Download Bulletproof Ajax by Jeremy Keith PDF

By Jeremy Keith

Step-by-step advisor finds top practices for reinforcing websites with Ajax

  • A step by step consultant to improving websites with Ajax.
  • Uses innovative enhancement strategies to make sure swish degradation (which makes websites usable in all browsers).
  • Shows readers the way to write their very own Ajax scripts rather than hoping on third-party libraries.

Web web site designers love the assumption of Ajax--of growing websites within which details could be up to date with out clean the full web page. yet if you happen to 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 information of sleek degradation and revolutionary 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 development Ajax pages referred to as Hijax, which improves flexibility and avoids worst-case scenarios.

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Extra resources for Bulletproof Ajax

Example text

XMLHttpRequest) { var xhr = new XMLHttpRequest(); } This is called object detection. XMLHTTP"); } return xhr; } The function, called getHTTPObject, begins by declaring a variable called xhr and assigning it a Boolean value of false. The plan is to change this value over the course of the function. else statement takes care of the object detection. First, test for the existence of the native XMLHttpRequest. If such an object exists, change XMLHttpRequest 49 the value of xhr to a new instance of the object.

Using this statement, you can attempt to execute some code and, if it doesn’t work, you can catch the error. The error won’t be displayed in the browser. XMLHTTP"); } catch(e) { xhr = false; } } The try block contains the attempt to assign an instance of the ActiveX object to the variable xhr. If that doesn’t work, the catch block sets the value to false. catch statement can be used to refine the getHTTPObject function even further. Later versions of Internet Explorer can use a newer ActiveX object to handle Ajax.

1 Loading. The open method has been called, but the send method hasn’t. ■ 2 Loaded. The send method has been called. The request has begun.

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