4: Advanced Controls and Customization in .NET framework

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Figure 418: Employment application form with Choice Group control
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can click the Choice Section icon on the left of the control and replace the current Choice Section with the second one, as shown in Figure 419 (Note that group7 and group8 are the names of the data items in the data source to which the Choice Sections are connected Later in this chapter, we ll show
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Figure 419: Default Choice Section with context menu commands
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you how to change those names to something more descriptive) Figure 420 shows this part of the form after replacing the default Choice Section with the second one, which allows the user to insert a URL for his or her r sum
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Figure 420: Employment application form after replacing the default Choice Section
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The Repeating Choice Group control is not much different than the Choice Group control The main difference is that, like the Repeating Section control, you can insert multiple Choice Sections of a particular type For example, let s say that you want to allow the user of your form to not only
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attach a le but also supply a URL If you want to support this scenario when users ll out your form, you should use the Repeating Choice Group control This control is really like a combination of the Choice Group and Repeating Section When a user lls out a form that contains this control, he or she can insert multiple instances of one type of Choice Section (eg, multiple r sum les) or replace one Choice Section with another (eg, if the user decides to include a URL instead of a r sum le)
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Repeating Recursive Section
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Recursive controls are not supported in browser-enabled forms
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The Repeating Recursive Section is, by far, the most complicated control in terms of the type of data structure to which it is bound This control allows you to insert multiple instances of the same data structure within the current Recursive Section control when lling out a form Whenever you have multiple instances of the same data structure within each other, this is referred to as recursion For example, let s say that you are a manager and you want to design a form in which you can store all information about your employees (eg, name, employee number, title, and so on) Some of your employees may be managers, so you want to store information about their reports as well Since a manager is an employee and the people on his or her team are also employees, the data is recursive It makes sense to use a Repeating Recursive Section for this form (In 3, we showed the schema for a Repeating Recursive Section; see Table 39) Look at Figure 421, which shows the employee information form with a Repeating Recursive Section (We ve added a border to this control to make the hierarchy more pronounced when lling out the form This form is in EmployeeInformation with the samples for this chapter) As you can see, the Repeating Recursive Section is basically a Repeating Section that can contain other controls In fact, we ve added a layout table and
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4: Advanced Controls and Customization
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Figure 421: Repeating Recursive Section in design mode
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some controls to the Repeating Section so that employees can enter their employee information However, one difference between the Repeating Section and the Repeating Recursive Section is the existence of an inner Repeating Section that looks sort of strange This inner Repeating Section is sort of gray with the text user can insert this section within itself This strange-looking Repeating Section is called the Recursive Section In design mode, this section simply indicates that this control is recursive Anything you place within the outer Repeating Section will be duplicated within it at least once If you remove the inner Recursive Section, the Repeating Recursive Section control is no longer recursive To see this control in action, look at Figure 422, which shows how the Repeating Recursive Section looks when a user lls out the form From the form, you can see that John Smith is a Development Manager Jane Doe is a Software Development Lead who reports to John Smith Joe Bob is a Software Development Engineer who reports to Jane Doe The Repeating Recursive Section allows you to create hierarchies of similar data structures very easily The example shown in Figure 422 is very simple, however The Repeating Recursive Section allows you to insert multiple instances of the data at any level So, you could insert many other employees at John s, Jane s, or Joe s levels
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