validation

validation

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  .NET Validation Controls.NETValidation Controls MacDonald Ch. 8MacDonald Ch. 8 MIS 324MIS 324 Professor SandvigProfessor Sandvig
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  TodayToday What Validation controlsdoWhat Validation controls do Benefits & LimitationsBenefits & Limitations Six Validation ControlsSix Validation Controls Implementation ExampleImplementation Example
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  What Validation ControlsDoWhat Validation Controls Do Each control:Each control: – Validates user inputs on client-side using JavaScriptValidates user inputs on client-side using JavaScript When possibleWhen possible – Validates all inputs on serverValidates all inputs on server – Writes client-side error message if invalidWrites client-side error message if invalid
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  Benefits and LimitationsBenefitsand Limitations BenefitsBenefits – ConvenienceConvenience Cut & pasteCut & paste – Bomb-proofBomb-proof Server-side validationServer-side validation LimitationsLimitations – Must remember to check on serverMust remember to check on server Page.IsValid statementPage.IsValid statement
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  Six Validation ControlsSixValidation Controls 1.1. RequiredFieldValidatorRequiredFieldValidator – Only validator that checks for NO entryOnly validator that checks for NO entry 1.1. CompareValidatorCompareValidator – Compares input to: datatype, constant,Compares input to: datatype, constant, another control, database value, etc.another control, database value, etc. 1.1. RangeValidatorRangeValidator – Entry within a specified data rangeEntry within a specified data range
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  Six Validation ControlsSixValidation Controls 4.4. RegularExpressionValidatorRegularExpressionValidator – Check format against a specific patternCheck format against a specific pattern – E-mail address, phone number, zip code, etc.E-mail address, phone number, zip code, etc. 4.4. CustomValidatorCustomValidator – Write own codeWrite own code – Server- or client-sideServer- or client-side 4.4. ValidationSummaryValidationSummary – Summarizes all errors on pageSummarizes all errors on page
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  ImplementationImplementation Often need >1 validator per inputOften need > 1 validator per input – Only RequiredFieldValidator checks for empty fieldsOnly RequiredFieldValidator checks for empty fields Page.IsValidPage.IsValid – Check in event handlerCheck in event handler if (!Page.IsValid) return;if (!Page.IsValid) return; Validation GroupsValidation Groups – Allow validation controls to be assigned to groupsAllow validation controls to be assigned to groups – Page can have several groupsPage can have several groups – Act independentlyAct independently – Only group associated with postback event must have valid entriesOnly group associated with postback event must have valid entries – Example:Example: No groupsNo groups, groups, groups Example:Example: – Required, Compare, Range,Required, Compare, Range, & Custom (client- and server-side script)& Custom (client- and server-side script) – Validation.aspx (source)Validation.aspx (source)
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  SummarySummary Easy to useEasyto use FlexibleFlexible – Validate any type of inputValidate any type of input Combines client- and server-sideCombines client- and server-side validation in one controlvalidation in one control Bomb-proof server-side validationBomb-proof server-side validation