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Editing: config.php

<?php
add_filter( 'stm_nav_menu_item_additional_fields', 'mytheme_menu_item_additional_fields' );
function mytheme_menu_item_additional_fields( $fields ) {

$fields['stm_mega'] = array(
		'name'            => 'stm_mega',
		'label'           => __( 'Megamenu type', 'stm-megamenu' ),
		'wrap'            => 'stm_visible_lvl_0',
		'container_class' => 'stm_mega stm_megamenu_select',
		'input_type'      => 'select',
		'options'         => array(
			'disabled' => __( 'Disabled', 'stm-megamenu' ),
			'boxed'    => __( 'Boxed', 'stm-megamenu' ),
		),
	);

$fields['stm_menu_logo'] = array(
		'name'            => 'stm_menu_logo',
		'label'           => __( 'Megamenu use logo', 'stm-megamenu' ),
		'wrap'            => 'stm_visible_lvl_0',
		'container_class' => 'stm_menu_logo',
		'input_type'      => 'stm_mega_logo',
	);

$fields['stm_menu_icon'] = array(
		'name'            => 'stm_menu_icon',
		'label'           => __( 'Megamenu icon', 'stm-megamenu' ),
		'wrap'            => 'stm_visible_lvl_1 stm_visible_lvl_2',
		'container_class' => 'stm_mega_icon',
		'input_type'      => 'text',
	);

$fields['stm_child_menu_use_post'] = array(
		'name'            => 'stm_child_menu_use_post',
		'label'           => __( 'SubMenu Use PostId', 'stm-megamenu' ),
		'wrap'            => 'stm_visible_lvl_0',
		'container_class' => 'stm_child_menu_use_post',
		'input_type'      => 'checkbox',
	);

$fields['stm_menu_as_title'] = array(
		'name'            => 'stm_menu_as_title',
		'label'           => __( 'Menu As Title', 'stm-megamenu' ),
		'wrap'            => 'stm_visible_lvl_1',
		'container_class' => 'stm_menu_as_title',
		'input_type'      => 'checkbox',
	);

$fields['stm_menu_show_special_offer'] = array(
		'name'            => 'stm_menu_show_special_offer',
		'label'           => __( 'Show Special Offers', 'stm-megamenu' ),
		'wrap'            => 'stm_visible_lvl_1',
		'container_class' => 'stm_menu_show_special_offer',
		'input_type'      => 'checkbox',
	);

$fields['stm_menu_image'] = array(
		'name'            => 'stm_menu_image',
		'label'           => __( 'Megamenu image', 'stm-megamenu' ),
		'new'             => __( 'Add image', 'stm-megamenu' ),
		'delete'          => __( 'Remove image', 'stm-megamenu' ),
		'replace'         => __( 'Replace image', 'stm-megamenu' ),
		'wrap'            => 'stm_visible_lvl_1 stm_visible_lvl_2',
		'container_class' => 'stm_mega_image',
		'input_type'      => 'image',
	);

$fields['stm_mega_textarea'] = array(
		'name'            => 'stm_mega_textarea',
		'label'           => __( 'Megamenu textarea', 'stm-megamenu' ),
		'wrap'            => 'stm_visible_lvl_2',
		'container_class' => 'stm_mega_textarea',
		'input_type'      => 'textarea',
	);

$fields['stm_menu_bg'] = array(
		'name'            => 'stm_menu_bg',
		'label'           => __( 'Megamenu background', 'stm-megamenu' ),
		'new'             => __( 'Add image', 'stm-megamenu' ),
		'delete'          => __( 'Remove image', 'stm-megamenu' ),
		'replace'         => __( 'Replace image', 'stm-megamenu' ),
		'wrap'            => 'stm_visible_lvl_0',
		'container_class' => 'stm_menu_bg',
		'input_type'      => 'image',
	);

$fields['stm_mega_text_repeater'] = array(
		'name'            => 'stm_mega_text_repeater',
		'label'           => __( 'Megamenu text repeater', 'stm-megamenu' ),
		'wrap'            => 'stm_visible_lvl_1',
		'container_class' => 'stm_mega_text_repeater',
		'input_type'      => 'repeater',
	);

return $fields;
}

if ( ! function_exists( 'stm_mm_get_menu_data' ) ) {
	function stm_mm_get_menu_data() {
		// Get event details
		$json           = array();
		$json['errors'] = array();

$_POST['postId'] = filter_var( $_POST['postId'], FILTER_VALIDATE_INT );

if ( empty( $_POST['postId'] ) ) {
			return false;
		}

$menu_icon_data = get_post_meta( $_POST['postId'], '_menu_item_stm_menu_icon_repeater' );
		$menu_text_data = get_post_meta( $_POST['postId'], '_menu_item_stm_menu_text_repeater' );

$data = array();

if ( ! empty( $menu_icon_data[0] ) ) {
			$data['icons'] = json_decode( $menu_icon_data[0] );
		}

if ( ! empty( $menu_text_data[0] ) ) {
			$data['text'] = json_decode( $menu_text_data[0] );
		}

echo json_encode( $data );
		exit;
	}
}

add_action( 'wp_ajax_stm_mm_get_menu_data', 'stm_mm_get_menu_data' );

add_action( 'admin_footer', 'setTemplateRepeater' );
function setTemplateRepeater() {
	echo '<script id="repItem" type="text/template">
			<div class="mega-repeater-view">
				<input type="text" id="<%= icoId %>" class="widefat code edit-menu-item-stm_menu_icon_repeater" name="<%= icoName %>" value="<%= icoValue %>">
				<input type="text" id="<%= textId %>" class="widefat code edit-menu-item-stm_menu_text_repeater" name="<%= textName %>" value="<%= textValue %>">
				<div class="edit-menu-repeater-controls">
					<i class="fas fa-plus-square mm-plus" aria-hidden="true" data-id="<%= plusPosition %>"></i>
					<i class="fas fa-minus-square mm-minus" aria-hidden="true" data-id="<%= minusPosition %>"></i>
				</div>
			</div>				
		</script>';
}

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