延伸链接（Stretched link）

透过CSS将链接“延伸”，令任何HTML元素或Bootstrap元件变得可点击。

On this page

在一个链接上添加.stretched-link将可以使它的containing block变得可点击，这是透过：：after虚拟元素达成的。在大多数的情况下，这意味着本身带有position: relative；，且内部包装了具有.stretched-link类别之链接的元素将变得可点击。

Bootstrap中卡片元件预设便带有position: relative，因此在这个情况下你可以安全的在卡片中的链接添加.stretched-link，而无须更改任何其他HTML。

对于拉伸链接，不建议使用多个链接和轻触目标。但是，如果需要， position和z-index样式可以帮助您。

Card image cap
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>

大多数自定义的元件并不预设带有position: relative，因此必须添加position: relative，避免链接延伸到父容器以外的地方。

Generic placeholder image
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>
Generic placeholder image
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

如果拉伸的链接似乎不起作用，则可能是包含块的原因。以下CSS属性将使元素成为包含块：

  • static以外的position值。
  • none以外的transform或perspective值。
  • 在transform或perspective使用will-change作为值。
  • none以外的filter值，或是在filter使用will-change作为值（只会在Firefox作用）。
Card image cap
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>
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