使用全宽排除溢出滚动条,其中“position:absolute” [英] Use full width excluding overflow scrollbar with "position: absolute"
问题描述
我想在一个固定的顶部位置有一个小的红色div,在另一个有 overflow:scroll
的div。我希望jsFiddle清楚地表明: http://jsfiddle.net/mCYLm/2/ 。
I would like to have a small red div with full width at a fixed top position, inside another div that has overflow: scroll
. I hope the jsFiddle makes it clear: http://jsfiddle.net/mCYLm/2/.
问题是红色div与滚动条重叠。我想 right:0
表示 div.wrapper
的右边;它不会减去 div.main
的滚动条。当我将 overflow:scroll
移动到 div.wrapper
时,红色横幅具有正确的大小=http://jsfiddle.net/mCYLm/3/>小提示)。
The issue is that the red div is overlapping the scrollbar. I guess right: 0
means the right hand side of div.wrapper
; it does not subtract the scrollbar of div.main
. When I move the overflow: scroll
into div.wrapper
, then the red banner has the right size (fiddle). However, it is not at a fixed position anymore (scrolling down makes the banner scroll up).
如何一起实现以下两件事?
How can I achieve the following two things together?
- The red banner is at the fixed position like in this fiddle.
- The red banner has full width except the scrollbar like in this fiddle.
我想在Google Chrome中使用此工具。
I'd like to get this working in Google Chrome.
HTML:
<div class="wrapper">
<div class="red-banner"></div>
<div class="main">
<div class="item">foo</div>
<div class="item">foo</div>
<div class="item">foo</div>
<div class="item">foo</div>
</div>
</div>
CSS:
div.wrapper {
position: relative;
}
div.main {
height: 200px;
overflow-y: scroll;
}
div.item {
border: 1px solid black;
margin: 20px;
padding: 20px;
}
div.red-banner {
background-color: red;
position: absolute;
left: 0;
top: 0;
right: 0;
height: 20px;
}
推荐答案
看起来不是可能是纯CSS,所以这里有一个JavaScript(jQuery)hack:
Seems like this isn't possible with pure CSS, so here's a JavaScript (jQuery) hack:
$(function() {
var $container = $("<div>").css({ height: 1, overflow: "scroll" }).appendTo("body");
var $child = $("<div>").css({ height: 2 }).appendTo($container);
window.SCROLLBAR_WIDTH = $container.width() - $child.width();
$container.remove();
});
然后:
$("div.red-banner").css({
right: SCROLLBAR_WIDTH
});
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