点击后如何保留元素状态？菜单标签线条动画点击后复位问题

问题出在:active仅在鼠标按下瞬间生效，:focus默认仅通过键盘触发且点击其他区域会失焦，无法实现点击后持久化状态。我们可以通过JavaScript添加/移除类来实现需求：

修改步骤 #

1. 更新CSS样式 #

在原有hover相关的选择器中添加.active类，让激活状态和悬停状态保持一致：

body {
  background-color: #000;
}

figure.title-line {
  position: relative;
  margin: 10px;
  min-width: 230px;
  max-width: 315px;
  width: 100%;
  color: #ffffff;
  text-align: center;
  font-size: 16px;
  cursor: pointer; /* 添加鼠标指针样式，提示可点击 */
}

figure.title-line *:before,
figure.title-line *:after {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-transition: all 0.55s ease;
  transition: all 0.55s ease;
}

figure.title-line .title {
  position: absolute;
  top: -8px;
}

figure.title-line .title:before,
figure.title-line .title:after {
  height: 2px;
  position: absolute;
  content: '';
  background-color: #ffffff;
}

.title:before,
.title:after {
  opacity: 0;
}

/* 新增active类的opacity控制 */
.title:hover::before,
.title:hover::after,
.title.active::before,
.title.active::after {
  opacity: 1;
}

figure.title-line .title:before {
  top: 0;
  right: 0px;
  width: 186px;
  -webkit-transform: translateX(-50%);
  transform: translateX(-50%);
  -moz-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  -o-transform: translateX(-50%);
}

figure.title-line .title:after {
  bottom: 0;
  left: 0px;
  width: 260px;
  -webkit-transform: translateX(50%);
  transform: translateX(50%);
  -moz-transform: translateX(50%);
  -ms-transform: translateX(50%);
  -o-transform: translateX(50%);
}

figure.title-line a {
  margin: 0;
}

/* 新增active类的transform控制 */
figure.title-line:hover .title:before,
figure.title-line.hover .title:before,
figure.title-line.active .title:before,
figure.title-line:hover .title:after,
figure.title-line.hover .title:after,
figure.title-line.active .title:after,
figure.title-line:hover .title div:before,
figure.title-line.hover .title div:before,
figure.title-line.active .title div:before,
figure.title-line:hover .title div:after,
figure.title-line.hover .title div:after,
figure.title-line.active .title div:after {
  -webkit-transform: translate(0, 0);
  transform: translate(0, 0);
}

/* 新增active类的过渡延迟 */
figure.title-line:hover .title:before,
figure.title-line.hover .title:before,
figure.title-line.active .title:before,
figure.title-line:hover .title:after,
figure.title-line.hover .title:after,
figure.title-line.active .title:after {
  -webkit-transition-delay: 0.15s;
  transition-delay: 0.15s;
}

2. 调整HTML结构 #

给<a>标签添加href="#"（确保可点击提示）：

<figure class="title-line">
  <div class="title">
    <div>
      <a class="header" href="#">EXAMPLE</a>
    </div>
  </div>
</figure>
<figure class="title-line">
  <div class="title">
    <div>
      <a class="bottom" href="#">EXAMPLE2</a>
    </div>
  </div>
</figure>

3. 添加JavaScript控制类切换 #

点击标签时，移除所有标签的active类，给当前点击的标签所在容器添加active类：

// 获取所有标题容器
const titleLines = document.querySelectorAll('.title-line');

titleLines.forEach(line => {
  line.addEventListener('click', () => {
    // 移除所有容器的active类
    titleLines.forEach(item => {
      item.classList.remove('active');
      item.querySelector('.title').classList.remove('active');
    });
    // 给当前容器及内部title添加active类
    line.classList.add('active');
    line.querySelector('.title').classList.add('active');
  });
});

原理说明 #

通过JavaScript在点击时给目标元素添加active类，让CSS样式保持悬停时的状态，同时切换标签时移除其他标签的激活类，确保只有当前选中的标签保持线条状态。

内容的提问来源于stack exchange，提问作者TheCodingTentacle