css伪元素::placeholder-shown输入占位符动画

当输入框无内容时，::placeholder-shown 激活，结合 :focus 和 transition 可实现占位符上浮动画，如 translateY(-20px) 和缩小字体，模拟 Material Design 标签效果。

当用户在输入框中未输入内容时，::placeholder-shown 伪元素会处于激活状态。我们可以利用它来实现优雅的占位符动画效果，比如让占位符文字“上浮”或缩小，模拟 Material Design 风格的标签动画。

基本原理

::placeholder-shown 是一个 CSS 伪元素，用于匹配当前显示占位符文本的 或 元素。结合 :focus 和 CSS 过渡，可以创建平滑的占位符动画。</p> <h3>实现占位符上浮动画</h3> <p>目标：输入框获得焦点且用户未输入时，占位符向上移动并变小，形成标签效果。</p> <p>HTML 结构示例：</p> <p> <noscript><img decoding="async" src="https://cdn.chuangxiangniao.com/www/2025/12/175680040267945-397.jpg" alt="Fireflies.ai"></noscript><img decoding="async" class="j-lazy" src="https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png" data-original="https://cdn.chuangxiangniao.com/www/2025/12/175680040267945-397.jpg" alt="Fireflies.ai"> Fireflies.ai </p> <p>自动化会议记录和笔记工具，可以帮助你的团队记录、转录、搜索和分析语音对话。</p> <p> <noscript><img decoding="async" src="/static/images/card_xiazai.png" alt="Fireflies.ai"></noscript><img decoding="async" class="j-lazy" src="https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png" data-original="/static/images/card_xiazai.png" alt="Fireflies.ai"> 145 查看详情 <noscript><img decoding="async" src="/static/images/cardxiayige-3.png" alt="Fireflies.ai"></noscript><img decoding="async" class="j-lazy" src="https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png" data-original="/static/images/cardxiayige-3.png" alt="Fireflies.ai"> </p> <p>立即学习“前端免费学习笔记（深入）”；</p> <div class="input-group">  </div> <p>CSS 样式：</p> <p>.input-group {<br />  position: relative;<br />  margin: 20px 0;<br />}</p> <p>.input-group input {<br />  padding: 12px;<br />  font-size: 16px;<br />  border: 1px solid #ccc;<br />  border-radius: 4px;<br />  outline: none;<br />  transition: 0.3s ease;<br />}</p> <p>.input-group input::placeholder {<br />  opacity: 1;<br />  color: #999;<br />  transition: all 0.3s ease;<br />}</p> <p>.input-group input:placeholder-shown:not(:focus)::placeholder {<br />  transform: translateY(0);<br />}</p> <p>.input-group input:focus::placeholder,<br />.input-group input:not(:placeholder-shown)::placeholder {<br />  transform: translateY(-20px);<br />  font-size: 12px;<br />  color: #4a90e2;<br />}</p> <h3>关键点说明</h3> <p>使用 <strong>:not(:placeholder-shown)</strong> 判断用户已输入内容，此时占位符消失，但可通过样式控制其行为 结合 <strong>:focus</strong> 实现聚焦时动画 <strong>transform</strong> 比改变位置更高效，避免重排 添加 <strong>transition</strong> 让动画更自然 确保父容器 <strong>position: relative</strong>，方便后续<span class="wpcom_tag_link"><a href="https://www.chuangxiangniao.com/p/tag/jueduidingwei" title="绝对定位" target="_blank">绝对定位</a></span>标签（可选增强）</p> <p>基本上就这些。合理使用 ::placeholder-shown 能提升表单交互体验，不复杂但容易忽略细节。</p> <p>以上就是<span class="wpcom_tag_link"><a href="https://www.chuangxiangniao.com/p/tag/css" title="css" target="_blank">css</a></span>伪元素::placeholder-shown输入占位符动画的详细内容，更多请关注创想鸟其它相关文章！</p> <div class="entry-readmore"><div class="entry-readmore-btn"></div></div> <div class="entry-copyright"><p>版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。<br> 如发现本站有涉嫌抄袭侵权/违法违规的内容， 请发送邮件至 chuangxiangniao@163.com 举报，一经查实，本站将立刻删除。<br> 发布者：程序猿，转转请注明出处：<span>https://www.chuangxiangniao.com/p/997930.html</span></p></div> 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