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
$('#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
}
});
其他回答
它可以简单地可以固定显示:伸缩
.modal-dialog {
margin-top: 0;
margin-bottom: 0;
height: 100vh;
display: flex;
flex-direction: column;
justify-content: center;
}
.modal.fade .modal-dialog {
transform: translate(0, -100%);
}
.modal.in .modal-dialog {
transform: translate(0, 0);
}
与前缀
.modal-dialog {
margin-top: 0;
margin-bottom: 0;
height: 100vh;
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-box-orient: vertical;
-webkit-box-direction: normal;
-webkit-flex-direction: column;
-ms-flex-direction: column;
flex-direction: column;
-webkit-box-pack: center;
-webkit-justify-content: center;
-ms-flex-pack: center;
justify-content: center;
}
.modal.fade .modal-dialog {
-webkit-transform: translate(0, -100%);
transform: translate(0, -100%);
}
.modal.in .modal-dialog {
-webkit-transform: translate(0, 0);
transform: translate(0, 0);
}
考虑使用这里找到的bootstrap-modal插件https://github.com/jschr/bootstrap-modal
这个插件会集中你所有的情态动词
从这里找到了完美的解决方案
$(function() {
function reposition() {
var modal = $(this),
dialog = modal.find('.modal-dialog');
modal.css('display', 'block');
// Dividing by two centers the modal exactly, but dividing by three
// or four works better for larger screens.
dialog.css("margin-top", Math.max(0, ($(window).height() - dialog.height()) / 2));
}
// Reposition when a modal is shown
$('.modal').on('show.bs.modal', reposition);
// Reposition when the window is resized
$(window).on('resize', function() {
$('.modal:visible').each(reposition);
});
});
在我的例子中，我所做的就是在css中设置顶部，知道模态的高度
<div id="myModal" class="modal fade">…< / div >
在我的CSS中
#myModal{
height: 400px;
top: calc(50% - 200px) !important;
}
$('#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
}
});
