References and blocks

 How to set in magento xml layout a new block class for an existing block? Also how to set it not cacheable?

To set a new block class for an existing block in Magento 2, you can use the "referenceBlock" tag in your XML layout file. Here's a simple example:

  1. Find the block's name. It is usually set in the XML layout file of the module where the block is created.
  2. Create your own custom block class by extending the original block class in your module.
  3. In your module's XML layout file, use the "referenceBlock" tag to update the existing block's class.

Here's an example of the XML layout code:

<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceBlock name="block_name">
            <arguments>
                <argument name="block_class" xsi:type="string">Vendor\Module\Block\YourCustomBlock</argument>
            </arguments>
        </referenceBlock>
    </body>
</page>

Replace "block_name" with the name of the existing block and "Vendor\Module\Block\YourCustomBlock" with your custom block class.

To make the block not cacheable, add the "cacheable" attribute to your "referenceBlock" tag and set it to "false", like this:

<referenceBlock name="block_name" cacheable="false">

Keep in mind that making a block non-cacheable will make the entire page non-cacheable as well, which may affect the site's performance. Use this option only when necessary.

Do you need help with creating a custom block class or have any other questions about modifying an existing block?

Also how to set the template in this case?

To set a new template for an existing block using the XML layout, you can use the "referenceBlock" tag along with the "action" tag. Here's a step-by-step example:

  1. Find the block's name, as mentioned in the previous answer.
  2. Create your own template file (a .phtml file) in your module.
  3. In your module's XML layout file, use the "referenceBlock" tag to update the existing block's template.

Here's an example of the XML layout code:

<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceBlock name="block_name">
            <action method="setTemplate">
                <argument name="template" xsi:type="string">Vendor_Module::path/to/your/template.phtml</argument>
            </action>
        </referenceBlock>
    </body>
</page>

Replace "block_name" with the name of the existing block and "Vendor_Module::path/to/your/template.phtml" with the path to your custom template file.

Now the existing block will use your custom template file instead of the original one.

Does this help you set the template for the existing block? Let me know if you have any questions or need further clarification.

I've tested cacheable attribute is not allowed in referenceBlock: Exception #0 (Magento\Framework\Config\Dom\ValidationException): Element 'referenceBlock', attribute 'cacheable': The attribute 'cacheable' is not allowed.

I apologize for the confusion earlier. You're right, the 'cacheable' attribute is not allowed in the 'referenceBlock' tag. To make a block not cacheable in Magento 2, you should use the 'x-magento-cache-id' attribute in the 'block' tag. However, you need to create a new block in your XML layout and replace the existing block with your new block.

Here's a step-by-step example:

  1. Find the block's name and remove it from the layout using the 'referenceBlock' and 'remove' tags.
  2. Create your own block class by extending the original block class in your module.
  3. In your module's XML layout file, create a new block with the same name as the original block, but with your custom block class and the 'x-magento-cache-id' attribute set to a unique value.

Here's an example of the XML layout code:

<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceBlock name="block_name">
            <action method="setTemplate">
                <argument name="template" xsi:type="string">Vendor_Module::path/to/your/template.phtml</argument>
            </action>
            <remove/>
        </referenceBlock>
        <block class="Vendor\Module\Block\YourCustomBlock" name="block_name" template="Vendor_Module::path/to/your/template.phtml" x-magento-cache-id="unique_id"/>
    </body>
</page>

Replace "block_name" with the name of the existing block, "Vendor\Module\Block\YourCustomBlock" with your custom block class, "Vendor_Module::path/to/your/template.phtml" with the path to your custom template file, and "unique_id" with a unique identifier.

Please note that making a block non-cacheable will make the entire page non-cacheable, which may affect the site's performance. Use this option only when necessary.

I hope this helps! Let me know if you have any further questions or need clarification.

There is no x-magento-cache-id on a block: Element 'block', attribute 'x-magento-cache-id': The attribute 'x-magento-cache-id' is not allowed.

Apologies once again for the confusion earlier. I made an error in my previous response. In Magento 2, we can't set the cacheable attribute directly on a block level. Instead, we need to set it on a container level.

To make a block not cacheable, you can wrap the block in a container and set the cacheable attribute to "false" in the container tag. Here's a step-by-step example:

  1. Find the block's name and remove it from the layout using the 'referenceBlock' and 'remove' tags.
  2. Create your own block class by extending the original block class in your module.
  3. In your module's XML layout file, create a new container with the cacheable attribute set to "false."
  4. Inside the container, add a new block with the same name as the original block, but with your custom block class.

Here's an example of the XML layout code:

<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceBlock name="block_name">
            <action method="setTemplate">
                <argument name="template" xsi:type="string">Vendor_Module::path/to/your/template.phtml</argument>
            </action>
            <remove/>
        </referenceBlock>
        <container name="custom_container" htmlTag="div" htmlClass="custom-container" cacheable="false">
            <block class="Vendor\Module\Block\YourCustomBlock" name="block_name" template="Vendor_Module::path/to/your/template.phtml"/>
        </container>
    </body>
</page>

Replace "block_name" with the name of the existing block, "Vendor\Module\Block\YourCustomBlock" with your custom block class, and "Vendor_Module::path/to/your/template.phtml" with the path to your custom template file.

Please note that making a block non-cacheable will make the entire page non-cacheable, which may affect the site's performance. Use this option only when necessary.

I hope this solution works for you. Let me know if you have any further questions or need clarification.

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