I am trying to use the code from Battlehorse to convert a Google visualization diagram into an image that needs to be saved on the server. I was able to get this to work on localhost, but when I try to use it on a web server, I get the error message "canvg is undefined". IIS 7 is running on the web server. I searched quite a lot and could not find any information about this error. Does anyone know what causes this error or how to solve it?
http://www.battlehorse.net/page/topics/charts/save_google_charts_as_image.html
Code example:
<html>
<head>
<script type="text/javascript" src="http://canvg.googlecode.com/svn/trunk/rgbcolor.js"></script>
<script type="text/javascript" src="http://canvg.googlecode.com/svn/trunk/canvg.js"></script>
<script type="text/javascript">
function getImgData(chartContainer) {
var chartArea = chartContainer.getElementsByTagName('svg')[0].parentNode;
var svg = chartArea.innerHTML;
var doc = chartContainer.ownerDocument;
var canvas = doc.createElement('canvas');
canvas.setAttribute('width', chartArea.offsetWidth);
canvas.setAttribute('height', chartArea.offsetHeight);
canvas.setAttribute(
'style',
'position: absolute; ' +
'top: ' + (-chartArea.offsetHeight * 2) + 'px;' +
'left: ' + (-chartArea.offsetWidth * 2) + 'px;');
doc.body.appendChild(canvas);
canvg(canvas, svg);
var imgData = canvas.toDataURL("image/png");
canvas.parentNode.removeChild(canvas);
return imgData;}
function alert10() {
try {
var textbox1 = document.getElementById('textbox1');
textbox1.value = getImgData(document.getElementById('chart1_div'));
}
catch (err) {
alert(err.message);
}
}
</script>
</head>
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