Using html2Canvas to capture SVG image

Question

I'm using html2Canvas library and trying to make a screenshot of a SVG with this code:

var svgElements= $container.find('svg');
svgElements.each(function (){
    var canvas, xml;

    canvas = document.createElement("canvas");
    canvas.className = "screenShotTempCanvas";
    //convert SVG into a XML string
    xml = (new XMLSerializer()).serializeToString(this);
    xml = xml.replace(/xmlns=\"http:\/\/www\.w3\.org\/2000\/svg\"/, '');
    canvg(canvas, xml);
    $(canvas).insertAfter(this); 

    this.className"tempHide";
    $(this).hide();
}); 
$container.find('.screenShotTempCanvas').remove(); 
$container.find('.tempHide').show().removeClass('tempHide');

but my problem is that I have a input (foreignObject) inside the svg. The screenshot that it takes, contains only the svg elements. Anyone has a solution for this? How I can I capture all the elements on page?

Thank!