css - 垂直居中 Angular Bootstrap 模式窗口

Question

无论显示的内容大小如何，我怎样才能垂直居中这个模态窗口。在我的页面中，我将图像显示为模态窗口，我希望它显示在屏幕中央。我可以水平对齐，但不能让它垂直对齐。有什么想法/例子吗？

我在我的页面中遵循了这个例子:modal window demo plunker

但是模态窗口的实际内容是这样的:

<script type="text/ng-template" id="myModalContent.html">
        <div>
             <img class= "attachmentImage" src={{items}} />
        </div>
</script>

我是否应该在 bootstrap.min.css 或 ui-bootstrap-tpls-0.13.0.js 中进行更改，或者是解决此问题的最佳方法在我自己的工作表中使用我的样式。

非常感谢您的宝贵时间。如果您需要更多信息或者我不清楚，请告诉我。

Answer 1

我强烈反对 1Bladesforhire的答案，因为 modal 容器的顶部在高于视口(viewport)高度时变得不可访问。当使用 absolute 垂直居中方法将比 parent 高的 child 居中时，这是一个常见问题。

我首选的垂直居中 Bootstrap 模态的方法是

.modal-dialog {
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow-y: auto;
  min-height: calc(100vh - 60px);
}
@media (max-width: 767px) {
  .modal-dialog {
    min-height: calc(100vh - 20px);
  }
}

/* you only need the above CSS. The code below centers the modal trigger button */

body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

<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/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>


<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
  Launch demo modal
</button>

<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
        
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

当 .modal-content 比视口(viewport)宽度短时垂直居中，即使它的高度为 300vh 仍可完全访问:

.modal-dialog {
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow-y: auto;
  min-height: calc(100vh - 60px);
}
@media (max-width: 767px) {
  .modal-dialog {
    min-height: calc(100vh - 20px);
  }
}

/* you only need the above CSS. The code below centers the modal trigger button */

.modal-content {
  height: 300vh;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

<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/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>


<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
  Launch demo modal
</button>

<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
        
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>