放置< div>在< canvas> [英] Placing a <div> within a <canvas>

问题描述

我在画布元素中加入 div ，如下所示：

I take a div within a canvas element like following:

<canvas>
    <div></div>
</canvas>

这两者都有高度和宽度。但是在这里我看不到 div ！

Here both of them has height and width. But here I can't see the div!

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推荐答案

你不能将元素放在画布中（同时显示）;

You cannot place elements inside a canvas (and have both displayed); they are only displayed if the browser does not understand the canvas element.

如果你想把元素放在同一个区域作为一个画布，这里是一个技巧很多），它会让你这样做：

If you would like to position elements over the same area as a canvas, here is one technique (among many) that would let you do it:

HTML

<div id="canvas-wrap">
  <canvas width="800" height="600"></canvas>
  <div id="overlay"></div>
</div>

CSS

#canvas-wrap { position:relative } /* Make this a positioned parent */
#overlay     { position:absolute; top:20px; left:30px; }

这是另一种技术，它允许div的内容正常流动，内容：

Here's another technique, which lets the content of the div flow normally and makes the canvas a background to the content:

CSS

#canvas-wrap { position:relative; width:800px; height:600px }
#canvas-wrap canvas { position:absolute; top:0; left:0; z-index:0 }

这篇关于放置< div>在< canvas>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！