Laravel Form Validation

Client-Side and Server-Side Validation

• Client-Side Validation: In JavaScript, hackers can bypass it.
• Server-Side Validation: Hackers cannot bypass it, it is secure. Used in Laravel.

CSRF Token

• First, pass the CSRF token in the form.
• Important for server and client-side validation.

Using Form Validation

1. Add User Function in Controller:
   • Use the Request class.
   • Use the validate method for field validation.
2. Validation Rules:
   • required: Field is mandatory.
   • email: Must be a valid email address.
   • numeric: Value must be numeric.

Form HTML

• Include the CSRF token.
• Fields: User Name, Email, AGE, City (Select Box)
• Submit Button: Submit the form.

Using Validation in Controller

public function addUser(Request $request) {
    $request->validate([ 
        'user_name' => 'required',
        'user_email' => 'required|email',
        'user_age' => 'required|numeric|min:18|max:65'
    ]);
    // Validation for maximum and minimum age
}

Logging Errors

• Print Errors: Use @errors->all().
• Error Messages in Form:
  • @error('field_name') <div>{{ $message }}</div>@enderror

Custom Validation Messages

• Define Custom Rules in the Third Parameter:

$request->validate([
    'user_name' => 'required',
    'user_email' => 'required|email',
    'user_password' => 'required|min:6|alpha_num'
], [
    'user_name.required' => 'User name is required',
    'user_email.email' => 'Your email is not correct',
    // Other custom messages
]);

Available Validation Rules

• Check Laravel Documentation: Validation Rules
  • Read and apply custom rules.

File for Customization

• Edit the lang/en/validation.php file to customize validation messages.

Useful Validation Rules for Reference

• With Range:
  • min:XX, max:XX, between:XX,YY, confirmed (for password confirmation)
• Error Message Customization:
  • 'attribute' => 'use a good name'

Tips

• CSRF Token: Ensure to use the CSRF token in all forms.
• Custom Messages in Validator: Personalize the errors.
• Data Protection: Ensure validation of all important data.

Conclusion

• Key differences between client and server-side validation.
• Important validation rules in Laravel.
• How to create custom error messages.
• Use of all Laravel validation rules available in the documentation.