我有一个最大宽度的布局,当屏幕宽度大于最大值时,它是水平居中的.布局包括一个固定的标题&菜单;当屏幕宽度小于最大值时,菜单的左侧位置为0,并且当屏幕宽度超过最大值时,菜单的左侧位置需要与布局的其余部分的左边缘齐平.
这是它应该如何看：
*{Box-sizing:border-Box;margin:0;padding:0;}
header{
align-items:center;
background:#eee;
border-bottom:1px solid #999;
display:flex;
height:100px;
left:0;
justify-content:center;
padding:0 10px;
position:fixed;
right:0;
top:0;
}
h1{
height:60px;
position:relative;
width:calc(100% - 40px);
max-width:740px;
z-index:2;
}
img{
height:100%;
width:auto;
}
nav{
background:#eee;
border-right:1px solid #999;
bottom:0;
left:0;
position:fixed;
top:0;
width:300px;
z-index:1;
}
@media (min-width:801px){
nav{
border-left:1px solid #999;
left:calc((100% - 800px) / 2)
}
}
nav::before{background:#ecc;bottom:0;content:"";left:0;position:absolute;top:0;width:10px;}
nav::after{background:#999;content:"";height:1px;left:0;position:absolute;right:0;top:99px;}
main{background:#ddf;border-left:1px solid #99c;border-right:1px solid #99c;height:100vh;min-height:100%;margin:0 auto;width:100%;max-width:800px;}
<header>
<h1><img src="http://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-logo.png?v=9c558ec15d8a"></h1>
<nav></nav>
</header>
<main></main>
然而,当引入垂直滚动条时,由于滚动条宽度被包括在媒体查询中被检查的宽度的事实而产生问题,导致当屏幕宽度在800像素和800像素之间时菜单的负左位置800-xpx(其中x是滚动条的宽度).您可以在下面的代码片段中看到这一点(您可能需要通过将浏览器的大小调整到小于800像素)来查看全屏幕 – 菜单的右边界可以靠近标志和红色边缘菜单被裁剪.
*{Box-sizing:border-Box;margin:0;padding:0;}
html,body{height:101%;}
header{
align-items:center;
background:#eee;
border-bottom:1px solid #999;
display:flex;
height:100px;
left:0;
justify-content:center;
padding:0 10px;
position:fixed;
right:0;
top:0;
}
h1{
height:60px;
position:relative;
width:calc(100% - 40px);
max-width:740px;
z-index:2;
}
img{
height:100%;
width:auto;
}
nav{
background:#eee;
border-right:1px solid #999;
bottom:0;
left:0;
position:fixed;
top:0;
width:300px;
z-index:1;
}
@media (min-width:801px){
nav{
border-left:1px solid #999;
left:calc((100% - 800px) / 2)
}
}
nav::before{background:#ecc;bottom:0;content:"";left:0;position:absolute;top:0;width:10px;}
nav::after{background:#999;content:"";height:1px;left:0;position:absolute;right:0;top:99px;}
main{background:#ddf;border-left:1px solid #99c;border-right:1px solid #99c;height:100vh;min-height:100%;margin:0 auto;width:100%;max-width:800px;}
<header>
<h1><img src="http://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-logo.png?v=9c558ec15d8a"></h1>
<nav></nav>
</header>
<main></main>
我明白发生了什么,为什么会发生,但我的问题是：有什么办法,单独使用CSS来防止它发生吗？我尝试使用视口单位,而不是百分比,但反过来会产生问题;在某些屏幕宽度上,标志会向左移动一点,远离菜单的右边框.如果所有浏览器具有相同的滚动条宽度或允许自定义滚动条的样式,这将很容易解决这个问题,但不幸的是,也不是这样.
08/09/16：我现在接受了我自己的答案,因为它是我可以想出来的最好的JavaScript解决方案,但我仍然在寻找一个CSS解决方案.
解决方法
编辑
/* Alexander Gomez's getScrollBarWidth shorten version Josh Bambrick from:
https://stackoverflow.com/questions/986937/how-can-i-get-the-browsers-scrollbar-sizes
*/
function getScrollBarWidth() {
var $outer = $('<div>').css({
visibility: 'hidden',width: 100,overflow: 'scroll'
}).appendTo('body'),widthWithScroll = $('<div>').css({
width: '100%'
}).appendTo($outer).outerWidth();
$outer.remove();
return 100 - widthWithScroll;
};
/* Tested on Chrome 51.0.2704,Firefox 40.0.2,Internet Explorer 11 */
$(document).ready(function() {
var mydelta = 800; /* your 'main' divs width */
var delta_mq = mydelta + 1;
delta = mydelta - getScrollBarWidth();
var h1_logo = delta - 40;
var $appended = '<style>h1{max-width:' + h1_logo + 'px} main{max-width:' + mydelta + 'px} @media (min-width:' + delta_mq + 'px){main{left:calc((100% - ' + delta + 'px) / 2);} nav{border-left:1px solid #999;left:calc((100% - ' + delta + 'px) / 2); } }';
$('body').append($appended);
});
* {
Box-sizing: border-Box;
margin: 0;
padding: 0
}
/*
'*' selector is depreciated cause it's slow
use normalize.css instead
And i removed your css media and appended them to the
page using jquery after getting scrollbar width
*/
header {
align-items: center;
background: #eee;
border-bottom: 1px solid #999;
display: flex;
height: 100px;
left: 0;
justify-content: center;
padding: 0 10px;
position: fixed;
right: 0;
top: 0;
}
h1 {
height: 60px;
position: relative;
width: calc(100% - 40px);
max-width: 750px;
z-index: 2;
}
img {
height: 100%;
width: auto;
}
nav {
background: #eee;
border-right: 1px solid #999;
bottom: 0;
left: 0;
position: fixed;
top: 0;
width: 300px;
z-index: 1;
}
main { /* position with 100px top margin */
position: absolute;
top: 100px;
}
header { /* chrome fix */
z-index: 1;
}
nav::before{background:#ecc;bottom:0;content:"";left:0;position:absolute;top:0;width:10px;}
nav::after{background:#999;content:"";height:1px;left:0;position:absolute;right:0;top:99px;}
main{background:#ddf;border-left:1px solid #99c;border-right:1px solid #99c;height:100vh;min-height:100%;margin:0 auto;width:100%;max-width:800px;}
<header> <h1 class=logo> <img src="http://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-logo.png?v=9c558ec15d8a"> </h1> <nav></nav> </header> <main></main>
