Tuesday, November 06, 2007 at 4:52 PM
Update on July 29, 2010: We've improved our Flash indexing capability and we also now support an AJAX crawling scheme! Please check out the posts (linked above) for more details.
Many webmasters have discovered the advantages of using Ajax to improve the user experience on their sites, creating dynamic pages that act as powerful web applications. But, like Flash, Ajax can make a site difficult for search engines to index if the technology is not implemented carefully. As promised in our post answering questions about Server location, cross-linking, and Web 2.0 technology, we've compiled some tips for creating Ajax-enhanced websites that are also understood by search engines.
How will Google see my site?
Design for accessibility
Develop with progressive enhancement
If you're starting from scratch, one good approach is to build your site's structure and navigation using only HTML. Then, once you have the site's pages, links, and content in place, you can spice up the appearance and interface with Ajax. Googlebot will be happy looking at the HTML, while users with modern browsers can enjoy your Ajax bonuses.
<a href=”ajax.htm?foo=32” onClick=”navigate('ajax.html#foo=32'); return false”>foo 32</a>
Note that the static link's URL has a parameter (?foo=32) instead of a fragment (#foo=32), which is used by the Ajax code. This is important, as search engines understand URL parameters but often ignore fragments. Web developer Jeremy Keith labeled this technique as Hijax. Since you now offer static links, users and search engines can link to the exact content they want to share or reference.
While we're constantly improving our crawling capability, using HTML links remains a strong way to help us (as well as other search engines, mobile devices and users) better understand your site's structure.
Follow the guidelines
This is a pretty advanced topic, so please continue the discussion by asking questions and sharing ideas over in the Webmaster Help Group. See you there!