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CHAPTER 2 s ATLAS: TAKING AJAX TO THE NEXT LEVEL
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Figure 2-1. Adding a calendar to the default form
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Figure 2-2. Inspecting the server-side code behind the calendar page
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CHAPTER 2 s ATLAS: TAKING AJAX TO THE NEXT LEVEL
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The workhorse line is this one: <asp:Calendar ID="Calendar1" runat="Server"></asp:Calendar> At runtime, the ASP .NET engine takes this and uses its built-in Calendar control to generate the HTML. Similarly, VS .NET uses the Calendar control within ASP.NET to create the visual representation within the integrated development environment (IDE). This HTML looks vastly different from what you saw in Figure 2-2, because it is the output of the rendering of the server control as HTML. Figure 2-3 shows the page being rendered in Internet Explorer.
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Figure 2-3. Viewing the calendar page in a browser
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Using the Browser s View Source functionality, you can inspect the HTML and JavaScript (see Figure 2-4). You can see that it is vastly different from what was shown at design time in Figure 2-2. The <asp:Calendar> control has been replaced by an HTML <div> containing all the layout and information for the calendar; showing the days, dates, and month; and showing the JavaScript that handles the links to move forward and backward by month. This is an example of the power of server-side controls, and it is with controls such as these that you will be able to deliver Ajax functionality to the browser without going through overly complex hand-coding, as demonstrated in 1. You will also be able to take advantage of using a professional IDE so that you can debug and manage your Atlas pages as easily as standard web forms or Windows applications. This has been one of the premier design goals of Atlas. It is well understood that creating Ajax-based web applications can be complex and requires extensive knowledge of client-side script, which is slow to develop and debug. It is here where Microsoft is diverging its development of an Ajax API, which allows developers to continue using the great productivity characteristics that they are used to using in Visual Studio to build web applications for greater user flexibility.
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CHAPTER 2 s ATLAS: TAKING AJAX TO THE NEXT LEVEL
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Figure 2-4. Viewing the client-side code behind the calendar page
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Atlas extends the Ajax concept in two significant ways. First, it encapsulates much of the commonly used JavaScript into client script libraries that simplify the task of creating rich user interfaces (UIs) and remote procedure calls as well as provides you with true objectoriented APIs that you can use in a JavaScript environment. You can use these libraries as they are to enhance web sites built on any platform via Ajax-style techniques. You ll be looking at these in more detail in 3. This client-side framework also introduces a new methodology for building your client-side applications a declarative XML-based markup called Atlas Script. Using this script, you map XML elements to underlying HTML ones. These XML elements can then be attributed, or have behaviors and actions associated with them, using child tags. The Atlas runtime will then parse this script and generate the appropriate runtime behavior. Second, Atlas provides a server development platform, which is integrated with ASP .NET .NET 2.0, Atlas provides a programming model that makes it simple to 2.0. When used with ASP create rich Ajax user experiences on the Web, and it allows you to easily extend your existing ASP.NET applications to provide this functionality. This is the most important part of the server-side aspect of Atlas. It allows you to wrap your existing applications with server controls called UpdatePanels that empower that part of your page to be updated asynchronously and without a complete-page refresh. This is extremely important because it allows you to .NET web applications into Ajax applications with asynchronous, turn your existing ASP partial-page updates!
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CHAPTER 2 s ATLAS: TAKING AJAX TO THE NEXT LEVEL
Introducing the Atlas Architecture
The Atlas architecture consists of two major pieces. First is the Atlas client script library, which makes it more productive for you to build the client-side functionality of your web applications. It has a rich component model and allows for object-oriented scripting. It provides many classes that add value to your applications, including network access, user interface enhancements, behaviors, actions, string manipulation, and more. It also provides an XML-based scripting platform with which you can declaratively put together client-side behavior. You can use it to map actions, behaviors, and data-binding functionality to your applications. Because it is based on XML and is declarative, it will provide the future basis for visual tools to generate Ajax UIs for Atlas. Second is the set of server extensions; these extensions allow you to integrate the applica.NET applications and tion model between the client and the server. You can use existing ASP target the Atlas runtime on the client. You can see this architecture in Figure 2-5.
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