Validation controls ASP .NET

Validation controls ASP .NET

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  Disclaimer: This presentationis prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
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  VALIDATION CONTROLS IN.NET ARJUN S R Arjun.sr007@gmail.com www.facebook.com/arjun.a ryavartham twitter.com/arjun.sr007 in.linkedin.com/in/arjun.sr0 07 9745649882
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  • A validationcontrol (or validator) determines whether the data in another web control is in the proper format, before the data is processed. • When the XHTML for our page is created, the validator is converted into JavaScript that performs the validation • JavaScript is a scripting language that enhances the functionality and appearance of web pages and is typically executed on the client. • Because some clients disable or do not support scripting, ASP.NET validation controls can function on the client, on the server or both.
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  WHAT VALIDATION CONTROLS DO? •Rich, declarative validation • Validation declared separately from input control • Extensible validation framework • Supports validation on client and server • Server-side validation is always done – Prevents users from spoofing Web Forms • Validate User inputs 75% of code for handling exceptions Simplify task
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  SIX VALIDATION CONTROLS
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  1. RequiredFieldValidator  Ensuresthat a value is entered • <asp: RequiredFieldValidator 2. CompareValidator – Compares input to: data type, constant, another control, database value, etc – <asp: CompareValidator> 3. RangeValidator – Entry within a specified data range – <asp: RangeValidator> 4. ValidationSummary – Summarizes all errors on page – <asp: ValidationSummary>
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  4. RegularExpressionValidator – Checkformat against a specific pattern – E-mail address, phone number, zip code, etc – <asp: RegularExpressionValidator> 5. CustomValidator – Write own code – Server- or client-side – <asp: CustomValidator>
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  • Validation controlsare derived from System.Web.UI.WebControls.BaseValidator, which is derived from the Label control • Validation controls contain text which is displayed only if validation fails • Text property is displayed at control location • ErrorMessage is displayed in summary • Page.IsValid indicates if all validation controls on the page succeed void Submit_click(object s, EventArgs e) { if (Page.IsValid) { Message. Text = "Page is valid!"; } }
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  RequiredFieldValidator <asp: RequiredFieldValidator id=”reqFirstName” ControlToValidate=”txtFirstName”Text=”(Required)” SetFocusOnError=”true” Runat=”server” />
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  CompareValidator <asp: CompareValidator id=”cmpBirthDate”Text=”(Invalid Date)” ControlToValidate=”txtBirthDate” Type=”Date” Operator=”DataTypeCheck” Runat=”server” />
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  RangeValidator <asp: RangeValidator id=”reqAge”ControlToValidate=”txtAge” Text=”(Invalid Age)” MinimumValue=”5” MaximumValue=”100” Type=”Integer” Runat=”server” />
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  ValidationSummary <asp: ValidationSummary id=”ValidationSummary1”ShowMessageBox=”true” ShowSummary=”false” Runat=”server” />
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  RegularExpressionValidator • <asp: RegularExpressionValidatorid=”regEmail” ControlToValidate=”txtEmail” Text=”(Invalid email)” ValidationExpression=”w+([-+.’]w+)*@w+([-.]w+)*.w+([-.]w+)*” Runat=”server” />
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  CustomValidator • <asp: CustomValidatorid=”valComments” ControlToValidate=”txtComments” Text=”(Comments must be less than 10 characters)” OnServerValidate=”valComments_ServerValidate” Runat=”server” />
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  BENEFITS AND LIMITATIONS Benefits –Convenience • Cut & paste – Bomb-proof • Server-side validation Limitations – Must remember to check on server • Page.IsValid statement – Different interpretations of regular expressions • JavaScript vs. server • minor issue
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  SUMMARY • Easy touse • Flexible – Validate any type of input • Combines client- and server-side validation in one control • Bomb-proof server-side validation
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