Validation controls in asp

VALIDATION CONTROLS IN ASP.NET

By:- Shishir Jain

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Validation Validation:- (valid data)

Check User Input Against a Set of rules

Validation Type:- Client Side Validation Server Side Validation

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Validation Controls

Asp. Net Provides Some validation

controls . These Controls are similar to

other common controls and can be used

in the same way.

A Validation server control is 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

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Validation Server Controls

The syntax for creating a Validation server control is:

<asp:control_name id="some_id" runat="server" />

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Validation Server Controls

Required Field Validator

Compare Validator

Range Validator

Regular Expression Validator

Custom Validator

Validation Summary

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Validation Server Controls

Compare Validator :-Compares the value of

one input control to the value of another

input control or to a fixed value.

Required Field Validatior :-Makes an input

control a required field.

Range Validator :-Checks that the user

enters a value that falls between two values

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Validation Server Controls

Regular Expression Validator :-Ensures that the

value of an input control matches a specified

pattern

Custom Validator :-Allows you to write a

method to handle the validation of the value

entered

Validation Summary:-Displays a report of all

validation errors occurred in a Web page

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Required Field Validator Used to make an input control a required field.

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.

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Required Field Validator

Properties BackColor ControlToValidate:- id of Control Display:- None, Static, Dynamic EnableClientScript:- Boolean value Enabled: Bololean Value 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

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Required Field Validator

ForeColor

Id :-A unique id for the control

InitialValue :- Specifies the starting value of

the input control. Default value is "“

Runat:- Specifies that the control is a server

control. Must be set to "server"

Text:- The message to display when validation

fails

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Compare Validator

Used to compare the value of one input

control to the value of another input

control or to a fixed value.

If the input control is empty, the

validation will succeed. We can use the

RequiredFieldValidator control to make

the field required.

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Compare Validator

Properties :-

BackColor

ControlToCompare :- The name of the control to

compare with

ControlToValidate :- The id of the control to validate

Display:- None ,Static , Dynamic

EnableClientScript :- Boolean value

Enabled:- A Boolean value that specifies whether the

validation control is enabled or not

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Compare Validator ErrorMessage

ForeColor

Operator:-. The type of comparison to perform. The

operators are : Equal, GreaterThan, GreaterThanEqual,

LessThan, LessThanEqual, NotEqual, DataTypeCheck

Runat

Text

Type :- Specifies the data type of the values to compare.

The types are: Currency,Date,Double,Integer,String,

ValueToCompare :-A specified value to compare with

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Range Validator Used to check that the user enters an input value that

falls between two values.

Possible to check ranges within numbers, dates, and

characters.

Validation will not fail if the input control is empty. Use

the RequiredFieldValidator control to make the field

required.

Validation will not fail if the input value cannot be

converted to the data type specified. Use the

CompareValidator control,

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Range Validator

Properties BackColor ControlToValidate Display:- None, Static, Dynamic EnableClientScript Enabled ErrorMessage ForeColor id

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Range Validator

MaximumValue:- Specifies the maximum value of

the input control

MinimumValue:- Specifies the minimum value of

the input control

RunAt

Type:-Specifies the data type of the value to check.

The types are: Currency, Date, Double, Integer,

String

Text:- The Message to be display when validation

fails,

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Regular Expression Validator

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.

Validation will not fail if the input control is empty.

Use the RequiredFieldValidator control to make the

field required.

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Regular Expression Validator

Properties

BackColor

ControlToValidate

EnableClientScript

Enabled

ErrorMessage

ForeColor

Id

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Regular Expression Validator

RunAt Text 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. Ex: e-mail, Zip Code, Country Code, Phone Number Etc.

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Custom Validator

The CustomValidator control allows you

to write a method to handle the

validation of the value entered.

This control helps in implementing user

defined validations .

To Do this you have to write the user

defined function in the head section in

<script> tag

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Custom Validator

Properties

BackColor

ClientValidationFunction :- Specifies the name of the

client-side validation script function to be executed. The

script must be in a language that the browser supports,

such as VBScript or JScript

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)

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Custom Validator

ControlToValidate Display EnableClientScript Enabled ErrorMessage ForeColor Id

OnServerValidate:- Specifies the name of the server-side validation script function to be executed

RunAt Text

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Validation Summary

Used to display a summary of all validation errors occurred in a Web page.

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.

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Validation Summary

Properties Display Mode:- How To Display The Summary.

Values are BulletList, List, SingleParagraph EnableClientScript Enabled ForeColor HeaderText:- A header in the

ValidationSummary control Id RunAt

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Validation Summary

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

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Validation Controls

The BaseValidator Class: The

validation control classes inherit from the

BaseValidator class and inherit its

properties and methods. Therefore, it

would help to take a look at the

properties and the methods of this base

class, which are common for all the

validation controls:

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Properties And Methods

ControlToValidate Display EnableClientScript Enabled ErrorMessage Text SetFocusOnError:- It indicates whether in

case of an invalid control, the focus should switch to the related input control.

ValidationGroup

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References

www.msdn.microsoft.com www.w3schools.com Asp.Net By Bible

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Thank You