Ttdfjt

I need to add Country and State Dropdown in Magento 2 admin form.
Please help me.

To add Country and State Dropdown in admin form, follow below steps:

In your form Block file:

Define variables:

protected $_regionFactory;
protected $_countryFactory;

In Construction:

public function __construct(
 ...
 MagentoDirectoryModelRegionFactory $regionFactory,
 MagentoDirectoryModelConfigSourceCountry $countryFactory,
 ...
 ) 
 ...
 $this->_regionFactory = $regionFactory;
 $this->_countryFactory = $countryFactory;
 ...
 

In initForm :

$countries = $this->_countryFactory->toOptionArray();

 $countryData = $fieldset->addField(
 'mycountry',
 'select',
 [
 'name' => 'mycountry',
 'data-form-part' => $this->getData('target_form'),
 'title' => __('Country'),
 'label' => __('Country'),
 'value' => $partner['mycountry'],
 'values' => $countries
 ]
 );

 $regionCollection = $this->_regionFactory->create()->getCollection()->addCountryFilter($partner['mycountry']);
 $regions = $regionCollection->toOptionArray();

 $fieldset->addField(
 'mystate',
 'select',
 [
 'name' => 'mystate',
 'data-form-part' => $this->getData('target_form'),
 'title' => __('State'),
 'label' => __('State'),
 'values' => $regions,
 'value' => $partner['mystate'],
 ]
 );
 $countryData->setAfterElementHtml(" 
 <script type="text/javascript">
 require([
 'jquery',
 'mage/template',
 'jquery/ui',
 'mage/translate'
 ],
 function($, mageTemplate) 
 $('#edit_form').on('change', '#country_id', function(event)
 $.ajax(
 url : '". $this->getUrl('test/*/regionlist') . "country/' + $('#country_id').val(),
 type: 'get',
 dataType: 'json',
 showLoader:true,
 success: function(data)
 $('#region_id').empty();
 $('#region_id').append(data.htmlconent);
 
 );
 )
 

 );
 </script>"
 );

Here $partner is the variable which contain all form data.

Can you use below code

<?php
/**
 * @var MagentoDirectoryModelConfigSourceCountry
 */
protected $_country;

/**
 * @var MagentoDirectoryModelRegionFactory
 */
protected $_regionFactory;

// ... add them in __construct

// ...

// Add next changes in the _prepareForm method

$countries = $this->_country->toOptionArray(false, 'US');
$regionCollection = $this->_regionFactory->create()->getCollection()->addCountryFilter(
 $formData['country_id']
);
$regions = $regionCollection->toOptionArray();

$fieldset->addField(
 'country_id',
 'select',
 ['name' => 'country_id', 'label' => __('Country'), 'required' => true, 'values' => $countries]
);

$fieldset->addField(
 'region_id',
 'select',
 ['name' => 'region_id', 'label' => __('State'), 'values' => $regions]
);


$this->setChild(
 'form_after',
 $this->getLayout()->createBlock('MagentoFrameworkViewElementTemplate')->setTemplate('Vendor_Module::js.phtml')
);
?>

> Vendor_Module::js.phtml

<script>
 require([
 "jquery",
 "mage/adminhtml/form"
 ], function ($) 

 var updater = new RegionUpdater($('[name=country_id]')[0], $('[name=region]')[0], $('[name=region_id]')[0],
 <?php echo $this->helper('MagentoDirectoryHelperData')->getRegionJson() ?>,
 'hide'
 );
 updater.disableRegionValidation();
 window.updater = updater;
 );
</script>