By Shelley Powers
Including Ajax is perfect for the intermediate to complex net builders between you who're anxious and careworn approximately Ajax, considering that it'll strength you to begin over together with your craft. This clean advisor will calm these fears through delivering a wholly new method of the subject. instead of introduce Ajax as a very new manner of doing issues, this publication exhibits you ways to combine Ajax with current websites, and does so by means of development to Ajax instead of development from an Ajax origin. by way of studying this ebook, you are going to find out how Ajax lets you create "rich" net functions, yet extra importantly, you will see how the practices you stick to feed correct into Ajax - and that, normally, you already paintings with the applied sciences concerned. including bits and items frequently makes even more feel than tearing down and rebuilding, and you may discover ways to combine Ajax along with your traditional approach. on the finish of including Ajax, there is mirrored image on even if beginning over may be a enjoyable inspiration, yet by way of then you definately may be even more ok with it.
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Additional resources for Adding Ajax
If you do need to add something globally, like a new Ajaxenabled menu that will appear on all of your site’s pages, encapsulate the code into a file that can then be incorporated into all your pages—such as a header file that’s incorporated into each page using server-side functionality. Minimize the amount of code you’ll add to each page by organizing code into libraries and including only the desired library on each page. Or consider using one of the freely available Ajax libraries. Several Ajax libraries are covered in Chapter 3 and are used throughout this book.
The XMLHttpRequest object is quite simple. The following methods are available in all of the target browsers discussed in this book: open The syntax is open(method,url[,async,username,password]). This method opens a connection to the given URL using the specified method (such as GET or POST). Optional parameters are async, a boolean value that sets the requests to be asynchronous ('true') or synchronous ('false'), and a username and password if required by the server process. If the async parameter is not provided, the request is asynchronous by default.
POST can also be used for retrieval to provide added security of parameters, as well as for managing web server requests where the number of parameters or the size of any individual parameter may be quite large. 40 | Chapter 2: The Ajax Bits GET and POST are universally supported by web browsers; PUT and DELETE, unfortunately, are not. This lack of support means that while PUT and DELETE could be very useful, they are simply not appropriate for Ajax applications (at the time of this writing), so they won’t be used in the examples in this book.