not able to get uploaded file size in javascript

[kavita vala]

I want to know the client document size before it uploaded to browser
I have a code given below.
Javascript function

 function getfilesize()
               {
                   alert('hi size check')
                  var oas = new ActiveXObject("Scripting.FileSystemObject");
                  alert('1')
                  var d = document.form.b.value;
                  alert('2')
                  var e = oas.getFile(d);
                  alert('3')
                  var f = e.size;
                  alert(f + " bytes");
              }   

and html code is

  
<div>
<input type="file" name="b">
<input type="button" name="c"  value="SIZE" onClick="getfilesize();">
</div>
  

I get first alert('hi size check') but from second line it cant work
Please help me.

Thanks in advance

[Lester Burnham]

What do you mean by "it can't work"? What exactly happens? Are there error messages in the Console?

[kavita vala]

No there is no error message but. But the second alert is not come so.
an error is in

   var oas = new ActiveXObject("Scripting.FileSystemObject");  

line but i could not able to find
Is there any other code to write for use above statement

[Lester Burnham]

Hard to tell what's happening if you don't tell us what error is occurring. You're aware that this will only work in IE, right?

[kavita vala]

ya but it cant work in ie also. Is there any other way that i should get the size of
Loaded file.

Please help me for this issue

[Eric Pascarello]

Where did you learn about .sie()? Did you make it up thinking it would work?

Eric