Lesson 11 Valid a Tors

8/6/2019 Lesson 11 Valid a Tors

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Web Engineering-II

Using ASP.net

By

Adnan Amin

Lecturer / Software Programmer

Information and Communication Technology

( ICT Dept NIMA )

Adnan Amin (Lecturer / Programmer) 1


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Types of Validator Controls0 There are six validator controls which are the following:

1. RequiredFieldValidator

2. RangeValidator

3. CompareValidator

4. RegularExpressionValidator

5. CustomValidator6. ValidationSummary



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Six validation controls with descriptionSix validation controls with description

Validation Server Control Description

RequiredFieldValidatorEnsures that the user does not skip a form entry field.

CompareValidator

Allows for comparisons between the users input and another

item using a comparison operator (equals, greater than, less

than, and so on).

RangeValidator

Checks the users input based upon a lower- and upper level

range of numbers or characters.

RegularExpressionValidator

Checks that the users entry matches a pattern defined by a

regular expression. This is a good control to use to check e-mail

addresses and phone numbers.

CustomValidatorChecks the users entry using custom-coded validation logic.

ValidationSummaryDisplays all the error messages from the validators in one specific

spot on the page.Adnan Amin (Lecturer / Programmer) 3


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1. The RequiredFieldValidator Control

0 The RequiredFieldValidator control simply checks to see if

something was entered into the HTML form element.

0 It is a simple validation control, but it is one of the most

frequently used.

0 You must have a RequiredFieldValidator control for each

form element on which you wish to enforce a value-

requiredrule where the user must enter a value (not leave

as blank).



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Example: Validation using textbox control.

0 Add the following controls and set their properties;

Control name Properties Values

Label Text Your Name:

Textbox1RequiredFieldValidator1 ControlToValidate Textbox1

ErrorMessage * Your Name is required.

Your Name:

* RequiredFieldValidator1

textbox1

Codes on next slide.



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Codes for Validation using textbox control.

The first property to look at is the ErrorMessage property.

This property is the value that is shown to the end user via the Web page if

the validation fails.

The second property to look at is the ControlToValidate property.

This property is used to make an association between this validation server

control and the ASP.NET form element (control e.g textbox) that requires the

validation. Adnan Amin (Lecturer / Programmer) 6


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2. The CompareValidator Server Control

The CompareValidatorcontrol allows you to make

comparisons between two form elements.

For example:

You can specify that a form elements value must be an

integer and greater than number or less than a specified

number.

You can also state that values must be strings, dates, or other

data types.



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Add two textbox controls on to web form

0 Add the following controls and set their properties;


Label Text Your Name:

Textbox1

RequiredFieldValidator1 ControlToValidate Textbox1

ErrorMessage * Password is required.

CompareValidator1 ControlToValidate TextBox2

ControlToCompare Textbox1

ErrorMessage * Password is not matched

Password:

* RequiredFieldValidator1

Re-Password:

* CompareValidator1

textbox1


textbox2Adnan Amin (Lecturer / Programmer) 8


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Codes forCodes for CompareValidatorCompareValidator Control.Control.

Password:

Re-enter password:


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The Operator property can take one of the following values:The Operator property can take one of the following values:

0 Equal

0NotEqual

0 GreaterThan0 GreaterThanEqual

0 LessThan

0 LessThanEqual

0 DataTypeCheck

Age:

Adnan Amin (Lecturer / Programmer) 1 0


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3. The RangeValidator Server Control

0 The RangeValidator control is quite similar to that of theCompareValidator control,

0 but it makes sure that the end user value or selection provided

is between a specified range as opposed to being just greaterthan or less than a specified constant.

0 For an example of this, go back to the text-box element that

asks for the age of the end user and performs a validation onthe value provided.



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Example: Validation using textbox control.

0 Add the following controls and set their properties;Control name Properties Values

Label Text Age:

Textbox1RangeValidator ControlToValidate Textbox1

ErrorMessage * Need age b/w 20-50

Type Integer

MaximumValue 20

MinimumValue 50

Age:

* RangeValidator1textbox1




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Code/Example for RangeValidator

Age:



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4. The RegularExpressionValidator Server Control

0 you can check a users input based on a pattern that youdefine using a regular expression.

0 This means that you can define a structure that a users input

will be applied against to see if its structure matches the one

that you define.0 The user defined structure may be zip code , telephone

number, email address and URL etc.



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Validation for an e-mail address using

RegularExpression


Label Text Enter Your Email Address:

Textbox1

RegularExpression ControlToValidate Textbox1

ErrorMessage * Enter valid email address

ValidationExpression \w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

Age:

* RangeValidator1textbox1




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Code/Example for RegularExpression

Enter Your Email Address:



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Regular Expression Editor

0 Visual Studio 2005 makes it alittle easier to use regularexpressions by introducingthe Regular ExpressionEditor. This editor provides afew commonly used regularexpressions that you mightwant to apply to your

RegularExpressionValidator.



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6. The ValidationSummary Server Control

0 The ValidationSummary control is not a control that performs

validations on the content input into your Web forms.

0 Instead, this control is the reporting control, which is used by

the other validation controls on a page.

0

You can use this validation control to consolidate errorreporting for all the validation errors that occur on a page

instead of leaving this up to each and every individual

validation control.



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Add the following controls on web form and set the following

properties accordingly.Controls Name Properties Name Properties Values.

Label1 Text First Name

Label2 Text Last Name

Button1 Text Send

RequiredFieldValidator1

ErrorMessage * First name is required.ControlToValidate Textbox1ValidationGroup Abc (or any other name)

RequiredFieldValidator2

ErrorMessage * Last name is required.ControlToValidate Textbox2ValidationGroup Abc

ValidationSummary1

ShowSummary or ShowMessageBox TrueValidationGroup1 Abc

Button1

Text SendCausesValidation

True



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First Name: [requiredFieldValidator1]

Last Name: [requiredFieldValidator2]

Send ValidationSummary

Arrange all the controls on web form in given layout

Output Design View using asp.net

Adnan Amin (Lecturer / Programmer) 2 0


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Codes:

First Name:

Last Name:



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Thank You!0 References

0 Adnans lecture material

0 Professional ASP.net by Wrox team0 www.geoamins.com


Date post:	08-Apr-2018
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Lesson 11 Valid a Tors

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