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
下面是另一个css方法，它的工作原理非常好: http://zerosixthree.se/vertical-align-anything-with-just-3-lines-of-css/
萨斯:
.modal {
height: 100%;
.modal-dialog {
top: 50% !important;
margin-top:0;
margin-bottom:0;
}
//keep proper transitions on fade in
&.fade .modal-dialog {
transform: translateY(-100%) !important;
}
&.in .modal-dialog {
transform: translateY(-50%) !important;
}
}
其他回答
$('#myModal').on('shown.bs.modal', function() {
var initModalHeight = $('#modal-dialog').outerHeight(); //give an id to .mobile-dialog
var userScreenHeight = $(document).outerHeight();
if (initModalHeight > userScreenHeight) {
$('#modal-dialog').css('overflow', 'auto'); //set to overflow if no fit
} else {
$('#modal-dialog').css('margin-top',
(userScreenHeight / 2) - (initModalHeight/2)); //center it if it does fit
}
});
您可能想要查看这个div绝对居中的方法集合:http://codepen.io/shshaw/full/gEiDt
使用这个简单的脚本将情态动词居中。
如果你愿意，你可以设置一个自定义类(例如:.modal。mode -vcenter(而不是.modal)来限制某些模式的功能。
var modalVerticalCenterClass = ".modal";
function centerModals($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);
还添加了这个CSS修复模式的水平间距;我们在模态上显示滚动，主体滚动被Bootstrap自动隐藏:
/* scroll fixes */
.modal-open .modal {
padding-left: 0px !important;
padding-right: 0px !important;
overflow-y: scroll;
}
一个简单的方法。为我工作。谢谢rensdenobel:) http://jsfiddle.net/rensdenobel/sRmLV/13/
<style>
.vertical-alignment-helper {
display:table;
height: 100%;
width: 100%;
}
.vertical-align-center {
/* To center vertically */
display: table-cell;
vertical-align: middle;
}
.modal-content {
/* Bootstrap sets the size of the modal in the modal-dialog class, we need to inherit it */
width:inherit;
height:inherit;
/* To center horizontally */
margin: 0 auto;
}
</style>
<!-- Button trigger modal -->
<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">×</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>
下面是另一个css方法，它的工作原理非常好: http://zerosixthree.se/vertical-align-anything-with-just-3-lines-of-css/
萨斯:
.modal {
height: 100%;
.modal-dialog {
top: 50% !important;
margin-top:0;
margin-bottom:0;
}
//keep proper transitions on fade in
&.fade .modal-dialog {
transform: translateY(-100%) !important;
}
&.in .modal-dialog {
transform: translateY(-50%) !important;
}
}
