Question

My url on a page is like:

http://www.example.com/dir1/file.html?a=1

I need to extract:

http://www.example.com

how can I do this in javascript?

Answer 1

The window.location is an object with useful properties for this, details in this JSBin.

For that JSBin URL (http://jsbin.com/etima), here’s what you see (with some irrelevancies removed):

• href: http://jsbin.com/etima
• protocol: http:
• hostname: jsbin.com
• host: jsbin.com
• port:
• pathname: /etima
• search:
• hash:

So basically, combine the protocol, the hostname, and the port if any:

var loc, result;
loc = window.location;
result = loc.protocol + "//" + loc.hostname;
if (loc.port) {
    result += ":" + loc.port;
}