Magento 2 how to add city dropdown

Question

i am trying to city as dropdown in only checkout page with following script in Magento\Checkout\Block\Cart\LayoutProcessor.php

$elements = [
        'city' => [
            'visible' => true,
            'formElement' => 'select',
            'label' => __('City'),
            'options' => [
                [
                    'value' => '',
                    'label' => 'Please Select',
                ],
                [
                    'value' => '1',
                    'label' => 'First Option',
                ]
            ],
            'value' =>  null
        ],
        'country_id' => [
            'visible' => true,
            'formElement' => 'select',
            'label' => __('Country'),
            'options' => [],
            'value' => null
        ],
        'region_id' => [
            'visible' => true,
            'formElement' => 'select',
            'label' => __('State/Province'),
            'options' => [],
            'value' => null
        ],
        'postcode' => [
            'visible' => true,
            'formElement' => 'input',
            'label' => __('Zip/Postal Code'),
            'value' => null
        ]
    ];

but still it's showing as input text filed. Any one can please suggest best solution

Answer 1

You are working on wrong layoutProcessor. Please, read this documentation which will explain you how to modify existing field on checkout: http://devdocs.magento.com/guides/v2.0/howdoi/checkout/checkout_new_field.html

You should register your own layoutProcessor and modify layout array or, for tests purpose, you can modify vendor/magento/module-checkout/Block/Checkout/LayoutProcessor.php which is the proper class to work with.