Reason: There is Codeigniter 4 with a perfect validation library :)

This is a extension library of Form_validation

• Avoid resend POST vars on refresh form page (Don't worry about F5)
• Get Flashmessage for Errors
• Get Flashmessage for Success
• Ajax Validation Response
• Customize Ajax success response
• Customize Success Message
• Extends Validators (Easy and fast)

1. Download the latest release
2. Copy the folder FormValidation/ and the file MY_Form_validation.php to your Codeigniter folder application/libraries

application/
-- libraries/
---- FormValidation/
---- MY_Form_validation.php

Create a view file (using the functions to repopulate) The Form view

Create the controller method: The Form controller method

Create a controller method for validate your data (and save in database) The post controller method

Requirements: The JQuery plugin formHelper

Create a view file: The Form view

Create the controller method: The form controller

The post controller method

Open the file FormValidation/validators.php and create your function.

validators.php

/*This example is for Brasil Zip code*/
function zipcode($value)
{
    return ((preg_match('/^[0-9]{5,5}([-]?[0-9]{3,3})?$/', $value))===1);
}

Done, now you can use the function in your validation rules.

$this->form_validation->set_rules('zipcode', 'Zip code', 'required|zipcode', array('zipcode'=>'Escreva um cep valido'));

Setting the success message

Parameters:

• string $text - Success message

Sets the default prefix and suffix for success message

Parameters:

• string $open - Open delimiter
• string $close - Close delimiter

Redirect after execute validation

Parameters:

• string $redirect - URI/URL to redirect

Exclude Fields to re-populate

Parameters:

• array $array Associative array with the fields to exclude

Run the validation

Parameters:

• callable $success_cb Successfull callback
• callable $error_cb Error callback

Get the validation message

Return: string The message (Html code)

Get Form Values (JSON string) from flashdata

Return: string - Json string

Setting the message template

Parameters:

• string $template - Template string
• array $classType - (Optional) CSS Class to replace in template. Examples: ['class-error'=>'alert-danger', 'class-success'=>'alert-success']. Defaults: ['class-error'=>'error', 'class-success'=>'success']

Add variable on success json response (Only for ajax request)

Parameters:

• string $key - Key name
• string $value - Value

Display the value for input field. Use in a view file.

Parameters:

• string $field - Input name
• string $default - (Optional) Default value

Display 'checked' for input type checkbox and radio button. When the value is present in form values, display "checked". Use in a view file.

Parameters:

• string $field - Input name
• string $value - This value is setting? .. So, Checked

Display 'selected' for input select(comobobox). When the value is present in form values, display "selected". Use in a view file.

Parameters:

• string $field - Input name
• string $value - This value is setting? .. So, Selected