adding mobile browser detection, rule selection, into a ruleset - krl

Question

I would like to add functionality to a ruleset that fires a distinct rule based on whether or not the browser is mobile or not. (one rule fires for a standard browser, a different rule fires for a mobile browser) I know that the browser detection can be done any number of ways, but my first inclination would be with javascript.
Any thoughts on how to start with this?

Answer 1

You can use the useragent object, like this:
rule detect_agent {
select when pageview ".*"
pre {
browser_name = useragent:browser_name();
browser_version = useragent:browser_version();
os = useragent:os();
os_type = useragent:os_type();
os_version = useragent:os_version();
full_useragent = useragent:string();
message = <<
<p><strong>Information about your browser:</strong></br />
<em>Browser name:</em> #{browser_name}</br />
<em>Browser version:</em> #{browser_version}</br />
<em>Operating system:</em> #{os}</br />
<em>OS type:</em> #{os_type}</br />
<em>OS version:</em> #{os_version}</br /></p>
<p>#{full_useragent}</p>
>>;
}
append("body", message);
}
You might have to do some parsing of your own, though, since the browser_name and os may or may not be correct. Here's what it looks like in Chrome on a Mac (you can test it using this URL in any browser):
Here's what it looks like in Safari on an iPad:
Do some research into what the UserAgent strings look like for the browsers you care about. Then you can use the useragent:string() function together with match() to determine what to do with it. (If you want an example of how to do that, let me know.)