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We ll guide you step by step through the creation of a client behavior that is able to programmatically change the CSS class associated with a DOM element in response to its events. The following example focuses on a specific scenario: the emulation of the in-place edit functionality. Allow input wherever you have output is one of the axioms of Alan Cooper, a famous advocate of UI design. Following his axiom, you ll implement a form where the input fields are styled as labels. When the user hovers over a text box, its style changes to visually suggest that a text field is present and it effectively appears as soon as the user gives focus to the text box. When the user tabs away from the text box or clicks outside it, the text box will be styled to again look like a label. This kind of functionality is called in-place editing, and it can enhance the appearance and usability of a web form. If you re unsure about the final result, figure 8.9 shows the example up and running. Let s open Visual Studio and start writing some code. Based on what you ve learned in the previous sections, your mission is to encapsulate the client logic into a behavior. In the Figure 8.9 The FormattingBehavior class s prototype, you handle the behavior s lets you implement the in-place-edit functionality in a web form. By using CSS, lifecycle as well as the events raised by the you can simulate a visual effect that turns associated DOM element. The complete code a label into a text field. for the FormattingBehavior behavior is shown in listing 8.6.

The Add() methods are pretty straightforward: Friend Sub Add(ByVal rule As IAsyncRuleMethod, ByVal result As AsyncRuleResult) Remove(rule) IsReadOnly = False Dim item As New BrokenRule(rule, result) IncrementCount(item) Add(item) IsReadOnly = True End Sub Friend Sub Add(ByVal rule As IRuleMethod) Remove(rule) IsReadOnly = False Dim item As New BrokenRule(rule) IncrementCount(item) Add(item) IsReadOnly = True End Sub Both overloads do essentially the same thing, but for asynchronous and synchronous rule methods To avoid possible duplicate object issues, they first ensure that the broken rule isn t already in the list by calling the Remove() method Then they change the collection to be read-write, add the rule to the collection, and set the collection back to be read-only Although they could just see whether the collection contains the broken rule, removing and re-adding the rule is better, because it ensures that the human-readable description for the rule is current.

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code provides a username and password, which can be validated using the PTPrincipal class in the ProjectTracker.Library just like in the Windows Forms and Web Forms interfaces. The harder question is how to get the username and password from the consumer, and there are two basic approaches to an answer. The first of these is to have each web method include username and password parameters. Each time the consumer calls a web method, it would need to provide values for these two parameters (along with any other parameters the method requires). Within the web method, those two parameters could be passed to PTPrincipal.Login() to see if the credentials are valid. Although this can work, it pollutes the parameter lists of all the web methods. Each method ends up with these two extra parameters that really have nothing to do with the method itself. This is far from ideal. The other approach is to use the SOAP header to pass the information from consumer to server outside the context of the method, but as part of the same exchange of data. In other words, the username and password information will piggyback on the method call, but won t be part of the method call.

The endRequest event Finally, if everything goes smoothly, the endRequest event is raised by the PageRequestManager after the load event. This event indicates that the processing for the request has completed. We chose our words carefully when we said if everything goes smoothly ; this event is also raised when an error is thrown during the postback processing. If an error occurs, details about the error are passed along with the event arguments, allowing you to handle the error yourself or let it be dealt with elsewhere in the page. We ll spend more time on error handling later in the chapter. You can rely on the fact that the endRequest event will always be raised at the end of a partial postback. You should now have a high-level understanding of the client-side event model offered by the PageRequestManager. If the previous overview wasn t thorough enough, have no fear we ve only just begun to explore how the model behaves. Soon, we ll provide more insight into what is happening behind the scenes and how to program against it effectively.

The rule method could have changed the description over time The IncrementCount() method is used to maintain counters for the number of Error, Warning, and Information severity rules that are broken Each broken rule has one of these severities, and as an optimization, BrokenRulesCollection maintains a running count of the number of each severity that is broken at any point in time The Remove() method is a bit more complex: Friend Sub Remove(ByVal rule As IRuleMethod) IsReadOnly = False For index As Integer = 0 To Count - 1 If Me(index)RuleName = ruleRuleName Then DecrementCount(Me(index)) RemoveAt(index) Exit For End If.

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Tip Two references to the same object can have different types. See the section on polymorphism in 6.

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