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This text won t try to be a complete tutorial on Spring. Such a tutorial can (and has) filled a complete book itself, like Pro Spring by Rob Harrop (Apress, 2005). Here, you ll see a simple Hello World example that demonstrates how to get Spring up and running in a web environment so we can build on it in future examples. This example uses both Spring and Spring MVC. Spring MVC is, as its name suggests, a web model-view-controller framework, not unlike Struts. Spring MVC is conceptually similar to Struts but is designed to avoid many of the pitfalls associated with Struts. For example, a Spring MVC Controller is conceptually similar to a Struts Action, but unlike a Struts Action, a Spring MVC Controller is not required to extend a particular abstract class. Figure 7-1 shows the Hello World page this example will create. You can see that in addition to printing the static Hello World text, the application also writes the current date string to the page in addition to printing the results of a simple iteration.

Figure 10-3. A validation summary and an error indicator The ValidationSummary control provides some useful properties you can use to fine-tune the error display. You can set the HeaderText property to display a special title at the top of the list (such as Your page contains the following errors:). You can also change the ForeColor and choose a DisplayMode. The possible modes are BulletList (the default), List, and SingleParagraph. Finally, you can choose to have the validation summary displayed in a pop-up dialog box instead of on the page (see Figure 10-3). This approach has the advantage of leaving the user interface of the page untouched, but it also forces the user to dismiss the error messages by closing the window before being able to modify the input controls. If users will need to refer to these messages while they fix the page, the inline display is better.

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It should present you with a file open dialog box similar to Figure 12-3. Select the training.mdb database, and you ll get a message box notifiying you how many records were imported.

To show the summary in a dialog box, set the ShowMessageBox property of the ValidationSummary to true. Keep in mind that unless you set the ShowSummary property to false, you ll see both the message box and the in-page summary (as in Figure 10-4).

Your final option is to disable validation and perform the work on your own, with the help of the validation controls. This allows you to take other information into consideration or create a specialized error message that involves other controls (such as images or buttons). You can create manual validation in one of three ways: Use your own code to verify values. In this case, you won t use any of the ASP .NET validation controls. Disable the EnableClientScript property for each validation control. This allows an invalid page to be submitted, after which you can decide what to do with it depending on the problems that may exist. Add a button with CausesValidation set to false. When this button is clicked, manually validate the page by calling the Page.Validate() method. Then examine the IsValid property, and decide what to do. The next example uses the second approach. Once the page is submitted, it examines all the validation controls on the page by looping through the Page.Validators collection. Every time it finds a control that hasn t validated successfully, it retrieves the invalid value from the input control and adds it to a string. At the end of this routine, it displays a message that describes which values were incorrect, as shown in Figure 10-5.

s You can also pass this script an argument on the command line. Users may like dialog boxes, but Tip

We ll start from the top and work our way down. The JSP that produces this page is, as you likely expect, rather simple and is shown in Listing 7-1.

Figure 10-5. Manual validation This technique adds a feature that wouldn t be available with automatic validation, which uses the ErrorMessage property. In that case, it isn t possible to include the actual incorrect values in the message. Here s the event handler that checks for invalid values: protected void cmdOK_Click(Object sender, EventArgs e) { string errorMessage = "<b>Mistakes found:</b><br />"; // Search through the validation controls. foreach (BaseValidator ctrl in this.Validators) { if (!ctrl.IsValid) { errorMessage += ctrl.ErrorMessage + "<br />"; // Find the corresponding input control, and change the // generic Control variable into a TextBox variable. // This allows access to the Text property. TextBox ctrlInput = (TextBox)this.FindControl(ctrl.ControlToValidate); errorMessage += " * Problem is with this input: "; errorMessage += ctrlInput.Text + "<br />"; } } lblMessage.Text = errorMessage; }

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