正确的Jumbotron图像尺寸

时间：2017-03-22 19:07:56

标签： html css image twitter-bootstrap

我在bootstrap中使用jumbotron容器并尝试使用图像作为背景。但是，似乎所有图像都会因屏幕尺寸变化而扭曲，或者不显示照片的正确部分。是否有正确的尺寸我应该设置保存我的图像？还是一种摆脱/最小化屏幕大小失真的方法？如有必要，我可以告诉你我的代码。

提前致谢！

CSS：

*{
    margin: 0;
    padding: 0;
}

.navbar-default{
    background-color: rgb(66, 134, 244);
}
.under {
    border-bottom: 15px solid rgb(66, 134, 244);
}
.size {
    width: 300px;
}
.jumbotron{
    height: 400px;
    background: url("../images/parakeet.jpg");
    background-size: cover;
}

HTML
<!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="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  <link href="css/custom.css" rel="stylesheet">
</head>
<body>

<nav class="navbar navbar-default navbar-fixed-top">
  <div class="container-fluid">
    <div class="navbar-header">

<!-- Button nav for small screens -->

    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>                        
      </button>
<!-- Brand name -->

      <a class="navbar-brand" href="#">WebSiteName</a>
    </div>

<!-- Makes nav not expand on resize -->

    <div class="collapse navbar-collapse" id="myNavbar">

<!-- Menu -->
    <ul class="nav navbar-nav">
      <li class="active"><a href="#">Home</a></li>

<!-- Dropdown menu -->
      <li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Page 1 <span class="caret"></span></a>
        <ul class="dropdown-menu">
          <li><a href="#">Page 1-1</a></li>
          <li><a href="#">Page 1-2</a></li>
          <li><a href="#">Page 1-3</a></li>
        </ul>
      </li>
<!-- Non dropdown -->
      <li><a href="#">Page 2</a></li>
      <li><a href="#">Page 3</a></li>
    </ul>
  </div>
    </div>
</nav>
      <div class="jumbotron text-center under">
    <h1>Website Heading</h1>
      <p>Information about the website!</p>
    </div>
    <div class="container">
        <div class="row">
            <div class="col-sm-4 text-center">
                <h2>Text</h2>
                <p>More text describing the heading!</p>
                <span class="glyphicon glyphicon-leaf size"></span>

            </div>
                    <div class="col-sm-4 text-center">
                <h2>Text</h2>
                <p>More text describing the heading!</p>
                <span class="glyphicon glyphicon-hourglass btn-lg"></span>

            </div>

            <div class="col-sm-4 text-center">
                <h2>Text</h2>
                <p>More text describing the heading!</p>
                <span class="glyphicon glyphicon-plus btn-lg"></span>
            </div>

        </div>

    </div>
</body>
</html>

4 个答案:

答案 0 :(得分：1)

这很好。现在你需要玩background-position 现在，如果您运行此代码。你会看到一些可爱的狗的图像。现在在较小的设备上你会看到3只中间犬。为什么？因为background-position在x上设置为50％，在y上设置为50％（图像的中心）

让我们说在手机上你想要用黑头显示最合适的小狗。这很简单，你只需将background-position设置为100％和50％即可。 

*{
    margin: 0;
    padding: 0;
}

.navbar-default{
    background-color: rgb(66, 134, 244);
}
.under {
    border-bottom: 15px solid rgb(66, 134, 244);
}
.size {
    width: 300px;
}
.jumbotron{
    height: 400px;
    background: url("https://puppydogweb.com/wp-content/uploads/2015/05/54_2383_Cute-Puppies-puppies-16094619-1280-800.jpg");
    background-size: cover;
    background-position: 0 50%;
}
<body>

<nav class="navbar navbar-default navbar-fixed-top">
  <div class="container-fluid">
    <div class="navbar-header">

<!-- Button nav for small screens -->

    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>                        
      </button>
<!-- Brand name -->

      <a class="navbar-brand" href="#">WebSiteName</a>
    </div>

<!-- Makes nav not expand on resize -->

    <div class="collapse navbar-collapse" id="myNavbar">

<!-- Menu -->
    <ul class="nav navbar-nav">
      <li class="active"><a href="#">Home</a></li>

