Autocomplete data fields and saving the data in an array in cakephp 2.5.1

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MySQL

jQuery

CakePHP

I am new in CakePHP. I have a CakePHP application which has streets table (with columns street_name, house_no, district, city). I need to autocomplete these data in a form and save them in an array for further processing of the data. It should be like, the user will be typing a street name in the Street Name field of a form which has fields- Street Name, House No, District and City. After selecting a street name from auto suggestions, corresponding data (House No, District and City) will be populated in the other fields of the form.

What I have tried:

Now, over 25000 rows are loaded in the streets table which is the entire street database of a city. this table is not linked with other tables of the application through foreign keys. Street model in /Model/Street.php is following:

class Street extends AppModel {

  public function getStreet ($term = null) {
    if(!empty($term)) {
      $streets = $this->find('list', array(
        'conditions' => array(
          'street_name LIKE' => trim($term) . '%'
        )
      ));
      return $streets;
    }
    return false;
  }
}

In /Controller/StreetsController.php,

class StreetsController extends AppController {

   public function autocomplete($term){

   if ($this->request->is('get')) {
       $this->autoRender = false;
       $data = $this->Street->getStreet($term);
       $this->set(compact('data'));
       $this->set('_serialize', array('data'));

       echo json_encode($data);
       }
   }
 }

In /webroot/js/street.js file,

(function($) {
  $('#autocomplete').autocomplete({
        source: "/street.json"
  });
})(jQuery);

The input forms are in different controller. In View/Users/add.ctp file,

<fieldset>
        <legend><?php echo __('Address Data'); ?></legend>

        echo $this->Form->input('street_name', array(
                   'class' => 'ui-autocomplete',
                   'id' => 'autocomplete'));
        echo $this->Form->input('house_no');
        echo $this->Form->input('district');
        echo $this->Form->input('city');

  </fieldset>
  <?php echo $this->Form->end(__('Save')); ?>

Could anyone tell me please how to proceed further ? I found some tutorials where this autocomplete function is implemented using jQuery in CakePHP. But, it is implemented using same table, model, view and controller like cars, Car.php, /View/Cars/index.ctp , CarsController.php. which is not similar to my scenario.