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I'm trying to save a canvas with images to PNG, but when I try this:

var myCanvas = document.getElementById("myCanvas"); var img = document.createElement('img'); var ctx = myCanvas.getContext ? myCanvas.getContext('2d') : null; img.src = 'image.png'; img.onload = function () { ctx.drawImage(img, 0, 0, myCanvas.width, myCanvas.height); } var data = myCanvas.toDataURL("image/png"); if (!window.open(data)) { document.location.href = data; }

I only get a blank transparent image without the image. What am I doing wrong?

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1 Answer 1

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6

You need to put the window.open call in the load handler since this happens asynchronously.

img.onload = function () { ctx.drawImage(img, 0, 0, myCanvas.width, myCanvas.height); var data = myCanvas.toDataURL("image/png"); if (!window.open(data)) { document.location.href = data; } }
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