Download PDF by Shelley Powers: Adding Ajax

By Shelley Powers

ISBN-10: 0596529368

ISBN-13: 9780596529369

Including Ajax is perfect for the intermediate to complex net builders between you who're nervous and stressed approximately Ajax, considering that it'll strength you to begin over along with your craft. This clean consultant will calm these fears via supplying a wholly new method of the subject. instead of introduce Ajax as a very new manner of doing issues, this ebook exhibits you ways to combine Ajax with latest websites, and does so by way of construction to Ajax instead of construction from an Ajax starting place. via examining this e-book, you are going to find out how Ajax helps you to create "rich" internet purposes, yet extra importantly, you will see how the practices you persist with feed correct into Ajax - and that, more often than not, you already paintings with the applied sciences concerned. including bits and items frequently makes even more experience than tearing down and rebuilding, and you can learn how to combine Ajax together with your traditional strategy. on the finish of including Ajax, there is mirrored image on no matter if beginning over can be a enjoyable inspiration, yet through then you definitely will be even more ok with it.

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Example text

Figure 2-1 shows the application after processing a Drink request. It’s guaranteed to work in pretty much any browser or environment— a property of the application we don’t want to lose when we add Ajax functionality. Figure 2-1. A basic application response, showing that our PHP script behaves as expected 34 | Chapter 2: The Ajax Bits One restriction with the use of the application is that the form elements have to use the same names. It is important to note that the form elements have to be updated to match the recipe so that the form contents are kept in sync with the printout.

Each parameter uses the format keyword=value and each pair is separated from one another with an ampersand (&). send(params); With a POST request, you’ll also need to set the content type of the request header before sending the request. param=value¶m2=value2 If the parameters contain HTTP-sensitive characters, such as spaces, ampersands, or HTML characters such as angle brackets, you’ll need to escape the parameters. You can use the JavaScript built-in encodeURIComponent function to do this: var paramvalue = encodeURIComponent(value); Because the Drinks application is performing a simple query and we’re not concerned about hiding the parameter, the GET method is used with the drink name attached to the web service URL.

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. After settling on GET and POST, our next task, described in the following section, is to examine how to pass parameters with each HTTP request. Depending on which type of method is used, parameters are either passed as part of the URL or through one of the XMLHttpRequest methods. The Parameters More than one parameter can be passed to whatever web service is requested.

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Adding Ajax by Shelley Powers

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