DIV 底部而非页面底部的页脚。 Bootstrap

Question

我希望页脚位于页面底部。不在其所在 DIV 内容的底部。但我还希望页脚在打开和关闭页面侧栏时动态调整大小。

我花了太长时间尝试在 google 上可以找到的所有选项，但没有成功。我做过的最好的办法是让页脚横跨整个页面，包括重叠边栏，这不是我想要的。

旁注：

我还希望主要内容不滚动到页脚下方并停在上方。也就是说，如果这很容易实现，div 的滚动条就停在页脚上方？

查看 Facebook Messenger Web 以获得完美示例。左侧边栏和中心内容是我要找的内容。

有人可以帮忙吗？

示例 jsfille：

https://jsfiddle.net/pwdt95u8/1/

代码：

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

<head>

    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <!-- CSS only -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css"
          integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">

    <!-- JS, Popper.js, and jQuery -->
    <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"
            integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"
            crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"
            integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN"
            crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"
            integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV"
            crossorigin="anonymous"></script>
    <script src="https://kit.fontawesome.com/c551403873.js" crossorigin="anonymous"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.2.0/socket.io.js"
            integrity="sha256-yr4fRk/GU1ehYJPAs8P4JlTgu0Hdsp4ZKrx8bDEDC3I=" crossorigin="anonymous"></script>

    <!-- Custom styles for this template -->
    <link href="../static/css/simple-sidebar.css" rel="stylesheet">

</head>

<body>

<div class="d-flex" id="wrapper">

    <!-- Sidebar -->
    <div class="bg-light border-right" id="sidebar-wrapper">
        <div class="sidebar-heading">Start Bootstrap</div>
        <div class="list-group list-group-flush">
            <a href="#" class="list-group-item list-group-item-action bg-light">Dashboard</a>
            <a href="#" class="list-group-item list-group-item-action bg-light">Shortcuts</a>
            <a href="#" class="list-group-item list-group-item-action bg-light">Overview</a>
            <a href="#" class="list-group-item list-group-item-action bg-light">Events</a>
            <a href="#" class="list-group-item list-group-item-action bg-light">Profile</a>
            <a href="#" class="list-group-item list-group-item-action bg-light">Status</a>
        </div>
    </div>
    <!-- /#sidebar-wrapper -->

    <!-- Page Content -->
    <div id="page-content-wrapper">

        <nav class="navbar navbar-expand-lg navbar-light bg-light border-bottom">
            <button class="btn btn-primary" id="menu-toggle">Toggle Menu</button>

            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent"
                    aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>

            <div class="collapse navbar-collapse" id="navbarSupportedContent">
                <ul class="navbar-nav ml-auto mt-2 mt-lg-0">
                    <li class="nav-item active">
                        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Link</a>
                    </li>
                    <li class="nav-item dropdown">
                        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button"
                           data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            Dropdown
                        </a>
                        <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdown">
                            <a class="dropdown-item" href="#">Action</a>
                            <a class="dropdown-item" href="#">Another action</a>
                            <div class="dropdown-divider"></div>
                            <a class="dropdown-item" href="#">Something else here</a>
                        </div>
                    </li>
                </ul>
            </div>
        </nav>

        <div class="container-fluid h-100">
            <h1 class="mt-4">Simple Sidebar</h1>
            <div class="row text-left w-50">
            TEST


              <footer id="sticky-footer" class="float-bottom card-footer py-4 bg-dark text-white-50">
                <div class="container text-center">
                  <small>Copyright &copy; Your Website</small>
                </div>
              </footer>


        </div>
    </div>  <!-- /#page-content-wrapper -->

</div>
<!-- Footer -->



<!-- Menu Toggle Script -->
<script>
    $("#menu-toggle").click(function (e) {
        e.preventDefault();
        $("#wrapper").toggleClass("toggled");
    });
</script>

</body>

</html>

Answer 1

这最好用 CSS 网格解决。其实不需要做太多改动。我已将页脚移至 body 元素的最后一个子元素，并向 body 样式规则添加了一些属性。（我还进行了一些编辑，例如为 Vanilla JS 切换 JQuery）

我添加了切换文本按钮，这样您就可以在主要内容区域内轻松切换文本。

Here 是相同代码的 JFiddle。

document.getElementById('menu-toggle').addEventListener('click', () => {
  document.getElementById('wrapper').classList.toggle('toggled');
});


document.getElementById('text-toggle').addEventListener('click', () => {
  document.getElementById('lorem-ipsum').classList.toggle('hide-text');
});

body {
  display: grid;

  /*  last row is footer and takes whatever is its natural height.
   *  first row is rest of content and stretches to fill available space
   */ 

  grid-template-rows: 1fr auto;
  min-height: 100vh;
}

#wrapper {
  overflow-x: hidden;
}

#sticky-footer {
  flex-shrink: none;
}

#sidebar-wrapper {
  margin-left: -15rem;
  transition: margin 0.25s ease-out;
}

#sidebar-wrapper .sidebar-heading {
  padding: 0.875rem 1.25rem;
  font-size: 1.2rem;
}

#sidebar-wrapper .list-group {
  width: 15rem;
}

#page-content-wrapper {
  min-width: 100vw;
}

.hide-text {
  display: none;
}

#wrapper.toggled #sidebar-wrapper {
  margin-left: 0;
}

@media (min-width: 768px) {
  #sidebar-wrapper {
    margin-left: 0;
  }

  #page-content-wrapper {
    min-width: 0;
    width: 100%;
  }

  #wrapper.toggled #sidebar-wrapper {
    margin-left: -15rem;
  }
}

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

  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">

    <link href="main.css" rel="stylesheet"/>
  </head>

  <body>

    <div class="d-flex" id="wrapper">

      <div class="bg-light border-right" id="sidebar-wrapper">
        <div class="sidebar-heading">Start Bootstrap</div>
        <div class="list-group list-group-flush">
          <a href="#" class="list-group-item list-group-item-action bg-light">Dashboard</a>
          <a href="#" class="list-group-item list-group-item-action bg-light">Shortcuts</a>
          <a href="#" class="list-group-item list-group-item-action bg-light">Overview</a>
          <a href="#" class="list-group-item list-group-item-action bg-light">Events</a>
          <a href="#" class="list-group-item list-group-item-action bg-light">Profile</a>
          <a href="#" class="list-group-item list-group-item-action bg-light">Status</a>
        </div>
      </div>

      <div id="page-content-wrapper">

        <nav class="navbar navbar-expand-lg navbar-light bg-light border-bottom">
          <button class="btn btn-primary" id="menu-toggle">Toggle Menu</button>
        </nav>

        <div class="container-fluid">
          <h1 class="mt-4">Simple Sidebar</h1>
          <div class="p1">
            TESTing
            <br/>
            <button class="btn btn-primary" id="text-toggle">toggle text</button>
            <div id="lorem-ipsum">
            <p>

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.
            </p>
            <p>

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.
            </p>
            <p>

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.
            </p>
            </div>
          </div>
        </div>
      </div>
    </div>

    <footer id="sticky-footer" class="float-bottom card-footer py-4 bg-dark text-white-50">
      <div class="container text-center">
        <small>Copyright &copy; Your Website</small>
      </div>
    </footer>
    <script src="main.js"></script>
  </body>

</html>

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