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
这是相当老的，并特别要求使用Bootstrap 3的解决方案，但任何人都想知道:从Bootstrap 4有一个内置的解决方案称为.modal-dialog-centered。问题是:https://github.com/twbs/bootstrap/issues/23638
所以使用v4，你只需要添加.modal-dialog- centric到.modal-dialog来垂直居中模态:
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModalCenter">
Launch demo modal
</button>
<!-- Modal -->
<div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
<div class="modal-dialog modal-dialog-centered" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalCenterTitle">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>
Demo
其他回答
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;
}
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
}
您可能想要查看这个div绝对居中的方法集合:http://codepen.io/shshaw/full/gEiDt
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;
}
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>
