twitter-bootstrap 如何垂直居中模态？

How to vertically center modal?

提问by Rushabh Shah

I want to vertically center a modal. I searched a lot on Google but found nothing helpful. Here is my code:

我想垂直居中一个模态。我在谷歌上搜索了很多，但没有发现任何帮助。这是我的代码：

 function inactive(id, ths) {
   $("#confirmation").modal("show");
 }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="modal fade bs-example-modal-sm" id="confirmation" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel">
  <div class="modal-dialog modal-sm" 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">Are you sure you want to inactivate it?</h4>
      </div>
      <div class="modal-body">
        <div class="form-group">
          <input type="text" class="form-control" name="captcha" id="cval" placeholder="enter captcha">
        </div>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">No</button>
        <button type="button" class="btn btn-primary" id="yes">Yes</button>
      </div>
    </div>
  </div>
</div>

How can I center it vertically?

我怎样才能垂直居中？

回答by brk

Not tested but you can try this

未测试，但你可以试试这个

.yourElement{
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

回答by Saurav Rastogi

As it looks as a bootstrap modal, Checkout this Fiddle(jsFiddle).

由于它看起来像一个引导模式，请检查这个Fiddle(jsFiddle)。

Try

尝试

.modal-dialog {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) !important;
}

Hope this helps!

希望这可以帮助！

回答by Diana Quinteros G.

There is a specific bootstrap class (v4.1) for this:

为此有一个特定的引导程序类 (v4.1)：

Add .modal-dialog-centeredto .modal-dialogto vertically center the modal.

添加.modal-dialog- central到.modal-dialog以垂直居中模态。

Source: https://getbootstrap.com/docs/4.1/components/modal/#vertically-centered

来源：https: //getbootstrap.com/docs/4.1/components/modal/#vertically-central

回答by Kingsley Gyimah

By adding position and transform properties, you wouldn't get it to be centred across all widths and devices, plus calculating it all the time could be a tedious process. Here is what worked by styling just the '.modal-dialog' class

通过添加位置和变换属性，您不会让它在所有宽度和设备上居中，而且一直计算它可能是一个乏味的过程。这是仅通过样式设置 '.modal-dialog' 类而起作用的方法

/* Center a bootstrap modal Vertically and horizontally */

.modal-dialog {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
}

/* and Viola! */

回答by Lucian Davidescu

Easiest (not tested cross-browser but should be ok):

最简单（未经跨浏览器测试，但应该没问题）：

HTML:

HTML：

<div class="container">
<p>Container</p>
<div class="modal">
<p>Modal</p>
</div>
</div>

CSS:

CSS：

.container {
position:relative;
}

.modal {
position:absolute;
top:0;
bottom:0;
left:0;
right:0;
margin:auto; 
}

Here's the fiddle: http://jsfiddle.net/o9pbgnz5/

这是小提琴：http: //jsfiddle.net/o9pbgnz5/

It's important that you set both top:0andbottom:0. Then, margin-top:autoand margin-bottom:autoshould take care of the vertical centering. In this example, the shorthand 'margin:auto' centers it both horizontally and vertically.

设置top:0和很重要bottom:0。然后，margin-top:auto和margin-bottom:auto应采取垂直居中的照顾。在这个例子中，速记 'margin:auto' 将它水平和垂直居中。

P.S. Also works with position:fixed;

PS也适用于 position:fixed;

回答by Razia sultana

Try this:-

试试这个：-

// Vertical centered modals
// you can give custom class like this // var modalVerticalCenterClass = ".modal.modal-vcenter";

var modalVerticalCenterClass = ".modal";
function centerModals($element) {
    var $modals;
    if ($element.length) {
        $modals = $element;
    } else {
        $modals = $(modalVerticalCenterClass + ':visible');
    }
    $modals.each( function(i) {
        var $clone = $(this).clone().css('display', 'block').appendTo('body');
        var top = Math.round(($clone.height() - $clone.find('.modal-content').height()) / 2);
        top = top > 0 ? top : 0;
        $clone.remove();
        $(this).find('.modal-content').css("margin-top", top);
    });
}
$(modalVerticalCenterClass).on('show.bs.modal', function(e) {
    centerModals($(this));
});
$(window).on('resize', centerModals);

/* scroll fixes */
.modal-open .modal {
  padding-left: 0px !important;
  padding-right: 0px !important;
  overflow-y: scroll;
}

/* centering styles for jsbin */
html,
body {
  width:100%;
  height:100%;
}
html {
  display:table;
}
body {
  display:table-cell;
  vertical-align:middle;
}
body > .btn {
  display: block;
  margin: 0 auto;
}

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Bootstrap 3 vertically centered modal and scroll fixes</title>
    <meta name="description" content="Bootstrap 3 vertically centered modal and scroll fixes">
    <!-- include bootstrap -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css">
</head>
<body>
  
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
  Launch modal
</button>

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</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>
      </div>
    </div>
  </div>
</div>
  
<!-- include jQuery -->
<script src="https://code.jquery.com/jquery-1.10.2.min.js"></script>
  
<!-- include bootstrap -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script>
  
</body>
</html>