使用 JQuery 单击子元素时更改父元素的 CSS

Question

我正在尝试在单击打开移动汉堡菜单时更改父图像（导航栏的边框）的 CSS，然后在再次单击/菜单关闭时再次返回。

我尝试使用 .parent 和 .find 选择器选项来定位带有边框的导航栏，但我无法让其中任何一个工作。我想我很接近，但我正在努力找出问题所在。感谢您的帮助。

$(".navbar-toggler").click(function(){
        $(this).find('.navbar').addClass("is-clicked");
        $(this).find('.navbar').removeClass("is-clicked");
            });

.navbar {
    position: relative;
    z-index: 98;
    border-bottom: 4px solid #000000;
    margin-left: 40px;
    margin-right: 40px;
    color: #000000;
    height: 100px;
}

.navbar.is-clicked {
    border-bottom: red;
}

.navbar-toggler {
    font-size: 32px;
    color: black;
}

<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet"/>
<link href="https://use.fontawesome.com/releases/v5.15.4/css/all.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<nav class="navbar navbar-expand-lg">
    <div class="container-fluid nav-container">
      <a class="navbar-brand" href="index.html">ABC.</a>
      <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="toggler-icon"><i class="fas fa-bars"></i>
        </span>
      </button>
      <div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
        <ul class="navbar-nav">
          <li class="nav-item nav-item-about p-nav">
            <a class="nav-link" aria-current="page" href="about.html">About</a>
          </li>
          <li class="nav-item p-nav">
            <a class="nav-contact" href="mailto:michellelclement@gmail.com?subject=Hello from your portfolio!">Contact</a>
          </li>
        </ul>
      </div>
    </div>
  </nav>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.min.js" integrity="sha384-QJHtvGhmr9XOIpI6YVutG+2QOK9T+ZnN4kzFN1RtK3zEFEIsxhlmWl5/YESvpZ13" crossorigin="anonymous"></script>
<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>

Answer 1

那是因为当你使用$(this).find('.navbar') 时，它只搜索具有类导航栏的元素inside。

如果要向外搜索，则需要使用.closest()，它将选择与选择器.navbar匹配的最近的父元素：

$(".navbar-toggler").click(function(){
    $(this).closest('.navbar').toggleClass("is-clicked");
});

查看概念验证示例：

$(".navbar-toggler").click(function() {
  $(this).closest('.navbar').toggleClass("is-clicked");
});

.navbar {
  position: relative;
  z-index: 98;
  border-bottom: 4px solid #000000;
  margin-left: 40px;
  margin-right: 40px;
  color: #000000;
  height: 100px;
}

.navbar.is-clicked {
  border-bottom-color: red;
}

.navbar-toggler {
  font-size: 32px;
  color: black;
}

<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" />
<link href="https://use.fontawesome.com/releases/v5.15.4/css/all.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<nav class="navbar navbar-expand-lg">
  <div class="container-fluid nav-container">
    <a class="navbar-brand" href="index.html">ABC.</a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="toggler-icon"><i class="fas fa-bars"></i>
        </span>
      </button>
    <div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
      <ul class="navbar-nav">
        <li class="nav-item nav-item-about p-nav">
          <a class="nav-link" aria-current="page" href="about.html">About</a>
        </li>
        <li class="nav-item p-nav">
          <a class="nav-contact" href="mailto:michellelclement@gmail.com?subject=Hello from your portfolio!">Contact</a>
        </li>
      </ul>
    </div>
  </div>
</nav>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.min.js" integrity="sha384-QJHtvGhmr9XOIpI6YVutG+2QOK9T+ZnN4kzFN1RtK3zEFEIsxhlmWl5/YESvpZ13" crossorigin="anonymous"></script>
<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>

Answer 2

Jquery：

$('.navbar-toggler').on('click', function(){
  $('.navbar').toggleClass('is-clicked');
});

您还需要在您的 css 中进行更改：

.navbar.is-clicked {
  border-bottom-color: red;
}