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    Add custom form elements in product add/edit form in specific group section in Magento 2

    Here we’ll learn how to add custom form elements in product add/edit form in specific group section in Magento 2

    Using magento2 ‘adminhtml_catalog_product_edit_prepare_form’  observer we can add custom form elements in product add/edit form.

    1# First we’ll define observer (event) in event.xml file at folder app/code/NameSpace/ModuleName/etc/adminhtml

    <?xml version="1.0"?>
    <!--
    /**
     * Webkul Admin events
     *
     * @category    Webkul
     * @author      Webkul Software Private Limited
     *
     */
    -->
    <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
        <event name="adminhtml_catalog_product_edit_prepare_form">
            <observer name="custom_product_fields" instance="NameSpace\ModuleName\Observer\CatalogProductEditPrepareForm" />
            <!-- CatalogProductEditPrepareForm is name of class in which we'll add custom fields in form-->
        </event>
    </config>
    

    2# Now create CatalogProductEditPrepareForm.php class file in app/code/NameSpace/ModuleName/Observer

    <?php
    /**
     * @category    Webkul
     * @author      Webkul Software Pvt. Ltd.
     */
    namespace NameSpace\ModuleName\Observer;
    
    use Magento\Framework\Event\ObserverInterface;
    
    class CatalogProductEditPrepareForm implements ObserverInterface
    {
    	/**
         * @var \Magento\Framework\Registry
        */
        protected $_coreRegistry;
    
        /**
         * @param \Magento\Framework\Registry  $coreRegistry
         */
        public function __construct(
            \Magento\Framework\Registry  $coreRegistry
        ) {
            $this->_coreRegistry = $coreRegistry;
        }
    
        /**
         * product from prepare event handler.
         * @param \Magento\Framework\Event\Observer $observer
         * @return $this
         */
        public function execute(\Magento\Framework\Event\Observer $observer)
        {  
            $form = $observer->getForm(); // $observer contain form object
    
            // get your group element in which you want to add custom filed
            $fieldset = $form->getElement('group-fields-id-in-which-you-want-to-add-elements'); 
    
            if ($fieldset) {
    
                // get current product if you want to use any data from product
                $product = $this->_coreRegistry->registry('product');
                $fieldset ->addField(
                    'custom-field-1',
                    'text',
                    [
                        'name' => 'custom-field-1',
                        'label' => __('Custom Field 1'),
                        'id' => 'custom-field-1'
                    ]
                );
    
                $fieldset ->addField(
                    'custom-field-2',
                    'text',
                    [
                        'name' => 'custom-field-2',
                        'label' => __('Custom Field 2'),
                        'id' => 'custom-field-2'
                    ]
                );
    
                // You can set any data in these elements for display default value
                $form->addValues(
                    [
                        'custom-field-1' => 'data according to you', // ex. $product->getName()
                        'custom-field-2' => 'data according to you'
                    ]
                );
            }
            return $this;
        }
    }
    

    Note:- its use for display data on form and you can get data on submit but Data will not save with product …

    . . .
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