How can I update shipping price in the checkout page using controller Magento 2

Question

I have delivery timeslot options on the checkout page. I have added the delivery charge according to the timeslot.

I want to update the shipping amount if a customer selects a timeslot. I have used a controller which is working onchange timeslot & getting timeslot & delivery charge inside the controller.

Now I want to update the shipping amount on that basis.

My controller code:

<?php
namespace Ktpl\Custom\Controller\Dateslot;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\Request\Http;
use Magento\Quote\Model\Quote;
use Magento\Checkout\Model\Session as CheckoutSession;
use Magento\Framework\Stdlib\DateTime\TimezoneInterface;
class Apply extends \Magento\Framework\App\Action\Action
{
 protected $_http;
 protected $_quote;
 protected $_checkoutSession;
 protected $_result;
 private $timeZoneResolver;
 public function __construct(
 Context $context,
 Http $http,
 Quote $quote,
 CheckoutSession $checkoutSession,
 TimezoneInterface $timeZoneResolver
 ){
 parent::__construct($context);
 $this->_http = $http;
 $this->_quote = $quote;
 $this->_checkoutSession = $checkoutSession;
 $this->timeZoneResolver = $timeZoneResolver;
 }
 public function execute()
 {
 $results = array();
 $timeslot = $this->getHttp()->getParam('timeslot');
 $deliveryCharge = $this->getHttp()->getParam('delivery_charge');
 $quote = $this->getQuote();
 try{
 $quote->setTimeslot($timeslot);
 $quote->save();
 $this->_result['status'] = 200;
 $this->_result['message'] = __('timeslot has been applied successfully.');
 }
 catch(Exception $e){
 $this->_result['status'] = 201;
 $this->_result['message'] = $e->getMessage();
 }
 echo json_encode($this->_result);exit;
 }
 public function getHttp(){
 return $this->_http;
 }
 public function getQuote(){
 return $this->_checkoutSession->getQuote();
 }
 /**
 * Get prepared date/time
 *
 * @param string $date
 * @param int|null $time
 * @return string
 */
 private function getPreparedDateTime($date, $time = null)
 {
 $timezone = $this->timeZoneResolver->getConfigTimezone();
 $date = new \DateTime($date, new \DateTimeZone($timezone));
 if ($time) {
 $date->add(new \DateInterval('PT' . $time . 'S'));
 }
 return $this->timeZoneResolver->convertConfigTimeToUtc($date);
 }
}

Can anyone suggest how can I update the shipping amount from this controller?

• ZealousWeb: When your controller will call on checkout page?
• Vinod Kumar: The controller called when the customer selects a timeslot. BTW, it has been done.
• Vinod Kumar: I want to show this amount in the checkout summary but this is not working. I followed this URL: apptha.com/blog/magento-2-add-extra-fee-to-order-totals