I try to download a png file.

When there is a image on canvas, I add an image to canvas and call toDataURL it shows me a blank page, and data url is also blank.

downloadCanvasAsPng (elementId, link, smiles, itemName) I let canvas; canvas document.getElementById(elementId); //link.href canvas.toDataURL); //link. download = smiles +-+ itemName + .png"; link = document.createElement('a'); const fileName = smiles +-' + itemName + '.png"; link.download fileName; const fileUrl-canvas . toDataURL(); link.href - fileUrl; link.target"_self'; link.click()