9: WORKING WITH DYNAMIC DATA AND AJAX in Java

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CHAPTER 9: WORKING WITH DYNAMIC DATA AND AJAX
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Figure 9-12: The XML being pulled in and loaded to display My Favorite Books widget
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WORKING WITH JSON DATA
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JSON stands for JavaScript Object Notation, which is similar to XML, but was created only for JavaScript. JSON allows you to create your own data structures in the form of name/value pairs. JSON and XML are alike in they are both hierarchical and can be processed with Ajax. JSON has some advantages over XML; I personally find that JSON is easier to read. You don t have tags to define the structure; the structure is defined by the data. This cleaner approach leads to code that is much more concise than XML and easier to work with and understand. Debates continue to rage online about whether JSON or XML is better, so it comes down to personal opinion. The following code is an example of JSON code also shown in Figure 9-13. I have used the same data from the preceding XML example so you can see how the two types of data compare. At a quick glance, you can see that the JSON is much easier to read. Whether that s a big advantage is debatable most of the time, your scripts, not a human, will be reading the JSON code.
{ books :[ { title : I m a Stranger Here Myself: Notes on Returning to America After 20 Years Away ,
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PART IV: EXPLORING ADVANCED JQUERY
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author : Bill Bryson , category : Travel , pubdate : 06/2000 , isbn : 0767903820 }, { title : Open: An Autobiography , author : Andre Agassi , category : Biography , pubdate : 11/2009 , isbn : 0307268198 }, { title : The Art of the Start: The Time-Tested, Battle-Hardened Guide for Anyone Starting Anything , author : Guy Kawasaki , category : Business , pubdate : 09/2004 , isbn : 1591840565 }, { title : Founders at Work: Stories of Startups Early Days , author : Jessica Livingston , category : Business , pubdate : 09/2009 , isbn : 1430210788 }, { title : Getting Real: The smarter, faster, easier way to build a successful web application , author : Jason Fried , category : Business , pubdate : 09/2009 , isbn : 0578012810 } ] }
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When you re writing JSON code yourself, you should use a validator to make sure the JSON is valid with no mistakes. If it s not valid, when you try to pull it into a page using GET, you end up with no content and an error message. Douglas Crockford created a JSON validator called JSONLint (www.jsonlint.com/), shown in Figure 9-14, that accepts raw JSON or the URL where the JSON code is located. If you pass JSON into this tool that does not validate, you receive an error message that helps you to solve any issues. Figure 9-14 shows the preceding JSON code after it has been processed in the JSONLint tool and passed as valid.
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CHAPTER 9: WORKING WITH DYNAMIC DATA AND AJAX
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Figure 9-13: The preceding JSON example when viewed in the browser
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Figure 9-14: The JSONLint Validator by Douglas Crockford
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PART IV: EXPLORING ADVANCED JQUERY
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RETRIEVING INTERNAL JSON DATA AND CREATING HTML
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Using the JSON code from the preceding example, I m going to show you how to use jQuery to load JSON using an Ajax request and then parse the JSON as HTML content on your page as shown in Figure 9-15. I use the ajax() method, but could also use the shorthand get JSON() method. Retrieving JSON data using jQuery is very similar to retrieving XML data. Fewer steps are involved because the data is already in JavaScript format, which makes it a faster alternative to XML. The end result of this script is an unordered list of all five of my favorite books, as shown in Figure 9-12. 1. First, you need to set up the HTML that will contain the unordered list of books. Create an unordered list with the ID of #books.
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