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POFirefox -- Dynamically embedding <svg> element in SVG
 

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  1. POFirefox -- Dynamically embedding <svg> element in SVG
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    <p>I am trying dynamically to append an <code>&lt;svg&gt;</code> element to an existing SVG island on an XHTML page (Firefox 3.6.3). And it is crashing the browser.</p> <p>Done manually, this works as expected:</p> <pre><code>&lt;svg xmlns="http://www.w3.org/2000/svg"&gt; &lt;svg xmlns="http://www.w3.org/2000/svg"&gt; ... &lt;/svg&gt; &lt;/svg&gt; </code></pre> <p>However, if you dynamically add this element using JavaScript, the browser crashes. Simple example:</p> <pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head&gt; &lt;title&gt;SVG island example&lt;/title&gt; &lt;script type="text/javascript"&gt;&lt;![CDATA[ function crash( ) { svgs = document.getElementsByTagNameNS( "http://www.w3.org/2000/svg", "svg" ); for ( var i = 0; i &lt; svgs.length; i++ ) { var e = document.createElementNS( "http://www.w3.org/2000/svg", "svg" ); svgs[i].appendChild( e ); } } ]]&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;svg id="mySVG" xmlns="http://www.w3.org/2000/svg"&gt; &lt;/svg&gt; &lt;button onclick="crash()"&gt;Crash Firefox&lt;/button&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Interestingly, if I do a <code>getElementById</code>, it works <em>fine</em>. Interesting, but not particularly helpful in my situation since I'm storing pointers to <code>SVGDocument</code>s. Example:</p> <pre><code>function doesntCrash( ) { var svg = document.getElementById( "mySVG" ); var e = document.createElementNS( "http://www.w3.org/2000/svg", "svg" ); svg.appendChild( e ); } </code></pre> <p><strike>As far as I can tell, this is a Firefox bug.</strike> Does anyone have any insight into this matter?</p> <p><strong>UPDATED (solution):</strong> As stated below, the issue was the "liveness" of the <code>HTMLCollection</code> returned by the <code>getElementsByTagNameNS</code> call which I mistook for a native array (<em>tsk, tsk!</em>) A quick hackaround would be to either store the array length in a variable, if you're only appending. A better solution might be to copy the array contents to a native array, as described <a href="https://stackoverflow.com/questions/222841/most-efficient-way-to-convert-an-htmlcollection-to-an-array">here</a>. Here's an updated using that method:</p> <pre><code>function doesntCrash( ) { var svgs = document.getElementsByTagNameNS( "http://www.w3.org/2000/svg", "svg" ); // copy contents to native a static, array svgs = Array.prototype.slice.call( svgs ); for ( var i = 0; i &lt; svgs.length; i++ ) { var e = document.createElementNS( "http://www.w3.org/2000/svg", "svg" ); svgs[i].appendChild( e ); } } </code></pre> <p>Thank you Sergey Ilinsky for your quick response!</p>
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