在侧边栏中获取一个 li 元素正确地粘在底部答案

【问题标题】：Getting a li-element in sidebar correctly stick at the bottom在侧边栏中获取一个 li 元素正确地粘在底部
【发布时间】：2022-01-18 01:59:24
【问题描述】：

我将 https://getbootstrap.com/docs/5.0/examples/dashboard/ 中的 dashboard 示例用于自定义页面。我现在正在尝试添加一个粘贴在侧边栏底部的li 元素（或第二个ul）。 li 应包含一个按钮，该按钮在侧边栏的整个宽度上延伸。我已经尝试添加fixed-bottom，它可以将li 元素放在底部，但按钮（width: 100%）现在延伸到整个页面。所以我不确定fixed-buttom 是否是正确的选择。

<div class="row">   
    <nav id="sidebarMenu" class="col-md-3 col-lg-2 d-md-block bg-light sidebar collapse">
        <div class="position-sticky pt-3">
            <ul class="nav flex-column mb-2">
                <li class="nav-item">1</li>
                <li class="nav-item">2</li>
                <li class="nav-item">3</li>
            </ul>
            <!-- this shall be sticky at the bottom of the sidebar -->
            <ul class="nav flex-column mb-2 fixed-bottom">
            <li>
                <div class="btn-group dropup" style="width:100%">
                <button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">my button</button>
                <ul class="dropdown-menu">
                    <li class="nav-item">1</li>
                    <li class="nav-item">2</li>
                </ul>
                </div>
            </li>
            </ul>
        </div>
    </nav>

    <main class="col-md-9 ms-sm-auto col-lg-10 px-md-4">
        <!-- CONTENT -->
    </main>
</div>

【问题讨论】：

标签： twitter-bootstrap bootstrap-5

【解决方案1】：

给你...

基本上，制作两个div 元素（upper_part 和lower_part）。添加以下 CSS：

#upper_part {
    height: 80%; /* 80% + 20% = 100% */
}

#lower_part {
    height: 20%; /* 80% + 20% = 100% */
    padding: 3%;
    padding-bottom: 10%;
}

.my_button {
    width: 100%; /* Make the button full-width. */
}

请参阅下面的 sn-p。

body {
  font-size: .875rem;
}

.feather {
  width: 16px;
  height: 16px;
  vertical-align: text-bottom;
}


/*
   * Sidebar
   */

.sidebar {
  position: fixed;
  top: 0;
  /* rtl:raw:
    right: 0;
    */
  bottom: 0;
  /* rtl:remove */
  left: 0;
  z-index: 100;
  /* Behind the navbar */
  padding: 48px 0 0;
  /* Height of navbar */
  box-shadow: inset -1px 0 0 rgba(0, 0, 0, .1);
}

@media (max-width: 767.98px) {
  .sidebar {
    top: 5rem;
  }
}

.sidebar-sticky {
  position: relative;
  top: 0;
  height: calc(100vh - 48px);
  padding-top: .5rem;
  overflow-x: hidden;
  overflow-y: auto;
  /* Scrollable contents if viewport is shorter than content. */
}

.sidebar .nav-link {
  font-weight: 500;
  color: #333;
}

.sidebar .nav-link .feather {
  margin-right: 4px;
  color: #727272;
}

.sidebar .nav-link.active {
  color: #2470dc;
}

.sidebar .nav-link:hover .feather,
.sidebar .nav-link.active .feather {
  color: inherit;
}

.sidebar-heading {
  font-size: .75rem;
  text-transform: uppercase;
}


/*
   * Navbar
   */

.navbar-brand {
  padding-top: .75rem;
  padding-bottom: .75rem;
  font-size: 1rem;
  background-color: rgba(0, 0, 0, .25);
  box-shadow: inset -1px 0 0 rgba(0, 0, 0, .25);
}

.navbar .navbar-toggler {
  top: .25rem;
  right: 1rem;
}

.navbar .form-control {
  padding: .75rem 1rem;
  border-width: 0;
  border-radius: 0;
}

