Custom Validation | in Visual Studio .NET

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Custom Validation |
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Protected Sub ServerValidator(ByVal source As Object, _ ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) _ Handles CustomValidator1.ServerValidate args.IsValid = False Dim evenNumber As Integer = Int32.Parse(args.Value) If evenNumber Mod 2 = 0 Then args.IsValid = True End If End Sub
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This method does the same thing as the client-side validator, only in VB rather than in JavaScript. There are a few things to notice about these methods. First, the value that the CustomValidator is examining is passed to your routine as the Value property of the ServerValidateEventArgs event argument. You convert that string to an int using the Base Class Library Int32 object s static Parse method, as shown. The declaration for the CustomValidator in the content file sets the client-side method and the server-side method you ve designated.
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<asp:CustomValidator runat="server" ID="CustomValidator1" ControlToValidate="txtValue" ValidateEmptyText=false ClientValidationFunction="ClientValidator" OnServerValidate="ServerValidator"> Please enter an even number </asp:CustomValidator>
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If you run this program in a current browser and enter an odd number, the page will never be posted back to the server; the JavaScript handles the validation on the browser. If you enter an even number, however, the client-side script and the serverside script will run (to protect against spoofing from the client).
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Summary
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Users will enter improperly formatted data into your forms, but validation can allow the controls to check that data before it s accepted by your server. ASP.NET provides validation controls that can check for a number of common user errors. Current browsers can validate input on the client side, eliminating a round trip to the server. The RequiredFieldValidator simply checks that the user has made a choice in the specified control. On TextBoxes and DropDownLists, this validator can also make certain that the user has selected an item other than the initial value.
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5: Validation
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If you set the SetFocusOnError property to true, the focus is automatically placed on the control that fails validation, making it easier for the user to find. You can use the ValidationSummary control to provide detailed feedback to the user in a single spot on your page. You can still mark the individual controls that failed validation, but you don t need to put a lengthy error message next to the control. With the CompareValidator control, you can check the user s input against a constant value, a database value, or the value of another control. You can check if the input is greater than, less than, or equal to the specified value, or you can simply check that the input is of the desired data type. The RangeValidator control checks to see if the user s input falls within an appropriate range. You can specify the maximum and minimum values of the range. Regular expressions are a language that uses literals and metacharacters to describe and search text strings. With the RegularExpressionValidator, you can check that the user s input meets the expected pattern for data such as a phone number, a zip code, an email address, or other variations. The Regular Expression Editor provides some common regular expressions, or you can provide your own. If none of the existing controls provides the validation you need, you can use a CustomValidator to add custom JavaScript code to evaluate the user s input. Your custom code can do anything you like, but it can only return true or false. You ve created a lot of pages so far, and most of them have had familiar elements that you see as you browse the web every day form controls, database access, and postbacks, among others. What you have not done so far, though, is create a page that looks like something you d see on the Web. For that, you need style, and we don t just mean good fashion sense. In the next chapter, you ll learn how to provide a uniform, professional look to all your pages, and how to include special touches, such as navigation tools, that separate a quality web site from just a collection of controls.
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