How can I get the base64 string of an image using JS

I'm trying to get the base64 string of an image using only javascript.

This has 开发者_如何学编程to work only on firefox 3.5+ since it's a greasemonkey script.

I can't use the canvas workaround since it's on a another server and this throws a security exception.

Thanks for any idea.

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Maybe there's a more elegant solution but you can create a canvas with the dimensions of your image, use drawImage to put your image on the canvas, use toDataURL with the MIME type that you want and get a data: URL which will be something like "data:image/png;base64," and then the base64 representation of the image in a given format.

Oh, I've just read that it's on another server. Then you can't have the base64. Sorry. The only information you can get are the dimensions.

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base64.js is what you are looking for