我正在尝试使用Battlehorse的代码将Google Visualization图表转换为图片并保存到服务器上。我能够在本地主机上使其工作,但是当我尝试在Web服务器上使用时,出现错误“canvg未定义”。Web服务器运行的是IIS 7。我已经搜索了很多资料,但没有找到有关此错误的任何信息。是否有人知道是什么原因导致了这个错误,或者如何解决它?
http://www.battlehorse.net/page/topics/charts/save_google_charts_as_image.html
代码示例:
<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>