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The previous example demonstrated the Atlas version of the client callback model. Although it has the same plumbing as the ASP.NET client callback feature, the Atlas version provides a stronger foundation that s built on web services. However, both approaches have one feature in common. No matter which technique you use, you still need to write your own JavaScript.

Figure 4-4. A dynamically generated table This example used a table because it gave a good opportunity to show how child controls (cells and rows) are added to the Controls collection of the parent, but of course this mechanism works with any other server control.

The DataView allows for some surprisingly complex filter expressions. One of its little-known features is the ability to filter rows based on relationships. For example, you could display categories that contain more than 20 products, or you could display customers who have made a certain number of total purchases. In both of these examples, you need to filter one table based on the information in a related table. To create this sort of filter string, you need to combine two ingredients: A table relationship that links two tables. An aggregate function such as AVG(), MAX(), MIN(), or COUNT(). This function acts on the data in the related records.

This won t always be the case. As you ll see throughout this chapter, Atlas has the ability to generate JavaScript code for a wide range of scenarios. But to tell Atlas what script to generate, you need to master a new standard called Atlas script.

HTML server controls provide a sparse event model with two possible events: ServerClick and ServerChange. The ServerClick is simply a click that is processed on the server side. It s provided by most button controls, and it allows your code to take immediate action. This action might override the expected behavior. For example, if you intercept the click event of a hyperlink control (the <a> element), the user won t be redirected to a new page unless you provide extra code to forward the request. The ServerChange event responds when a change has been made to a text or selection control. This event doesn t occur until the page is posted back (for example, after the user clicks a submit button). At this point, the ServerChange event occurs for all changed controls, followed by the appropriate ServerClick. Table 4-7 shows which controls provide a ServerClick event and which ones provide a ServerChange event. Table 4-7. HTML Control Events

var response = xmlRequest.responseText; if (response == "-") { lbl.innerHTML = "You've entered invalid numbers."; } else { var responseStrings = response.split(","); lbl.innerHTML = "The server returned the sum: " + responseStrings[0] + " at " + responseStrings[1]; } } }

All the web controls inherit from the WebControl class. The WebControl class also derives from Control. As a result, many of its properties and methods such as Controls, Visible, and FindControl() are similar to those of the HTML server controls. However, the WebControl class adds the properties shown in Table 4-8. Many of these properties wrap the CSS style attributes, such as the foreground or background color, the font, the height, the width, and so on. These properties allow you to configure the appearance of a web control much more easily (and with less chance of error). Table 4-8. WebControl Class Properties

HtmlAnchor, HtmlForm, HtmlButton, HtmlInputButton, HtmlInputImage HtmlInputText, HtmlInputCheckBox, HtmlInputRadioButton, HtmlInputHidden, HtmlSelect, HtmlTextArea

It s worth pointing out that Ajax doesn t save you from any server round-trips, and it rarely reduces the server processing time. The real difference is that round-trips occur silently in the background, which gives the application a more responsive feel.