这个问题分为两部分:

当你不知道模态的确切高度时,你如何将模态垂直地放置在中心? 是否有可能有模态居中,并有溢出:auto在模态体,但只有当模态超过屏幕高度?

我试过用这个:

.modal-dialog {
  height: 80% !important;
  padding-top:10%;
}

.modal-content {
  height: 100% !important;
  overflow:visible;
}

.modal-body {
  height: 80%;
  overflow: auto;
}

当内容远远大于垂直屏幕尺寸时,这给了我所需要的结果,但对于较小的模式内容,这几乎是不可用的。


当前回答

在移动plantform中,它可能看起来有点不同,这是我的代码。

<div class="modal-container">
  <style>
  .modal-dialog{
    margin-top: 60%;
    width:80%;
    margin-left: 10%;
    margin-right: 10%;
    margin-bottom: 100%
  }
  @media screen and (orientation:landscape){
    .modal-dialog{
      margin-top: 70;
      width:80%;
      margin-left: 10%;
      margin-right: 10%;
      margin-bottom: 100%
    }
  }
  .modal-body{
    text-align: center;
  }
  .modal-body p{
    margin:14px 0px;
    font-size: 110%;
  }
  .modal-content{
    border-radius: 10px;
  }
  .modal-footer{
    padding:0px;
  }
  .modal-footer a{
    padding: 15px;
  }
  .modal-footer a:nth-child(1){
    border-radius: 0px 0px 0px 10px;
  }
  .modal-footer a:nth-child(2){
    border-radius: 0px 0px 10px 0px;
  }
  </style>
  <h2>Basic Modal Example</h2>
  <div data-toggle="modal" data-target="#myModal">Div for modal</div>
    <div class="modal fade" id="myModal" role="dialog">
      <div class="modal-dialog">
        <div class="modal-content">
          <div class="modal-body">
            <p>确定要取消本次订单嘛?</p>
          </div>
          <div class="modal-footer">
            <div class="btn-group btn-group-justified">
              <a href="#" class="btn btn-default" data-dismiss="modal">取消</a>
              <a href="#" class="btn btn-default" data-dismiss="modal">确定</a>
            </div>
          </div>
        </div>
      </div>
    </div>
</div>

其他回答

还有另一种解决方案,它将为窗口上的每个可见模态设置有效的位置。调整大小事件和show.bs.modal:

(function ($) {
    "use strict";
    function centerModal() {
        $(this).css('display', 'block');
        var $dialog  = $(this).find(".modal-dialog"),
            offset       = ($(window).height() - $dialog.height()) / 2,
            bottomMargin = parseInt($dialog.css('marginBottom'), 10);

        // Make sure you don't hide the top part of the modal w/ a negative margin if it's longer than the screen height, and keep the margin equal to the bottom margin of the modal
        if(offset < bottomMargin) offset = bottomMargin;
        $dialog.css("margin-top", offset);
    }

    $(document).on('show.bs.modal', '.modal', centerModal);
    $(window).on("resize", function () {
        $('.modal:visible').each(centerModal);

    });
})(jQuery);

我的解决方案

.modal-dialog-center {
    margin-top: 25%;
}

    <div id="waitForm" class="modal">
        <div class="modal-dialog modal-dialog-center">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
                    <h4 id="headerBlock" class="modal-title"></h4>
                </div>
                <div class="modal-body">
                    <span id="bodyBlock"></span>
                    <br/>
                    <p style="text-align: center">
                        <img src="@Url.Content("~/Content/images/progress-loader.gif")" alt="progress"/>
                    </p>   
                </div>
            </div>
        </div>
    </div>

试试这样做:

.popup__overlay {
    position: fixed;
    left:  0;
    top:  0;
    width: 100%;
    height: 100%;
    z-index: 999;
    text-align: center
    }
.popup {
    display: inline-block;
    vertical-align: middle
    } 
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);

将模式中心设置为屏幕

.modal {
  text-align: center;
  padding: 0!important;
}
.modal:before {
  content: '';
  display: inline-block;
  height: 100%;
  vertical-align: middle;
  margin-right: -4px;
}
.modal-dialog {
  display: inline-block;
  text-align: left;
  vertical-align: middle;
}