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CHAPTER 9 STATE NAVIGATION PATTERN
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thisReference.verifyWindowName(); xmlhttp.setRequestHeader( thisReference.constPageWindowName, window.name); var splitLocation = location.href.split( "#"); xmlhttp.setRequestHeader( thisReference.constPageOriginalURL, splitLocation[ 0]); } var xmlhttp = request._xmlhttp; request.complete = function( status, statusText, responseText, responseXML) { if(status == 200 && responseXML != null) { thisReference.verify = thisReference.extractLink; var objData = new Object(); XMLIterateElements( thisReference, objData, responseXML); location.replace( oldPath + "#" + xmlhttp.getResponseHeader( thisReference.constPageStateHeader)); location.href = objData.redirectURL; } } request.username = this.username; request.password = this.password; request.post( this.postURL, this.constResourceStateContentType, buffer.length, buffer); return false; EBVN } The implementation of the method saveState is more complicated and is responsible for generating the XML state and for sending the state to the server by using an HTTP POST. The variable buffer, and those lines at the beginning of saveState that reference buffer, are used to build the XML state. In the building of the state, the method this.onSaveState is called, letting the HTML page generate the custom parts of the persistence. After the XML state is constructed, it needs to be posted to the server. As in previous pattern implementations, an HTTP POST is created by using the Asynchronous class type outlined in 2. What is unique in this posting is the assignment of the custom HTTP headers (X-Page-State, X-Page-Window-Name, and X-Page-Original-URL) and the processing of the response. In the inlined function implementation of request.openCallback, the state reference identifier is extracted from the local URL as stored in the variable location. hash. If the location.hash value does not exist, a none is sent as the page state header to indicate that a state identifier should be created. Otherwise, the location.hash value is sent, minus the prefixed # character. What is new for this request is the assignment of the original URL (X-Page-Original-URL or constPageOriginalURL). This assignment is necessary so the server can cross-reference the state with the resource. Moving to the end of the saveState method implementation, you can see that the method request.post is used to post the data to the server. When the HTTP POST returns, the inlined method implementation request.complete is called to process the returned XML. The returned XML looks similar to the following:
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CHAPTER 9 STATE NAVIGATION PATTERN
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<data> <link id="redirect" href="/ajax/chap07/page2" /> </data> The returned XML content is processed by the inlined method request.complete. In the inlined method request.complete, the returned XML content is parsed by using the function XMLIterateElements. The function XMLIterateElements is a helper function used to process the returned XML content. Specifically, the function XMLIterateElements extracts the destination link from the returned XML content, which in the example happens to be the URL /ajax/ chap07/page2. In the inlined method, the extracted URL is assigned to the variable objData. redirectURL by the function XMLIterateElements. But before the extracted URL is reassigned, the state hash code is updated by calling the location.replace method. Then after the script replaces the URL, the script can navigate to the extracted URL by using the method location.href. A little side note needs to be added about the purpose of the returned XML. Figure 9-3 shows the problems when HTTP POST is used to navigate from HTML page to HTML page. As the State Navigation pattern navigates using the returned XML, the posting of the same content multiple times does not occur. Navigation occurs when using a script that uses HTTP GET techniques that are called after a successful posting. And the posting of the state twice is impossible because the state identifier is incremented for each posting. So if a resource is responsible for charging a credit card, posting the same content multiple times can be caught by the server and curtailed.
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EBVN
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Processing the Requests on the Server
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After the HTML page has been implemented and the state has been loaded and saved on the client side, the remaining responsibility lies with the server.The server will receive the state and store it somewhere, and send the state when it is asked for. However, the general pattern implementation on the server does not attempt to interpret the state, because doing so would add processing that is not necessary. The exception occurs when the processing of the state is application related. The state is processed on the server side by using HTTP handlers.
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