Files used in ajax validation

action_validate.php

<?php

/**
 * @package Kohana validation
 *
 * @author shameer
 */
class Controller_User extends Controller_Default {

    /**
     * Validation function used for ajax validation
     */
    public function action_validate()
    {
        //disable auto rendering if requested using ajax
        if($this->request->is_ajax()){
            $this->auto_render = FALSE;
        }
        if($this->request->post()){
            $user  = new Model_User();
            // field name and the value to be validated
            $array[$_POST['fieldName']]   = $_POST['fieldVal'];
            //check if there is any related fields
            //if yes, add them to the array
            if(!empty($_POST['related'])) {
                foreach($_POST['related'] as $related){
                     $array[$related[0]] = $related[1];
                }
            }
            //call the validation function
            $validate = $user->validate($array);
            //check if it satisfies all rules
            if($validate->check()){
                echo 'true';
            }
            else{
                //if the validation fails, return the error message
                echo json_encode($validate->errors('signup'));
            }
        }
    }
}
?>

Model_User.php

<?php
class Model_User extends Model {

    /**
     *
     * Define the array of rules to be validated against
     * the signup information
     * @return array rules
     */
    public function rules() {
        return array(
            'username' => array(array('not_empty'),
                array('min_length', array(':value', 4)),
                array('max_length', array(':value', 32)),
                array('regex', array(':value', '/^[-\pL\pN_.]++$/uD')),
                array(array($this, 'check_exists'), array(':validation', ':field')),
            ),
            'password' => array(array('not_empty', NULL),
                array('min_length', array(':value', 6)),
            ),
            'passwordconfirm' => array(array('matches', array(':validation', 'passwordconfirm', 'password'))),
            'email' => array(array('email', NULL),
                array('not_empty', NULL),
                array(array($this, 'check_exists'), array(':validation', ':field')),
            )
        );
    }

    /**
     * Function to validate the input
     * 
     * @param array $array Post data to be validated
     * @return Validation object with rules applied
     */
    public function validate($array) {
        $post = Validation::factory($array);
        $rules = $this->rules();
        foreach ($array as $key => $val) {
            $rules = $rules[$key];
            $post->rules($key, $rules);
        }
        return $post;
    }

    /**
     * Custom validation function to check if the value exists in the db
     * in the given field. Used by the validation function
     * @param Validation $array
     * @param <type> $field
     */
    public function check_exists(Validation $array, $field) {
        $result = DB::select(array('count("*")', 'total_count'))
                        ->from('users')
                        ->where($field, '=', $array[$field])
                        ->where('status', '!=', 'Deleted')
                        ->execute($this->_db)
                        ->get('total_count');
        if ($result > 0) {
            $array->error($field, 'check_exists', array($array[$field]));
        }
    }

}
?>

signup.php

<?php defined('SYSPATH') or die('No direct script access.');

echo form::open('user/signup');
?>
<?php

if(!empty($errors)){
    foreach($errors as $error){
        echo $error.'<br>';
    }
}

?>
<style type="text/css">
    .error{
        border-color:#CC3333;
    }

</style>
<table>
    <tr>
        <td><?php echo Form::label('username', 'User Name'); ?></td>
        <td><?php echo form::input('username',$post['username'],array('class'=>'validate','id'=>'username')); ?></td>
    </tr>
    <tr>
        <td><?php echo Form::label('password', 'Password'); ?></td>
        <td><?php echo form::password('password',$post['password'],array('class'=>'validate','id'=>'password')); ?></td>
    </tr>
    <tr>
        <td><?php echo Form::label('passwordconfirm', 'Confirm Password'); ?></td>
        <td><?php echo form::password('passwordconfirm',$post['passwordconfirm'],
                array('class'=>'validate','rel'=>'password','id'=>'passwordconfirm')); ?></td>
    </tr>
    <tr>
        <td><?php echo Form::label('email', 'Email'); ?></td>
        <td><?php echo form::input('email',$post['email'],array('class'=>'validate','id'=>'email')); ?></td>
    </tr>
    <tr>
        <td></td>
        <td><?php echo form::submit('submit','Submit'); echo form::button('cancel', 'Cancel');?></td>
    </tr>
    
</table>
<?php

echo form::close();
echo html::script('assets/js/validate.js');
?>

validate.js

$(function(){
	$('.validate').blur(function(){
		var fieldName = $(this).attr('name');
		var fieldVal  = $.trim($(this).val());
		$(this).removeClass('error');
        if(typeof($(this).attr('rel'))!='undefined'){
            var relFields = $(this).attr('rel').split('|');
            var count   =   relFields.length;
            var related    = new Array();
            for(i=0;i<count;i++){
		$("#"+relFields[i]).removeClass('error');
                sub     =new Array();
                sub.push(relFields[i]);
                sub.push($.trim($("#"+relFields[i]).val()));
                related.push(sub);
            }
        }
	validate(fieldName,fieldVal,related);
	})


	$('.validate').focus(function(){
		$(this).next('.formError').remove();
	})

	function validate(fieldName,fieldVal,related){
		$.ajax({
			type:'post',
			url:'/kohana/index.php/ajax/validate',
			data:({
				fieldName:fieldName,
				fieldVal:fieldVal,
	                        related : related
				}),
			success:function(msg){
				if(msg!=''){
					var obj = $.parseJSON(msg);
					var key='';
					for(key in obj){
						var errMessage ='<div class="reqformError formError" style="top: 142px; left: 724px; margin-top: 0px; opacity: 0.87;"><div class="formErrorContent">'+obj[key]+'<br></div></div>';
						$('#'+key).after(errMessage);
						$('#'+key).addClass('error');
					}
				}
			}
		})
	}

})