Javascript based redirect: will it hurt SEO?

I recently implemented a fix to create separate landing page开发者_开发百科s depending on whether or not the user has javascript enabled. Basically the way it works is this.

The default page is an HTML page w/ no javascript. Basic version of the site. Upon landing on it, there is a script that says if javascript is enabled then go to another page. That landing page is generated by sending the user request through a JSP file that renders the page (header, footer, etc.). The final landing page is http://whatever.com/home.jsp if the user has javascript enabled.

My question is if this will hurt SEO. Considering 99% of the world has javascript enabled I would hate to compromise any SEO benefit to accomodate the 1% who doesn't enable javascript.

Hope that make sense.

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In general, searchbots should be treated as browsers with JS disabled. I think you can now imagine where they'll land.

This whole question is by the way completely unrelated to JSP. It is just a server side view technology which provides a template to write HTML/CSS/JS in and provides capabilities to control the page flow dynamically with taglibs and access backend data with EL. All what webbrowsers and bots sees (and thus all what counts for SEO) is its generated HTML output.

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http://www.google.com/support/webmasters/bin/answer.py?answer=66355

Short version, if your JS sends them to entirely different content, it's probably bad, and Google may give you a a hard time. Other than that, you should be good.

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If the alternative version is an (almost) full-featured, full-content version, then it's perfectly OK.

Google even advices for making alternatives for Flash-only sites, for example, in regard to usability.

Read google FAQ

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You touch two topics, one is described as "Cloaking", the other as "Duplicate Content". With "cloaking", you present different (optimized-with-bad-intention) content based upon identification of the client that accesses it, e.g. by inspecting the User-agent header (google-bot versus Browser). You are not doing this, you just want to present content in a way that suits your client best, like a redirect on a page optimized for mobile clients ("m.example.com").

The other thing is how to avoid duplicate content. There's a way by indicating the original content source with a canonical tag, see here: http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html