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Implementing the REST Data
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For the scope of this chapter and this book, whenever data is being referenced by an Ajax application it will use the REST architectural style. The word REST will not be explicitly referenced in the patterns defined in this book, but it is implied. Let s define an initial Ajax example that implements the REST architectural style. Using Ajax and REST implies the following:
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The data is XML. The resource is defined as a Uniform Resource Locator (or URL, for example, http://mydomain.com/cgross/books) that references the representation books.xml. The data is retrieved from the HTTP server by using the HTTP GET command. The initial example implements a sample book query service that generates the following XML file: < xml version="1.0" encoding="UTF-8" > <User> <Book> <ISBN>1-59059-540-8</ISBN> <Title>Foundations of Object Oriented Programming Using .NET 2.0 Patterns</Title> <Author>Christian Gross</Author> </Book> <Book> <ISBN>0-55357-340-3</ISBN> <Title>A Game of Thrones</Title> <Author>George R.R. Martin</Author> </Book> </User>
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CHAPTER 2 THE NUTS AND BOLTS OF AJAX
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This retrieved XML content contains two books from a library. How the data is stored on the server side is the responsibility of the HTTP server. The data could be stored as an XML file or it could be dynamically generated. From the perspective of an external application, the data is based on XML. The description of the book is simple as there are three fields: ISBN, Title, and Author.
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The HTML content that contains the Ajax technology is implemented as a single HTML page. The HTML page does not include the XML content when the HTML page is downloaded. You could be cynical and say, but that is the point of Ajax for the XML content to be downloaded separately from the HTML page. This goes back to the example web page in Figure 2-1, where the XML file represents the brown area, and the downloaded page represents the blue areas. Following is the implementation of the Ajax application to download the XML books data: <html><head> <title>Sample Page</title> <script language="JavaScript" type="text/javascript"> var xmlhttp = null; xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); function GetIt( url) { if( xmlhttp) { EBVN xmlhttp.open('GET', url, false); xmlhttp.send(null); document.getElementById('result').innerHTML = xmlhttp.responseText; } } </script> </head> <body> <button onclick="GetIt('/cgross/books')">Get a document</button> <p><table border="1"> <tr><td>Document</td><td><span id="result">No Result</span></td></tr> </table></p> </body> </html> In the HTML content (the elements contained by the HTML body tags), a button is defined that when clicked will call the function GetIt. The parameter for the function GetIt is the URL for the resource that contains the XML book data. The data, when retrieved and processed, is presented in an HTML table, where one column (indicated by the td HTML tag) contains a span HTML tag. The span tag uses the attribute id to define a place where the retrieved data is displayed. The attribute id is a unique identifier that can be used by JavaScript to reference an HTML element.
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CHAPTER 2 THE NUTS AND BOLTS OF AJAX
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When the HTML page is processed, the script tag identifies a place where JavaScript can be defined to execute the Ajax logic. For all scripts in this book, JavaScript or JScript (Microsoft variation) will be used on the client side. The variable xmlhttp and the next line, xmlhttp = new ActiveXObject..., are not part of a function, meaning that they are executed when the HTML page is being loaded by the web browser. The executed lines of code instantiate an object instance of XMLHttpRequest, which is assigned to the variable xmlhttp. The variable xmlhttp will be used to download the resource /cgross/books or the associated representation /cgross/books.xml file that is stored on the server. Some developers may comment that it would have been safer to contain the logic in a function that is called when the HTML page has been completely loaded (window.onload). That is often good coding style, but it was not used in this example because that would be unnecessarily complicated for this demonstration. In the implementation of the function GetIt, the parameter url represents the URL of the document that will be downloaded (books.xml). Calling the method open creates a request that is sent by using the method send. The third parameter of open is the value false, which results in the HTTP request being executed synchronously. This means that when calling the method send, the method will return after the results have been retrieved from the server. The results are accessed in the script by using the property responseText and then assigned using dynamic HTML to the span element.
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