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very time you need a new form for user input, you usually have to write a new ActionForm subclass. This can get tedious quickly, especially if your form has many getter and setter functions. (I hope you had a taste of how bad it can get in Lab 6, where you had to implement ContactActionForm, with 14 getters and setters.) In previous chapters, I ve shown you how to alleviate these problems a little by reusing forms (Lab 9a) or by using nested properties (Lab 10a) to avoid writing superfluous getter and setter functions in your ActionForm subclasses. But these get you only so far. Dynamic forms, the subject of this chapter, are a way to eliminate writing Java code entirely. Instead, you declare additional XML in struts-config.xml for each form you want to create. The XML involved is an extension to the usual <form-bean> declaration you re familiar with: you add <form-property> tags for each property in the form. Like everything else in life, there are advantages as well as disadvantages to using dynamic forms. The primary advantage is, of course, that you don t have to declare getters and setters for your form. This can be quite a big plus if your application requires a lot of forms. However, as you ll see later, dynamic forms also have a number of important shortcomings. Toward the end of this chapter, we ll also look at a couple of recent additions to Struts (since Struts 1.2.6) that take the dynamic forms idea to the extreme. Using LazyValidatorForm, you don t even have to declare the properties in your forms! We won t be done with dynamic forms in this chapter. In 19, I ll show you how to implement a plug-in that makes interesting extensions to dynamic forms.

For the letter Z, the data in the array is B00011111 B00000001 B00000010 B00000100 B00001000 B00010000 B00010000 B00011111 which corresponds with the LED bit pattern of

To create a dynamic form, you need only to declare it in your struts-config.xml file. Declaring a dynamic form is easy: in your <form-bean> declaration of the form, put in extra <form-property> tags for each property on the form. You can declare simple, indexed, mapped, or nested properties this way (see 10). Listing 16-1 shows how you might declare a form bean with a simple (String), indexed (array), and mapped property (using a HashMap).

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Why do bad things happen to seemingly well-run companies How do you prevent them from happening These questions were largely the impetus behind the creation of the Compliance and Risk Committee by our Board. We did not have, and most Boards do not have, a committee that focuses primarily on enterprise risk management. Let s focus on two of the Compliance and Risk Committee s main responsibilities. The first is to give order, discipline, and thought to how we process information that has to do with risk. How does the Board establish a risk appetite as it relates to the company s strategy, business operations, financial reporting, and legal and regulatory affairs How do we decide which

To read the bit pattern, you need to access the font, which is stored in program space and not SRAM as normal. To do this, you need to make use of one of the utilities from the pgmspace library, pgm_read_byte. firstChrRow = pgm_read_byte(&font[Char1 - 32][y]); secondChrRow = (pgm_read_byte(&font[Char2 - 32][y])) << 1; When you access program space, you are obtaining data held in the flash memory. To do so, you need to know the address in memory where the data is stored (each storage location in memory has a unique address number).

<form-bean name="MyFormBean" type="org.apache.struts.action.DynaActionForm"> <!-- declaring a simple property --> <form-property name="MySimpleProp" type="java.lang.String" initial="Hello" /> <!-- declaring another simple property --> <form-property name="MySimpleIntProp" type="int" /> <!-- declaring an indexed property --> <form-property name="MyIndexedProp" type="java.lang.String[]" size="314" /> <!-- declaring a mapped property --> <form-property name="MyMappedProp" type="java.util.HashMap" /> <!-- declaring a nested property --> <form-property name="MyNestedProp" type="com.myco.myapp.MyBean" /> </form-bean> The first thing to note is that the type attribute must be either org.apache.struts. action.DynaActionForm (itself a subclass of ActionForm) or your subclass of DynaActionForm. To put it another way, Struts disregards a <form-bean> s <form-property> tags unless the ActionForm subclass indicated by the type attribute is also a subclass of DynaActionForm. For Struts versions later than 1.2.6, this is not strictly true. See the note for details.

Note In versions of Struts later than 1.2.6, if the class indicated by the type attribute is of type

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