html - 如何在访问/激活子元素时更改父元素的颜色

Question

我有一个下拉导航。我想要做的是当我点击任何子菜单链接时，我希望父按钮的颜色在链接处于事件状态时保持更改。 这是代码的 fiddle 链接。 https://jsfiddle.net/v28ydshL/

<nav>
                <div class="navbar-header">
                    <button style="background-color: #3382d5;" type="button" class="navbar-toggle" data-toggle="collapse" data-target="#menubar">
                        <span style="background-color: white;" class="icon-bar"></span>
                        <span style="background-color: white;" class="icon-bar"></span>
                        <span style="background-color: white;" class="icon-bar"></span>                        
                    </button>
                </div>
                <div id="menubar" class=" collapse navbar-collapse row">
                    <ul id="dropdownNavbar" class="nav navbar-nav">
                        <li class="dropdown">
                            <button type="button" class="btn dropbtn"><span class="glyphicon glyphicon-time"></span> Time Card
                                <span class="caret"></span></button>
                            <div class="dropdown-content">
                                <a id="showTimeCard" href="#">My Time Card</a>
                                <a href="#">Sub Menu 2</a>
                                <a href="#">Sub Menu 3</a>
                                <a href="#">Sub Menu 4</a>
                                <a href="#">Sub Menu 5</a>
                            </div>
                        </li>
                        <li class="dropdown">
                            <button type="button" class="btn dropbtn"><span class="glyphicon glyphicon-stats"></span> Project
                                <span class="caret"></span></button>
                            <div class="dropdown-content">
                                <a href="#">Sub Menu 1</a>
                                <a href="#">Sub Menu 2</a>
                                <a href="#">Sub Menu 3</a>
                            </div>
                        </li>
                        <li class="dropdown">
                            <button type="button" class="btn dropbtn"><span class="glyphicon glyphicon-user"></span> HR Links
                                <span class="caret"></span></button>
                            <div class="dropdown-content">
                                <a href="#">Sub Menu 1</a>
                                <a href="#">Sub Menu 2</a>
                            </div>
                        </li>
                        <li class="dropdown">
                            <button type="button" class="btn dropbtn">
                                <span class="glyphicon glyphicon-screenshot"></span> Leave Tracker
                                <span class="caret"></span></button>
                            <div class="dropdown-content">
                                <a href="#">Sub Menu 1</a>
                                <a href="#">Sub Menu 2</a>
                                <a href="#">Sub Menu 3</a>
                                <a href="#">Sub Menu 4</a>
                            </div>
                        </li>
                        <li class="dropdown">
                            <button type="button" class="btn dropbtn">
                                <span class="glyphicon glyphicon-briefcase"></span> Accounts
                                <span class="caret"></span></button>
                            <div class="dropdown-content">
                                <a href="#">Sub Menu 1</a>
                                <a href="#">Sub Menu 2</a>
                                <a href="#">Sub Menu 3</a>
                                <a href="#">Sub Menu 4</a>
                                <a href="#">Sub Menu 5</a>
                            </div>
                        </li>
                        <li class="dropdown">
                            <button type="button" class="btn dropbtn">
                                <span class="glyphicon glyphicon-headphones"></span> Service Desk
                                <span class="caret"></span></button>
                            <div class="dropdown-content">
                                <a href="#">Sub Menu 1</a>
                                <a href="#">Sub Menu 2</a>
                                <a href="#">Sub Menu 3</a>
                                <a href="#">Sub Menu 4</a>
                            </div>
                        </li>
                        <li class="dropdown">
                            <button type="button" class="btn dropbtn">
                                <span class="glyphicon glyphicon-file"></span> Reports
                                <span class="caret"></span></button>
                            <div class="dropdown-content">
                                <a href="#">Sub Menu 1</a>
                                <a href="#">Sub Menu 2</a>
                                <a href="#">Sub Menu 3</a>
                                <a href="#">Sub Menu 4</a>
                                <a href="#">Sub Menu 5</a>
                            </div>
                        </li>
                        <li class="dropdown">
                            <button type="button" class="btn dropbtn">
                                <span class="glyphicon glyphicon-cog"></span> Settings
                                <span class="caret"></span></button>
                            <div class="dropdown-content">
                                <a href="#">Sub Menu 1</a>
                                <a href="#">Sub Menu 2</a>
                                <a href="#">Sub Menu 3</a>
                            </div>
                        </li> 
                    </ul>
                </div>
            </nav>

这是我的CSS

ul {
    list-style-type: none;
    padding-left: 1px;

}
.dropdown {
    float: left;
    padding-right:1px;
}
.dropbtn{
    background-color: #060975;
    height:30px;
    border-radius: 0px 10px;
}
li button, .dropbtn {
    display: inline-block;
    background-color:#3382d5;
    color: white;
    text-align: center;
}
li button:hover, .dropdown:hover .dropbtn {
    background-color: #31b0d5;
}
button.dropdown {
    display: inline-block;
}
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #e8f3f4;
    min-width: 100%;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.1);
    z-index: 10;
}
.navbar-header{
    overflow: visible;
    z-index: 1;
}
.dropdown-content a {
    color: black;
    padding: 5px 10px;
    display: block;
    text-align: left;
}
.dropdown-content a:hover {
    background-color: #d8dee2
}
.dropdown-content a:visited .dropbtn{
    background-color: #e8f3f4;
}
.dropdown:hover .dropdown-content {
    display: block;
}
#menubar{
    padding-top: 5px;
    overflow: visible;
    z-index: 10;
    padding-left:0px;
    padding-right: 0px;
    margin: 0px;
}
#dropdownNavbar{
    margin: 0px;
}

