Referrer of a page by document referrer property

We can use document.referrer property to get the referrer to this page. What is a referrer ? Very basic answer is how you have arrived at this page. You could have clicked a link in some other page of this site or some other site. You could have searched for a key word in search engine and clicked a link at search result page to arrive at this page. In this case the search engine page has became the referrer for this page. But if you have typed the address or url of this page in the address bar of your browser and opened this page then there is no referrer and the value of referrer became blank or null.

The value of referrer became important as it gives information about the source of traffic to a site. Some time referrer value is used to redirect visitors to different pages based on requirement. Here is an example of code to get the referrer by using JavaScript document object.

<script language="javascript">
var ref=document.referrer;
document.write('You have arrived from<BR> '+ref)
Here is the output ( if your browser referrer is available )
Use the menu in left and arrive at this page from different pages and check how the referrer value changes.
Please note that it is not possible to always get the referrer value from the visitor browser even if the visitor has clicked a valid link and arrived at the page. Referrer value can be prevented from carrying by the browser settings.

In Firefox how to change referrer setting of the browser is explained here.

Referrer can be found out by using server side scripts also. You can read how to get referrer in PHP here and how to get referrer value in ASP here.
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