.form-control-dark {
  color: #fff;
  background-color: rgba(255, 255, 255, .1);
  border-color: rgba(255, 255, 255, .1);
}

.form-control-dark:focus {
  border-color: transparent;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, .25);
}

#upper_part {
  height: 80%;
}

#lower_part {
  height: 20%;
  padding: 3%;
  padding-bottom: 10%;
}

.my_button {
  width: 100%;
}

<!DOCTYPE html>
<html lang='en'>

<head>

  <meta charset='UTF-8'>
  <meta http-equiv='X-UA-Compatible' content='IE=edge'>
  <meta name='viewport' content='width=device-width, initial-scale=1.0'>
  <title>Document</title>
  <link rel='stylesheet' href='https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/css/bootstrap.min.css' integrity='sha384-F3w7mX95PdgyTmZZMECAngseQB83DfGTowi0iMjiWaeVhAn4FJkqJByhZMI3AhiU' crossorigin='anonymous'>
  <script src='https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/js/bootstrap.min.js' integrity='sha384-skAcpIdS7UcVUC05LJ9Dxay8AXcDYfBJqt1CJ85S/CFujBsIzCIv+l9liuYLaMQ/' crossorigin='anonymous'></script>

</head>

<body>

  <header class="navbar navbar-dark sticky-top bg-dark flex-md-nowrap p-0 shadow">
    <a class="navbar-brand col-md-3 col-lg-2 me-0 px-3" href="#">Company name</a>
    <button class="navbar-toggler position-absolute d-md-none collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#sidebarMenu" aria-controls="sidebarMenu" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>
    <input class="form-control form-control-dark w-100" type="text" placeholder="Search" aria-label="Search">
    <div class="navbar-nav">
      <div class="nav-item text-nowrap">
        <a class="nav-link px-3" href="#">Sign out</a>
      </div>
    </div>
  </header>

  <div class="container-fluid">
    <div class="row">
      <nav id="sidebarMenu" class="col-md-3 col-lg-2 d-md-block bg-light sidebar collapse">
        <div class="position-sticky pt-3" id="upper_part">
          <ul class="nav flex-column">
            <li class="nav-item">
              <a class="nav-link active" aria-current="page" href="#">
                <span data-feather="home"></span> Dashboard
              </a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">
                <span data-feather="file"></span> Orders
              </a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">
                <span data-feather="shopping-cart"></span> Products
              </a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">
                <span data-feather="users"></span> Customers
              </a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">
                <span data-feather="bar-chart-2"></span> Reports
              </a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">
                <span data-feather="layers"></span> Integrations
              </a>
            </li>
          </ul>

          <h6 class="sidebar-heading d-flex justify-content-between align-items-center px-3 mt-4 mb-1 text-muted">
            <span>Saved reports</span>
            <a class="link-secondary" href="#" aria-label="Add a new report">
              <span data-feather="plus-circle"></span>
            </a>
          </h6>
          <ul class="nav flex-column mb-2">
            <li class="nav-item">
              <a class="nav-link" href="#">
                <span data-feather="file-text"></span> Current month
              </a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">
                <span data-feather="file-text"></span> Last quarter
              </a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">
                <span data-feather="file-text"></span> Social engagement
              </a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">
                <span data-feather="file-text"></span> Year-end sale
              </a>
            </li>
          </ul>

        </div>
        <div class="d-flex align-items-end" id="lower_part">
          <button type="button" class="btn btn-primary my_button">Yay, it works.</button>
        </div>

      </nav>

      <main class="col-md-9 ms-sm-auto col-lg-10 px-md-4">
        <div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
          <h1 class="h2">Dashboard</h1>
          <div class="btn-toolbar mb-2 mb-md-0">
            <div class="btn-group me-2">
              <button type="button" class="btn btn-sm btn-outline-secondary">Share</button>
              <button type="button" class="btn btn-sm btn-outline-secondary">Export</button>
            </div>
            <button type="button" class="btn btn-sm btn-outline-secondary dropdown-toggle">
                  <span data-feather="calendar"></span>
                  This week
                </button>
          </div>
        </div>

