Question

a元素中有一个li。我想在用户单击current时将li类添加到相关的a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，但是当我再次单击该链接时，它将混乱。请帮我。谢谢。

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

由于某些原因，如果我需要检测.nav-link是否具有类.active的函数，那么只需将current类添加到父级？有什么办法可以做到这一点？

Answer 1

查看更新的功能

   $(".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，然后再将其添加到所需元素上。

$(".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>

更新后的答案（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，然后添加到活动链接中，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>

父类的addClass不起作用

2 个答案: