是否可以使用引导程序“col-”类设置“navbar-fixed-top”的宽度？答案

【问题标题】：Is it possible to set width of "navbar-fixed-top" using Bootstrap "col-" classes?是否可以使用引导程序“col-”类设置“navbar-fixed-top”的宽度？
【发布时间】：2020-04-09 00:15:36
【问题描述】：

我不使用引导程序“col-”类控制“navbar-fixed-top”的宽度。到目前为止，我发现的建议建议添加到 Bootstrap CSS 或使用“容器流体”，尽管我还没有弄清楚如何在后一个选项中使用“col--”来控制宽度。 p>

基本上，我想对以下脚本进行相同的操作，但将导航栏固定在顶部。

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Case</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
  <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
  <div class="col-md-2"></div>
  <div class="col-md-8">

    <nav class="navbar navbar-inverse">
      <div class="navbar-header">
        <a class="navbar-brand" href="#">WebSiteName</a>
      </div>
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li><a href="#">Page 1</a></li>
        <li><a href="#">Page 2</a></li>
        <li><a href="#">Page 3</a></li>
      </ul>
    </nav>

    <p>1. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>
    <p>2. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>
    <p>3. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>
    <p>4. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>

  </div>
  <div class="col-md-2"></div>
</body>
</html>

我已经使用this W3Schools page on navbar-fixed-top 来测试上面的 HTML。你有什么工作想法吗？

【问题讨论】：

标签： twitter-bootstrap navbar grid-layout

【解决方案1】：

您可以在 CSS 中设置固定导航栏的宽度，并使用自动边距将其居中。

.navbar-fixed-top {
  width: 75%;
  margin-left: auto;
  margin-right: auto;
}

CODEPEN

【讨论】：

【解决方案2】：

一旦您将position:fixed（如navbar-fixed-top）添加到任何元素，它就会从正常的页面流中删除，因此它在引导程序col-*s 中不会很好地工作。

最好只设置宽度并将导航栏与页面内容分开..

.navbar-fixed-top {
     width:66.66%; /* same as width of col-md-8 */
     margin:0 auto;
}

这是一个工作演示： http://codeply.com/go/ogg6K1uhGU

您会看到使用了媒体查询，以便导航栏在较小的屏幕上保持响应。

【讨论】：

不幸的是，此修复程序不会在调整浏览器大小期间模仿引导网格的行为。

【解决方案3】：

到目前为止，我使用的解决方案是使用 Bootstrap CSS 中的 .container。请参阅下面的脚本。到目前为止，我注意到的唯一缺陷是在浏览器调整大小的各个阶段，导航栏和内容的宽度存在像素级差异。

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Case</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
  <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

  <!-- start of css overwriting container, add 'container-overwrite' to <nav class> !-->
  <style>
    @media (min-width: 768px) {
    .container-overwrite{
        width:96.3%;
    }}

    @media (min-width: 992px) {
    .container-overwrite{
        width:63.7%;
    }}

    @media (min-width: 1200px) {
    .container-overwrite{
        width:64.7%;
    }}

    body {
          padding-top: 70px;
    }
  </style>
  <!-- end of css !-->

</head>
<body>

  <div class="col-md-2"></div>
  <div class="col-md-8">
    <div class="container">

      <nav class="navbar navbar-inverse navbar-fixed-top container container-overwrite">
        <div class="navbar-header">
          <a class="navbar-brand" href="#">WebSiteName</a>
        </div>
        <ul class="nav navbar-nav">
          <li class="active"><a href="#">Home</a></li>
          <li><a href="#">Page 1</a></li>
          <li><a href="#">Page 2</a></li>
          <li><a href="#">Page 3</a></li>
        </ul>
      </nav>
    </div>

    <p>1. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>
    <p>2. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>
    <p>3. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>
    <p>4. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>
  </div>
  <div class="col-md-2"></div>
</body>
</html>

【讨论】：

【解决方案4】：

解决方案是在您的代码中添加 <div class="container-fluid">，如下所示：

 <!DOCTYPE html>
    <html lang="en">
    <head>
      <title>Bootstrap Case</title>
      <meta charset="utf-8">
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
      <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    </head>
    <body>
      <div class="col-md-2"></div>
      <div class="col-md-8">

        <div class="navbar navbar-inverse">
         <div class="container-fluid">
          <div class="navbar-header">
            <a class="navbar-brand" href="#">WebSiteName</a>
          </div>
          <ul class="nav navbar-nav">
            <li class="active"><a href="#">Home</a></li>
            <li><a href="#">Page 1</a></li>
            <li><a href="#">Page 2</a></li>
            <li><a href="#">Page 3</a></li>
          </ul>
         </div>
        </div>

        <p>1. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>
        <p>2. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>
        <p>3. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>
        <p>4. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll. A fixed navigation bar stays visible in a fixed position (top or bottom) independent of the page scroll.</p>

      </div>
      <div class="col-md-2"></div>
    </body>
    </html>

【讨论】：