<?php
            echo $form->select2Row($model, 'contract_id', [
                'data' => [],
                'multiple' => false,
                'id' => 'contract',
                        'required' => true,
                'empty' => '',
                'ajax' => [
                    'type' => 'POST',
                    'dataType' => 'json',
                    'url' => CController::createUrl('Request/services'),
                    'success' => 'function(data) {
                                    var newOptions = "";
                                    var services = data.services;
                                    console.log(services);
                                    $.each(services, function(index, value){
                                        newOptions += "<option value=" + value.id + ">"  + value.text + "</option>";
                                    });
                                    $("#service").select2("destroy").html(newOptions).select2();
                                    $("#service").select2().select2({"width":"220px"});
                                }',
                ]
            ]);?>