html5 - Handling canvas.drawImage errors when image.src is unavailable -

what efficient , proper way handle calling drawimage on canvas context when image's src url unavailable. example:

myimage.src = "imagedoesnotexist"; canvasctx.drawimage(myimage,0,0); // 0x80004005 - javascript runtime error: unspecified error. 

thanks!

in addition image.onload there image.onerror these occasions

var img = new image(); img.onload = function(){      context.drawimage(img,0,0); };  img.onerror = function(){      alert("oops, bad stuff happened while loading image."); }; img.src = "imagedoesnotexist";