实际上我有导航栏,我已经class="dropdown-toggle" data-toggle="dropdown"
从 w3schools.com添加到我的锚标签中,这样它但箭头仍然没有显示。导航栏上的悬停正在工作,但箭头没有显示。
html file
<div class="dropdown">
<a class="mega-menu-link dropbtn">Selection<span class="mega-indicator"></span></a>
<div class="dropdown-content">
<a routerLink="add-selection" routerLinkActive="active">Create Selection <span class="mega-indicator"></span></a>
<a routerLink="show-selection" routerLinkActive="">Show All Selection <span class="mega-indicator"></span></a>
</div>
</div>
css文件
.dropbtn {
background-color: #4CAF50;
color: #fff !important;
padding: 16px;
font-size: 16px;
border: none;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f1f1f1;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: #ddd;}
.dropdown:hover .dropdown-content {display: block;}
.dropdown:hover .dropbtn {background-color: #3e8e41;}
只需将类添加到标签“dropdown-toggle”即可显示下拉箭头
.dropbtn {
background-color: #4CAF50;
color: #fff !important;
padding: 16px;
font-size: 16px;
border: none;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f1f1f1;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: #ddd;}
.dropdown:hover .dropdown-content {display: block;}
.dropdown:hover .dropbtn {background-color: #3e8e41;}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<div class="dropdown">
<a class="mega-menu-link dropbtn dropdown-toggle">Selection<span class="caret"></span></span></a>
<div class="dropdown-content">
<a routerLink="add-selection" routerLinkActive="active">Create Selection <span class="mega-indicator"></span></a>
<a routerLink="show-selection" routerLinkActive="">Show All Selection <span class="mega-indicator"></span></a>
</div>
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我来说两句