178 CHAPTER 6 DECOUPLED NAVIGATION PATTERN After (Web hosting compare)
178 CHAPTER 6 DECOUPLED NAVIGATION PATTERN After the Action functionality has been executed, the property obj.state will be assigned and will be ready to be processed by the data function reference. The details of using the data function reference are illustrated again here: obj.isRemote = false; if ( (data) != null) { if ( data( obj) != true) { return false; } } if( obj.isRemote) { return true; The calling sequence of the data function reference is identical to the calling sequence of the action function reference. What is different is the assignment of the property obj.isRemote = false. The difference is due to the ability of the data function reference to process the state locally or remotely. If the data function reference processes the state remotely, an asynchro nous call is made and further processing can continue only after the remote server has sent a response. The DecoupledNavigation_call function cannot continue and must return control to the web browser. The property assignment is used to indicate whether a remote server call is made. If a remote call is made, the presentation function reference cannot be called, and the function DecoupledNavigation_call returns a value of true. E B V N This raises the question of whether a trueor false value should be returned if the obj. isRemote property has a true value. Returning a value of true means that the event will continue to bubble, and depending on the context that might not be the best plan of action. The best plan of action depends on the context, and there is room for improvement in how the return value of the data function reference is handled. If the data is processed locally, the Presentation functionality can be called. The calling sequence is illustrated as follows: if( presentation != null) { if( presentation( obj, obj.state) != true) { return false; } } The calling of the Presentation functionality is identical to the Action and Data functional ities. The additional parameter obj.state is the state, and its presence makes it possible to recursively chain together multiple presentation functionalities, as illustrated in Figure 6-13. Figure 6-13 illustrates how the function MyPresentation acts as a front processor for the functions InjectHTML and InjectTextbox. Because the state is a parameter, the front processor can filter out the appropriate state structure and then pass that state structure to the other Presentation functionalities. If state were not a parameter, the front processor would have to reassign the state property of the common variable. The implementation of the function DecoupledNavigation_InitializeRemote has been delegated until a remote server call example is made. For now, the focus is on using the DecoupledNavigation class to perform a local call.
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