How to show previous domain with javascript document.referrer

Question

I want to show the domain that user came from to my page with document.referrer. But I dont want to show all name of this site for example: www.mysite.pl/page2314 but only the domain - www.mysite.pl

How to do that?

@user1743942: For your information, it is possible to edit your questions and add such information. — David Pärsson, Dec 08 '12 at 19:11

David Pärsson · Accepted Answer · 2012-12-07T10:58:42.613

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You can among other things use a regular expression like this:

var referrer = document.referrer
var doman = referrer.match(/:\/\/([^/]+)\//)[1]

This will match anything in an url after :// up to (but not including) the following /.

If document.referrer is http://stackoverflow.com/questions, the matched domain will be stackoverflow.com.

edited Dec 07 '12 at 10:58

answered Dec 07 '12 at 10:51

David Pärsson

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Thank you. Can you tell me what to do with `www.` I want to remove it when someone comes from www.mypage.pl/xxxx – user1743942 Dec 07 '12 at 11:18
@Glutamat: What does `?:` do in `(?:www\.)?`? – David Pärsson Dec 07 '12 at 16:56
The `?:` hides a capture group – Moritz Roessler Dec 07 '12 at 17:02
Now i got the right Term, it makes it a "non-capturing" group – Moritz Roessler Dec 07 '12 at 17:11
If you want to have it explained in detail: http://stackoverflow.com/questions/3512471/non-capturing-group – Moritz Roessler Dec 07 '12 at 17:13

Moritz Roessler · Answer 2 · 2012-12-07T11:09:39.913

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What about a regex which only matchs the first part ? like

Edited: thx @David

document.referrer.match(/((ht{1}(tp|tps):\/\/)[\w\d\S]+?)\//g)[0] //"http://stackoverflow.com/"

Of course you can use any suitable regex

edited Dec 07 '12 at 11:09

answered Dec 07 '12 at 10:52

Moritz Roessler

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What if the referrer starts with `https`? – David Pärsson Dec 07 '12 at 10:53

score 0 · Answer 3 · answered Dec 07 '12 at 10:52

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var ref = document.referrer;
ref = ref.substring(ref.indexOf("://") + 3)
ref = ref.split("/")[0];

Now ref only contains the domain. A different approach would be with regex.

answered Dec 07 '12 at 10:52

Not all domain names start with `www`. – David Pärsson Dec 07 '12 at 10:54
yeah, i thought of it after. i was thinking of the given example. i'll make the correction. – Dec 07 '12 at 10:55

How to show previous domain with javascript document.referrer

3 Answers3