address.js.erb - javascript for find and fill address fields using brcep gem

gistfile1.js

// requires

<% routes = Rails.application.routes.url_helpers %>

$(function () {
    $('#place_postal_code').on('change', function() {
        var $label = $('label[for=place_postal_code]'),
            value = $(this).val();

        var onSuccess = function(r) {
            $('#place_city').val(r.city);
            $('#place_state').val(r.state);
            $('#place_neighborhood').val(r.neighborhood);
            $('#place_street').val(r.street);
            $('#place_number').focus();
        };

        var onFail = function(r) {
            response = JSON.parse(r.responseText);
            alert(response.message) ;
        };

        var onComplete = function() { $label.text('CEP') };

        $label.text('Pesquisando...');

        $.ajax({
            url: '<%= routes.find_cep_path %>',
            data: { cep: value },
            dataType: 'json',
            cache: false,
            success: onSuccess,
            error: onFail,
            complete: onComplete
        });
    });
});