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Hijax
Hijax is a term for the application of progressive enhancement to AJAX. It is also known as 'Simplified Ajax'.〔(【引用サイトリンク】title=HIJAX - Simplified Ajax )〕 Hijax was proposed by Jeremy Keith as a technique for building web applications that degrade gracefully by only using AJAX techniques to 'hijack' form submissions and responses, updating the DOM to reflect the results of the request/response cycle.
== Development history ==
Ajax has truly revolutionized the web by creating a far better user experience. Gone are the days with long waiting for complete page loads during switching from one page to another. With Ajax only the target content is updated with less time, consumes less server-side resources, and reduces bandwidth loads drastically. However it was incapable of remembering the user's history and bookmarking as Ajax made no changes to the URL. Then came the URL hashing concept and the problem could be solved. But another important issue remained: web crawlers find it difficult to crawl into Ajax-based websites and hence became SEO unfriendly. Google implemented the concept of 'hashbang' to solve this problem too. (Exclamation sign (!) is used just after hash symbol (#) like in www.example.com/#!newcontent). But still not every search engine have adopted this, so AJAX is still a challenge for search engine optimization (SEO).
Problems like these could be solved using new techniques but the biggest problem faced by AJAX applications is its backward compatibility. For devices that do not support JavaScript, or simply has this functionality disabled, or that doesn't support XMLHttpRequest (XHR), Ajax is not just useless but also a huge problem as the content is not accessible. For this reason AJAX has faced many criticisms like ("...it must degrade well. It must still be accessible. It must be usable. If not, it is a cool useless piece of rubbish for some or many people." )
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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