<!-- Dropdown menu -->
      <li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Page 1 <span class="caret"></span></a>
        <ul class="dropdown-menu">
          <li><a href="#">Page 1-1</a></li>
          <li><a href="#">Page 1-2</a></li>
          <li><a href="#">Page 1-3</a></li>
        </ul>
      </li>
<!-- Non dropdown -->
      <li><a href="#">Page 2</a></li>
      <li><a href="#">Page 3</a></li>
    </ul>
  </div>
    </div>
</nav>
      <div class="jumbotron text-center under">
    <h1>Website Heading</h1>
      <p>Information about the website!</p>
    </div>
    <div class="container">
        <div class="row">
            <div class="col-sm-4 text-center">
                <h2>Text</h2>
                <p>More text describing the heading!</p>
                <span class="glyphicon glyphicon-leaf size"></span>

            </div>
                    <div class="col-sm-4 text-center">
                <h2>Text</h2>
                <p>More text describing the heading!</p>
                <span class="glyphicon glyphicon-hourglass btn-lg"></span>

            </div>

            <div class="col-sm-4 text-center">
                <h2>Text</h2>
                <p>More text describing the heading!</p>
                <span class="glyphicon glyphicon-plus btn-lg"></span>
            </div>

        </div>

    </div>
</body>

所有具有分辨率＆lt;平板电脑分辨率将看到黑头小狗。 

@media (max-width: 768px) {
  .jumbotron{
    background-position: 100% 50%;
  }
}

答案 1 :(得分：1)

您应该将以下规则添加到.jumbotron 

background-repeat:no-repeat;
background-size:contain;
background-position:center;

答案 2 :(得分：0)

要拥有jumbotron比例并始终显示完整的背景图像，请调整jumbotron 0的高度，然后使用与图像的纵横比匹配的填充百分比来创建相同数量的填充jumbotron。

图像为1920x1080。代表百分比，1080/1920 = 56.25％。应用为顶部或底部填充，这将使jumbotron与纵横比匹配。然后你可以把文本放在jumbotron里面，无论你想要什么。我为此引入了一个名为.jumbotron-text的元素。

＆＃13;
＆＃13; 
* {
  margin: 0;
  padding: 0;
}

.navbar-default {
  background-color: rgb(66, 134, 244);
}

.under {
  border-bottom: 15px solid rgb(66, 134, 244);
}

.size {
  width: 300px;
}

.jumbotron-text {
  position: absolute;
  top: 2em;
  left: 0;
  right: 0;
}

.jumbotron {
  height: 0;
  position: relative;
  padding: 56.25% 0 0 !important;
  background: url('http://i.imgur.com/OXMygdn.jpg') 0 0 no-repeat;
  background-size: cover;
}
＆＃13; 
<!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="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  <link href="css/custom.css" rel="stylesheet">
</head>

<body>

  <nav class="navbar navbar-default navbar-fixed-top">
    <div class="container-fluid">
      <div class="navbar-header">

        <!-- Button nav for small screens -->

        <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>                        
      </button>
        <!-- Brand name -->

        <a class="navbar-brand" href="#">WebSiteName</a>
      </div>

      <!-- Makes nav not expand on resize -->

      <div class="collapse navbar-collapse" id="myNavbar">

        <!-- Menu -->
        <ul class="nav navbar-nav">
          <li class="active"><a href="#">Home</a></li>

          <!-- Dropdown menu -->
          <li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Page 1 <span class="caret"></span></a>
            <ul class="dropdown-menu">
              <li><a href="#">Page 1-1</a></li>
              <li><a href="#">Page 1-2</a></li>
              <li><a href="#">Page 1-3</a></li>
            </ul>
          </li>
          <!-- Non dropdown -->
          <li><a href="#">Page 2</a></li>
          <li><a href="#">Page 3</a></li>
        </ul>
      </div>
    </div>
  </nav>
  <div class="jumbotron text-center under">
    <div class="jumbotron-text">
      <h1>Website Heading</h1>
      <p>Information about the website!</p>
    </div>
  </div>
  <div class="container">
    <div class="row">
      <div class="col-sm-4 text-center">
        <h2>Text</h2>
        <p>More text describing the heading!</p>
        <span class="glyphicon glyphicon-leaf size"></span>

      </div>
      <div class="col-sm-4 text-center">
        <h2>Text</h2>
        <p>More text describing the heading!</p>
        <span class="glyphicon glyphicon-hourglass btn-lg"></span>

      </div>

      <div class="col-sm-4 text-center">
        <h2>Text</h2>
        <p>More text describing the heading!</p>
        <span class="glyphicon glyphicon-plus btn-lg"></span>
      </div>

    </div>

  </div>
</body>

</html>
＆＃13;
＆＃13;
＆＃13;

答案 3 :(得分：-1)

在等待代码时，您是否将响应类添加到图像标记中？

<img src="picture.jpg" class="img-responsive">

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