URL String Get Directory

Question

I have a string that contains a URL:

var url = "http://www.domain.com/Shared%20Documents/Test%20Plans/CC-12%20Test%20Plan.doc";

I am trying to get the url of the directory (ie remove the filename and keep the rest.) I realize that this is probably pretty simple but I can't seem to find anything on it.

Desired result:

var url = "http://www.domain.com/Shared%20Documents/Test%20Plans/";

Answer 1

 var resultUrl = url.substring(0, url.lastIndexOf("/") + 1);

Working jsfiddle here