Magento2: How to get config variable in block.php

Question

I want to get the value of config variable in my custom block.php file.

Can somebody help me in this?

So far, I did following this in my block file.

public function __construct(
 \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
 \Magento\Store\Model\StoreManagerInterface $storeManager
)
{
 $this->_scopeConfig = $scopeConfig;
 $this->_storeManager = $storeManager;
}
$this->_scopeConfig->getValue('carriers/freeshipping/free_shipping_subtotal', \Magento\Store\Model\ScopeInterface::SCOPE_STORE);

But I'm still not getting the value and showing error

( ! ) Fatal error: Uncaught Error: Call to a member function dispatch() on null in D:\wamp64\www\deboomhut0710\lib\internal\Magento\Framework\View\Element\AbstractBlock.php on line 644 ( ! ) Error: Call to a member function dispatch() on null in D:\wamp64\www\deboomhut0710\lib\internal\Magento\Framework\View\Element\AbstractBlock.php on line 644

Answer 1

The error you're getting is because your block needs to extend at least Magento\Framework\View\Element\AbstractBlock which is not the case.

It should look like this:

namespace Vendor\Module\Block;
use Magento\Framework\View\Element\AbstractBlock;
class MyBlock extends AbstractBlock {
 public function __construct(
 \Magento\Framework\View\Element\Context $context,
 \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
 \Magento\Store\Model\StoreManagerInterface $storeManager,
 array $data = []
 )
 {
 $this->_scopeConfig = $scopeConfig;
 $this->_storeManager = $storeManager;
 parent::__construct($context, $data);
 }
}

• Deeps: Thanks for your reply. Error has gone but still not able to get the config value. I want to get the minimum amount set for free shipping at backend.
• Raphael at Digital Pianism: @Deeps well your code to get the config value is totally valid. I'm not sure why it doesn't work
• Raphael at Digital Pianism: @Deeps are you sure you saved the configuration for the right store ?
• Keyur Shah: Can you please post your block file here ? @Deeps

Answer 2

Please use below code :

const SUBTOTAL = 'carriers/freeshipping/free_shipping_subtotal';
public function __construct(
 \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
)
{ 
 $this->scopeConfig = $scopeConfig;
}
public function getSubtotal() {
 $storeScope = \Magento\Store\Model\ScopeInterface::SCOPE_STORE;
 return $this->scopeConfig->getValue(self::SUBTOTAL, $storeScope); //you get your value here
}

Then in your template file try to get : $this->getSubtotal();