根据是否存在下拉菜单,在bootstrap4下拉列表中显示或隐藏插入符号图标 [英] Show or hide caret icon on bootstrap4 dropdown based on dropdown menu present or not
本文介绍了根据是否存在下拉菜单,在bootstrap4下拉列表中显示或隐藏插入符号图标的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想显示或隐藏基于菜单项的插入符号是否存在。如果菜单项目显示插入符号图标,则将其隐藏。我正在使用bootstrap4,在我的情况下,下拉菜单项将动态生成。
I want to show or hide caret icons based on menu items is present or not. if menu items present show caret icon else hide it. i am using bootstrap4 and in my case dropdown menu items will by dynamically generated.
.dropdown-toggle::after {
display:none;!important
}
上面的代码删除插入符号但是如何根据下拉列表中的菜单显示/隐藏它?
Above code removes caret symbol but how to show/hide it based on the menu in dropdown present or not ?
.dropdown-toggle::after {
display:none !important;
}
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<div class="dropdown">
<button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
Dropdown button
</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Link 1</a>
<a class="dropdown-item" href="#">Link 2</a>
<a class="dropdown-item" href="#">Link 3</a>
</div>
</div>
推荐答案
如果 $('。dropdown-menu .dropdown-item')中没有项目,请使用
.hide()
.length == 0
Use .hide()
if no items inside $('.dropdown-menu .dropdown-item').length==0
$( document ).ready(function() {
if($('.dropdown-menu .dropdown-item').length==0 )
{
$('.fas.fa-shopping-cart').hide();
}
});
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.1.0/css/all.css" integrity="sha384-lKuwvrZot6UHsBSfcMvOkWwlCMgc0TaWr+30HWe3a4ltaBwTZhyTEggF5tJv8tbt" crossorigin="anonymous">
<div class="dropdown">
<button type="button" class="btn dropdown-toggle" data-toggle="dropdown">list<i class="fas fa-shopping-cart"></i>
</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Link 1</a>
<a class="dropdown-item" href="#">Link 2</a>
<a class="dropdown-item" href="#">Link 3</a>
</div>
</div>
只有css使用 only-child:
Only css use only-child:
.dropdown button:only-child .fas.fa-shopping-cart{
display:none;
}
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.1.0/css/all.css" integrity="sha384-lKuwvrZot6UHsBSfcMvOkWwlCMgc0TaWr+30HWe3a4ltaBwTZhyTEggF5tJv8tbt" crossorigin="anonymous">
<div class="dropdown">
<button type="button" class="btn dropdown-toggle" data-toggle="dropdown">list<i class="fas fa-shopping-cart"></i>
</button>
</div>
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