Canvas Security Error Dom Exception 18
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Uncaught Error Security_err Dom Exception 18
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Canvas Origin-clean
helping each other. Join them; it only takes a minute: Sign up Why does canvas.toDataURL() throw a security exception? up vote 76 down vote favorite 21 Did I not get enough sleep or what? This following code var canvas.todataurl security error ie frame=document.getElementById("viewer"); frame.width=100; frame.height=100; var ctx=frame.getContext("2d"); var img=new Image(); img.src="http://www.ansearch.com/images/interface/item/small/image.png" img.onload=function() { // draw image ctx.drawImage(img, 0, 0) // Here's where the error happens: window.open(frame.toDataURL("image/png")); } is throwing this error: SECURITY_ERR: DOM Exception 18 There's no way this shouldn't work! Can anyone explain this, please? javascript html5 canvas cross-domain cors share|improve this question edited Mar 27 '14 at 14:57 fab 302314 asked Mar 5 '10 at 22:00 pop850 1,87931932 See here for a solution: How to todataurl alternative use canvas.toDataURL() to get base64 of image in Adobe AIR? –Danny Beckett Jul 9 '13 at 23:21 2 That solution doesn't seem useful to people not using Adobe AIR. –ObscureRobot Aug 16 '13 at 22:53 add a comment| 8 Answers 8 active oldest votes up vote 62 down vote accepted In the specs it says: Whenever the toDataURL() method of a canvas element whose origin-clean flag is set to false is called, the method must raise a SECURITY_ERR exception. If the image is coming from another server I don't think you can use toDataURL() share|improve this answer answered Mar 5 '10 at 22:24 Bob 5,65242744 6 If an attacker is able to guess the name of a picture that you have in a private site, he would be able to get a copy of it by painting in on a canvas and sending the new image to his site. The main restriction from my point of view is to avoid drawing the contents of another site, but security is too complex as the attacker can find a hole in any unexpected site. –AlfonsoML Mar 5 '10 at 23:46 3 Note that the subdomain matters as well. In my experience, in Chrome at least, a SECURITY_ERR: DOM Exception 18 is raised when making a call that is perceived to be across subdomains: 1. in example.com/some/p
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Canvas Cross Origin
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Html Img Crossorigin
it only takes a minute: Sign up “DOM Exception 18” from canvas up vote 5 down vote favorite 1 I'm taking an SVG image, drawing it onto a canvas, and trying to export it via toDataURL, but Chrome is http://stackoverflow.com/questions/2390232/why-does-canvas-todataurl-throw-a-security-exception throwing me that DOM Exception 18 security error. I know the problem is because I drew the SVG image onto the canvas with a data URI scheme (data:image/svg+xml;base64), so I guess the browser sees it as cross-domain (i.e., a security problem), but I can't think of any other way to get my SVG stuff onto the canvas. I can't host it because the SVG contents are dynamic and manipulated first before needing to be exported via toDataURL. I read through http://stackoverflow.com/questions/13829525/dom-exception-18-from-canvas some of the other similar questions asked on here but couldn't find any solutions for my problem. javascript html5 canvas svg share|improve this question asked Dec 11 '12 at 22:24 user1807782 879 add a comment| 2 Answers 2 active oldest votes up vote 3 down vote In Chrome drawing any SVG on to a canvas taints it because the SVG might contain a foreignObject, here is the bug. Chrome also has issues with data URI schemes and canvas, so you're running into a double whammy. share|improve this answer answered Dec 11 '12 at 22:31 robertc 49.7k11135142 add a comment| up vote 0 down vote I have the same problem. As a workaround I used a SVG to HTML5 Canvas Converter to transpile the svg into canvas calls. share|improve this answer answered May 9 '14 at 17:53 tripod 665 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged javascript html5 canvas svg or ask your own question. asked 3 years ago viewed 1353 times active 2 years ago Get the weekly newsletter! In it, you'll get: The week's top q
involves using http://timdietrich.me/blog/dom-exception-18-security-error/ HTML5's "Canvas" feature, and ran into an error that I had never seen before. The error thrown was: SecurityError: http://www.codeproject.com/Questions/280765/Canvas-toDataURL-throws-security-exception DOM Exception 18: An attempt was made to break through the security policy of the user agent. The error dom exception was being thrown at a point in the code where I call the toDataURL() method. It took awhile, but I eventually discovered that the error was being thrown because there were images being drawn on the canvas dom exception 18 which were not in the same domain as the file itself. In my case, I was working on a local HTML file. The "fix" for this is to look at the sources of the images being added to the canvas. Make absolutely sure that they match the domain that the HTML file itself is on - even if you're working on a local file. Please enable JavaScript to view the comments powered by Disqus. comments powered by Disqus Blog Search: I'm presenting at the 2016 Xojo Developer Conference. Learn more. "Tim has a unique and very strong ability to understand real world applications..." Read more testimonials. © 2016 Tim Dietrich.
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