Update field aflter select other

Hello everyone.

I have a small problem, and maybe you know how to solve this:

I have a table with town and city and i need that after select town , the field for city to autocomplete. 

Please note that there are many town in one city, so i need to update the city field with exact city from the table.

Database table looks like this: id | town | city

my ctp file look like this

 echo $this->Form->input('User.town', array(

       'options' => $city,  

        'class' => array('form-control', 'chosen-select'),

         'label' => false,

          'empty' => 'Towns',

     ));

 echo $this->Form->input('User.city', array(

        'readonly' => 'readonly',

        'class' => array('form-control', 'chosen-select'),

        'label' => false

 ));

I'm using cakephp 2.5 and i'm new in cakephp.

Thanks in advance for the help.

Best Regards,

Stefan

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