By Jeremy Keith
Step by step consultant unearths top practices for boosting sites with Ajax
* A step by step consultant to improving websites with Ajax.
* makes use of revolutionary enhancement thoughts to make sure swish degradation (which makes websites usable in all browsers).
* indicates readers the best way to write their very own Ajax scripts rather than counting on third-party libraries.
Web web site designers love the assumption of Ajax--of developing web content during which info should be up to date with out clean the complete web page. yet should you aren't hard-core programmers, improving pages utilizing Ajax could be a problem. much more of a problem is ensuring these pages paintings for all clients. In Bulletproof Ajax, writer Jeremy Keith demonstrates how builders happy with CSS and (X)HTML can construct Ajax performance with no frameworks, utilizing the guidelines of sleek degradation and innovative enhancement to make sure that the pages paintings for all clients. all through this step by step advisor, his emphasis is on top practices with an method of construction Ajax pages referred to as Hijax, which improves flexibility and avoids worst-case scenarios.
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Extra info for Bulletproof Ajax
But it does contain an assumption. Just because a browser supports ActiveX doesn’t necessarily mean that the specific ActiveX object for Ajax also exists. This is the case with Internet Explorer 5 for Mac. As it stands, the getHTTPObject function throws an error in that browser. One solution might be to look at the user-agent string of the browser and check its name and version number. This is called browser sniffing. It’s a very bad idea. User-agent strings can be spoofed, and browser sniffing inevitably triggers false positives.
AppendChild(text); appendChild is always a method of an element node. Remember, only ele- ment nodes can be parents. This same method can be used to insert generated nodes into the document. Going back to our simple document, suppose I wanted to update the node tree by adding a new paragraph before the closing