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generateTypedConstructor; var Territory=gtc("Territory"); In JavaScript, you define a class by creating a no-parameter constructor Essentially, the TerritoriesService class stores the location of your web service and uses a few magic bits from the Atlas script library to allow you to call it If you create a page that uses this web service, Atlas adds a link that imports this JavaScript code so you can use the TerritoriesService variable as a web service proxy It s worth pointing out that Atlas web service calls do not use SOAP, because SOAP support is not present in JavaScript (at least not without a separate component) Instead, Atlas web service calls use JavaScript Object Notation (JSON), a lightweight text-based data exchange format that s easier to construct on the client JSON does not use XML, but it does support arrays (as lists of values) and structures (using name/value pairs).

public override Type ExtensionType { get { return typeof(SoapLog); } } In addition, you can add properties that will supply extra bits of initialization information to your SOAP extension. The following example adds a Name property, which stores the source string that will be used when writing event log entries, and a Level property, which configures what types of messages will be logged. If the level is 1, the SoapLog extension will log only error messages. If the level is 2 or greater, the SoapLog extension will write all types of messages. If the level is 3 or greater, the SoapLog extension will add an extra piece of information to each message that records the stage when the log entry was written. private string name = "SoapLog" ; public string Name { get { return name;} set { name = value; } } private int level = 1; public int Level { get { return level;} set { level = value; } } You can now apply this custom attribute to a web method and set the Name and Level properties. Here s an example that uses the log source name EmployeesService.GetEmployeesCount and a log level of 3: [SoapLog(Name="EmployeesService.GetEmployeesCount", Level=3)] [WebMethod()] public int GetEmployeesCount() { ... } Now, whenever the GetEmployeesCount() method is called with a SOAP message, the SoapLog class is created, initialized, and executed. It has the chance to process the SOAP request message before the GetEmployeesCount() method receives it, and it has the chance to process the SOAP response message after the GetEmployeesCount() method returns a result.

The send() method fires off the request. Assuming your request is asynchronous, it returns immediately. xmlRequest.send(null); Optionally, the send() method takes a single string parameter. You can use this to supply additional information that s sent with the request, like the values that are sent with a POST request.

However, JSON obviously won t support SOAP-based features, such as SOAP headers or SOAP extensions The need to use JSON is another reason why Atlas web services must use a different HTTP handler than ordinary asmx web services..

Cross-page posting introduces a few wrinkles when you use it in conjunction with the validator controls described in 4. As you learned in 4, when you use the validator controls, you need to check the Page.IsValid property to ensure that the data the user entered is correct. Although users are usually prevented from posting invalid pages back to the server (thanks to some slick client-side JavaScript), this isn t always the case. For example, the client browser might not support JavaScript, or a malicious user could deliberately circumvent the client-side validation checks.

On Internet Explorer browsers, it s acceptable to leave out the parameter for the send() method. However, in Firefox you must supply a null reference, or the callback will behave erratically. This is one of the many quirks you ll find in cross-browser compatibility when writing client-side script.

Imports SystemWebCompilation Imports SystemCodeDom Imports SystemComponentModel Public Class RandomNumberExpressionBuilder Inherits ExpressionBuilder .. End Class To simplify life, it helps to create a Shared method that performs the task you need (in this case, random number generation): Public Shared Function GetRandomNumber(ByVal lowerLimit As Integer, ByVal upperLimit As Integer) As String Dim rand As New Random() Dim randValue As Integer = randNext(lowerLimit, upperLimit + 1) Return randValueToString() End Function The advantage of this approach is that when you use CodeDOM, you simply generate the single line of code needed to call the GetRandomNumber() method (rather than the code needed to generate the random number) Now, you need to override the GetCodeExpression() method This is the method that ASP NET calls when it finds an expression that s mapped to your expression builder (while compiling the page).

When you use validation in a cross-page posting scenario, the potential for some trouble exists. Namely, what happens if you use a cross-page postback and the source page has validation controls Figure 6-4 shows an example with a RequiredFieldValidator that requires input in a text box.