相对于图像定位块 [英] Positioning blocks relative to an image

问题描述

我有以下情况：

• 我有一个固定大小的容器。


• 容器内部显示比容器大的图像（尺寸未知）。我想显示尽可能大的图像（但保持宽高比）。我还希望图像在容器中垂直和水平居中（迄今为止非常好，我知道该怎么做）


• 现在我想要有两个叠加层（未知大小）图像：一个与顶部对齐，另一个与图像底部对齐。
  

我无法获得最后一点。如果不清楚，那么希望这个演示应该有所帮助：在那里，我将覆盖图与顶部/底部的容器。相反，我希望它们与图像对齐。

解决方案

position：relative 不适用于表格细胞。

从规格： http://www.w3.org/TR/CSS21/visuren.html#propdef-position

在表行集合上的'position：relative'的作用，
table-header-group，table-footer-group，table-row，table-column-group，
table-column， table-cell和table-caption元素是未定义的。

因此，添加一个包装 div 并将位置：相对应用于此：

http://jsfiddle.net/B9Le8/5/

 < div id =container> 
< div> <！ - 包装 - > 
< img id =imgsrc =http://lh5.ggpht.com/-J7Q7cUDEFOU/S_bKEoyMSzI/AAAAAAAAGIw/PZJduitsVa0/largeNewGoogleLogoFinalFlat-a.png/> 
< div class =overlayid =top> Overlay top< / div> 
< div class =overlayid =bottom>覆盖底部< / div> 
< / div> 
< / div> 
 
 #container> div {
 position：relative; 
} 
  

I have the following situation:

• I have a container of a fixed size.
• Inside the container I display an image (of unknown size) that is bigger than the container. I want to display the image as big as possible (but keeping the aspect ratio). I also want the image to be vertically and horizontally centered in the container (so far so good, I know how do that)
• Now I want to have two overlays (of unknown size) over the image: one aligned with the top and one with the bottom of the image.

I cannot get the last point right. If it's unclear then hopefully this demo should help: there I have the overlays aligned with top/bottom of the container. Instead I want them aligned with the image. Any help appreciated!

解决方案

position: relative does not work on table cells.

From the spec: http://www.w3.org/TR/CSS21/visuren.html#propdef-position

The effect of 'position:relative' on table-row-group, table-header-group, table-footer-group, table-row, table-column-group, table-column, table-cell, and table-caption elements is undefined.

So, add a wrapper div and apply position: relative to that instead:

http://jsfiddle.net/B9Le8/5/

<div id="container">
    <div> <!-- the wrapper -->
        <img id="img" src="http://lh5.ggpht.com/-J7Q7cUDEFOU/S_bKEoyMSzI/AAAAAAAAGIw/PZJduitsVa0/largeNewGoogleLogoFinalFlat-a.png" />
        <div class="overlay" id="top">Overlay top</div>
        <div class="overlay" id="bottom">Overlay bottom</div>
    </div>
</div>

#container > div {
    position: relative;
}

这篇关于相对于图像定位块的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！