Magento 2.1 – Update Shipping Rate on Providing Zipcode in Cart Page

Please add below code in .phtml file under your shipping calculator form for ajax call.

<script type="text/javascript">
            //<![CDATA[
                var coShippingEstimateForm = new VarienForm('your_form_id',true);
            //]]>
            function getEstimateShipping(){
                if (coShippingEstimateForm.validator.validate()) {
                    new Ajax.Updater(
                        { success:'result_container_id' }, "<?php echo $this->getUrl('your_route_name/your_controller/calculate') ?>", {
                            method:'post',
                            asynchronous:true,
                            evalScripts:false,
                            onSuccess:function(transport) {
                                var shiphtml = transport.responseText;
                                if(shiphtml != "" && shiphtml != null){
                                    $('result_container_id').insert(shiphtml).show();
                                }else{
                                    alert("No shipping method available");
                                }
                                $('submit').disabled = false;
                            },
                            onLoading:function(request, json){
                                $('submit').disabled = true;
                            },
                            parameters:jQuery('form').serialize(true)
                        }
                    );
                }
            }
        </script>

Now you need to create a controller action to handle the ajax request. Please refer below code snippet for that.

public function calculateAction()
    {
        $country    = (string) $this->getRequest()->getParam('country_id');
        $postcode   = (string) $this->getRequest()->getParam('estimate_postcode');
        $qty = intval($this->getRequest()->getParam('qty'));
        if($qty == 0 || $qty == null){
            $qty = 1;
        }

        $currentProductId = $this->getRequest()->getPost('currunt_product');
        $quote = Mage::getModel('sales/quote')->setStoreId(Mage::app()->getStore('default')->getId());
        $_product = Mage::getModel('catalog/product')->load($currentProductId);
        $params = $this->getRequest()->getParams();
        $reqOb = new Varien_Object($params);
        $_product->getStockItem()->setUseConfigManageStock(false);
        $_product->getStockItem()->setManageStock(false);
        $quote->addProduct($_product, $reqOb);
        $quote->getShippingAddress()->setCountryId($country)->setPostcode($postcode);
        $quote->getShippingAddress()->collectTotals();
        $quote->getShippingAddress()->setCollectShippingRates(true);
        $quote->getShippingAddress()->collectShippingRates();

        $groups = $quote->getShippingAddress()->getGroupedAllShippingRates();

        $shippingRates = array();
        $shippingHtml = "";
        $shippingBlock = new Mage_Checkout_Block_Cart_Shipping();
        foreach($groups as $code=>$_rates){
            $shippingHtml .= "<dt>" . $shippingBlock->getCarrierName($code) . "</dt><dd><ul>";
            foreach ($_rates as $_rate) {
                //if($_rate->getPrice() > 0) {
                $shippingHtml .= "<li><label>";
                $shippingHtml .= $_rate->getMethodTitle();
                $shippingHtml .= " - ";
                $shippingHtml .= Mage::helper('core')->currency($_rate->getPrice(), true, false);
                $shippingHtml .= "</label></li>";
            }
            $shippingHtml .= "</ul></dd>";
        }
        $this->getResponse()->setBody($shippingHtml);
    }

Let's say that the attribute code is called attribute_code so the getter name is getAttributeCode().

You need to create an arround plugin on the flatrate carrier model and UPS carrier model where you can check your conditions and return or not the shipping rate result.

You need to create a module and add this in the di.xml file

<type name="Magento\OfflineShipping\Model\Carrier\Flatrate">
    <plugin name="[module]-flatrate" type="[Vendor]\[Module]\Plugin\Flatrate" />
</type>

<type name="Magento\Ups\Model\Carrier">
    <plugin name="[module]-ups" type="[Vendor]\[Module]\Plugin\Ups" />
</type>

Then create the file [Vendor]/[Module]/Plugin/Flatrate.php

<?php 

namespace [Vendor]\[Module]\Plugin;

class Flatrate
{
    public function arroundCollectRates(
        \Magento\OfflineShipping\Model\Carrier\Flatrate $subject,
        \Closure $proceed,
        Magento\Quote\Model\Quote\Address\RateRequest $request
    ) {
        $items = $request->getAllItems();
        foreach ($items as $item) {
            if ($item->getProduct()->getAttributeCode()) {
                 //if your attribute value is true don't show this method
                 return false;
            }
        }
        return $proceed();
    }
}

and this plugin class that handles UPS shipping method [Vendor]/[Module]/Plugin/Ups.php

<?php 

namespace [Vendor]\[Module]\Plugin;

class Ups
{
    public function arroundCollectRates(
        \Magento\OfflineShipping\Model\Carrier\Ups $subject,
        \Closure $proceed,
        Magento\Quote\Model\Quote\Address\RateRequest $request
    ) {
        $items = $request->getAllItems();
        foreach ($items as $item) {
            if ($item->getProduct()->getAttributeCode()) {
                 //if one attribute value is true show the method
                 return $proceed();
            }
        }
        //if all the products had the value false don't show UPS.
        return false;
    }
}

But keep in mind that I didn't test the code so watch out for typos.