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The examples in this chapter have concentrated exclusively on validating text entry, which is the most common requirement in a web application. While you can t validate RadioButton or CheckBox controls, you can validate most single-select list controls. When validating a list control, the value that is being validated is the Value property of the selected ListItem object. Remember, the Value property is the special hidden information attribute that can be added to every list item. If you don t use it, you can t validate the control (validating the text of the selection isn t a supported option).

Removing this plumbing code from the controller keeps the code clean and uncluttered and focused on business logic The last two beans defined in the springdispatch-servletxml file are specific to Spring MVC The urlMapping bean maps URLs matching /helloapp to the springController bean, which is an instance of the HelloWorldController class The viewResolver bean is a helper class that resolves views to servlets and JSPs located within the web application Note that this bean has a property named suffix that has a value of jsp In Listing 7-5, the controller creates a ModelAndView object, and the first parameter passed to the constructor is the string helloWorld, which is supposed to refer to the helloWorldjsp file Since the viewResolver bean automatically appends a jsp to the specified view names, we don t need to include the jsp in the view name.

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You can generate Excel spreadsheet documents which, incidentally, can also be opened in the OpenOffice.org spreadsheet application using the spreadsheet-excel gem. Install this gem by using the following command:

In more complex pages, you might have several distinct groups of controls, possibly in separate panels. In these situations, you may want to perform validation separately. For example, you might create a form that includes a box with login controls and a box underneath it with the controls for registering a new user. Each box includes its own submit button, and depending on which button is clicked, you want to perform the validation just for that section of the page. This scenario is possible thanks to a feature called validation groups. To create a validation group, you need to put the input controls, the validators, and the CausesValidation button controls into the same logical group. You do this by setting the ValidationGroup property of every control with the same descriptive string (such as LoginGroup or NewUserGroup ). Every control that provides a CausesValidation property also includes the ValidationGroup property. For example, the following page defines two validation groups, named Group1 and Group2. The controls for each group are placed into separate Panel controls. <form id="form1" runat="server"> <asp:Panel ID="Panel1" runat="server"> <asp:TextBox ID="TextBox1" ValidationGroup="Group1" runat="server" /> <asp:RequiredFieldValidator ID="RequiredFieldValidator1"

Each state management choice has a different lifetime, scope, performance overhead, and level of support. Table 7-3 and Table 7-4 show an at-a-glance comparison of your state management options. Table 7-3. State Management Options Compared (Part 1)

Allowed Data Types Storage Location All serializable .NET data types. A hidden field in the current web page.

method described in that chapter is a bit of a hack, and you get less control over your output formatting, but it s extremely easy to implement. The method shown in this chapter offers greater control, such as the ability to arrange your Excel document into multiple sheets.

The result of all of this is the web page shown in Figure 7-1 OK, that s not bad for a Hello World application, but is that all there is to it.

String data. The client s computer (in memory or a small text file, depending on its lifetime settings). Set by the programmer. Can be used in multiple pages and can persist between visits. The whole ASP.NET application. Insecure, and can be modified by the user.

Lost when the user enters a new URL or closes the browser. However, this can be stored in a bookmark. Limited to the target page. Clearly visible and easy for the user to modify.

The following code creates a spreadsheet with Hello, world! in the upper-left corner:

Limited to the current page. Tamperproof by default but easy to read. You can enforce encryption by using the ViewStateEncryptionMode property of the Page directive. Slow if a large amount of information is stored, but will not affect server performance. Page-specific settings.

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