Validation Server Control

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Validation Server Control
Chapter 3
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Objectives

• Understanding validation
• Client side and Server side validation
• ASP.NET Validations
• Turning off Client-side validation
• Using Images and Sound for error notification
• Validation Group

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1. Understanding validation

• We have many kinds of control HTML, HTML server
  control, ASP.NET web control
• Remember that you have no way to validate the
  truthfulness of the information you collect.

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2. Client side and Server side validation
Use both of them
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3. ASP.NET Validations

• 3.1 ASP.NET Validations properties
• 3.2 six validation server

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3.1 ASP.NET Validations properties

• ASP.NET performs browser detection.
• If it support JS ? use client-side check
• If not support JS ? use server-side check
• Validation causes
• It occurs in response to an event (all buttons)
  with CausesValidation properties

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3.2 six validations server

• 3.2.1 RequiredFieldValidation
• 3.2.2 CompareValidator
• 3.2.3 RangeValidator
• 3.2.4 RegularExpressionValidator
• 3.2.5 CustomValidator
• 3.2.6 ValidationSummary

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3.2.1 RequiredFieldValidation

• Common Properties ErrorMessage,
  ControlToValidate
• InitialValue ? check with default value
• Disallowing blank entries and requiring changes
  at the same time gt two RequiredFieldValidator
  controls

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3.2.2 CompareValidator

• Validating against other controls (between two
  form elements)
• Properties ControlToCompare
• Validating against constants (data type)
• Type (can be currency, date, double, integer,
  string)
• Operator DataTypeCheck
• Validating against constants ( specific
  constants)
• Operator ,gt,gt,lt,lt, !
• ValueToCompare
• Type String, integer,..

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3.2.3 RangeValidator

• Type, MinimumValue, MaximumValue

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3.2.4 RegularExpressionValidator

• ValidationExpression
• Many template with expression editor
• www.regexlib.com

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3.2.5 CustomValidator

• we can choose client-side or server-side
  validation
• Client-side validation
• ClientValidationFunction js_fun
• Server-side validation
• OnServerValidate fn_name
• Make the validation as complex as application
  require
• Check with dynamic value from database
• BothUse two properties at the same time

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3.2.6 ValidationSummary

• Report for all validation errors
• Output with list, bulleted list, paragraph
• Output with dialog using ShowMessageBox true
• ShowSummary false

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4. Turning off Client-side validation

• All validation control have EnableClientScript
  true (default) or false

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5. Using Images and Sound for error notification

• Image
• ErrorMessage ltimg src.gifgt
• Sound
• ErrorMessageltbgsource src.wavgt
• Note you have to disable client-side script
• EnableClientScript false if you dont want
  the sound plays when page is loaded

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6. Validation Group

• ValidationGroup groupname
• Validators
• Buttons cause the validator
• SetFocusOnError true

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Q A

• In class exercise 5
• Name your website your_name_inclass1 zip it and
  email to huynq_at_saigontech.edu.vn