学习 Bootstrap 打通任督二脉(六)

本文旨在根据官方文档全面学习 Bootstrap. 学习其目标在于为之后使用其他更加高级的组件库打下坚实的基础。同时由于 Bootstrap 在移动端的亮眼表现,到目前为止,已经是不可逾越的技术点,因此在本文中,让我们下定决心一起突破,拿下 Bootstrap, 打通任督二脉。

列表组

最基本的列表组效果

html 复制代码
<ul class="list-group">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
  <li class="list-group-item">A fourth item</li>
  <li class="list-group-item">And a fifth one</li>
</ul>

结构为:ur.list-group > li.list-group-item * 4

添加了圆角。

首选项

使用 active 类名选择首选项。

ini 复制代码
<ul class="list-group">
  <li class="list-group-item active" aria-current="true">An active item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
  <li class="list-group-item">A fourth item</li>
  <li class="list-group-item">And a fifth one</li>
</ul>

禁用 item

使用 disabled 来禁用某个item.

使用 div>a 而不是 ul>li 实现

html 复制代码
<div class="list-group">
  <a href="#" class="list-group-item list-group-item-action active" aria-current="true">
    The current link item
  </a>
  <a href="#" class="list-group-item list-group-item-action">A second link item</a>
  <a href="#" class="list-group-item list-group-item-action">A third link item</a>
  <a href="#" class="list-group-item list-group-item-action">A fourth link item</a>
  <a class="list-group-item list-group-item-action disabled">A disabled link item</a>
</div>

其中,类 list-group-item-action 的作用就是让 item 被点击的时候有一个响应动画。

也可以使用 div>button 来实现,注意此时 disabled 是 attribute 而不是类名

html 复制代码
<div class="list-group">
  <button type="button" class="list-group-item list-group-item-action active" aria-current="true">
    The current button
  </button>
  <button type="button" class="list-group-item list-group-item-action">A second item</button>
  <button type="button" class="list-group-item list-group-item-action">A third button item</button>
  <button type="button" class="list-group-item list-group-item-action">A fourth button item</button>
  <button type="button" class="list-group-item list-group-item-action" disabled>A disabled button item</button>
</div>

使用 flush 取消外边框

准确来说是 list-group-flush

html 复制代码
<ul class="list-group list-group-flush">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
  <li class="list-group-item">A fourth item</li>
  <li class="list-group-item">And a fifth one</li>
</ul>

给 list 编号

我们在最外层组件上加上名为 list-group-numbered 的类,就可以给内部的 item 编号

html 复制代码
<ol class="list-group list-group-numbered">
  <li class="list-group-item">A list item</li>
  <li class="list-group-item">A list item</li>
  <li class="list-group-item">A list item</li>
</ol>

item 的背景色

使用 list-group-item-primary 等,就能够对其中的 item 施加背景色了,这个时候如果 active 就会颜色更深。

html 复制代码
<div class="list-group">
  <a href="#" class="list-group-item list-group-item-action">A simple default list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-primary active">A simple primary list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-secondary">A simple secondary list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-success">A simple success list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-danger">A simple danger list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-warning">A simple warning list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-info">A simple info list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-light">A simple light list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-dark">A simple dark list group item</a>
</div>

换个方向

在 list-group 上面添加 list-group-horizontal 类名就能够让表格从左向右。

html 复制代码
<ul class="list-group list-group-horizontal">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
</ul>

丰富 li 中的内容

html 复制代码
<ol class="list-group list-group-numbered">
  <li class="list-group-item d-flex justify-content-between align-items-start">
    <div class="ms-2 me-auto">
      <div class="fw-bold">Subheading</div>
      Content for list item
    </div>
    <span class="badge bg-primary rounded-pill">14</span>
  </li>
  <li class="list-group-item d-flex justify-content-between align-items-start">
    <div class="ms-2 me-auto">
      <div class="fw-bold">Subheading</div>
      Content for list item
    </div>
    <span class="badge bg-primary rounded-pill">14</span>
  </li>
  <li class="list-group-item d-flex justify-content-between align-items-start">
    <div class="ms-2 me-auto">
      <div class="fw-bold">Subheading</div>
      Content for list item
    </div>
    <span class="badge bg-primary rounded-pill">14</span>
  </li>
</ol>

左右布局的技巧:

  • 父 div 给 d-flex justify-content-between align-items-start
  • 左边给 ms-2 保证和左边的距离;给 ms-auto 把右边元素挤到最右边去
html 复制代码
  <li class="list-group-item d-flex justify-content-between align-items-start">
    <div class="ms-2 me-auto">
      <div class="fw-bold">Subheading</div>
      Content for list item
    </div>
    <span class="badge bg-primary rounded-pill">14</span>
  </li>

