pdf417 java Calling and handling from JavaScript a web method that returns a complex type in VS .NET

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Listing 5.7 Calling and handling from JavaScript a web method that returns a complex type
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<div> <input id="GetDeals" type="button" value="Get Deals" onclick="getDeals()" /> <div id="Deals"></div> </div> ... function getDeals(){ AspNetAjaxInAction.StarbucksService.GetDeals(onGetDealsSuccess, onGetDealsFailure); } function onGetDealsSuccess(result, context, methodName){ var sb = new Sys.StringBuilder(); for (var i = 0; i < result.length; i++){ var bev = result[i]; sb.append(bev.Name + " - "); Declare sb.append(bev.Description + " - "); properties sb.append(bev.Cost + "<br />"); }
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Retrieve deals
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Making asynchronous network calls
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$get("Deals").innerHTML = sb.toString(); } function onGetDealsFailure(error, context, methodName){ $get("Deals").innerHTML = error.get_message(); }
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Listing 5.7 begins with the declaration of a button on the form that you use to kick off the request in a function called getDeals. From there, you call the B GetDeals method on the server and assign callback functions for both success and failure scenarios. If the call returns successfully, you instantiate an instance of the client C StringBuilder object and format the result. Notice how the D properties you declared in the server class (Name, Description, and Cost) are accessed from the script to format the message. All the work of serializing and deserializing the object is transparent to you, and you didn t have to do anything extra to introduce the new object into the proxies.
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As soon as the browser receives the response, the Microsoft Ajax runtime processes it and uses the client-side serializer (the Sys.Serialization.JavaScriptSerializer class) to deserialize the JSON sent by the server. The runtime then invokes the callback that you set to process the results. This lets you access and work with the result as an object, like the one defined on the server.
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Let s look at the output. Figure 5.4 demonstrates the results of your efforts up to now.
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Figure 5.4 A snapshot of what you ve built so far: calls to two Web Service methods, one that returns a simple type and another that returns a collection of a custom type
Working with ASP.NET Web Services
Figure 5.5 Using Firebug for Firefox, this snapshot shows the contents of what is being returned by the server.
If you insert a call to Sys.Debug.traceDump(result) from the callback function for the GetDeals method, you can use the Firebug tool to inspect what comes back from the server (see figure 5.5). More details about debugging and using tools such as Firebug and Web Developer Helper are provided in appendix B. We encourage you to become familiar with these tools and leverage them when you re authoring rich-client applications. Creating server types on the client The client is thrilled with your work so far, particularly the way the object you defined on the server can be used seamlessly in the browser as well. This prompts them to ask if it s possible to instantiate an instance of a server-side class from the client. Because the Beverage type is used in the service s GetDeals method, the client proxies already include a definition for it. This happens when the proxies are generated and the type is resolved by the Ajax runtime. Creating and initializing an instance of the Beverage type from JavaScript looks similar to how you would do this in .NET code:
var bev = new AspNetAjaxInAction.Beverage(); bev.Name = "Holiday Blend"; bev.Description = "A warm and spicy blend."; bev.Cost = "2.55";
Making asynchronous network calls
What about classes that aren t used in the Web Service In some cases, the client would like to use the same class they defined on the server, in the browser as well. It seems redundant to have to define the same object in JavaScript because it isn t used by the service. To demonstrate how you can resolve this situation, let s create another class on the server called Employee. For simplicity, this class also has three basic properties: first name, last name, and title. Listing 5.8 shows the implementation for the class.
Listing 5.8 The Employee class: another complex type defined on the server
using System; namespace AspNetAjaxInAction { public class Employee { public Employee() { } private string first; public string First { get { return this.first; } set { this.first = value; } } private string last; public string Last { get { return this.last; } set { this.last = value; } } private string title; public string Title { get { return this.title; } set { this.title = value; } } } }
The goal is to instantiate and update the object in JavaScript as you did with the Beverage object previously. Because the class hasn t been used in any method
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