Always remember that users are in control: it’s their device and connection. Your script can also be modified or have specific facilities disabled. Browsers ‘pull’ files from your server the user can stop that occurring via browser settings, proxy methods, plug-ins or a range of other interception options. It is impossible for site owners or developers to force users to download and run JavaScript. converter.Can You Prevent Users Disabling JavaScript? also call foStream.writeData directlyġ3. if you are sure there will never ever be any non-ascii text in data you canġ2. In a c file operation, we have no need to set file mode with or operation,ġ1. use 0x02 | 0x10 to open file for appending.Ħ. Then, write to a file using an XPCOM object (example code from Mozilla Developer Network): 1. Request permission to use XPCOM (this will prompt the user for confirmation, no way to avoid it): ("UniversalXPConnect") You are asking a user to grant full access to their computer (read, write, execute) with the identity of the user running Firefox. Requesting XPCOM privileges on a website is a bad practice! It's basicly equivalent to running an. This is not standard JavaScript and I would not recommend this approach unless you are developing a very specific application, that will be used in a very specific way (like for example, a client-side JavaScript-HTML only wiki). There is a way for unprivileged (web page) JavaScript to request more privileges and if the user grants it (there will be a pop up dialog asking for permission), the web page code would be able to write to a file. This is not allowed for JavaScript loaded from a web page, and it is intended to be used by JavaScript running inside a Firefox add-on (with high level of privileges). You can write files in JavaScript in Firefox, but you have to use an XPCOM object (internal browser API).
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