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get the filename of a path using String.lastInde xOf()

In test() method:
var path="C:\test\h ello.txt"; //returns -1 for path.lastIndexO f("\\").
why??
var pos=path.lastIn dexOf("\\"); //return -1

But in showFile() method:
We are able to get the filename. The only difference is test()
hardcode the path,
but in showFile() we gets the path from the file dialog.

Please advise. thanks!!

<script type="text/javascript">
function test()
{ //var path="C:\\test\ \hello.txt"; //good, it works
var path="C:\test\h ello.txt"; //returns -1 for
path.lastIndexO f("\\"). why??
var pos=path.lastIn dexOf("\\"); //unterminate string constant, use
"\\" for backslash
alert("pos=" + pos);
var filename = path.substring( pos+1);
alert(filename) ;
}

function showFile()
{ var path= InputForm.f1.va lue;
alert("path=" + path);
var pos=path.lastIn dexOf("\\"); //unterminate string constant, use
"\\" for backslash
alert("pos=" + pos);
var filename = path.substring( pos+1);
InputForm.filen ame.value = filename;
}
</script>
<form name="InputForm " action="page2.a sp" method="post">
<P><input type="button" name="b1" value="test file button"
onClick="test() ">
<P>File Name: <input type="text" name="filename" >
<P><input type="FILE" name="f1" onChange="showF ile()">
</form>
Jul 23 '05 #1
1 16369
On 24 Sep 2004 22:53:53 -0700, Matt <jr********@hot mail.com> wrote:
In test() method:
var path="C:\test\h ello.txt";
//returns -1 for path.lastIndexO f("\\").
why??
The backslash within a literal is an escaping character. The string, path,
above actually produces:

"C:<TAB>esthell o.txt"

which you should see with

alert(path);
var pos=path.lastIn dexOf("\\"); //return -1
That's why you need to (and do, correctly) escape the backslash in the
lastIndexOf call, as well.
But in showFile() method:
We are able to get the filename. The only difference is test()
hardcode the path,
but in showFile() we gets the path from the file dialog.


As I already said, with literals, defined with quotes, the backslash acts
as an escaping character. With a value - an evaluated literal, or obtained
from a property - the backslash is just a backslash; it has no meaning.
That's the difference between values and literals.

Hope that makes sense,
Mike

--
Michael Winter
Replace ".invalid" with ".uk" to reply by e-mail.
Jul 23 '05 #2

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