Canvas toDataURL() giving blank image
I'm a complete beginner to JS and I'm just playing around with HTML5.
While experimenting, I came across this issue. I have something like this:
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script type="text/javascript">
function graph() {
// ...stuff that draws to canvas, verified "working"...
var downloadLink =
document.getElementById("myCanvas").toDataURL();
$("#dlLink").attr("href", downloadLink);
}
$(window).load(function() {
graph();
});
</script>
</head>
<body>
<div class="container">
<h1 style = ";padding-bottom:30px;"><a href="#">Tool</a></h1>
<canvas id="myCanvas" width="400" height="400"></canvas>
<a href="#" id="dlLink">Download</a>
</div>
</body>
</html>
When I click the download link with the base64 encoding, I get a blank
image. Can anyone bring to light why this is happening? It seems like the
link is generated before the canvas has anything on it, but I can't be
sure.
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