拉伸链接

通过 CSS“拉伸”嵌套链接，使任何 HTML 元素或 Bootstrap 组件可点击。

将 .stretched-link 添加到链接以使包含它的块可点击。在大多数情况下，这意味着添加了 position: relative; CSS且包含具有 .stretched-link 类的链接的元素是可点击的。请参考 CSS position 如何工作、 .stretched-link 不能与大多数表格元素混合。

默认情况下，卡片组件在 Bootstrap 中已经设置了 position: relative，因此在这种情况下，您可以安全地将 .stretched-link 类添加到卡片中的链接，而无需进行任何其他 HTML 更改。

不建议有多个链接和点击目标的时候使用拉伸链接。但是，如果需要，一些 position 和 z-index 样式可以提供帮助。

Card with stretched link

Some quick example text to build on the card title and make up the bulk of the card's content.

Go somewhere

<div class="card" style="width: 18rem;">
  <img src="..." class="card-img-top" alt="...">
  <div class="card-body">
    <h5 class="card-title">Card with stretched link</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    <a href="#" class="btn btn-primary stretched-link">Go somewhere</a>
  </div>
</div>

大多数自定义组件默认没有position:relative，所以我们需要在此处添加.position-relative，防止链接拉伸到父元素之外。

Custom component with stretched link

This is some placeholder content for the custom component. It is intended to mimic what some real-world content would look like, and we're using it here to give the component a bit of body and size.

Go somewhere

<div class="d-flex position-relative">
  <img src="..." class="flex-shrink-0 me-3" alt="...">
  <div>
    <h5 class="mt-0">Custom component with stretched link</h5>
    <p>This is some placeholder content for the custom component. It is intended to mimic what some real-world content would look like, and we're using it here to give the component a bit of body and size.</p>
    <a href="#" class="stretched-link">Go somewhere</a>
  </div>
</div>

Columns with stretched link

Another instance of placeholder content for this other custom component. It is intended to mimic what some real-world content would look like, and we're using it here to give the component a bit of body and size.

Go somewhere

<div class="row g-0 bg-light position-relative">
  <div class="col-md-6 mb-md-0 p-md-4">
    <img src="..." class="w-100" alt="...">
  </div>
  <div class="col-md-6 p-4 ps-md-0">
    <h5 class="mt-0">Columns with stretched link</h5>
    <p>Another instance of placeholder content for this other custom component. It is intended to mimic what some real-world content would look like, and we're using it here to give the component a bit of body and size.</p>
    <a href="#" class="stretched-link">Go somewhere</a>
  </div>
</div>

识别包含块

如果拉伸链接似乎不起作用，包含块可能会是原因。以下 CSS 属性将使元素成为包含块：

position 值不为 static
transform 或 perspective 值不为 none
will-change 的值为 transform 或 perspective
filter （或 filter 的 will-change ）值不是 none （仅适用于 Firefox）

Card with stretched links

Some quick example text to build on the card title and make up the bulk of the card's content.

Stretched link will not work here, because position: relative is added to the link

This stretched link will only be spread over the p-tag, because a transform is applied to it.

<div class="card" style="width: 18rem;">
  <img src="..." class="card-img-top" alt="...">
  <div class="card-body">
    <h5 class="card-title">Card with stretched links</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    <p class="card-text">
      <a href="#" class="stretched-link text-danger" style="position: relative;">Stretched link will not work here, because <code>position: relative</code> is added to the link</a>
    </p>
    <p class="card-text bg-light" style="transform: rotate(0);">
      This <a href="#" class="text-warning stretched-link">stretched link</a> will only be spread over the <code>p</code>-tag, because a transform is applied to it.
    </p>
  </div>
</div>