How to redirect js file with Javascript based on referer

Question

I have a website mydomain.com

I want,

• If visitor mydomain.com come from images.google.com then call otherdomain.com/file1.js

• If visitor come from another domain, then call otherdomain.com/file2.js

What sort of script should I be using on my domain to do this?mydomain.com

Answer 1

The only option you've got is to use document.referrer ; but it is not reliable or trustworthy.

When available, document.referrer will give you the come-from URI as a string; if it's not available it'll be empty ( "" ).

<script>
    if (document.referrer.indexOf('http://images.google.com/') === 0) {
        document.write('<script src="http://otherdomain.com/file1.js"><\/script>');
    } else {
        document.write('<script src="http://otherdomain.com/file2.js"><\/script>');
    }
</script>