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POHow to avoid clearing canvas element on changing it's container's innerHtml
 

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  1. POHow to avoid clearing canvas element on changing it's container's innerHtml
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    <p>I am using javascript to draw to a canvas element inside a div, contained within a wrapper. The canvas and its div are generated dynamically by adding to the wrapper's innerHTML. The goal is to allow an infinite number of canvases to be generated</p> <pre><code>&lt;div id="wrapper"&gt; &lt;div id="container"&gt;&lt;canvas id="previous"&gt;&lt;/canvas&gt;&lt;/div&gt; &lt;!-- infinite # of container divs &amp; canvases --&gt; &lt;/div&gt; </code></pre> <p>However, when I add a new div and canvas to the wrapper's innerHTML anything drawn to the previous canvas is lost.</p> <p>Where if I add a new canvas elsewhere on the page, to a div outside of the container, or a child of the container: </p> <pre><code>&lt;div id="wrapper"&gt; &lt;div id="container"&gt;&lt;canvas id="previous"&gt;&lt;/canvas&gt;&lt;/div&gt; &lt;/div&gt; &lt;div id="wrapper2"&gt; &lt;!-- newly inserted canvas: --&gt; &lt;div id="container"&gt;&lt;canvas&gt;&lt;/canvas&gt;&lt;/div&gt; &lt;/div&gt; </code></pre> <p>or: </p> <pre><code>&lt;div id="wrapper"&gt; &lt;div id="container"&gt;&lt;canvas id="previous"&gt;&lt;/canvas&gt;&lt;/div&gt; &lt;div id="wrapperChild"&gt; &lt;!-- newly inserted canvas: --&gt; &lt;div id="container"&gt;&lt;canvas&gt;&lt;/canvas&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>Then the previous canvas is preserved.</p> <p>From what I can tell changing the innerHTML of the wrapper or it's parents results in clearing the canvas. Any advice on how I can avoid clearing the canvas? Can I preserve what's been drawn to the canvas elsewhere and restore it? </p>
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    1. CODoes using DOM instead of `innerHTML` clear the canvases? I mean, you could draw the current canvas to a temporary canvas and then draw it back, but that's hardly feasible with a number of canvases. `innerHTML` requires a restructuring of the current nodes, which might be the reason for clearing of the canvases. If you can, use DOM and avoid `innerHTML`.
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    2. COAnother possible approach is insertAdjacentHtml
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      1. USMatt Greer
 

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