Many website owners 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. There are two main search engine issues around AJAX: Making sure that search engine bots can see your content, and making sure they can see and follow your navigation.
Content displayed via iFrames may not be indexed and available to appear in Google's search results. We recommend that you avoid the use of iFrames to display content. If you do include iFrames, make sure to provide additional text-based links to the content they display, so that Googlebot can crawl and index this content.Develop with progressive enhancement
If you're starting from scratch, a 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. 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
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