如何在Bootstrap Modal头上添加响应式背景图像？

时间：2017-04-05 03:21:31

标签： html css bootstrap-modal

我必须在模态标题中添加背景图像，它也应该是响应式的。我能够添加图像，但我在使其响应时遇到问题。任何帮助表示赞赏。

以下是示例代码段。

＆＃13;
＆＃13; 
.modal-header {
    border-bottom: none;
    padding: 15px 15px 0 15px;
    background-image: url(https://s9.postimg.org/ky3v3mduz/Jellyfish.jpg);
    height: 208px;
    background-size: contain;
    background-repeat: no-repeat;

    .close {
      background: none;
      border: none;
      float: right;
      font-size: 40px;
      line-height: 20px;
      padding: 0;

      &:hover {
        color: @hover-blush;
      }
    }
  }
  
}
＆＃13; 
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<body>

<div class="container">
  <h2</h2>
  <!-- Trigger the modal with a button -->
  <button type="button" class="btn" data-toggle="modal" data-target="#myModal">Open Modal</button>

  <!-- Modal -->
  <div class="modal fade" id="myModal" role="dialog">
    <div class="modal-dialog">
    
      <!-- Modal content-->
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal">&times;</button>
          <h4 class="modal-title">Modal Header</h4>
        </div>
        <div class="modal-body">
          <p>Some text in the modal.</p>
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
      </div>
      
    </div>
  </div>
  
</div>

</body>
＆＃13;
＆＃13;
＆＃13;

3 个答案:

答案 0 :(得分：2)

假设您希望图像的中心是始终显示的部分，请使用background-size: cover; background-position: center center;的组合。否则，根据需要进行调整，以确保显示图像的焦点。

.modal-header {
    border-bottom: none;
    padding: 15px 15px 0 15px;
    background-image: url(https://s9.postimg.org/ky3v3mduz/Jellyfish.jpg);
    height: 208px;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;

    .close {
      background: none;
      border: none;
      float: right;
      font-size: 40px;
      line-height: 20px;
      padding: 0;

      &:hover {
        color: @hover-blush;
      }
    }
  }
  
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<body>

<div class="container">
  <h2</h2>
  <!-- Trigger the modal with a button -->
  <button type="button" class="btn" data-toggle="modal" data-target="#myModal">Open Modal</button>

  <!-- Modal -->
  <div class="modal fade" id="myModal" role="dialog">
    <div class="modal-dialog">
    
      <!-- Modal content-->
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal">&times;</button>
          <h4 class="modal-title">Modal Header</h4>
        </div>
        <div class="modal-body">
          <p>Some text in the modal.</p>
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
      </div>
      
    </div>
  </div>
  
</div>

</body>

答案 1 :(得分：1)

要获得响应式背景图片，您要查找的是基于百分比的background-size。要完全覆盖内容区域，请使用：

.modal-header {
  background-size: 100% 100%;
  background-repeat: no-repeat;
}


.modal-header {
    border-bottom: none;
    padding: 15px 15px 0 15px;
    background-image: url(https://s9.postimg.org/ky3v3mduz/Jellyfish.jpg);
    height: 208px;
    background-size: 100% 100%;
    background-repeat: no-repeat;

    .close {
      background: none;
      border: none;
      float: right;
      font-size: 40px;
      line-height: 20px;
      padding: 0;

      &:hover {
        color: @hover-blush;
      }
    }
  }
  
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<body>

  <div class="container">
    <h2</h2>
      <!-- Trigger the modal with a button -->
      <button type="button" class="btn" data-toggle="modal" data-target="#myModal">Open Modal</button>

      <!-- Modal -->
      <div class="modal fade" id="myModal" role="dialog">
        <div class="modal-dialog">

          <!-- Modal content-->
          <div class="modal-content">
            <div class="modal-header">
              <button type="button" class="close" data-dismiss="modal">&times;</button>
              <h4 class="modal-title">Modal Header</h4>
            </div>
            <div class="modal-body">
              <p>Some text in the modal.</p>
            </div>
            <div class="modal-footer">
              <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
            </div>
          </div>

        </div>
      </div>

  </div>

</body>

请注意，这会扭曲图像，这可能不是您想要的。为了不扭曲图像，您应该只在background-size中指定一个参数，并告诉背景固定到中心：

.modal-header {
  background-size: 100%;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center;
}


.modal-header {
    border-bottom: none;
    padding: 15px 15px 0 15px;
    background-image: url(https://s9.postimg.org/ky3v3mduz/Jellyfish.jpg);
    height: 208px;
    background-size: 100%;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;

    .close {
      background: none;
      border: none;
      float: right;
      font-size: 40px;
      line-height: 20px;
      padding: 0;

      &:hover {
        color: @hover-blush;
      }
    }
  }
  
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<body>

  <div class="container">
    <h2</h2>
      <!-- Trigger the modal with a button -->
      <button type="button" class="btn" data-toggle="modal" data-target="#myModal">Open Modal</button>

      <!-- Modal -->
      <div class="modal fade" id="myModal" role="dialog">
        <div class="modal-dialog">

          <!-- Modal content-->
          <div class="modal-content">
            <div class="modal-header">
              <button type="button" class="close" data-dismiss="modal">&times;</button>
              <h4 class="modal-title">Modal Header</h4>
            </div>
            <div class="modal-body">
              <p>Some text in the modal.</p>
            </div>
            <div class="modal-footer">
              <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
            </div>
          </div>

        </div>
      </div>

  </div>

</body>

最终，考虑到模态标题本身永远不会改变高度，您可能只想使用<img>标记而不是background-image。

希望这有帮助！ ：）

答案 2 :(得分：0)

我认为您需要拥有的是尺寸合适的图片并更改背景尺寸。

// Try This
.jumbotron {
background: url("IMAGE PATH") rebeccapurple repeat center center;
color: white;
width: auto;
height: 350px;
margin-bottom: 100px;
position: relative;
display: block;
font-family: FontAwesome;

}

.modal-header {
    border-bottom: none;
    padding: 15px 15px 0 15px;
    background-image: url(http://www.bahai.org/chrome/img/beliefs/bahaullah-covenant-feature-img.jpg?3e7a0319);
    height: 208px;
    background-size: cover;
    background-repeat: no-repeat;
   

    .close {
      background: none;
      border: none;
      float: right;
      font-size: 40px;
      line-height: 20px;
      padding: 0;

      &:hover {
        color: @hover-blush;
      }
    }
  }
  
}

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