As far as I can tell, it is impossible to access the content of files on the user’s computer in a web application without first uploading to the server, then re-downloading to user, unless some sort of plug-in is used. (Flash, etc.) Ideally, the user would upload the file directly to localstorage and then scripts would have a chance to process/display/validate/filter without the user having to wait on an upload.
Are there any features in upcoming web standards such as html5 that will allow this? If not, why has there been no effort to make this possible, and how can I work around it without getting stuck with plugins?
EDIT: DO NOT assume that I want to let JavaScript access arbitrary files on the hard drive without any user intervention. We already have the ability to prompt the user for a file and upload it, I only want the ability to prompt the user for a file to be loaded into the browser’s memory. I was only hoping HTML5 would have support for something you can already do with both Flash and Java applets.
Doesn’t the File API ( http://www.w3.org/TR/FileAPI/ ) do that ?
It’s implemented in Firefox 3.6 (see https://developer.mozilla.org/en/DOM/FileReader and https://developer.mozilla.org/en/Using_files_from_web_applications )
According to http://code.google.com/events/io/2010/sessions/html5-status-chrome.html it is supported in chrome.