addClass到父级不起作用

Question

在li元素内部有一个a。当用户单击a时，我想将current类添加到相关的li中。不过，我不知道怎样才能做到。

$(".nav-link").on('click', function(e) {
$(this).parent().toggleClass('current');
})

.nav-item.current {
width: 300px;
}

<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/1.14.3/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css" />
<ul class="nav nav-tabs" id="myTab" role="tablist">
<li class="nav-item current">
<a class="nav-link active" id="home-tab" data-toggle="tab" href="#home" role="tab" aria-controls="home" aria-selected="true">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" id="profile-tab" data-toggle="tab" href="#profile" role="tab" aria-controls="profile" aria-selected="false">Profile</a>
</li>
<li class="nav-item">
<a class="nav-link" id="contact-tab" data-toggle="tab" href="#contact" role="tab" aria-controls="contact" aria-selected="false">Contact</a>
</li>
</ul>
<div class="tab-content" id="myTabContent">
<div class="tab-pane fade show active" id="home" role="tabpanel" aria-labelledby="home-tab">Home</div>
<div class="tab-pane fade" id="profile" role="tabpanel" aria-labelledby="profile-tab">Profile</div>
<div class="tab-pane fade" id="contact" role="tabpanel" aria-labelledby="contact-tab">Contact</div>
</div>

我试着使用切换，但当我再次点击链接时，它会出错。请帮帮我。谢谢。

代码笔-https://codepen.io/rae0724/pen/pZNQMK

出于某些原因，如果我需要函数来检测.nav-link是否有类.active，那么只需将current类添加到父级？我有什么办法做到这一点？

Answer 1

查看更新后的功能

$(".nav-link").on('click', function(e) {
$(".current").removeClass('current');
$(this).parent().addClass('current');
})

我添加了$(".current").removeClass('current');行。您需要先从所有元素中删除当前类，然后在所需元素上再次添加它。

$(".nav-link").on('click', function(e) {
$(".current").removeClass('current');
$(this).parent().addClass('current');
})

.nav-item.current {
width: 300px;
}

<link rel="stylesheet prefetch" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/js/bootstrap.min.js"></script>
<ul class="nav nav-tabs" id="myTab" role="tablist">
<li class="nav-item current">
<a class="nav-link active" id="home-tab" data-toggle="tab" href="#home" role="tab" aria-controls="home" aria-selected="true">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" id="profile-tab" data-toggle="tab" href="#profile" role="tab" aria-controls="profile" aria-selected="false">Profile</a>
</li>
<li class="nav-item">
<a class="nav-link" id="contact-tab" data-toggle="tab" href="#contact" role="tab" aria-controls="contact" aria-selected="false">Contact</a>
</li>
</ul>
<div class="tab-content" id="myTabContent">
<div class="tab-pane fade show active" id="home" role="tabpanel" aria-labelledby="home-tab">Home</div>
<div class="tab-pane fade" id="profile" role="tabpanel" aria-labelledby="profile-tab">Profile</div>
<div class="tab-pane fade" id="contact" role="tabpanel" aria-labelledby="contact-tab">Contact</div>
</div>

更新的答案(基于评论(

$(".nav-link").on('click', function(e) {
$(".current").removeClass('current');
setTimeout(function() {
$(".active").parent().addClass('current');
}, 0);
})

$(".nav-link").on('click', function(e) {
$(".current").removeClass('current');
setTimeout(function() {
$(".active").parent().addClass('current');
}, 0);
})

.nav-item.current {
width: 300px;
}

<link rel="stylesheet prefetch" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/js/bootstrap.min.js"></script>
<ul class="nav nav-tabs" id="myTab" role="tablist">
<li class="nav-item current">
<a class="nav-link active" id="home-tab" data-toggle="tab" href="#home" role="tab" aria-controls="home" aria-selected="true">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" id="profile-tab" data-toggle="tab" href="#profile" role="tab" aria-controls="profile" aria-selected="false">Profile</a>
</li>
<li class="nav-item">
<a class="nav-link" id="contact-tab" data-toggle="tab" href="#contact" role="tab" aria-controls="contact" aria-selected="false">Contact</a>
</li>
</ul>
<div class="tab-content" id="myTabContent">
<div class="tab-pane fade show active" id="home" role="tabpanel" aria-labelledby="home-tab">Home</div>
<div class="tab-pane fade" id="profile" role="tabpanel" aria-labelledby="profile-tab">Profile</div>
<div class="tab-pane fade" id="contact" role="tabpanel" aria-labelledby="contact-tab">Contact</div>
</div>

Answer 2

从所有同级中删除该类并添加到活动链接中，使用$(this).parent().addClass('current').siblings().removeClass('current');来实现它，请检查下面的工作示例。

$(".nav-link").on('click', function(e) {
$(this).parent().addClass('current').siblings().removeClass('current');
})

.nav-item.current {
width: 300px;
border-bottom: 2px solid green
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="nav nav-tabs" id="myTab" role="tablist">
<li class="nav-item current">
<a class="nav-link active" id="home-tab" data-toggle="tab" href="#home" role="tab" aria-controls="home" aria-selected="true">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" id="profile-tab" data-toggle="tab" href="#profile" role="tab" aria-controls="profile" aria-selected="false">Profile</a>
</li>
<li class="nav-item">
<a class="nav-link" id="contact-tab" data-toggle="tab" href="#contact" role="tab" aria-controls="contact" aria-selected="false">Contact</a>
</li>
</ul>
<div class="tab-content" id="myTabContent">
<div class="tab-pane fade show active" id="home" role="tabpanel" aria-labelledby="home-tab">Home</div>
<div class="tab-pane fade" id="profile" role="tabpanel" aria-labelledby="profile-tab">Profile</div>
<div class="tab-pane fade" id="contact" role="tabpanel" aria-labelledby="contact-tab">Contact</div>
</div>