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In either case, it is the DataPortal.Update() call that ultimately triggers the data portal infrastructure to move the object to the application server so it can interact with the database. It is important to notice that the Save() method returns an instance of the business object. Recall that .NET doesn t actually move objects across the network; rather, it makes copies of the objects. The DataPortal.Update() call causes .NET to copy this object to the server so the copy can update itself into the database. That process could change the state of the object (especially if you are using primary keys assigned by the database or timestamps for concurrency). The resulting object is then copied back to the client and returned as a result of the Save() method.

This size value encodes the dimensions (width and height in pixels) of the related visual expression and is managed through the ExprSize type, which provides various members to compute precise dimensions. Basically, this is the type that handles the gory details of putting small visuals together to compose a large expression and manages how and where these small visuals should be placed. The main guideline is to align these visuals on a line (measured from the top of the expression in pixels and stored in the midline field), as depicted in Figure 12-3.

It is critical that the UI update all its references to use the new object returned by Save(). Failure to do this means that the UI will be displaying and editing old data from the old version of the object.

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Note When assigning to the onreadystatechange property, remember not to include the parentheses on the end of the function. You want to assign a reference to the function itself, not to the function's result.

As noted earlier, the data portal places certain constraints on business objects. Specifically, it needs to know what methods it can invoke on the server. The data portal will invoke the methods listed in Table 4-10, though not all framework base classes need to implement all the methods. Collectively, I ll refer to these methods as the DataPortal_XYZ methods. Table 4-10. Business Object Methods Invoked by the Data Portal

Figure 12-3. Expressions and their sizes The darker rectangles in this figure denote arbitrary expressions, whereas the lighter rectangle marks the dimensions of the parent expression aligned on the midline.

DataPortal_Create()

Listing 12-10 shows the type VisualExpr that carries the main visual element and the rendering options that were used to produce it. This type also provides the method OfExpr to build a VisualExpr from an Expr.

request.onreadystatechange = doSomething; After you ve specified where the object should send a request and what it should do once it receives a response, you can start the process using the send method: request.send(null); When a browser doesn t support the XMLHttpRequest object, the getHTTPObject function returns false, so you ll need to handle that case as well. When the server sends a response back to the XMLHttpRequest object, a number of properties are made available. The readyState property is a numeric value that is updated while the server deals with the request. There are five possible values: 0 for uninitialized 1 for loading 2 for loaded 3 for interactive 4 for complete

An editable business object implements this method to load itself with default values required for a new object. An editable or read-only business object implements this method to load itself with existing data from the database. An editable business object implements this method to insert its data into the database. An editable business object implements this method to update its data in the database. An editable business object implements this method to delete its data from the database. An editable business object implements this method to delete its data from the database based on its primary key values only. A command object (see 5) implements this method to execute arbitrary code on the application server. This method is invoked on all objects before one of the preceding methods is invoked. This method is invoked on all objects after any of the preceding methods have been invoked. This method is invoked on an object if an exception occurs on the server; in this case, DataPortal_OnDataPortalInvokeComplete would not typically be invoked.

Listing 12-10. Visual Expressions for the Visual Symbolic Differentiation Application type VisualExpr = { Expression : VisualElement;

DataPortal_Fetch()

RenderOptions: RenderOptions; }

DataPortal_Insert() DataPortal_Update() DataPortal_DeleteSelf() DataPortal_Delete()

Once the readyState property has a value of 4, you have access to the data sent by the server. You can access this data as a string of text provided by the responseText property. If the data is sent back with a Content-Type header of "text/xml", you can also access the responseXML property, which is

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