问题
I am using <p:fileUpload> component. Is it possible to preselect and show the selected file in field before the browse button?
I am using Mojarra 2.0.3, PrimeFaces 2.2 RC2, GlassFish 3.
回答1:
No, if this was possible, this would have been a huge security hole. You would then in theory be able to let the selected file point to C:/path/to/passwords.txt and then use JavaScript to submit the form and so silently get a file with sensitive data from the client without its permission.
See also:
- How to set a value to a file input in HTML?
- Send full client side file path to server side using p:fileUpload
来源：https://stackoverflow.com/questions/5847385/how-to-preset-the-value-of-pfileupload