JavaScript Examples Bible - UserWorks Technologies

Chapter 4 ✦ The Document and Body Objects (Chapter 18)
Example
This demonstration requires two documents (and for IE, you’ll also need to
access the documents from a Web server). The first document, in Listing 18-11, simply
contains one line of text as a link to the second document. In the second document
(Listing 18-12), a script verifies the document from which the user came via a
link. If the script knows about that link, it displays a message relevant to the experience
the user had at the first document. Also try opening Listing 18-12 in a new
browser window from the Open File command in the File menu to see how the
script won’t recognize the referrer.
Listing 18-11: A Source Document
document.referrer Property 1
Visit my sister document
Listing 18-12: Checking document.referrer
document.referrer Property 2
if(document.referrer.length > 0 &&
document.referrer.indexOf(“18-11.htm”) != -1){
document.write(“How is my brother document?”)
} else {
document.write(“Hello, and thank you for stopping by.”)
}
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document.referrer