或者简单一些:

html 复制代码
<ul class="list-group">
  <li class="list-group-item d-flex justify-content-between align-items-center">
    A list item
    <span class="badge bg-primary rounded-pill">14</span>
  </li>
  <li class="list-group-item d-flex justify-content-between align-items-center">
    A second list item
    <span class="badge bg-primary rounded-pill">2</span>
  </li>
  <li class="list-group-item d-flex justify-content-between align-items-center">
    A third list item
    <span class="badge bg-primary rounded-pill">1</span>
  </li>
</ul>

list-group 和 checkbox

html 复制代码
<ul class="list-group">
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" aria-label="...">
    First checkbox
  </li>
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" aria-label="...">
    Second checkbox
  </li>
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" aria-label="...">
    Third checkbox
  </li>
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" aria-label="...">
    Fourth checkbox
  </li>
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" aria-label="...">
    Fifth checkbox
  </li>
</ul>

或者使用 label 代替 li 也是可以的,交互效果会更好!

html 复制代码
<div class="list-group">
  <label class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="">
    First checkbox
  </label>
  <label class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="">
    Second checkbox
  </label>
  <label class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="">
    Third checkbox
  </label>
  <label class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="">
    Fourth checkbox
  </label>
  <label class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="">
    Fifth checkbox
  </label>
</div>

注意这里的 label 需要将 input 包裹起来!

页码组件 -- pagination

最简单的页码组件

xml 复制代码
<nav aria-label="Page navigation example">
  <ul class="pagination">
    <li class="page-item"><a class="page-link" href="#">Previous</a></li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item"><a class="page-link" href="#">Next</a></li>
  </ul>
</nav>

这里分成最外层和次外层,最外层是 nav 次外层是 ul, 内部组件使用的是 li 标签。

  • ul.pagination
  • li.page-item
  • a.page-link

前进后退图标

整体的结构为:nav>ui>(li>a)*n 我们可以在 a 中放入图标,使组将更加生动,如下所示:

html 复制代码
<nav aria-label="Page navigation example">
  <ul class="pagination">
    <li class="page-item">
      <a class="page-link" href="#" aria-label="Previous">
        <span aria-hidden="true"><<</span>
      </a>
    </li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item">
      <a class="page-link" href="#" aria-label="Next">
        <span aria-hidden="true">>></span>
      </a>
    </li>
  </ul>
</nav>

激活以及禁用

我们可以在 page-item 上添加 active 或者 disabled 类名,使其能够处于激活或者禁用状态!

html 复制代码
<nav aria-label="...">
  <ul class="pagination">
    <li class="page-item disabled">
      <a class="page-link">Previous</a>
    </li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item active" aria-current="page">
      <a class="page-link" href="#">2</a>
    </li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item">
      <a class="page-link" href="#">Next</a>
    </li>
  </ul>
</nav>

对于上面被禁用的 Previous 按钮,更加推荐的是使用 span 标签而不是使用 a 标签:

html 复制代码
<nav aria-label="...">
  <ul class="pagination">
    <li class="page-item disabled">
      <span class="page-link">Previous</span>
    </li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item active" aria-current="page">
      <span class="page-link">2</span>
    </li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item">
      <a class="page-link" href="#">Next</a>
    </li>
  </ul>
</nav>

它们在样式层面上是完全等价的!

pagination 的文字大小

我们需要在 ul 元素或者 pagination 元素上添加如 pagination-lg 等类名改变元素的大小。

html 复制代码
<nav aria-label="...">
  <ul class="pagination pagination-lg">
    <li class="page-item active" aria-current="page">
      <span class="page-link">1</span>
    </li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
  </ul>
</nav>

pagination 的位置

在 ul 上使用 flx 布局修改页码组件的位置:

html 复制代码
<nav aria-label="Page navigation example">
  <ul class="pagination justify-content-center">
    <li class="page-item disabled">
      <a class="page-link">Previous</a>
    </li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item">
      <a class="page-link" href="#">Next</a>
    </li>
  </ul>
</nav>
html 复制代码
<nav aria-label="Page navigation example">
  <ul class="pagination justify-content-end">
    <li class="page-item disabled">
      <a class="page-link">Previous</a>
    </li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item">
      <a class="page-link" href="#">Next</a>
    </li>
  </ul>
</nav>

模态框组件

最基础的模态框

html 复制代码
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />

    <link
      href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css"
      rel="stylesheet"
      integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3"
      crossorigin="anonymous"
    />

    <title>Hello, world!</title>
  </head>
  <body>
    <!-- Button trigger modal -->
    <button
      type="button"
      class="btn btn-primary"
      data-bs-toggle="modal"
      data-bs-target="#exampleModal"
    >
      Launch demo modal
    </button>

