I'm currently working with SVG. I need to know the string length in pixels in order to do some alignment. How can I do to get the length of a string in pixel ?

Update: Thanks to nrabinowitz. Based on his help, I can now get the length of dynamic-added text. Here is an example:

<svg id=main 

    xmlns=http://www.w3.org/2000/svg 

    xmlns:xlink=http://www.w3.org/1999/xlink

    version=1.1 

    width=1020

    height=620 

    viewBox=0 0 1020 620

    onload=startup(evt)>



<script>

    <![CDATA[

        var startup = function (evt) {

            var width;

            var svgNS = http://www.w3.org/2000/svg;

            var txtNode = document.createTextNode(Hello);

            text = document.createElementNS(svgNS,text);



            text.setAttributeNS(null,x,100);

            text.setAttributeNS(null,y,100);

            text.setAttributeNS(null,fill,black);

            text.appendChild(txtNode);                                              

            width = text.getComputedTextLength();               

            alert( Width before appendChild: +  width);                       

            document.getElementById(main).appendChild(text);

            width = text.getComputedTextLength();

            alert( Width after appendChild: +  width)

            document.getElementById(main).removeChild(text);              

        }       

    //]]>

</script>

</svg>