How to override the existing module block files in magento2

Question

How to extend the block file functionality?

Because the search popular terms page shows as empty, so I have extended the block file as the following. But it is not working.

/app/code/Talk/CustomSearch/registration.php

<?php

\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'CustomSearch',
    __DIR__
);

/app/code/Talk/CustomSearch/etc/module.xml

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="CustomSearch" setup_version="1.0.0">
    </module>
</config>

/app/code/Talk/CustomSearch/etc/di.xml

<?xml version="1.0"?>
    <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
      <preference for="Magento\Search\Block\Term" type="Talk\CustomSearch\Block\Term" />
    </config>

/app/code/Talk/CustomSearch/Block/Term.php

<?php

/**
 * Search term block
 */
namespace Talk\CustomSearch\Block;


class Term extends \Magento\Search\Block\Term
{


    /**
     * Load terms and try to sort it by names
     *
     * @return $this
     */
    protected function _loadTerms()
    {
        exit('LoadTerms');
    }
}

The function _loadTerms() is not called. How to extend the block in the magento-search module?

Answer 1

Module name in registration.php and module.xml is not defined correctly. Has to be Talk_CustomSearch. Please correct and try again.

Answer 2

Solution!

Change CustomSearch into Talk_CustomSearch for both registration.php and module.xml

Additionally, I have implemented the function in the file /app/code/Talk/CustomSearch/Block/Term.php

protected function _toHtml()
    {
        $this->setModuleName($this->extractModuleName('Magento\Search\Block\Term'));
        return parent::_toHtml();
    }

Full Code

<?php

/**
 * Search term block
 */
namespace Talk\CustomSearch\Block;


class Term extends \Magento\Search\Block\Term
{


    /**
     * Load terms and try to sort it by names
     *
     * @return $this
     */
    protected function _loadTerms()
    {
        exit('LoadTerms');
    }


    protected function _toHtml()
    {
        $this->setModuleName($this->extractModuleName('Magento\Search\Block\Term'));
        return parent::_toHtml();
    }
}