validation controlss

1. BY-Teach4u.in

2. Today
What Validation controls do
Benefits & Limitations
Six Validation Controls
Implementation Example

3. What Validation Controls Do
Each control:
Validates user inputs on client-side using JavaScript
 When possible
Validates all inputs on server
Writes client-side error message if invalid

4. Benefits and Limitations
Benefits
Convenience
 Cut & paste
Bomb-proof
 Server-side validation
Limitations
Must remember to check on server
 Page.IsValid statement

5. Six Validation Controls
1. RequiredFieldValidator
 Only validator that checks for NO entry
1. CompareValidator
 Compares input to: datatype, constant, another
control, database value, etc.
1. RangeValidator
 Entry within a specified data range

6. Six Validation Controls
4. RegularExpressionValidator
 Check format against a specific pattern
 E-mail address, phone number, zip code, etc.
4. CustomValidator
 Write own code
 Server- or client-side
4. ValidationSummary
 Summarizes all errors on page

7. Implementation
 Often need > 1 validator per input
 Only RequiredFieldValidator checks for empty fields
 Page.IsValid
 Check in event handler
 if (!Page.IsValid) return;
 Validation Groups
 Allow validation controls to be assigned to groups
 Page can have several groups
 Act independently
 Only group associated with postback event must have valid entries
 Example: No groups, groups
 Example:
 Required, Compare, Range,
& Custom (client- and server-side script)
 Validation.aspx (source)

8. Summary
Easy to use
Flexible
Validate any type of input
Combines client- and server-side validation in one
control
Bomb-proof server-side validation