gpnf-copy-parent-values-to-first-child-entry.js

/**
 * Gravity Perks // Nested Forms // Copy Parent Values To First Child Entry
 * https://gravitywiz.com/documentation/gravity-forms-nested-forms/
 *
 * Copy parent values into the first child entry automatically. The `{Parent}` merge tag would typically be used
 * for this but this would copy the values to all child entries, not just the first.
 */
gform.addAction( 'gpnf_init_nested_form', function( childFormId, gpnf ) {

	// Update "123" to your the ID of your child form.
	var targetChildFormId = 123;
	
	// Map fields from parent to child in the format
	// parent_field_id : child_field_id
	var fieldMap = {
		'2' : '2',
		'3' : '5',
		'4_3' : '6_3',
		'4_6' : '6_6'
	};


	if ( childFormId == targetChildFormId && gpnf['entries'].length == 0 ) {
		copyParentFormValue( GFFORMID, fieldMap, childFormId );
	}

} );

function copyParentFormValue( parentFormId, fieldMap, childFormId ) {
	
	Object.keys(fieldMap).forEach(key => {
	 	var value = jQuery ( '#input_{0}_{1}'.gformFormat( parentFormId, key ) ).val();

		// Delaying setting value so Populate Anything can pick up the change event.
		setTimeout( function() {
			$( '#input_' + childFormId + '_' + fieldMap[key] ).val( value ).change();
		} );
	});

}