        <canvas class="my-4 w-100" id="myChart" width="900" height="380"></canvas>

        <h2>Section title</h2>
        <div class="table-responsive">
          <table class="table table-striped table-sm">
            <thead>
              <tr>
                <th scope="col">#</th>
                <th scope="col">Header</th>
                <th scope="col">Header</th>
                <th scope="col">Header</th>
                <th scope="col">Header</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td>1,001</td>
                <td>random</td>
                <td>data</td>
                <td>placeholder</td>
                <td>text</td>
              </tr>
              <tr>
                <td>1,002</td>
                <td>placeholder</td>
                <td>irrelevant</td>
                <td>visual</td>
                <td>layout</td>
              </tr>
              <tr>
                <td>1,003</td>
                <td>data</td>
                <td>rich</td>
                <td>dashboard</td>
                <td>tabular</td>
              </tr>
              <tr>
                <td>1,003</td>
                <td>information</td>
                <td>placeholder</td>
                <td>illustrative</td>
                <td>data</td>
              </tr>
              <tr>
                <td>1,004</td>
                <td>text</td>
                <td>random</td>
                <td>layout</td>
                <td>dashboard</td>
              </tr>
              <tr>
                <td>1,005</td>
                <td>dashboard</td>
                <td>irrelevant</td>
                <td>text</td>
                <td>placeholder</td>
              </tr>
              <tr>
                <td>1,006</td>
                <td>dashboard</td>
                <td>illustrative</td>
                <td>rich</td>
                <td>data</td>
              </tr>
              <tr>
                <td>1,007</td>
                <td>placeholder</td>
                <td>tabular</td>
                <td>information</td>
                <td>irrelevant</td>
              </tr>
              <tr>
                <td>1,008</td>
                <td>random</td>
                <td>data</td>
                <td>placeholder</td>
                <td>text</td>
              </tr>
              <tr>
                <td>1,009</td>
                <td>placeholder</td>
                <td>irrelevant</td>
                <td>visual</td>
                <td>layout</td>
              </tr>
              <tr>
                <td>1,010</td>
                <td>data</td>
                <td>rich</td>
                <td>dashboard</td>
                <td>tabular</td>
              </tr>
              <tr>
                <td>1,011</td>
                <td>information</td>
                <td>placeholder</td>
                <td>illustrative</td>
                <td>data</td>
              </tr>
              <tr>
                <td>1,012</td>
                <td>text</td>
                <td>placeholder</td>
                <td>layout</td>
                <td>dashboard</td>
              </tr>
              <tr>
                <td>1,013</td>
                <td>dashboard</td>
                <td>irrelevant</td>
                <td>text</td>
                <td>visual</td>
              </tr>
              <tr>
                <td>1,014</td>
                <td>dashboard</td>
                <td>illustrative</td>
                <td>rich</td>
                <td>data</td>
              </tr>
              <tr>
                <td>1,015</td>
                <td>random</td>
                <td>tabular</td>
                <td>information</td>
                <td>text</td>
              </tr>
            </tbody>
          </table>
        </div>
      </main>
    </div>
  </div>


  <script src="../assets/dist/js/bootstrap.bundle.min.js"></script>

  <script src="https://cdn.jsdelivr.net/npm/feather-icons@4.28.0/dist/feather.min.js" integrity="sha384-uO3SXW5IuS1ZpFPKugNNWqTZRRglnUJK6UAZ/gxOX80nxEkN9NcGZTftn6RzhGWE" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/chart.js@2.9.4/dist/Chart.min.js" integrity="sha384-zNy6FEbO50N+Cg5wap8IKA4M/ZnLJgzc6w2NqACZaK0u0FXfOWRRJOnQtpZun8ha" crossorigin="anonymous"></script>
  <script src="dashboard.js"></script>


</body>

</html>

【讨论】：