Save canvas as an image in chome and firefox is easy, the code below will work.
....
function saveAsImage(ele){
var c=document.getElementById("myCanvas");
var image = c.toDataURL().replace("image/png", "image/octet-stream");
ele.download = 'image.png';
ele.href = image;
}
....
<body>
...
<a href="javascript:void(0)" onclick="saveAsImage(ele)">downloadCanvas</a>
...
<body>
But, in IE(obsolutely in IE>=9), the code does not work, after some investigation in MSDN, I found a work around:
function saveAsPng(ele){
window.BlobBuilder = window.BlobBuilder || window.MSBlobBuilder ||
window.WebKitBlobBuilder || window.MozBlobBuilder;
var toBlob = c.toBlob || c.msToBlob;
var saveBlob = window.navigator.saveBlob || window.navigator.msSaveBlob;
if(window.BlobBuilder && toBlob && saveBlob){
var blobBuilder = new window.BlobBuilder();
blobBuilder.append(toBlob.bind(c)());
saveBlob.bind(window.navigator)(blobBuilder.getBlob(), "image.png");
}else{
var image = c.toDataURL().replace("image/png", "image/octet-stream");
ele.download = 'image.png';
ele.href = image;
}
}
The “BlobBuilder”, “toBlob” and “saveBlob” methods can use in MS browser, so we use these methods to recognize MS browser.