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function canvasToBlob(canvas) {
var imageBase64 = canvas.toDataURL();
var imageBinaryString = atob(imageBase64.split(',')[1]);
var imageBinary = new Uint8Array(imageBinaryString.length);
for (var i = 0; i < imageBinaryString.length; i++) {
imageBinary[i] = imageBinaryString.charCodeAt(i);
return new Blob([new Uint8Array(imageBinary)], {type: 'image/png'});
function canvasToLocalFile(canvas, filename) {
var link = document.createElement("a");
link.href = canvas.toDataURL(); = filename;;
function canvasToFacebook(canvas) {
FB.login(function(response) {
var accessToken = response.authResponse.accessToken;
var fd = new FormData();
fd.append("source", canvasToBlob(canvas));
fd.append("access_token", accessToken);
fd.append("message", "This is my university timetable, generated on");
url:"" + accessToken,
type: "POST",
data: fd,
processData: false,
contentType: false,
cache: false
}, {scope: 'user_photos,publish_actions,publish_stream'});
function htmlToFacebook(node) {
html2canvas(node, {
onrendered: function(canvas) {
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