导航栏和头部固定顶部答案

【问题标题】：Navbar and THead Fixed-Top导航栏和头部固定顶部
【发布时间】：2023-03-21 19:44:01
【问题描述】：

我正在创建一个简单的站点，该站点将显示计算机列表及其一些信息。到目前为止，除了滚动时无法让标题保持固定在导航栏上之外，我的所有功能几乎都按我想要的方式运行。我对这一切还是很陌生，但我将在下面列出我尝试过的一些事情以及我的网页的简化版本。

通过广告在导航栏/表格周围放置一个 div：不滚动
使 tbody 可滚动并固定 navbar/thead 的位置：破坏格式
仅将固定位置应用于前导：也会破坏格式

非常感谢任何帮助！

HTML

    <nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-dark">
  <a class="navbar-brand" href="#">Navbar</a>
  <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 mr-auto">
      <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>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input id="myInput" onkeyup="myFunction()" class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
    </form>
  </div>
</nav>
<br><br>
<table id="myTable" class="table table-striped table-hover tablesorter">
  <thead>
    <tr>
      <th scope="col">Status</th>
      <th scope="col">Computer</th>
      <th scope="col">IP Address</th>
      <th scope="col">MAC</th>
    </tr>
  </thead>
  <tbody id="myTableSearch">
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 1</td>
      <td>192.168.1.21</td>
      <td>92:41:04:FF:15:EB</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 2</td>
      <td>192.168.1.22</td>
      <td>5C:3B:C8:EA:6C:3A</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 3</td>
      <td>192.168.1.23</td>
      <td>BD:2D:94:8A:63:83</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 4</td>
      <td>192.168.1.24</td>
      <td>9C:D7:16:1F:0B:A3</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 5</td>
      <td>192.168.1.25</td>
      <td>05:C4:95:A6:B2:E6</td>
    </tr>
     <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 1</td>
      <td>192.168.1.21</td>
      <td>92:41:04:FF:15:EB</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 2</td>
      <td>192.168.1.22</td>
      <td>5C:3B:C8:EA:6C:3A</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 3</td>
      <td>192.168.1.23</td>
      <td>BD:2D:94:8A:63:83</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 4</td>
      <td>192.168.1.24</td>
      <td>9C:D7:16:1F:0B:A3</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 5</td>
      <td>192.168.1.25</td>
      <td>05:C4:95:A6:B2:E6</td>
    </tr>
     <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 1</td>
      <td>192.168.1.21</td>
      <td>92:41:04:FF:15:EB</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 2</td>
      <td>192.168.1.22</td>
      <td>5C:3B:C8:EA:6C:3A</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 3</td>
      <td>192.168.1.23</td>
      <td>BD:2D:94:8A:63:83</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 4</td>
      <td>192.168.1.24</td>
      <td>9C:D7:16:1F:0B:A3</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 5</td>
      <td>192.168.1.25</td>
      <td>05:C4:95:A6:B2:E6</td>
    </tr>
     <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 1</td>
      <td>192.168.1.21</td>
      <td>92:41:04:FF:15:EB</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 2</td>
      <td>192.168.1.22</td>
      <td>5C:3B:C8:EA:6C:3A</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 3</td>
      <td>192.168.1.23</td>
      <td>BD:2D:94:8A:63:83</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 4</td>
      <td>192.168.1.24</td>
      <td>9C:D7:16:1F:0B:A3</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 5</td>
      <td>192.168.1.25</td>
      <td>05:C4:95:A6:B2:E6</td>
    </tr>
  </tbody>
</table>

$(function() {
  $("#myTable").tablesorter();
});

    $(document).ready(function(){
      $("#myInput").on("keyup", function() {
        var value = $(this).val().toLowerCase();
        $("#myTableSearch tr").filter(function() {
          $(this).toggle($(this).text().toLowerCase().indexOf(value) > -1)
        });
      });
});

https://jsfiddle.net/80Lt2d6p/

【问题讨论】：

标签： javascript jquery html twitter-bootstrap

【解决方案1】：

我们可以使用here提供的答案作为起点，进行以下修改：

.table-fixed {
  width: 100%;
}

.table-fixed thead th {
    position: sticky;
    position: -webkit-sticky;
    /*top: 0;*/
    top:55px; /* the height of the fixed nav-bar */
    z-index: 999;
    background-color: #000;
    color: #fff;
}

现在删除HTML 中nav-bar 之后的<br>。

<nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-dark">
  <a class="navbar-brand" href="#">Navbar</a>
  <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 mr-auto">
      <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>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input id="myInput" onkeyup="myFunction()" class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
    </form>
  </div>
</nav>
<!-- remove the br from here, we will tackle this with the top:55px -->