    <!-- Modal -->
    <div
      class="modal fade"
      id="exampleModal"
      tabindex="-1"
      aria-labelledby="exampleModalLabel"
      aria-hidden="true"
    >
      <div class="modal-dialog">
        <div class="modal-content">
          <div class="modal-header">
            <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
            <button
              type="button"
              class="btn-close"
              data-bs-dismiss="modal"
              aria-label="Close"
            ></button>
          </div>
          <div class="modal-body">...</div>
          <div class="modal-footer">
            <button
              type="button"
              class="btn btn-secondary"
              data-bs-dismiss="modal"
            >
              Close
            </button>
            <button type="button" class="btn btn-primary">Save changes</button>
          </div>
        </div>
      </div>
    </div>

    <script
      src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"
      integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p"
      crossorigin="anonymous"
    ></script>
  </body>
</html>
  • div#exampleModal.modal.fade>.modal-dialog>.modal-content>.modal-header+.modal-body+.modal-footer: 一个最简单的 Modal 的结构。
  • class="modal fade": Modal 的最外层类名,在点击按钮弹开之后会新加 show 类名。
  • id="exampleModal": 内部元素,特别是按钮的引用点。
  • data-bs-toggle="modal" data-bs-target="#exampleModal": 弹出 Modal 的按钮上的类名和属性。
  • data-bs-dismiss="modal": 关闭模态框按钮的属性,注意这个按钮上面是不用指明 data-bs-target="#exampleModal" 的!
  • fade: 增加动画的类名。

模态框的大小

ini 复制代码
<div class="modal-dialog modal-xl">...</div>
<div class="modal-dialog modal-lg">...</div>
<div class="modal-dialog modal-sm">...</div>

大小体现在宽度而不是字体大小上!

全屏模态框

在 .modal-dialog 标签上设置名为 modal-fullscreen 的类名可以结合 break-points 指定模态框在某些屏幕尺寸下全屏。

html 复制代码
<!-- Full screen modal -->
<div class="modal-dialog modal-fullscreen-sm-down">
  ...
</div>

静态模态框

默认情况下,当模态框弹出之后,点击 mask 会导致模态框自动消失。如果想要取消这一默认的行为,可以在最外层或者 .mode 标签上面添加:data-bs-backdrop="static" data-bs-keyboard="false"。仁如此,点击 mask 就不会导致模态框消失了。

带滚动条的模态框

有的时候弹出来的模态框的高度过大,这个时候需要限制其高度在合理范围之内。在 .modal-dialog 标签上添加 modal-dialog-scrollable 这个类名即可!千万不要添加到最外层标签上去!

在高度方向上居中

模态框本身是在横向居中的,如果你想要让其在高度方向上也居中,也就是说需要其在正中间,这个时候需要给 .modal-dialog 元素上添加 modal-dialog-centered 这个类名。

html 复制代码
<div class="modal-body">
  <h5>Popover in a modal</h5>
  <p>This <a href="#" role="button" class="btn btn-secondary popover-test" title="Popover title" data-bs-content="Popover body content is set in this attribute.">button</a> triggers a popover on click.</p>
  <hr>
  <h5>Tooltips in a modal</h5>
  <p><a href="#" class="tooltip-test" title="Tooltip">This link</a> and <a href="#" class="tooltip-test" title="Tooltip">that link</a> have tooltips on hover.</p>
</div>

这没什么好说的!

ini 复制代码
<div class="modal-body">
  <div class="container-fluid">
    <div class="row">
      <div class="col-md-4">.col-md-4</div>
      <div class="col-md-4 ms-auto">.col-md-4 .ms-auto</div>
    </div>
    <div class="row">
      <div class="col-md-3 ms-auto">.col-md-3 .ms-auto</div>
      <div class="col-md-2 ms-auto">.col-md-2 .ms-auto</div>
    </div>
    <div class="row">
      <div class="col-md-6 ms-auto">.col-md-6 .ms-auto</div>
    </div>
    <div class="row">
      <div class="col-sm-9">
        Level 1: .col-sm-9
        <div class="row">
          <div class="col-8 col-sm-6">
            Level 2: .col-8 .col-sm-6
          </div>
          <div class="col-4 col-sm-6">
            Level 2: .col-4 .col-sm-6
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

打开模态框的时候传递数据进去并渲染 -- 此节最重要内容!!

