加载 twitter bootstrap 模式对话框时，如何防止正文滚动条和移动? [英] How can I prevent body scrollbar and shifting when twitter bootstrap modal dialog is loaded?
问题描述
当我打开 twitter bootstrap 模式对话框时，背景会导致滚动条并移动内容.
When I open the twitter bootstrap modal dialog, the backdrop causes a scrollbar and shift the content.
为了避免滚动条，我使用了这个 css:
To avoid the scrollbar I use this css:
.modal {
overflow: hidden;
}
但我无法避免这种转变.
But I can not avoid the shift.
问候，马可
我使用的是 Bootstrap 版本 3
I am using Bootstrap Version 3
推荐答案
Marko,
我刚刚遇到了同样的问题.当模态首次显示时，Bootstrap 3.0.0 似乎向 、modal-open 添加了一个类.此类将 margin-right: 15px 添加到正文以说明滚动条，它位于较长的页面上.这很好，除了当滚动条不在主体上时较短的页面.在没有滚动条的情况下，margin-right 会导致主体在模态打开时向左移动.
I just had the same problem. It appears that Bootstrap 3.0.0 adds a class to <body>, modal-open, when the modal first shows. This class adds margin-right: 15px to the body to account for a scrollbar, which is there on longer pages. This is great, except for shorter pages when a scrollbar isn't on the body. In the no scrollbar case, the margin-right causes the body to shift left on modal open.
我能够通过添加一些简短的 Javascript 和一些 CSS 来解决这个问题:
I was able to solve this by adding some short Javascript and a little CSS:
CSS:
/* override bootstrap 3 class to remove scrollbar from modal backdrop
when not necessary */
.modal {
overflow-y: auto;
}
/* custom class to override .modal-open */
.modal-noscrollbar {
margin-right: 0 !important;
}
JS:
(function($) {
$(document)
.on( 'hidden.bs.modal', '.modal', function() {
$(document.body).removeClass( 'modal-noscrollbar' );
})
.on( 'show.bs.modal', '.modal', function() {
// Bootstrap adds margin-right: 15px to the body to account for a
// scrollbar, but this causes a "shift" when the document isn't tall
// enough to need a scrollbar; therefore, we disable the margin-right
// when it isn't needed.
if ( $(window).height() >= $(document).height() ) {
$(document.body).addClass( 'modal-noscrollbar' );
}
});
})(window.jQuery);
这些组合允许边距右滚动条修复适用于长页面，但对较短页面禁用(当文档高度 <= 窗口高度时).我希望这会有所帮助！
These combined permit the margin-right scrollbar fix to work for long pages, yet is disabled for shorter pages (when document height <= window height). I hope this helps!
Bootstrap 3.0.1+(测试到 3.1.1)是另一回事.请尝试以下操作:
Bootstrap 3.0.1+ (tested up to 3.1.1) is a different story. Try the following:
CSS:
/* override bootstrap 3 class to remove scrollbar from modal backdrop
when not necessary */
.modal {
overflow-y: auto;
}
/* custom class to add space for scrollbar */
.modal-scrollbar {
margin-right: 15px;
}
JS:
(function($) {
$(document)
.on( 'hidden.bs.modal', '.modal', function() {
$(document.body).removeClass( 'modal-scrollbar' );
})
.on( 'show.bs.modal', '.modal', function() {
// Bootstrap's .modal-open class hides any scrollbar on the body,
// so if there IS a scrollbar on the body at modal open time, then
// add a right margin to take its place.
if ( $(window).height() < $(document).height() ) {
$(document.body).addClass( 'modal-scrollbar' );
}
});
})(window.jQuery);
<小时>
编辑:
鉴于 Mac 消除了占用窗口渲染宽度的滚动条，如果您不介意某些功能检测，这里有一个更便携的解决方案 (3.0.1+).参考:http://davidwalsh.name/detect-scrollbar-width
In light of Mac eliminating scrollbars from inhabiting window render width, here's a more portable solution (3.0.1+) if you don't mind some feature detection. Reference: http://davidwalsh.name/detect-scrollbar-width
CSS:
.scrollbar-measure {
height: 100px;
overflow: scroll;
position: absolute;
top: -9999px;
}
JS:
window.jQuery(function() {
// detect browser scroll bar width
var scrollDiv = $('<div class="scrollbar-measure"></div>')
.appendTo(document.body)[0],
scrollBarWidth = scrollDiv.offsetWidth - scrollDiv.clientWidth;
$(document)
.on('hidden.bs.modal', '.modal', function(evt) {
// use margin-right 0 for IE8
$(document.body).css('margin-right', '');
})
.on('show.bs.modal', '.modal', function() {
// When modal is shown, scrollbar on body disappears. In order not
// to experience a "shifting" effect, replace the scrollbar width
// with a right-margin on the body.
if ($(window).height() < $(document).height()) {
$(document.body).css('margin-right', scrollBarWidth + 'px');
}
});
});
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