How to override template with block class in Magento 2.2.1

Question

I want to override product main page title of product view page with block class.

So I use referenceBlock page.main.title with class like this

<referenceBlock class="Magento\Catalog\Block\Product\View" name="page.main.title" template="Vendor_Module::html/title.phtml"/>

But Magento 2.2.1 shows error like this: not allow attrbute class with referenceBlock

So how can i achieve this in Magento 2.2.1?

Answer 1

Use this :

<referenceBlock name="page.main.title">
 <action method="setTemplate">
 <argument name="template" xsi:type="string">Vendor_Module::html/title.phtml</argument>
 </action>
</referenceBlock>

To override class using di.xml :

<preference for="Magento\Catalog\Block\Product\View" type="Vendor\ModuleName\Block\Product\View" />

Hope it Helps!

• Rahul: Thanks for answer. But I also want to change block class of referanceBlock. How can I change both block class and template with reference block?
• Rahul: I know that how override block with di.xml. But I want just override template with custom block class with referenceBlock.
• Ronak Chauhan: Then you have to create new block and remove old one.

Answer 2

Use this:

<referenceBlock name="page.main.title">
 <block class="Magento\Catalog\Block\Product\View" name="abc" template="Vendor_Module::html/title.phtml"/>
</referenceBlock>

• Rahul: Thanks for answer. But this will add new block in page.main.title . I need to override title.phtml with block class

Answer 3

I found the solution

I just keep same name of block ad change both class and template.

Code:

<block class="Vendor\Module\Block\Product\View" name="page.main.title" template="Vendor_Module::html/title.phtml" before="product.info.main"/>

• Nick Rolando: This isn't working for me.

Answer 4

As the error clearly says, you cannot use class attribute within referenceBlock tag. You are referencing the name of the existing block with already defined class.
So just lose class='....' part and it will work, like so

<referenceBlock name="page.main.title" template="Vendor_Module::html/title.phtml" />

Also, i couldnt make it work with passing template as argument.

Best of luck

Answer 5

Seems like you can do both on latest version of Magento straight from a layout :

<referenceBlock name="customer_form_register" class="Vendor\Customer\Block\Form\Register">
 <action method="setTemplate">
 <argument name="template" xsi:type="string">Vendor_Customer::form/register.phtml</argument>
 </action>
</referenceBlock>