I need to add a new function to the configurable.php block, located in Magento\ConfigurableProduct\Block\Product\View\Type\Configurable. It's a function similar to $block->getJsonConfig() except it gets some different values.

Can I do this (add a new method/function) through a plugin or do I have to override the original block? I'm not changing or removing any of the original functionality, just need to be able to call another function from the phtml file. If I override, does that mean I need to copy all the original methods from the original block php or can I just define the new function I need in my override file?

Edit: I have followed Aaron's advice for extending the original class. Here is my di.xml file:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
        type="zzTest\zzModule\Block\Product\View\Type\Configurable" />

Here is what zzTest\zzModule\Block\Product\View\Type\Configurable.php looks like:


namespace zzTest\zzModule\Block\Product\View\Type;
use Magento\ConfigurableProduct\Block\Product\View\Type\Configurable;
class Configurable extends \Magento\ConfigurableProduct\Block\Product\View\Type\Configurable
    public function getXPPackCounts()
        return 'good';

Finally, I attempt to call this function from configurable.phtml in design/frontend/my/theme/Magento_ConfigurableProduct/templates/product/view/type/options/configurable.phtml . My calling code looks like this:

<?php /* @escapeNotVerified */ echo $block->getXPPackCounts() ?>

I know this phtml file is being called okay because I have other stuff on it that shows up. But I don't receive any output from my call. What have I setup incorrectly?

1 Answer 1


Plugins are not used for adding a method, they are for altering the input/output of an existing public method.

You'll need to replace the block with one that reuses the template but has a class which extends Magento\ConfigurableProduct\Block\Product\View\Type\Configurable and contains your method.

In {module_dir}/view/frontend/layout/catalog_product_view_type_configurable.xml :

<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
        <referenceBlock name="product.info.options.configurable" remove="true"/>
        <referenceBlock name="product.info.options.wrapper">
            <block class="Your\Module\Block\Product\View\Type\Configurable" name="my.product.info.options.configurable" before="-" template="Magento_ConfigurableProduct::product/view/type/options/configurable.phtml"/>
  • Aaron, I have taken the steps you suggest, however I am not able to call the functions from the configurable.phtml file. I have added the contents of my di.xml and class extension file to the O.P. , as well as the php code I use to call the new method of the extending class.
    – Todd
    Commented Sep 14, 2016 at 13:25
  • I guess dependency injection won't work in this case because the block is being called from a layout xml and not a php constructor. Regardless, you should be able to replace the block in layout. I'll change the answer to reflect this. Commented Sep 14, 2016 at 18:35
  • When I did as you suggested, and added the xml file, I got some interesting results. The remove directive is ignored, but a second version of the block appears on the page - in one of the blocks I get the output from the special class (a string containing "good") and the other one still doesn't work. Also, I had to leave the preference in the di.xml or magento breaks. Pretty confusing!
    – Todd
    Commented Sep 14, 2016 at 20:42
  • It's a mystery as to why the remove directive doesn't work in this case. This is a bit of a hack, but to get rid of that block you could create an 'afterGetHtml' plugin for the Magento\ConfigurableProduct\Block\Product\View\Type\Configurable class that just returns an empty string. As for the offending preference in di.xml, try deleting the var/generation directory. Commented Sep 16, 2016 at 20:34
  • This statement is incorrect: Plugins are not used for adding a method, they are for altering the input/output of an existing public method....there is an around listener that can be used to modify content of that function
    – tread
    Commented Jan 5, 2017 at 13:05

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