.NET Validation Controls MIS 324 -- Professor Sandvig 7/24/2019 .NET Validation Controls

MIS 324 -- Professor Sandvig 7/24/2019 Today What Validation controls do Benefits & Limitations Six Validation Controls Implementation Example

What Validation Controls Do MIS 324 -- Professor Sandvig 7/24/2019 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

Benefits and Limitations MIS 324 -- Professor Sandvig 7/24/2019 Benefits and Limitations Benefits Convenience Cut & paste Bomb-proof Server-side validation Limitations Must remember to check on server Page.IsValid statement

Six Validation Controls MIS 324 -- Professor Sandvig 7/24/2019 Six Validation Controls RequiredFieldValidator Only validator that checks for NO entry CompareValidator Compares input to: datatype, constant, another control, database value, etc. RangeValidator Entry within a specified data range

Six Validation Controls MIS 324 -- Professor Sandvig 7/24/2019 Six Validation Controls RegularExpressionValidator Check format against a specific pattern E-mail address, phone number, zip code, etc. CustomValidator Write own code Server- or client-side ValidationSummary Summarizes all errors on page

MIS 324 -- Professor Sandvig 7/24/2019 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)

MIS 324 -- Professor Sandvig 7/24/2019 Summary Easy to use Flexible Validate any type of input Combines client- and server-side validation in one control Bomb-proof server-side validation