这个功能只凭内部逻辑已经 hold 不住了,需要使用 JavaScript 了!原理其实非常的简单,那就是模态框被打开的时候会触发一个自定义事件。让模态框的最外层组件监听这个事件,监听到了就证明模态框打开了。这个时候 query 到输入框元素把信息传递过去即可!

html 复制代码
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />

    <link
      href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css"
      rel="stylesheet"
      integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3"
      crossorigin="anonymous"
    />

    <title>Hello, world!</title>
  </head>
  <body>
    <button
      type="button"
      class="btn btn-primary"
      data-bs-toggle="modal"
      data-bs-target="#exampleModal"
      data-bs-whatever="@mdo"
    >
      Open modal for @mdo
    </button>

    <div
      class="modal fade"
      id="exampleModal"
      tabindex="-1"
      aria-labelledby="exampleModalLabel"
      aria-hidden="true"
    >
      <div class="modal-dialog">
        <div class="modal-content">
          <div class="modal-header">
            <h5 class="modal-title" id="exampleModalLabel">New message</h5>
            <button
              type="button"
              class="btn-close"
              data-bs-dismiss="modal"
              aria-label="Close"
            ></button>
          </div>
          <div class="modal-body">
            <form>
              <div class="mb-3">
                <label for="recipient-name" class="col-form-label"
                  >Recipient:</label
                >
                <input type="text" class="form-control" id="recipient-name" />
              </div>
              <div class="mb-3">
                <label for="message-text" class="col-form-label"
                  >Message:</label
                >
                <textarea class="form-control" id="message-text"></textarea>
              </div>
            </form>
          </div>
          <div class="modal-footer">
            <button
              type="button"
              class="btn btn-secondary"
              data-bs-dismiss="modal"
            >
              Close
            </button>
            <button type="button" class="btn btn-primary">Send message</button>
          </div>
        </div>
      </div>
    </div>

    <script
      src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"
      integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p"
      crossorigin="anonymous"
    ></script>

    <script>
      window.onload = () => {
        var exampleModal = document.getElementById("exampleModal");
        exampleModal.addEventListener("show.bs.modal", function (event) {
          var button = event.relatedTarget;
          var recipient = button.getAttribute("data-bs-whatever");
          var modalTitle = exampleModal.querySelector(".modal-title");
          var modalBodyInput = exampleModal.querySelector(".modal-body input");

          modalTitle.textContent = "New message to " + recipient;
          modalBodyInput.value = recipient;
        });
      };
    </script>
  </body>
</html>

仿照上面的行为,我们可以监听模态框关闭时候触发的事件,在关闭之后清空它的内容,或者让其内容回到默认值。

js 复制代码
exampleModal.addEventListener("hide.bs.modal", function (event) {
  var modalTitle = exampleModal.querySelector(".modal-title");
  var modalBodyInput = exampleModal.querySelector(".modal-body input");

  modalTitle.textContent = "";
  modalBodyInput.value = "";
});
  • hide.bs.modal: 模态框关闭的时候的事件
  • show.bs.modal: 模态框打开的时候的事件

效果:

多级模态框及互相切换

原理:页面中同时只能出现一个模态框,当一个打开的时候其余自动就关闭了,据此我们只需要给响应的按钮绑定要打开的模态框的唯一标识就可以了。这个标识一般是 id, 而具有切换功能的按钮通常具有特殊的属性,如下所示:

html 复制代码
<button class="btn btn-primary" data-bs-target="#exampleModalToggle2" data-bs-toggle="modal">Open second modal</button>
html 复制代码
<button class="btn btn-primary" data-bs-target="#exampleModalToggle" data-bs-toggle="modal">Back to first</button></div>
html 复制代码
<a class="btn btn-primary" data-bs-toggle="modal" href="#exampleModalToggle" role="button">Open first modal</a>

完整代码如下:

html 复制代码
<div class="modal fade" id="exampleModalToggle" aria-hidden="true" aria-labelledby="exampleModalToggleLabel" tabindex="-1">
  <div class="modal-dialog modal-dialog-centered">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalToggleLabel">Modal 1</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      <div class="modal-body">
        Show a second modal and hide this one with the button below.
      </div>
      <div class="modal-footer">
        <button class="btn btn-primary" data-bs-target="#exampleModalToggle2" data-bs-toggle="modal">Open second modal</button>
      </div>
    </div>
  </div>
</div>
<div class="modal fade" id="exampleModalToggle2" aria-hidden="true" aria-labelledby="exampleModalToggleLabel2" tabindex="-1">
  <div class="modal-dialog modal-dialog-centered">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalToggleLabel2">Modal 2</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      <div class="modal-body">
        Hide this modal and show the first with the button below.
      </div>
      <div class="modal-footer">
        <button class="btn btn-primary" data-bs-target="#exampleModalToggle" data-bs-toggle="modal">Back to first</button>
      </div>
    </div>
  </div>
</div>
<a class="btn btn-primary" data-bs-toggle="modal" href="#exampleModalToggle" role="button">Open first modal</a>
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