How do I get element identifiers for a webpage's file upload dialog?

Hi, I would like to know some identifying attributes of a webpage’s file upload dialog. Specifically I would like to know how to identify the filename textfield, the open button, and the cancel button. I can do this with either xpath and selenium or javascript(getElementById, getElementByName, etc.). I usually use firebug but clicking the button that enables me to highlight the desired element on the page in order to obtain the xpath does not work on the file upload dialog. How can I find out either the name, value, class, id, or any other identifying attribute for the file upload dialog’s filename textfield, open button, or cancel button? Thanks.

I don’t think that that’s possible. What are you wanting to achieve?

Thanks for responding. I am trying to automate uploading a file. I think it may be possible from ; unfortunately the id they specified, ‘fileName’, doesn’t work on my website. I am trying to find out how I can find the value of this id, or of a name, or of a value, etc. because I haven’t been able to with either Firebug or Xpath checker.

They are affecting the file input field. You don’t have the control to affect anything in regards to the dialog itself.