HTML uses form to send data to web server. The data can be included in the url parameters or embedded in HTML Request body. But for a file, I don’t know how it works. I want to know this because I see some difference between uploading file on web and desktop applications.
The desktop application usually provides a text box to allow the user input the locale path of the file. But for web applications, the text box is usually read only.It displays the file path when the file gets selected with the browse button. Is that just a design issue between desktop and web?
Question is a bit unclear, but one important aspect about web applications (or HTML forms) is that they are sandboxed and cannot access local files directly. So the file upload picker does not allow direct input of the file name (which might be scripted), but only selection through an OS (or browser) supplied file choose UI (that the app or page cannot mess with).
Once the user has selected the file the page can access it, but it cannot make the selection itself (or surreptitiously).
A recent trend is to lock down desktop apps in the same manner. See for example Apple’s sandboxing restrictions, that also do not allow apps to open random files without user intervention.