jQuery addClass example
Change class name on click in jQuery
HTML
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="838px" height="721px" version="1.1"><g transform="translate(0.5,0.5)"><rect x="239" y="0" width="320" height="80" fill="#fff2cc" stroke="#000000" pointer-events="none"/><rect x="239" y="120" width="320" height="80" fill="#a9c4eb" stroke="#000000" pointer-events="none"/><rect x="239" y="240" width="320" height="80" fill="#f8cecc" stroke="#000000" pointer-events="none"/><rect x="659" y="280" width="120" height="320" fill="#fff2cc" stroke="#000000" transform="rotate(-23,719,440)" pointer-events="none"/><rect x="49" y="290" width="120" height="320" fill="#99ffff" stroke="#000000" transform="rotate(19,109,450)" pointer-events="none"/><rect x="169" y="480" width="230" height="80" fill="#a9c4eb" stroke="#000000" pointer-events="none"/><rect x="424" y="480" width="230" height="80" fill="#a9c4eb" stroke="#000000" pointer-events="none"/><rect x="79" y="680" width="680" height="40" fill="#cc0066" stroke="#000000" pointer-events="none"/></g></svg>
JavaScript
// Code from http://stackoverflow.com/questions/10717190/convert-svg-polygon-to-path
var polys = document.querySelectorAll('rect');
[].forEach.call(polys,convertPolyToPath);
function convertPolyToPath(poly){
var svgNS = poly.ownerSVGElement.namespaceURI;
var path = document.createElementNS(svgNS,'path');
var x = poly.getAttribute('x');
var y = poly.getAttribute('y');
var w = poly.getAttribute('width');
var h = poly.getAttribute('height');
var _x = (x+y) * -1;
var pathdata = 'M'+x+' '+y+' h '+w+ ' v '+h+' h'+ _x +' Z';
path.setAttribute('d',pathdata);
path.setAttribute('fill','transparent');
path.setAttribute('stroke','black');
console.log(path);
}