HTML5 Web Workers work in Firefox 4, but not in Chrome 12.0.742.122

Question

When I tried to play around with Web Workers feature in HTML5, my firefox works happily but chrome complains that:

Uncaught TypeError: Cannot call met

Answer 1

I'm guessing you're trying to run this on your local machine, not on a webserver. Workers are restricted by the Same Origin Policy, but as the linked Wikipedia page notes,

The behavior of same-origin checks and related mechanisms is not well-defined in a number of corner cases, such as for protocols that do not have a clearly defined host name or port associated with their URLs (file:, data:, etc.).

Loading a local file, even with a relative URL, is the same as loading a file with the file: protocol. So my guess is that the problem is that you're trying to load worker.js as a local file - Chrome doesn't like this (for some good security reasons), though you can force the issue by starting Chrome like this: chrome.exe --allow-file-access-from-files

Alternatively, try serving your script on a local or remote webserver and see if that fixes the problem. (If you have Python installed, you can go to the directory in question and run python -m SimpleHTTPServer 8000, then go to http://localhost:8000/ in your browser).