php - Custom form validation error message for Codeigniter 2

Question

I have a drop down named "business_id".

<select name="business_id"> 
    <option value="0">Select Business</option> More options... 
</select>

Here comes the validation rule, user must select an option.

$this->form_validation->set_rules('business_id', 'Business', 'greater_than[0]');

Problem being the error message says: The Business field must contain a number greater than 0. Not very intuitive! I want it to say "You must select a business".

I tried:

$this->form_validation->set_message('Business', 'You must select a business');

But CI complete ignores this. Does anyone have a solution for this?

Answer 1

I had the same requirement for adding custom form validation error messages in codeigniter 2 (e.g. "You must agree to our Terms & Conditions"). Naturally it would be wrong to override the error messages for require and greater_than as it would erroneously produce messages for the rest of the form. I extended the CI_Form_validation class and have overridden the set_rules method to accept a new 'message' parameter:

<?php

class MY_Form_validation extends CI_Form_validation
{
    private $_custom_field_errors = array();

    public function _execute($row, $rules, $postdata = NULL, $cycles = 0)
    {
        // Execute the parent method from CI_Form_validation.
        parent::_execute($row, $rules, $postdata, $cycles);

        // Override any error messages for the current field.
        if (isset($this->_error_array[$row['field']])
            && isset($this->_custom_field_errors[$row['field']]))
        {
            $message = str_replace(
                '%s',
                !empty($row['label']) ? $row['label'] : $row['field'],
                $this->_custom_field_errors[$row['field']]);

            $this->_error_array[$row['field']] = $message;
            $this->_field_data[$row['field']]['error'] = $message;
        }
    }

    public function set_rules($field, $label = '', $rules = '', $message = '')
    {
        $rules = parent::set_rules($field, $label, $rules);

        if (!empty($message))
        {
            $this->_custom_field_errors[$field] = $message;
        }

        return $rules;
    }
}

?>

With the above class you would produce your rule with a custom error message like so:

$this->form_validation->set_rules('business_id', 'Business', 'greater_than[0]', 'You must select a business');

You may also use '%s' in your custom message which will automatically fill in the label of fieldname.