Validation controls ASP .NET
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This document discusses validation controls in .NET, which determine if data entered into web controls is valid before processing. There are six main validation controls: RequiredFieldValidator, CompareValidator, RangeValidator, ValidationSummary, RegularExpressionValidator, and CustomValidator. Validation controls validate user input on both the client-side using JavaScript and server-side to prevent spoofing. They make validation easier by allowing declarative validation that is separate from input controls and provide a flexible extensible framework.
![RegularExpressionValidator
• <asp: RegularExpressionValidator id=”regEmail”
ControlToValidate=”txtEmail” Text=”(Invalid email)”
ValidationExpression=”w+([-+.’]w+)*@w+([-.]w+)*.w+([-.]w+)*”
Runat=”server” />](https://image.slidesharecdn.com/validationcontrols-130522203957-phpapp01/85/Validation-controls-ASP-NET-14-320.jpg)
Validation controls ASP .NET
- 2. Disclaimer: This presentation is 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
- 3. VALIDATION CONTROLS IN .NET ARJUN S R [email protected] www.facebook.com/arjun.a ryavartham twitter.com/arjun.sr007 in.linkedin.com/in/arjun.sr0 07 9745649882
- 4. • A validation control (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.
- 5. 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
- 7. 1. RequiredFieldValidator Ensures that 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>
- 8. 4. RegularExpressionValidator – Check format 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>
- 9. • Validation controls are 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!"; } }
- 10. RequiredFieldValidator <asp: RequiredFieldValidator id=”reqFirstName” ControlToValidate=”txtFirstName” Text=”(Required)” SetFocusOnError=”true” Runat=”server” />
- 11. CompareValidator <asp: CompareValidator id=”cmpBirthDate” Text=”(Invalid Date)” ControlToValidate=”txtBirthDate” Type=”Date” Operator=”DataTypeCheck” Runat=”server” />
- 12. RangeValidator <asp: RangeValidator id=”reqAge” ControlToValidate=”txtAge” Text=”(Invalid Age)” MinimumValue=”5” MaximumValue=”100” Type=”Integer” Runat=”server” />
- 13. ValidationSummary <asp: ValidationSummary id=”ValidationSummary1” ShowMessageBox=”true” ShowSummary=”false” Runat=”server” />
- 14. RegularExpressionValidator • <asp: RegularExpressionValidator id=”regEmail” ControlToValidate=”txtEmail” Text=”(Invalid email)” ValidationExpression=”w+([-+.’]w+)*@w+([-.]w+)*.w+([-.]w+)*” Runat=”server” />
- 15. CustomValidator • <asp: CustomValidator id=”valComments” ControlToValidate=”txtComments” Text=”(Comments must be less than 10 characters)” OnServerValidate=”valComments_ServerValidate” Runat=”server” />
- 16. 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
- 17. SUMMARY • Easy to use • Flexible – Validate any type of input • Combines client- and server-side validation in one control • Bomb-proof server-side validation
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