实现Bootstrap Tooltip背景模糊效果的问题求助

问题根源 #

Bootstrap Tooltip默认会被挂载到<body>标签下，和你的文本容器是同级节点，这就导致backdrop-filter无法作用到Tooltip下方的文本内容上——因为它的“后方”是body，不是文本容器里的文字。

解决步骤 #

1. 修改Tooltip挂载容器 #

给按钮添加data-bs-container="#blur"属性，让Tooltip被挂载到文本所在的容器内部，这样Tooltip的层级就处于文本上方，backdrop-filter才能影响到下方的文字。

2. 调整Tooltip样式 #

• 移除.tooltip-inner的背景色，让它透明
• 给.tooltip添加伪元素，利用这个伪元素实现模糊背景，同时设置它的层级低于Tooltip内容、高于下方文本

3. 修正容器定位 #

给文本容器#blur设置position: relative，确保Tooltip的绝对定位能基于这个容器计算。

完整代码示例 #

HTML #

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous">

<!-- Wrapper container -->
<div class="container py-4">
  <div id="blur">
    The standard Lorem Ipsum passage, used since the 1500s "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum." Section 1.10.32 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC "Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt.
    <button class='btn btn-primary' data-bs-html='true' data-bs-toggle='tooltip' data-bs-container="#blur" data-bs-title='
      <div class="card">
        <div class="card-text">
          <div class="card-header">OK</div>
          <div class="card-body">OKOKOKOKOKOKOKOKO</div>
        </div>
      </div>'>
      Neque porro quisquam est
    </button> , qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?" 1914 translation by H. Rackham "But I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system, and expound the actual teachings of the great explorer of the truth, the master-builder of human happiness. No one rejects, dislikes, or avoids pleasure itself, because it is pleasure, but because those who do not know how to pursue pleasure rationally encounter consequences that are extremely painful. Nor again is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain, but because occasionally circumstances occur in which toil and pain can procure him some great pleasure. To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it? But who has any right to find fault with a man who chooses to enjoy a pleasure that has no annoying consequences, or one who avoids a pain that produces no resultant pleasure?" Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC "At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Temporibus autem quibusdam et aut officiis debitis aut rerum necessitatibus saepe eveniet ut et voluptates repudiandae sint et molestiae non recusandae. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat."
  </div>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL" crossorigin="anonymous"></script>

CSS #

#blur {
  position: relative;
}

.tooltip {
  position: absolute !important;
}

.tooltip-inner {
  padding: 50px;
  background: transparent;
  color: white;
  width: 100%;
  position: relative;
  z-index: 2;
}

.tooltip::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  border-radius: 0.375rem;
  z-index: 1;
}

.card {
  background: rgba(0, 0, 0, 0.5);
  padding: 20px;
  position: relative;
  z-index: 2;
}

JS #

$(document).ready(() => {
  const tooltipTriggerList = document.querySelectorAll('[data-bs-toggle="tooltip"]')
  const tooltipList = [...tooltipTriggerList].map(tooltipTriggerEl => new bootstrap.Tooltip(tooltipTriggerEl).show())
})

关键说明 #

• data-bs-container="#blur" 是核心：把Tooltip放到文本容器内，让它的视觉层级在文本上方
• 用.tooltip::before实现模糊背景，同时通过z-index确保Tooltip内容在模糊层上方
• 给#blur设置position: relative，保证Tooltip的定位基于这个容器，不会乱跑

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