Get The Current Domain Name With Javascript (Not the path, etc.)

I plan on buying two domain names for the same site. Depending on which domain is used I plan on providing slightly different data on the page. Is there a way for me to detect the actual domain name that the page is loading from so that I know what to change my content to?

I've looked around for stuff like this but most of it doesn't work the way I want it to.

For instance when using

document.write(document.location)

on JSFiddle it returns

http://fiddle.jshell.net/_display/

i.e. the actual path or whatever that is.

How about:

window.location.hostname

The location object actually has a number of attributes referring to different parts of the URL

If you are not interested in the host name (for example www.beta.example.com) but in the domain name (for example example.com), this works for valid host names:

function getDomainName(hostName)
{
    return hostName.substring(hostName.lastIndexOf(".", hostName.lastIndexOf(".") - 1) + 1);
}

Try to run in script : path: http://localhost:4200/landing?query=1#2

console.log(window.location.hash)

Location have following values:

window.location.hash: "#2"

window.location.host: "localhost:4200"

window.location.hostname: "localhost"

window.location.href: "http://localhost:4200/landing?query=1#2"

window.location.origin: "http://localhost:4200"

window.location.pathname: "/landing"

window.location.port: "4200"

window.location.protocol: "http:"

window.location.search: "?query=1"

function getDomain(url, subdomain) {
    subdomain = subdomain || false;

    url = url.replace(/(https?:\/\/)?(www.)?/i, '');

    if (!subdomain) {
        url = url.split('.');

        url = url.slice(url.length - 2).join('.');
    }

    if (url.indexOf('/') !== -1) {
        return url.split('/')[0];
    }

    return url;
}

Examples

getDomain('http://www.example.com'); // example.com
getDomain('www.example.com'); // example.com
getDomain('http://blog.example.com', true); // blog.example.com
getDomain(location.href); // ..

Previous version was getting full domain (including subdomain). Now it determines the right domain depending on preference. So that when a 2nd argument is provided as true it will include the subdomain, otherwise it returns only the 'main domain'

You can get it from location object in Javascript easily:

For example URL of this page is:

http://www.stackoverflow.com/questions/11401897/get-the-current-domain-name-with-javascript-not-the-path-etc

Then we can get the exact domain with following properties of location object:

location.host = "www.stackoverflow.com"
location.protocol= "http:"

you can make the full domain with:

location.protocol + "//" + location.host

Which in this example returns http://www.stackoverflow.com

I addition of this we can get full URL and also the path with other properties of location object:

location.href= "http://www.stackoverflow.com/questions/11401897/get-the-current-domain-name-with-javascript-not-the-path-etc"    
location.pathname= "questions/11401897/get-the-current-domain-name-with-javascript-not-the-path-etc"

If you are only interested in the domain name and want to ignore the subdomain then you need to parse it out of host and hostname.

The following code does this:

var firstDot = window.location.hostname.indexOf('.');
var tld = ".net";
var isSubdomain = firstDot < window.location.hostname.indexOf(tld);
var domain;

if (isSubdomain) {
    domain = window.location.hostname.substring(firstDot == -1 ? 0 : firstDot + 1);
}
else {
  domain = window.location.hostname;
}

http://jsfiddle.net/5U366/4/

Use

document.write(document.location.hostname)

window.location has a bunch of properties. See here for a list of them.

Since this question asks for domain name, not host name, a correct answer should be

window.location.hostname.split('.').slice(-2).join('.')

This works for host names like www.example.com too.

If you wish a full domain origin, you can use this:

document.location.origin

And if you wish to get only the domain, use can you just this:

document.location.hostname

But you have other options, take a look at the properties in:

document.location

ujjal

If you want to get domain name in JavaScript, just use the following code:

var domain_name = document.location.hostname;
alert(domain_name);

If you need to web page URL path so you can access web URL path use this example:

var url = document.URL;
alert(url);

for my case the best match is window.location.origin

What about this function?

window.location.hostname.match(/\w*\.\w*$/gi)[0]

This will match only the domain name regardless if its a subdomain or a main domain

I'm new to JavaScript, but cant you just use: document.domain ?

Example:

<p id="ourdomain"></p>

<script>
var domainstring = document.domain;
document.getElementById("ourdomain").innerHTML = (domainstring);
</script>

Output:

domain.com

www.domain.com

Depending on what you use on your website.

Alexandru Mihalcea

I figure it ought to be as simple as this:

url.split("/")[2]

来源：https://stackoverflow.com/questions/11401897/get-the-current-domain-name-with-javascript-not-the-path-etc

标签

javascript

domain-name