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
使用css有一个最简单的方法:
.modal-dialog {
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
margin: auto;
width:500px;
height:300px;
}
就是这样。注意，它只需要应用到.modal-dialog容器div。
演示:https://jsfiddle.net/darioferrer/0ueu4dmy/
其他回答
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>
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);
});
});
没那么复杂。
请试试这个:
$(document).ready(function(){
var modalId = "#myModal";
resize: function(){
var new_margin = Math.ceil(($(window).height() - $(modalId).find('.modal-dialog').height()) / 2);
$(modalId).find('.modal-dialog').css('margin-top', new_margin + 'px');
}
$(window).resize(function(){
resize();
});
$(modalId).on('shown.bs.modal', function(){
resize();
});
});
$('#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 {
$('#modal-dialog').css('margin-top',
(userScreenHeight / 2) - (initModalHeight/2)); //center it if it does fit
}
});
我写的最普遍的解。动态计算对话框高度。(下一步可能是重新计算窗口大小的对话框的高度。)
JSfiddle: http://jsfiddle.net/8Fvg9/3/
// initialise on document ready
jQuery(document).ready(function ($) {
'use strict';
// CENTERED MODALS
// phase one - store every dialog's height
$('.modal').each(function () {
var t = $(this),
d = t.find('.modal-dialog'),
fadeClass = (t.is('.fade') ? 'fade' : '');
// render dialog
t.removeClass('fade')
.addClass('invisible')
.css('display', 'block');
// read and store dialog height
d.data('height', d.height());
// hide dialog again
t.css('display', '')
.removeClass('invisible')
.addClass(fadeClass);
});
// phase two - set margin-top on every dialog show
$('.modal').on('show.bs.modal', function () {
var t = $(this),
d = t.find('.modal-dialog'),
dh = d.data('height'),
w = $(window).width(),
h = $(window).height();
// if it is desktop & dialog is lower than viewport
// (set your own values)
if (w > 380 && (dh + 60) < h) {
d.css('margin-top', Math.round(0.96 * (h - dh) / 2));
} else {
d.css('margin-top', '');
}
});
});
