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<script language="C#" runat=server> void Validate_Click(Object sender, EventArgs E) { if ( Page.IsValid ) { Msg.Text="Page Valid"; } }
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void CustomServerVal (object source, ServerValidateEventArgs args) { try { if ( args.Value.Equals("Hello") ) { Msg.Text="ServerValidation called and TRUE returned."; args.IsValid=true; } else { Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; } } catch { Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; } }
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</script> <body> <form runat=server> <center> <h3> <font face="Verdana" color=blue>Validator Test Page</font> </h3> <table> <tr> <td> Range Validation (1-12): </td> <td> <input id="Range" type="text" runat=server size=10 /> </td> <td> <ASP:RangeValidator ID="ValRange" ControlToValidate="Range" Display="Static" Type="Integer" MinimumValue="1" MaximumValue="12" ErrorMessage="Out of Range" runat=server /> </td> </tr> <tr> <td>
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Regular Expression Validation (nnn-nn-nnnn): </td> <td> <input id="RegEx" type="text" runat=server size=11 /> </td> <td> <ASP:RegularExpressionValidator ID="ValRegEx" ControlToValidate="RegEx" runat="SERVER" ErrorMessage= "Enter a valid U.S. SSN (nnn-nn-nnnn)." ValidationExpression= "[0-9]{3}-[ 0-9]{2}-[0-9]{4}" /> </td> </tr> <tr> <td> Custom Validation (It wants you to enter "Hello" WITHOUT THE QUOTES): </td> <td> <input type="text" id="txtCustom" runat=server size=11 /> </td> <td> <ASP:CustomValidator ID="ValCustom"
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runat="server" ControlToValidate="txtCustom" OnServerValidate="CustomServerVal" Display="Static" > Enter "Hello". Case-Sensitive. </ASP:CustomValidator> </td> </tr> <tr> <td colspan=3 align="center"> <asp:button text="Validate" OnClick="Validate_Click" runat=server> </asp:button> <p> <asp:Label id="Msg" ForeColor="red" Font-Name="Verdana" Font-Size="10" runat=server /> </td> </tr> </table> </center> </form> </body> </html>
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Figure 5-7 shows ValidatorTest.aspx when displayed in a browser.
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Figure 5-7 : ValidatorTest.aspx, which uses the RangeValidator, RegularExpressionValidator, and CustomValidator controls The RangeValidator control has several attributes that are unique to this type of validator. In Listing 5-4, the code that declares RangeValidator is as follows: <ASP:RangeValidator ID="ValRange" ControlToValidate="Range" Display="Static" Type="Integer" MinimumValue="1" MaximumValue="12" ErrorMessage="Out of Range" runat=server /> Three of the attributes used here are already familiar (ControlToValidate, Type, and RunAt), one has been shown previously but not explained (Display, to be described in the next section), and a couple are new (MinimumValue and MaximumValue). Type is the type of comparison that should be done. For example, consider whether 1234 is greater than 13. If these are string values, 1234 is alphabetically smaller, but if these are numeric values, 1234 is numerically greater. The values allowed for Type in RangeValidator are the same as are allowed for a CompareValidator control s Type attribute. MinimumValue and MaximumValue are compared to the value of ControlToValidate, using the type conversion specified by the Type attribute. In this example, we re looking for an integer from 1 through 12. RegularExpressionValidator is useful because of its flexibility. The code used to specify RegularExpressionValidator in Listing 5-4 is shown here: <ASP:RegularExpressionValidator ID="ValRegEx" ControlToValidate="RegEx" runat="SERVER" ErrorMessage="Enter a valid U.S. SSN (nnn-nn-nnnn)." ValidationExpression="[0-9]{3}-[ 0-9]{2}-[0-9]{4}" /> The unique attribute in the code to create this validator is ValidationExpression. The value of this attribute is a regular expression pattern to match against the value of the control specified in ControlToValidate. If you re unfamiliar with regular expressions in general, refer to the following Regular Expressions sidebar.
