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You know that the header text exists if the hasChildNodes method returns true; if it does, delete the first (and only) child node of the span element, as that child node represents the header text The next task in clearPreviousResults is to delete any rows that may already be in the table displaying the search results Any result rows are child nodes of the tbody node, so you start by obtaining a reference to that node using the documentgetElementById method Once you have the tbody node, you iterate for as long as the tbody node has child nodes, where the child nodes are tr elements During each iteration the first child node in the childNodes collection is removed from the table body The iteration ends once no more rows are left in the table body The table of search results is built in the parseResults function.

Once the interface definitions are in place, the last remaining step is to implement them in the Web service code-behind. The first step is to derive the Web service class file from the interface definition; and the second step is to override the abstract methods, as shown in Listing 3-5. Listing 3-5. Deriving the Web Service .asmx Code-Behind Class from the Generated Interface Definition Class (StockTraderStub) // Step 1 (Before View): Implement the StockTraderStub class [WebService(Namespace = "http://www.bluestonepartners.com/schemas/StockTrader")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class StockTraderService : StockTraderStub { // Contains abstract methods (not shown) } // Step 2 (After View): Override and implement each of the abstract class methods [WebService(Namespace = "http://www.bluestonepartners.com/schemas/StockTrader")] public class StockTraderService : StockTraderStub { [WebMethod] [return: XmlElement(ElementName = "Quote", Namespace = "http://www.bluestonepartners.com/schemas/StockTrader/")] public override Quote RequestQuote(string Symbol) { // Implementation code goes here } } You need to set namespace names for both the Web service class and the interface definition classes. We usually include all classes within the same namespace, but there is no rule about this. If you do use different namespaces, then in the Web service class file you will need to import the namespace for the interface definition classes. At this point everything is in place to complete the implementation of the Web service methods. All operations and types are fully described and ready to be referenced from the Web service class file. Listing 3-6 shows an example implementation of the PlaceTrade Web method, which places a trade order and returns the trade details in a custom object type called Trade. Listing 3-6. The PlaceTrade Web Method [WebMethod] [SoapDocumentMethod(RequestNamespace= "http://www.bluestonepartners.com/schemas/StockTrader/", ResponseNamespace="http://www.bluestonepartners.com/schemas/StockTrader/", Use=SoapBindingUse.Literal, ParameterStyle=SoapParameterStyle.Bare)] [return: XmlElement("Trade", Namespace=

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String Overrides ..................................................................................................... 274 Workflow .............................................................................................................. 275 Modules that add additional field types

This function starts by creating a local variable named results, which is the XML document retrieved from the XMLHttpRequest object s responseXML property You use the getElementsByTagName method to retrieve all the property elements in the XML document as an array and assign the array to the local variable properties Once you have the array of property elements, you can iterate over each element in the array and retrieve the property s address, price, and comments var properties = resultsgetElementsByTagName("property"); for(var i = 0; i < propertieslength; i++) { property = properties[i]; address = propertygetElementsByTagName("address")[0]firstChildnodeValue; price = propertygetElementsByTagName("price")[0]firstChildnodeValue; comments = propertygetElementsByTagName("comments")[0]firstChildnodeValue; addTableRow(address, price, comments); } Let s examine this iteration closely, as this is the heart of the parseResults function.

"http://www.bluestonepartners.com/schemas/StockTrader/")] public override Trade PlaceTrade(string Account, string Symbol, int Shares, System.Double Price, TradeType tradeType) { Trade t = new Trade(); t.TradeID = System.Guid.NewGuid().ToString(); t.OrderDateTime = DateTime.Now.ToLongDateString(); t.Symbol = Symbol; t.Shares = Shares; t.Price = Price; t.tradeType = tradeType; // Initialize the Trade to Ordered, using the TradeStatus enumeration t.tradeStatus = TradeStatus.Ordered; // Code Not Shown: Persist trade details to the database by account number // and trade ID, or to a message queue for later processing // Code goes here return t; // Return the Trade object } Notice that we have reapplied all of the XML and SOAP serialization attributes that were included in the IDC file. You need to do this to ensure that they take effect. Also notice the use of several custom types, including Trade (a complex type that stores the trade details), TradeType (an enumeration for the type of trade being executed), and TradeStatus (an enumeration for the current status of the trade). Assuming that you have followed the steps so far, your Visual Studio 2005 Solution Explorer will look like Figure 3-5.

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