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private bool CustNameRequired(object target, RuleArgs e) { If (string.IsNullOrEmpty(((Customer)target).Name) { e.Description = "Customer name required"; return false; } else return true; } If the length of the target object s Name property is zero, then the rule is not satisfied, so it returns false. It also sets the Description property of the RuleArgs object to a human-readable description of why the rule is broken. This illustrates a rule that would be implemented within a single business class. By using reflection, it is possible to write entirely reusable rule methods that can be used by any business class. You ll see some examples of this in the Common Business Rules section of 5 when I discuss the CommonRules class.

What have you learned by developing this application It s clear that building interfaces based on controls requires a significant amount of code to configure controls by setting their properties. The layout of a form is also set by defining properties of controls, as you did in your browser. Moreover, there is an ever-increasing list of available controls, and each provides a large number of properties.

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The RuleHandler delegate specifies the use of the RuleArgs object as a parameter to every rule method. This follows the general pattern used throughout .NET of passing an EventArgs parameter to all event handlers. Business rules aren t event handlers, so RuleArgs doesn t inherit from EventArgs, but it follows the same basic principal: public class RuleArgs { private string _propertyName; private string _description; public string PropertyName { get { return _propertyName; } } public string Description { get { return _description; } set { _description = value; } } public RuleArgs(string propertyName) { _propertyName = propertyName; } public override string ToString() { return _propertyName; } } The goal is to be able to pass data into and out of the rule method in a clearly defined manner. At a minimum, RuleArgs passes the name of the property to be validated into the rule method, and passes back any broken rule description out of the rule method. To do this, it simply contains a readonly PropertyName property and a read-write Description property.

Most of the DOM methods you ve seen so far are useful for identifying elements. Both getElementById and getElementsByTagName allow you to quickly and easily target specific element nodes in a document. These elements can then be manipulated using methods and properties like setAttribute (to change the value of an attribute) or nodeValue (to change the text contained by an element node). That s how the image gallery works. The showPic function identifies two elements, with the IDs "placeholder" and "description", and then updates their contents. The src attribute of the "placeholder" element is changed using setAttribute. The text within "description" is changed using nodeValue. In both cases, changes are being made to elements that already exist. This is the way that the majority of JavaScript functions work. The structure of the web page is created with markup. JavaScript is then used to change some of the details without altering the underlying structure. It is also possible to use JavaScript to change the structure and contents of a web page. In this chapter, you ll learn about some DOM methods that can alter the structure of a web page by creating new elements and modifying existing ones.

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