auto zip code

action.php

/**
 * @author Jokūbas Ramanauskas
 * @since  2015-03-26
 *
 * Fetches postcode by given address information
 *
 * @return bool
 */
public function getPostCodeByAddress()
{
    $city    = $this->_getPost('city');
    $address = $this->_getPost('address');
    if (!empty($city) && !empty($address)) {
        try {
            $result = file_get_contents(sprintf('http://postit.lt/data/?address=%s, %s', urlencode($address), urlencode($city)));
            if (!empty($result)) {
                $result = json_decode($result, 1);
                if (!empty($result['total'])) {
                    die(json_encode(array(
                        'status'  => 'OK',
                        'zipcode' => array_shift($result['data'])['post_code'],
                    )));
                }
            }
        } catch (Exception $e) {
            die(json_encode(array(
                'status' => 'error',
            )));
        }
    }
    die(json_encode(array(
        'status' => 'error',
    )));
}

script.js

$('*[data-event="addressChange"]').change(function(e){

    var $target = $(this);
    var $cityField = $($target.data('city-field'));
    if ($cityField.length > 0) {
        var $addressField = $target;
    } else {
        $cityField = $target;
        var $addressField = $($target.data('address-field'));
    }
    var $zipCodeField = $($target.data('zipcode-field'));
    var $zipCodeHelpField = $($zipCodeField.data('help-field'));
    $.ajax({
        type: 'POST',
        async: true,
        url: $zipCodeField.data('url'),
        data: {
            'city': $cityField.children('option:selected').text(),
            'address': $addressField.val()
        },
        beforeSend: function(){
            $zipCodeHelpField.attr('href', "http://postit.lt/paieška/" + encodeURIComponent($addressField.val()) + ", " + encodeURIComponent($cityField.children('option:selected').text()))
        },
        success: function(data){
            data = $.parseJSON(data);
            if (data.status === "OK") {
                $zipCodeField.val(data.zipcode);
            }
        }
    });
})