validation
- 2. Today What Validation controls do Benefits & Limitations Six Validation Controls Implementation Example
- 3. What Validation Controls Do Each control: Validates user inputs on client-side using JavaScript When possible Validates all inputs on server Writes client-side error message if invalid
- 4. Benefits and Limitations Benefits Convenience Cut & paste Bomb-proof Server-side validation Limitations Must remember to check on server Page.IsValid statement
- 5. Six Validation Controls 1. RequiredFieldValidator Only validator that checks for NO entry 1. CompareValidator Compares input to: datatype, constant, another control, database value, etc. 1. RangeValidator Entry within a specified data range
- 6. Six Validation Controls 4. RegularExpressionValidator Check format against a specific pattern E-mail address, phone number, zip code, etc. 4. CustomValidator Write own code Server- or client-side 4. ValidationSummary Summarizes all errors on page
- 7. Implementation Often need > 1 validator per input Only RequiredFieldValidator checks for empty fields Page.IsValid Check in event handler if (!Page.IsValid) return; Validation Groups Allow validation controls to be assigned to groups Page can have several groups Act independently Only group associated with postback event must have valid entries Example: No groups, groups Example: Required, Compare, Range, & Custom (client- and server-side script) Validation.aspx (source)
- 8. Summary Easy to use Flexible Validate any type of input Combines client- and server-side validation in one control Bomb-proof server-side validation