.nav-side-menu ul .sub-menu li,
.nav-side-menu li .sub-menu li {
  background-color: #181c20;
  border: none;
  line-height: 28px;
  border-bottom: 1px solid #23282e;
  margin-left: 0px;
}
.nav-side-menu ul .sub-menu li:hover,
.nav-side-menu li .sub-menu li:hover {
  background-color: #020203;
}
.nav-side-menu ul .sub-menu li:before,
.nav-side-menu li .sub-menu li:before {
  font-family: FontAwesome;
  content: "\f105";
  display: inline-block;
  padding-left: 10px;
  padding-right: 10px;
  vertical-align: middle;
}
.nav-side-menu li {
  padding-left: 0px;
  border-left: 3px solid #2e353d;
  border-bottom: 1px solid #23282e;
}
.nav-side-menu li a {
  text-decoration: none;
  color: #e1ffff;
}
.nav-side-menu li a i {
  padding-left: 10px;
  width: 20px;
  padding-right: 20px;
}
.nav-side-menu li:hover {
  border-left: 3px solid #d19b3d;
  background-color: #4f5b69;
  -webkit-transition: all 1s ease;
  -moz-transition: all 1s ease;
  -o-transition: all 1s ease;
  -ms-transition: all 1s ease;
  transition: all 1s ease;
}
@media (max-width: 767px) {
  .nav-side-menu {
    position: relative;
    width: 100%;
    margin-bottom: 10px;
  }
  .nav-side-menu .toggle-btn {
    display: block;
    cursor: pointer;
    position: absolute;
    right: 10px;
    top: 10px;
    z-index: 10 !important;
    padding: 3px;
    background-color: #ffffff;
    color: #000;
    width: 40px;
    text-align: center;
  }
  .brand {
    text-align: left !important;
    font-size: 22px;
    padding-left: 20px;
    line-height: 50px !important;
  }
}
@media (min-width: 767px) {
  .nav-side-menu .menu-list .menu-content {
    display: block;
  }
}
body {
  margin: 0px;
  padding: 0px;
}


/* Additional */

.nav-side-menu ul li:not(.collapsed) .arrow:before {
    transform: rotate(90deg);
}

.nav-side-menu ul li .arrow:before {
    transition: .5s;
}

<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet">
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<script src="/dist/scripts.min.js"></script>

<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet">




<div class="nav-side-menu">
    <div class="brand">Brand Logo</div>
   
  
        <div class="menu-list">
  
            <ul id="menu-content" class="menu-content">
                <li>
                  <a href="#">
                  <i class="fa fa-dashboard fa-lg"></i> Dashboard
                  </a>
                </li>

                <li  data-toggle="collapse" data-target="#products" class="collapsed active">
                  <a href="#"><i class="fa fa-gift fa-lg"></i> UI Elements <span class="arrow"></span></a>
                </li>
                <ul class="sub-menu collapse" id="products">
                    <li class="active"><a href="#">CSS3 Animation</a></li>
                    <li><a href="#">General</a></li>
                    <li><a href="#">Buttons</a></li>
                    <li><a href="#">Tabs & Accordions</a></li>
                    <li><a href="#">Typography</a></li>
                    <li><a href="#">FontAwesome</a></li>
                    <li><a href="#">Slider</a></li>
                    <li><a href="#">Panels</a></li>
                    <li><a href="#">Widgets</a></li>
                    <li><a href="#">Bootstrap Model</a></li>
                </ul>


                <li data-toggle="collapse" data-target="#service" class="collapsed">
                  <a href="#"><i class="fa fa-globe fa-lg"></i> Services <span class="arrow"></span></a>
                </li>  
                <ul class="sub-menu collapse" id="service">
                  <li>New Service 1</li>
                  <li>New Service 2</li>
                  <li>New Service 3</li>
                </ul>


                <li data-toggle="collapse" data-target="#new" class="collapsed">
                  <a href="#"><i class="fa fa-car fa-lg"></i> New <span class="arrow"></span></a>
                </li>
                <ul class="sub-menu collapse" id="new">
                  <li>New New 1</li>
                  <li>New New 2</li>
                  <li>New New 3</li>
                </ul>


                 <li>
                  <a href="#">
                  <i class="fa fa-user fa-lg"></i> Profile
                  </a>
                  </li>

                 <li>
                  <a href="#">
                  <i class="fa fa-users fa-lg"></i> Users
                  </a>
                </li>
            </ul>
     </div>
</div>