javascript - addClass to parent 不工作

Question

li 元素中有一个a。我想在用户点击 a 时将 current 类添加到相关的 li 中。但是，我不确定该怎么做。

$(".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>

我尝试使用切换，但当我再次单击链接时它会搞砸。请帮我。谢谢。

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

出于某些原因，如果我需要检测 .nav-link 是否具有类 .active 的功能，那么只需添加 current 给家长上课？我有什么方法可以实现这一点？

Answer 1

查看更新后的函数

   $(".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>