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How to add external CSS and JS Url in Magento2?

You can add External third-party JS,CSS, and fonts URL using Magento 2 by XML at below way, All the Url will be staying in  <head> tag. Pass Second attribute as  src_type=”url”

For set third-party JS link,

<head>
	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js" src_type="url" />
</head>

For set third-party CSS link,

<head>
	<css src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css" src_type="url" />
</head>

For set font link,

<head>
	<link src="http://fonts.googleapis.com/css?family=Montserrat" src_type="url" />
</head>

For Remove link from the page,  If you want to remove specific JS or CSS from the specific page you can use <remove> tag under the <head> to remove from a specific page.

<head>
    <remove src="ttps://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js" />
    <remove src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css" />
    <remove src="http://fonts.googleapis.com/css?family=Montserrat" />
</head>

 

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How to cancel order programmatically in magento 2?

In Magento 2 we can cancel an order using below way, Pass Magento/Sales/Api/OrderManagementInterface as DI to __construct() function. We can use Interface method to cancel the order in Magento 2.

Below code snippets is used for cancel order.

<?php

public function __construct(
    \Magento\Sales\Api\OrderManagementInterface $orderManagement
) {
    $this->orderManagement = $orderManagement;
}
/**
 * int $orderId
 * Order cancel by order id $orderId 
 */
public function cancelOrder($orderId) {
    try {
        $this->orderManagement->cancel($orderId);
        return __('You canceled the order successfully.');
    } catch (\Exception $e) {
        return __('You have not canceled the order.');
    }
}

Call function like below from template or any PHP file, $orderId Must be an integer.

$orderId = 1;
$this->cacelOrder($orderId);

The result will be getting based on order success like, You canceled the order successfully otherwise result will be like for error, You have not canceled the order.

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How to get product stock qty and stock information by product id in Magento 2?

You can get Product stock related information using the Catalog Inventory module of Magento 2.

Magento\CatalogInventory\Api\StockRegistryInterface is used for getting Stock Information from the Product.

If you want to only get Product Quantity and Product status might be it’s in stock or not then refer Get Product quantity from product object

Let’ create Block file and call function from a block,

<?php
namespace Rbj\Stockinfo\Block;

class Stockinfo extends \Magento\Framework\View\Element\Template
{
    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\CatalogInventory\Api\StockRegistryInterface $stockItemRepository,
        array $data = []
    )
    {
        $this->stockItemRepository = $stockItemRepository;
        parent::__construct($context, $data);
    }
    /* Using Product id */
    public function getStockItem($productId)
    {
        return $this->stockItemRepository->getStockItem($productId);
    }
    /* Using Product SKU */
    public function getStockItemBySku($productSku)
    {
        return $this->stockItemRepository->getStockItemBySku($productSku);
    }
}

Now, We can get the product stock information by id and SKU in a template file using the below way.

$id = 1; //Product id
/* by Product id */
$productStockById = $block->getStockItem($id);

/* by Product SKU */
$sku = '24-MB01';
$productStockBySku = $block->getStockItemBySku($sku);
echo "<pre>";print_r($productStockBySku->debug());

The output will be something like below,

Array
(
    [item_id] => 1
    [product_id] => 1
    [stock_id] => 1
    [qty] => 100.0000
    [min_qty] => 0.0000
    [use_config_min_qty] => 1
    [is_qty_decimal] => 0
    [backorders] => 0
    [use_config_backorders] => 1
    [min_sale_qty] => 1.0000
    [use_config_min_sale_qty] => 1
    [max_sale_qty] => 10000.0000
    [use_config_max_sale_qty] => 1
    [is_in_stock] => 1
    [notify_stock_qty] => 1.0000
    [use_config_notify_stock_qty] => 1
    [manage_stock] => 1
    [use_config_manage_stock] => 1
    [stock_status_changed_auto] => 0
    [use_config_qty_increments] => 1
    [qty_increments] => 1.0000
    [use_config_enable_qty_inc] => 1
    [enable_qty_increments] => 0
    [is_decimal_divided] => 0
    [website_id] => 0
    [type_id] => simple
)

You can get qty, min_sale_qty, is_in_stock, backorder, stock_id, website_id related data with ease.