这是一个更新的 JSFiddle：
DEMO

【讨论】：

【解决方案2】：

也许这会对你有所帮助这是一个基于你自己的小提琴。

1st）通过一些简单的检查来修复thead，如下所示

$(window).scroll(function() {
if ($(this).scrollTop() >= 100) { 
    $('#myTable').addClass('fixed');  
} else {
            $('#myTable').removeClass('fixed');
    }
});

2nd) 应用一些 css

#myTable.fixed thead { 
  position: fixed; background: #dddddd;
  left: 0; width: 100%;
}

我不确定哪种格式被破坏了，如果你在谈论 th 那么你可以用一些 css 来设置它

https://jsfiddle.net/bLjdhc9x/1/

【讨论】：

【解决方案3】：

.table-area {
  position: relative;
  z-index: 0;
  margin-top: 60px;
}

table.rajresponsive-table {
  display: table;
 
  table-layout: fixed;
  
  width: 100%;
 
  height: 100%;
}

table.rajresponsive-table thead {
  position: fixed;
  top: 50px;
  left: 0;
  right: 0;
  width: 100%;
  height: 50px;
  line-height: 3em;
  
  table-layout: fixed;
  display: table;
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet"/>

<nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-dark">
  <a class="navbar-brand" href="#">Navbar</a>
  <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 mr-auto">
      <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>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input id="myInput" onkeyup="myFunction()" class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
    </form>
  </div>
</nav>
<br><br>
<section class="content-area">
  <div class="table-area">
    <table class="rajresponsive-table table">
  <thead>
    <tr>
      <th scope="col">Status</th>
      <th scope="col">Computer</th>
      <th scope="col">IP Address</th>
      <th scope="col">MAC</th>
    </tr>
  </thead>
  <tbody id="myTableSearch">
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 1</td>
      <td>192.168.1.21</td>
      <td>92:41:04:FF:15:EB</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 2</td>
      <td>192.168.1.22</td>
      <td>5C:3B:C8:EA:6C:3A</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 3</td>
      <td>192.168.1.23</td>
      <td>BD:2D:94:8A:63:83</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 4</td>
      <td>192.168.1.24</td>
      <td>9C:D7:16:1F:0B:A3</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 5</td>
      <td>192.168.1.25</td>
      <td>05:C4:95:A6:B2:E6</td>
    </tr>
     <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 1</td>
      <td>192.168.1.21</td>
      <td>92:41:04:FF:15:EB</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 2</td>
      <td>192.168.1.22</td>
      <td>5C:3B:C8:EA:6C:3A</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 3</td>
      <td>192.168.1.23</td>
      <td>BD:2D:94:8A:63:83</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 4</td>
      <td>192.168.1.24</td>
      <td>9C:D7:16:1F:0B:A3</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 5</td>
      <td>192.168.1.25</td>
      <td>05:C4:95:A6:B2:E6</td>
    </tr>
     <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 1</td>
      <td>192.168.1.21</td>
      <td>92:41:04:FF:15:EB</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 2</td>
      <td>192.168.1.22</td>
      <td>5C:3B:C8:EA:6C:3A</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 3</td>
      <td>192.168.1.23</td>
      <td>BD:2D:94:8A:63:83</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 4</td>
      <td>192.168.1.24</td>
      <td>9C:D7:16:1F:0B:A3</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 5</td>
      <td>192.168.1.25</td>
      <td>05:C4:95:A6:B2:E6</td>
    </tr>
     <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 1</td>
      <td>192.168.1.21</td>
      <td>92:41:04:FF:15:EB</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 2</td>
      <td>192.168.1.22</td>
      <td>5C:3B:C8:EA:6C:3A</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 3</td>
      <td>192.168.1.23</td>
      <td>BD:2D:94:8A:63:83</td>
    </tr>
    <tr>
      <td><span class="badge badge-success">Online</span></td>
      <td>Computer 4</td>
      <td>192.168.1.24</td>
      <td>9C:D7:16:1F:0B:A3</td>
    </tr>
    <tr>
      <td><span class="badge badge-danger">Offline</span></td>
      <td>Computer 5</td>
      <td>192.168.1.25</td>
      <td>05:C4:95:A6:B2:E6</td>
    </tr>
  </tbody>
</table>
 </div>
</section>

【讨论】：

@StaticBeagle 位置：粘性；位置：-webkit-sticky；不支持某些浏览器