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
最简单的解决方案是在页面顶部添加模态对话框样式，或者用下面的代码导入css:
<style>
.modal-dialog {
position:absolute;
top:50% !important;
transform: translate(0, -50%) !important;
-ms-transform: translate(0, -50%) !important;
-webkit-transform: translate(0, -50%) !important;
margin:auto 50%;
width:40%;
height:40%;
}
</style>
模态声明:
<div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLongTitle">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
...
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>
情态用法:
<a data-toggle="modal" data-target="#exampleModalCenter">
...
</a>
其他回答
这是响应式代码，也打开不同大小的移动视图，请检查一次。
.modal {
text-align: center;
padding: 0!important;
}
.modal:before {
content: '';
display: inline-block;
height: 20%;
vertical-align: middle;
margin-right: -4px;
}
.modal-dialog {
display: inline-block;
text-align: left;
vertical-align: middle;
}
.modal {
text-align: center;
}
@media screen and (min-width: 768px) {
.modal:before {
display: inline-block;
vertical-align: middle;
content: " ";
height: 100%;
}
}
.modal-dialog {
display: inline-block;
text-align: left;
vertical-align: middle;
}
并调整一点点。fade class，以确保它出现在窗口的顶部边界之外，而不是中心
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
}
我已经从bellow link下载了bootstrap3-dialog，并修改了bootstrap-dialog.js中的open函数
https://github.com/nakupanda/bootstrap3-dialog
Code
open: function () {
!this.isRealized() && this.realize();
this.updateClosable();
//Custom To Vertically centering Bootstrap
var $mymodal = this.getModal();
$mymodal = $mymodal.append('<table border="0" cellpadding="0" cellspacing="0" width="100%" height="100%"><tr><td align="center" valign="middle" class="centerModal"></td></tr></table>');
$mymodal = $mymodal.find(".modal-dialog").appendTo($mymodal.find(".centerModal"));
//END
this.getModal().modal('show');
return this;
}
Css
.centerModal .modal-header{
text-align:left;
}
.centerModal .modal-body{
text-align:left;
}
