固定位置div在pos：relative&溢出-Y：滚动 [英] Fixed position div inside pos:relative & overflow-y:scroll

问题描述

我想在div中使用overflow-y：scroll定位div，这意味着我希望div保持原位，其余内容正常滚动。
我无法弄清楚有什么不对，谁能帮忙？在此先感谢...

  .foo {
 position：relative; 
 display：block; 
宽度：100％; 
 height：300px; 
 overflow-y：scroll; 
} 
 .bar {
 position：fixed; 
 top：0; 
 right：0; 
} 
  

这里是HTML

 < div class =foo> 
< div class =bar>< div><！ - 应该固定的div末尾 - > 
< div class =someOther> ...< / div> 
< div class =someOther> ...< / div> 
< div class =someOther> ...< / div> 
< div class =someOther> ...< / div> 
< / div><！ - 容器结束 - > 
  

解决方案

固定到一个元素，您将它定位在与窗口本身相关的位置，而不是它的父元素。只要父母的位置不是位置，您就需要使用 position：absolute 来定位子女相对于其父母的位置：静态，默认位置。

正如你在你的例子中所做的那样，将 position：relative 应用于父节点。 foo ，然后将位置：绝对应用到子元素 .bar 。通常情况下，这会实现将 .bar 贴到父项顶部的预期结果，但是由于在父div中有子项内容的溢出，并且 overflow-y：scroll 滚动全部子内容 .bar 也必须滚动。请参阅我的小提琴的顶部示例。

解决这个问题，使用 overflow-y：scroll 打开要滚动到另一个容器的内容并移除 overflow-y：scroll on .foo 以防止 .bar 滚动。

<要查看您可以适应的工作示例，请参阅我的小提琴的底部示例。

I want to have a div with fixed position inside a div with overflow-y:scroll, meaning I want the div to stay in place while the rest of the content scrolls normally. And I can't figure out what is wrong, could anyone help? thanks in advance...

.foo {
    position:relative;
    display:block;
    width:100%;
    height:300px;
    overflow-y:scroll;
}
.bar {
    position:fixed;
    top:0;
    right:0;
}

And here is the HTML

<div class="foo">
    <div class="bar"><div><!-- end of div that should be fixed -->
    <div class="someOther">...</div>
    <div class="someOther">...</div>
    <div class="someOther">...</div>
    <div class="someOther">...</div>
</div><!-- end of container -->

解决方案

When you apply position:fixed to an element, you are positioning it in relation to the window itself, not its parent element. You'll want to use position:absolute to position a child in relation to its parent, as long as the parent has a position other than position:static, the default position.

As you correctly did in your example, apply position:relative to the parent .foo and then apply position:absolute to the child .bar. Normally, this would achieve the desired result of snapping the .bar to the top of the parent, but since there is an overflow of child content in the parent div, and overflow-y:scroll scrolls all the child content, .bar has to scroll as well. See the top example in my Fiddle here.

To fix that, wrap the content you want to scroll in another container with overflow-y:scroll on and remove overflow-y:scroll on .foo to prevent .bar from scrolling.

To see the working example that you can adapt, see the bottom example in my Fiddle here.

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