Get subdomain with domain if it exists?

I want to capture the sub domain if it exists? I currently can get domain:

var currDD = document.domain;
currDD=currDD.split(".").slice(-2).join(".");

but not sure how to tell if sub domain exists and capture it conditionally?

JavaScript

Last Comment

lightspeedvt

8/22/2022 - Mon

nap0leon

9/26/2012

Crude example:

<script type="text/javascript">
var URL = window.location.href;
var domain = document.domain;
//var domain = "my.subdomain.mysite.com"
//var domain = "subdomain.mysite.com"
var arrDomain = domain.split('.')
var domainLength = arrDomain.length;

if (domainLength > 2) {
    for (i=0;i<domainLength-2;i++){
      document.write(arrDomain[i])
      if (i != domainLength-3) { document.write('.') }
    }
} else {
    document.write('no subdomain')
}
</script>

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9/26/2012

ASKER

I need to capture the sub domain if present. Examples:

"www.subdomain.mysite.com" --> "subdomain.mysite.com"

"www..mysite.com" --> "mysite.com"

lightspeedvt

9/26/2012

This can be achieved via Regular Expressions:

var currDD = document.domain;
var patt = /(?:[w]{3}\.)?([^.]+)\..*\./gi
subdomain=patt.exec(currDD)[1];

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Sure, a lot of people can make much better RegExp pattern.

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William Peck

9/27/2012

ASKER

won't window.location.hostname work?

ASKER CERTIFIED SOLUTION

lightspeedvt

9/30/2012

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