Answer 1

由于您使用的是 Bootstrap - 您还必须使用 jquery - 这是一种 jquery 方法。为您想要的事件颜色创建一个类，然后在单击时从所有按钮中删除该类，然后将其应用于被单击的按钮。

$(document).ready(function() {
  $('.dropdown').click(function() {
    $('.dropbtn').removeClass('dropbtn-active');
    $(this).find('.dropbtn').addClass('dropbtn-active')
  });

})

ul {
  list-style-type: none;
  padding-left: 1px;
}
.dropdown {
  float: left;
  padding-right: 1px;
}
.dropbtn {
  background-color: #060975;
  height: 30px;
  border-radius: 0px 10px;
}
li button,
.dropbtn {
  display: inline-block;
  background-color: #3382d5;
  color: white;
  text-align: center;
}
.dropbtn-active {
  background-color: #31b0d5;
}
li button:hover,
.dropdown:hover .dropbtn {
  background-color: #31b0d5;
}
.dropdown:active .dropbtn {
  background-color: #31b0d5;
}
button.dropdown {
  display: inline-block;
}
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #e8f3f4;
  min-width: 100%;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.1);
  z-index: 10;
}
.navbar-header {
  overflow: visible;
  z-index: 1;
}
.dropdown-content a {
  color: black;
  padding: 5px 10px;
  display: block;
  text-align: left;
}
.dropdown-content a:hover {
  background-color: #d8dee2
}
.dropdown-content a:visited .dropbtn {
  background-color: #e8f3f4;
}
.dropdown:hover .dropdown-content {
  display: block;
}
#menubar {
  padding-top: 5px;
  overflow: visible;
  z-index: 10;
  padding-left: 0px;
  padding-right: 0px;
  margin: 0px;
}
#dropdownNavbar {
  margin: 0px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav>
  <div class="navbar-header">
    <button style="background-color: #3382d5;" type="button" class="navbar-toggle" data-toggle="collapse" data-target="#menubar">
      <span style="background-color: white;" class="icon-bar"></span>
      <span style="background-color: white;" class="icon-bar"></span>
      <span style="background-color: white;" class="icon-bar"></span> 
    </button>
  </div>
  <div id="menubar" class=" collapse navbar-collapse row">
    <ul id="dropdownNavbar" class="nav navbar-nav">
      <li class="dropdown">
        <button type="button" class="btn dropbtn"><span class="glyphicon glyphicon-time"></span> Time Card
          <span class="caret"></span>
        </button>
        <div class="dropdown-content">
          <a id="showTimeCard" href="#">My Time Card</a>
          <a href="#">Sub Menu 2</a>
          <a href="#">Sub Menu 3</a>
          <a href="#">Sub Menu 4</a>
          <a href="#">Sub Menu 5</a>
        </div>
      </li>
      <li class="dropdown">
        <button type="button" class="btn dropbtn"><span class="glyphicon glyphicon-stats"></span> Project
          <span class="caret"></span>
        </button>
        <div class="dropdown-content">
          <a href="#">Sub Menu 1</a>
          <a href="#">Sub Menu 2</a>
          <a href="#">Sub Menu 3</a>
        </div>
      </li>
      <li class="dropdown">
        <button type="button" class="btn dropbtn"><span class="glyphicon glyphicon-user"></span> HR Links
          <span class="caret"></span>
        </button>
        <div class="dropdown-content">
          <a href="#">Sub Menu 1</a>
          <a href="#">Sub Menu 2</a>
        </div>
      </li>
      <li class="dropdown">
        <button type="button" class="btn dropbtn">
          <span class="glyphicon glyphicon-screenshot"></span> Leave Tracker
          <span class="caret"></span>
        </button>
        <div class="dropdown-content">
          <a href="#">Sub Menu 1</a>
          <a href="#">Sub Menu 2</a>
          <a href="#">Sub Menu 3</a>
          <a href="#">Sub Menu 4</a>
        </div>
      </li>
      <li class="dropdown">
        <button type="button" class="btn dropbtn">
          <span class="glyphicon glyphicon-briefcase"></span> Accounts
          <span class="caret"></span>
        </button>
        <div class="dropdown-content">
          <a href="#">Sub Menu 1</a>
          <a href="#">Sub Menu 2</a>
          <a href="#">Sub Menu 3</a>
          <a href="#">Sub Menu 4</a>
          <a href="#">Sub Menu 5</a>
        </div>
      </li>
      <li class="dropdown">
        <button type="button" class="btn dropbtn">
          <span class="glyphicon glyphicon-headphones"></span> Service Desk
          <span class="caret"></span>
        </button>
        <div class="dropdown-content">
          <a href="#">Sub Menu 1</a>
          <a href="#">Sub Menu 2</a>
          <a href="#">Sub Menu 3</a>
          <a href="#">Sub Menu 4</a>
        </div>
      </li>
      <li class="dropdown">
        <button type="button" class="btn dropbtn">
          <span class="glyphicon glyphicon-file"></span> Reports
          <span class="caret"></span>
        </button>
        <div class="dropdown-content">
          <a href="#">Sub Menu 1</a>
          <a href="#">Sub Menu 2</a>
          <a href="#">Sub Menu 3</a>
          <a href="#">Sub Menu 4</a>
          <a href="#">Sub Menu 5</a>
        </div>
      </li>
      <li class="dropdown">
        <button type="button" class="btn dropbtn">
          <span class="glyphicon glyphicon-cog"></span> Settings
          <span class="caret"></span>
        </button>
        <div class="dropdown-content">
          <a href="#">Sub Menu 1</a>
          <a href="#">Sub Menu 2</a>
          <a href="#">Sub Menu 3</a>
        </div>
      </li>
    </ul>
  </div>
</nav>