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Regular Expressions Regular expressions are strings used to match patterns of text. Why is matching patterns of text so much more useful than just comparing against a string or against another control (as the CompareValidator control does) Think about the kind of things you validate. Often you re validating input such as telephone numbers, ZIP Codes, and social security numbers. The CompareValidator control is of no value in these situations. The simplest kind of regular expression that virtually all computer users were familiar with when the command line was king was a file name with a wildcard. Want to see all the .doc files in a folder From the command prompt, you would type the following: Dir *.doc This command would result in a list of all files with the .doc extension. Or you might want to look for a file named either TEST0501.DOC or TEST0601.DOC. To do so, you would type the following: Dir TEST0 01.DOC SQL programmers are also used to a form of regular expressions that can be used with the LIKE keyword, as shown here: SELECT * FROM Users WHERE LastName LIKE R__lly This statement would show a list of users with the last name Reilly, or even Rielly, a common misspelling. It would not show a name like Rilly because in this case, the underscore (_) is used as a single-character placeholder, and so two underscores could take the place of exactly two characters. Regular expressions in .NET are much more powerful, and a complete description is beyond the scope of this book, so here we ll look only at the regular expression I m using in the RegularExpressionValidator example in ValidatorTest.aspx, shown in Listing 5-4. The regular expression [0-9]{3}-[0-9]{2}-[0-9]{4} is one of many ways you can validate for a plausible U.S. social security number, which must be in the form nnn-nn-nnnn, where the ns each represent a single digit. Characters within square brackets ([ and ]) can be either a list of characters or a range of characters. In each of the instances of square brackets in this example, the characters allowed are represented by a range of characters from 0 through 9. Following each of the sets of characters in square brackets is a number in curly braces ({ and }). The value within the curly braces specifies the number of characters matching the previous expression that must be present. The hyphens (-) outside the brackets and braces represent literal characters that must be present. This example could have been satisfied just as easily in several different ways, as in the following examples: [0123456789]{3}-[0123456789]{2}-[0123456789]{4} \d{3}-\d{2}=\d{4} In the first alternative, I ve simply listed the digits individually within the square brackets. In the second alternative, I ve used a shortcut to specify digits, \d, and followed it with the count in curly braces. There are lots of other shortcuts. In addition to specifying the characters allowed, you can precede the character set within the square brackets with a caret (^) to indicate characters not allowed. Thus, the following string would match seven non-numeric characters. [^0 -9]{7}
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This brief introduction is by no means complete. You can refer to the MSDN documentation for more information.
With the RequiredFieldValidator, CompareValidator, RangeValidator, and RegularExpressionValidator controls, most of your validation needs are met. These validators can handle many different types of fields. But suppose you needed something a little different That s where CustomValidator comes in. The CustomValidator control can be used whenever the other stock validators don t do the job. For example, if instead of just comparing a value against a fixed value or a regular expression you want to validate the value entered against a database, CustomValidator is one way to go. The code used to specify CustomValidator in ValidatorTest.aspx in Listing 5-4 is shown here: <ASP:CustomValidator ID="ValCustom" runat="server" ControlToValidate="txtCustom" OnServerValidate="CustomServerVal" Display="Static" > Enter "Hello". Case-Sensitive. </ASP:CustomValidator> One thing that stands out in this example in comparison with previous example validators is that rather than using a single tag to open and close the validator and specifying the error message as an attribute (the ErrorMessage attribute), here I enter the error message I want associated with the validator between the start and end tags. There s no practical difference between the two methods of specifying the error message. A new attribute is included with CustomValidator in this example, OnServerValidate. This attribute points to a server-side function that takes two parameters in this example, the function CustomServerVal, shown here: void CustomServerVal (object source, ServerValidateEventArgs args) { try { if ( args.Value.Equals("Hello") ) { Msg.Text="ServerValidation called and TRUE returned."; args.IsValid=true; } else { Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; } } catch {
Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; } } ServerValidateEventArgs has two properties that are important for this example: Value and IsValid. Value is used to get the value of the control, useful for performing the custom validation that s the goal of CustomServerVal. Value is a read-only property. The CustomServerVal function does nothing more than perform a simple comparison between the value and the literal string Hello . If Value equals Hello and no exception is thrown during the check, the function sets the IsValid property of the ServerValidateEventArgs instance to true. If IsValid is set to false, the CustomValidator control will fire, displaying the error message specified either in the ErrorMessage attribute or between the start and end tags of the CustomValidator control. As with the other validators, CustomValidator can also perform some of its checking on the client side. The ClientValidationFunction attribute allows you to specify which function on the client side should be used to validate the control pointed to by the ControlToValidate attribute. This example contains no client-side validation, but a reasonable implementation would be as follows: <script language="javascript"> function ClientValidate(source, value) { if (value == "Hello") return true; else return false; } </script> The important thing to recognize about the client-side validation is that you ll almost certainly be using a different language than you use to code the server-side validator function. This can lead to interesting problems. For instance, in this simple example, is the comparison of the string Hello case sensitive on both the client side and the server side Ensuring the same case sensitivity would require knowledge of each of the languages involved. Multiple Validators on a Single Field Loading the ValidatorTest.aspx page from Listing 5-4 and clicking Validate displays the page shown in Figure 5-8.
Figure 5-8 : The page that results from clicking the Validate button with no values filled in Notice that it displays the message Page Valid . This is almost certainly not what you wanted! You specified that the first field should be a number between 1 and 12, that the
second field should be some string that looks like a social security number, and that the last field should be Hello . But it turns out that, by design, all validators except RequiredFieldValidator don t validate against an empty control. There must be a solution. One solution is to use the RequiredFieldValidator control. Listing 5-5 shows a modified version of ValidatorTest.aspx, named ValidatorTestRequired.aspx. The difference between ValidatorTest.aspx (which is shown in Listing 5-4) and ValidatorTestRequired.aspx is the addition of a RequiredFieldValidator control for each of the fields covered by another validator. Listing 5-5 ValidatorTestRequired.aspx, a page that requires all fields to be filled, with valid data
<html> <script language="C#" runat=server> void Validate_Click(Object sender, EventArgs E) { if ( Page.IsValid ) { Msg.Text="Page Valid"; } } void CustomServerVal (object source, ServerValidateEventArgs args) { try { if ( args.Value.Equals("Hello") ) { Msg.Text="ServerValidation called and TRUE returned."; args.IsValid=true; } else { Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; }
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