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CHAPTER 9 STATE NAVIGATION PATTERN
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it as being some text in an HTML div section. It is the responsibility of the HTML methods onSaveState and onLoadState to load and save the data. In the HTML page implementation, the methods onSaveState and onLoadState could be construed as black magic in that they generate and process data without explaining what the data is. What happens is that the data generated and processed by the HTML page is a blob that is sent and received from the server. Only the client needs to know what the data is, and not the State Navigation implementation. In the example, the variable StateController uses XML persistence as a default persistence format. As a result, when the client uses the standard method calls saveForm and loadForm, the generated data is XML based and would be identical to the following: <state> <html-page> <form id="BasicForm" > <element id='param1' type='text'>Value 1</element> <element id='param2' type='text'>Value 2</element> </form> </html-page> </state> The root node is data, and contained within it is the HTML state that includes reference information about the state, and the state information associated with the HTML page. Specifically, the individual XML tags are identified as follows:
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html-page: Is a parent XML element used to contain the state details associated with an HTML page. form: Is a parent XML element used to contain the values for all HTML form elements. element: Identifies a state that is associated with an HTML form element. In the example, all HTML form elements are associated with the XML tag element. But it is also possible to use the id attribute as an XML element identifier. This results in the transformation <param1 ... /> for the XML element with the attribute value param1. Which approach you use depends on your preference; either approach is acceptable. For consistency, the state that is sent is identical to the state that is received.
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The Details of the State Navigation
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StateController is a variable instance and a custom single kind of a type. StateController
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could have been defined as a type that is instantiated, but that would be adding unnecessary complexity. As I am explaining the technical details of StateController, I won t explain all of the code at once. What I will explain is the source code in three pieces: the first piece contains the data members, the second piece contains the logic used to load the state, and the last piece contains the logic to save the state. Following is the code piece that defines the data members of the StateController variable:
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CHAPTER 9 STATE NAVIGATION PATTERN
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var StateController = { username: null, password: null, postURL: null, constPageStateHeader : "X-Page-State", constPageWindowName : "X-Page-Window-Name", constPageOriginalURL : "X-Page-Original-URL", constPageWindowNamePrefix : "StateController", constResourceStateContentType : "application/xml", constURLStateIdentifier : "/state", constStateTag : "state", constHtmlPageStateTag : "html-page",
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StateController has nine data members, which all relate to sending and receiving data to and from the server. The data members username and password are the authentication identifiers used when accessing protected resources. The data member postURL indicates the URL used to post the data to the server. In a traditional HTML form, postURL would be the action attribute identifier. As an optimization, if an HTML form is serialized, the data member postURL is assigned the HTML form action attribute value. The remaining data members are used to dissect the communications between the client and server, and to generate and parse the XML data.
Loading the State When the HTML page is loaded, the event onload is triggered and causes the HTML state to be retrieved and added to the HTML page. The onload event is the usual place to put the stateloading functionality, but any other event could be used. Regardless of where the state-loading functionality is added, three functions are related to state loading: client implementation, default form loading, and overall controlling functionality. Following is the default client implementation: onLoadState : function( status, responseXML) { }, The method onLoadState, when it is not implemented by the HTML page, is an empty implementation that does nothing. In the example HTML page, the onLoadState method called the method loadForm, which is used as a prepackaged function to load the state of an HTML form. The method loadForm is implemented as follows: extractFormData : function( element, objData) { if( element.nodeType == 1) { if( element.nodeName == "form") { objData.formId = element.attributes.getNamedItem( "id").nodeValue; objData.formNode = document.forms[ objData.formId]; }
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