Cross-browser URL parsing in JavaScript

ParsedUrl.js

function ParsedUrl(url) {
	var parser = document.createElement("a");
	parser.href = url;
	
	// IE 8 and 9 dont load the attributes "protocol" and "host" in case the source URL
	// is just a pathname, that is, "/example" and not "http://domain.com/example".
	parser.href = parser.href;
	
	// IE 7 and 6 wont load "protocol" and "host" even with the above workaround,
	// so we take the protocol/host from window.location and place them manually
	if (parser.host === "") {
		var newProtocolAndHost = window.location.protocol + "//" + window.location.host;
		if (url.charAt(1) === "/") {
			parser.href = newProtocolAndHost + url;
		} else {
			// the regex gets everything up to the last "/"
			// /path/takesEverythingUpToAndIncludingTheLastForwardSlash/thisIsIgnored
			// "/" is inserted before because IE takes it of from pathname
			var currentFolder = ("/"+parser.pathname).match(/.*\//)[0];
			parser.href = newProtocolAndHost + currentFolder + url;
		}
	}
	
	// copies all the properties to this object
	var properties = ['host', 'hostname', 'hash', 'href', 'port', 'protocol', 'search'];
	for (var i = 0, n = properties.length; i < n; i++) {
	  this[properties[i]] = parser[properties[i]];
	}
	
	// pathname is special because IE takes the "/" of the starting of pathname
	this.pathname = (parser.pathname.charAt(0) !== "/" ? "/" : "") + parser.pathname;
}

// Use:
var myUrl = new ParsedUrl("http://www.example.com:8080/path?query=123#fragment");

Usage (demo JSFiddle here):

var myUrl = new ParsedUrl("http://www.example.com:8080/path?query=123#fragment");

Result:

{
    hash: "#fragment"
    host: "www.example.com:8080"
    hostname: "www.example.com"
    href: "http://www.example.com:8080/path?query=123#fragment"
    pathname: "/path"
    port: "8080"
    protocol: "http:"
    search: "?query=123"
}

Sadly this doesn't support the extraction of password, username and searchParams.
Thanks though.

Actually, @slavikme, if I'm not mistaken, to get username and password, you only had to add it to the properties array on line 25. And, if by searchParams you mean a URLSearchParams, you could build one using this.search.

It is important to notice, though, that there may be today other better options for parsing a URL. This solution is good because it works for IE 6 and above, which is a lot. Perhaps your requirements are not as demanding.