垂直居中的 Bootstrap 模态窗口

Question

我想将我的模态集中在视口上（中间） 我尝试添加一些 CSS 属性

 .modal { position: fixed; top:50%; left:50%; }

我正在使用这个例子 http://jsfiddle.net/rniemeyer/Wjjnd/

我试过了

$("#MyModal").modal('show').css(
    {
        'margin-top': function () {
            return -($(this).height() / 2);
        },
        'margin-left': function () {
            return -($(this).width() / 2);
        }
    })

原文由 user2613813 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

这完成了工作：http: //jsfiddle.net/sRmLV/1140/

它使用 helper-div 和一些自定义 CSS。不需要 javascript 或 jQuery。

HTML （基于 Bootstrap 的 演示代码）

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

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="vertical-alignment-helper">
        <div class="modal-dialog vertical-align-center">
            <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>
                    <button type="button" class="btn btn-primary">Save changes</button>
                </div>
            </div>
        </div>
    </div>
</div>

CSS

 .vertical-alignment-helper {
    display:table;
    height: 100%;
    width: 100%;
    pointer-events:none; /* This makes sure that we can still click outside of the modal to close it */
}
.vertical-align-center {
    /* To center vertically */
    display: table-cell;
    vertical-align: middle;
    pointer-events:none;
}
.modal-content {
    /* Bootstrap sets the size of the modal in the modal-dialog class, we need to inherit it */
    width:inherit;
    max-width:inherit; /* For Bootstrap 4 - to avoid the modal window stretching full width */
    height:inherit;
    /* To center horizontally */
    margin: 0 auto;
    pointer-events: all;
}

原文由 RNobel 发布，翻译遵循 CC BY-SA 3.0 许可协议