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For some purpose (something like popup) I'm trying to fetch cart details in minicart.phtml from Magento2vendormagentomodule-checkoutviewfrontendtemplatescartminicart.phtml.

I directly modified core file just for checking purpose only. The point is cart details (from below code) are displaying only in cart page. It is not displaying in other pages like home page, product, category pages.I'm using default Magento EE 2.2.5 Luma theme. Any suggestion will be appreciated...

Below is my code (It's dirty, just for checking purpose),

$objectManager = MagentoFrameworkAppObjectManager::getInstance();

$cart = $objectManager->get('MagentoCheckoutModelCart'); 



// get quote items collection

$itemsCollection = $cart->getQuote()->getItemsCollection();



// get array of all items what can be display directly

$itemsVisible = $cart->getQuote()->getAllVisibleItems();



// get quote items array

$items = $cart->getQuote()->getAllItems();



foreach($items as $item) {

    echo 'ID: '.$item->getProductId().'<br />';

    echo 'Name: '.$item->getName().'<br />';

    echo 'Sku: '.$item->getSku().'<br />';

    echo 'Quantity: '.$item->getQty().'<br />';

    echo 'Price: '.$item->getPrice().'<br />';

    echo "<br />";            

}

I tried with block also through the constructor (like proper way) magento2eevendormagentomodule-checkoutBlockOnepage.php But same like working only in cart page. Not in other pages..

Update:

I'm just wondering below piece of code for fetching product details is working but not for cart.

$objectManager = MagentoFrameworkAppObjectManager::getInstance();

$productCollection = $objectManager->create('MagentoCatalogModelResourceModelProductCollection');

/** Apply filters here */

$collection = $productCollection->addAttributeToSelect('*')

            ->load();



foreach ($collection as $product){

     echo 'Name  =  '.$product->getName().'<br>';

     break;

}  

Little Modifications in your code.
Not sure but it should work I had same issue while ago.

Little modifications in your method.

You can give a try with MagentoCheckoutModelSession.

We are using below code on our custom phtml file which is located under

/view/frontend/templates/checkout/cart/custom.phtml

$om =   MagentoFrameworkAppObjectManager::getInstance();



//Getting cart Item//



$quote = $om->create('MagentoCheckoutModelCart')->getQuote();

$quoteitems = $quote->getAllVisibleItems();

You can try this one.

Get cart items from customer local storage.
And render it using knock out.

You can get Cart item details of the guest user also,

in your js file

define([

        'jquery',

        'knockout',

        'Magento_Customer/js/customer-data',

        'uiComponent'

    ], function ($, ko, customerData, Component) {

        return Component.extend({

            initialize: function () {

                self = this;

                self.cart = customerData.get('cart');



                let cartData = self.cart().items ? self.cart().items: ;



                cartData.map(function(item) {

                    console.log(item.product_id);

                    console.log(item.product_name);

                    console.log(item.product_sku);

                });



            },



        });

    });