how to check if a file is selected using javascript?

Question

In php this is how you would check if a file is selected:

$_FILES[\'item\'][\'size\']>0

what about in JavaScript?

I need to know

Answer 1

http://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-49531485 says:

value of type DOMString
When the type attribute of the element has the value "text", "file" or "password", this represents the current contents of the corresponding form control, in an interactive user agent.

  
    
  
  
    

      

        
      
    
    click