Validation controls ppt
- 1. Introducing Validation Controls by PRAVEEN NANDAGIRI
- 2. Agenda How do we define Validation Controls Compare Validator Range Validator Regular Expression Validator Required Field Validator Custom Validator Validation Summary
- 3. Validation Server Controls Validation server controls are used to validate the data of an input control. If the data does not pass validation, it will display an error message to the user. The syntax for creating a Validation server control is: <asp:control_name id="some_id" runat="server" />
- 4. 1)Compare Validator Compares the value of one input control to the value of another input control or to a fixed value If the input control is empty, at first time (after page load )the validation will succeed. So it does not give any error message .that's why at first we give input to that control i.e., which control assigns compare validator .Use the RequiredFieldValidator control to make the field required . The main properties of Compare validator is Id : A unique id for the control ControlToCompare : The name of the control to compare with ControlToValidate : The id of the control to validate
- 5. ErrorMessage : The text to display in the ValidationSummary control when validation fails. This text will also be displayed in the validation control if the Text property is not set Text : The message to display when validation fails ValueToCompare : A specified value to compare with Type : Specifies the data type of the values to compare. Types are Currency Date Double Integer String
- 6. 2) Range Validator The RangeValidator control is used to check that the user enters an input value that falls between two values. It is possible to check ranges within numbers, dates, and characters. The validation will not fail if the input control is empty. Use the RequiredFieldValidator control to make the field required. The main properties are ControlToValidate : The id of the control to validate ErrorMessage : The text to display in the ValidationSummary control when validation fails. Note: This text(Error message) will also be displayed in the validation control if the Text property is not set
- 7. Id : A unique id for the control MaximumValue : Specifies the maximum value of the input control MinimumValue : Specifies the minimum value of the input control Text : The message to display when validation fails Display : The display behavior for the validation control. Legal values are: None (the control is not displayed. Used to show the error message only in the ValidationSummary control) Static (the control displays an error message if validation fails. Space is reserved on the page for the message even if the input passes validation.) Dynamic (the control displays an error message if validation fails. Space is not reserved on the page for the message if the input passes validation)
- 8. Type : Specifies the data type of the value to check. The types are: Currency Date Double Integer String
- 9. 3)Regular Expression Validator The RegularExpressionValidator control is used to ensure that an input value matches a specified pattern. Both server and client-side validation are performed unless the browser does not support client-side validation or the EnableClientScript property is set to false. The main properties of this control are Id : A unique id for the control ControlToValidate : The id of the control to validate Display : The display behavior for the validation control.
- 10. Legal values are: None (the control is not displayed. Used to show the error message only in the ValidationSummary control) Static (the control displays an error message if validation fails. Space is reserved on the page for the message even if the input passes validation.) Dynamic (the control displays an error message if validation fails. Space is not reserved on the page for the message if the input passes validation) ErrorMessage : The text to display in the ValidationSummary control when validation fails. Note: This text will also be displayed in the validation control if the Text property is not set
- 11. Text : The message to display when validation fails ValidationExpression : Specifies the expression used to validate input control. The expression validation syntax is different on the client than on the server. JScript is used on the client. On the server, the language you have specified is used
- 12. 4)RequiredFieldValidator The RequiredFieldValidator control is used to make an input control a required field. With this control, the validation fails if the input value does not change from its initial value. By default, the initial value is an empty string (""). Leading and trailing spaces of the input value are removed before validation. The InitialValue property does not set the default value for the input control. It indicates the value that you do not want the user to enter in the input control.
- 13. The main properties of the Required field validator is Id : A unique id for the control ControlToValidate : The id of the control to validate Display : The display behavior for the validation control. Legal values are None (the control is not displayed. Used to show the error message only in the ValidationSummary control) Static (the control displays an error message if validation fails. Space is reserved on the page for the message even if the input passes validation.) Dynamic (the control displays an error message if validation fails. Space is not reserved on the page for the message if the input passes validation)
- 14. ErrorMessage : The text to display in the ValidationSummary control when validation fails. Note: This text will also be displayed in the validation control if the Text property is not set InitialValue : Specifies the starting value of the input control. Default value is ““(nothing). Text : The message to display when validation fails
- 15. 5) CustomValidator The CustomValidator control allows you to write a method to handle the validation of the value entered. The main properties of the CustomValidator Control are Id : A unique id for the control ClientValidationFunction : Specifies the name of the client-side validation script function to be executed. Note: The script must be in a language that the browser supports, such as VBScript or JScript (Java Script). With VBScript, the function must be in the form: Sub FunctionName (source, arguments) With JScript, the function must be in the form: Function FunctionName (source, arguments) ControlToValidate : The id of the control to validate
- 16. ErrorMessage : The text to display in the ValidationSummary control when validation fails. Note: This text will also be displayed in the validation control if the Text property is not set Text : The message to display when validation fails Display : The display behavior for the validation control. Legal values are: None (the control is not displayed. Used to show the error message only in the ValidationSummary control) Static (the control displays an error message if validation fails. Space is reserved on the page for the message even if the input passes validation. Dynamic (the control displays an error message if validation fails. Space is not reserved on the page for the message if the input passes validation
- 17. 6)Validation Summary The ValidationSummary control is used to display a summary of all validation errors occurred in a Web page. The error message displayed in this control is specified by the ErrorMessage property of each validation control. If the ErrorMessage property of the validation control is not set, no error message is displayed for that validation control. The main properties of Validtion summary are DisplayMode : How to display the summary.
- 18. Legal values are: BulletList List SingleParagraph HeaderText : A header in the ValidationSummary control Id : A unique id for the control ShowMessageBox : A Boolean value that specifies whether the summary should be displayed in a message box or not ShowSummary : A Boolean value that specifies whether the ValidationSummary control should be displayed or hidden Ref URL : http://anildiggiwal.blogspot.com/2011/01/validation-server-controls.html
- 19. Thank You !