Adding Template File
sales_order_view.xml
<?xml version="1.0"?> <page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="admin-2columns-left" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd"> <body> <referenceBlock name="order_info"> <block class="LearningRewriteSalesBlockAdminhtmlOrderViewCustom" name="sales_order_view_custom" template="order/view/custom.phtml" /> </referenceBlock> </body> </page>
Other Method
Learning/RewriteSales/Block/Adminhtml/Order/View/Custom.php
<?php
namespace LearningRewriteSalesBlockAdminhtmlOrderView;
class Custom extends MagentoBackendBlockTemplate
{
}
Learning/RewriteSales/view/adminhtml/layout/sales_order_view.xml
<?xml version="1.0"?> <page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="admin-2columns-left" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd"> <body> <referenceBlock name="order_info"> <block class="LearningRewriteSalesBlockAdminhtmlOrderViewCustom" name="sales_order_view_custom" template="order/view/custom.phtml" /> </referenceBlock> </body> </page> Learning/RewriteSales/view/adminhtml/templates/order/view/custom.phtml
<h1>Hi, I am here!</h1>
clear the cache and run it.