diff --git a/public/ddown/dropdown.php b/public/ddown/dropdown.php
index 578f25e..382a7de 100644
--- a/public/ddown/dropdown.php
+++ b/public/ddown/dropdown.php
@@ -1,8 +1,8 @@
-<?php 
+<?php
 
-Class Dropdown
+class Dropdown
 {
-	
+
 	private $host = 'localhost';
 	private $username = 'solocla';
 	private $password = '!Massarosa2';
@@ -11,20 +11,17 @@ Class Dropdown
 
 	//establish connection
 	public function __construct()
-	
+
 	{
-		
-		try 
-		{
+
+		try {
 			$this->connection = new mysqli($this->host, $this->username, $this->password, $this->dbname);
-		} 
-		catch (Exception $e) 
-		{
+		} catch (Exception $e) {
 			echo "Connection error " . $e->getMessage();
 		}
 	}
 
-	
+
 	//fetch all country records from database
 	public function fetchCountry()
 	{
@@ -32,53 +29,56 @@ Class Dropdown
 
 		$query = "SELECT * FROM article_type ORDER BY article_type.name_articletype";
 
-		if ($sql = $this->connection->query($query)) 
-		{
-			while ($rows = mysqli_fetch_assoc($sql)) 
-			{
+		if ($sql = $this->connection->query($query)) {
+			while ($rows = mysqli_fetch_assoc($sql)) {
 				$data[] = $rows;
 			}
 		}
 
 		return $data;
 	}
-	
+
 	//fetch model records from database depend upon country id
 	public function fetchModel($idarticletype)
 	{
 		$data = null;
 
-		$query = "SELECT * FROM modelarticle WHERE idarticletype='".$idarticletype."' ";
+		$query = "SELECT * FROM modelarticle WHERE idarticletype='" . $idarticletype . "' ";
 
-		if ($sql = $this->connection->query($query)) 
-		{
-			while ($rows = mysqli_fetch_assoc($sql)) 
-			{
+		if ($sql = $this->connection->query($query)) {
+			while ($rows = mysqli_fetch_assoc($sql)) {
 				$data[] = $rows;
 			}
 		}
 
 		return $data;
 	}
-	
+
 	//fetch Charact records from database depend on article type
 	public function fetchCharact($idarticletype)
 	{
 		$data = null;
 
-		$query = "SELECT * FROM article_characteristic WHERE idarticletype='".$idarticletype."' ";
+		$idarticletype = (int)$idarticletype;
 
-		if ($sql = $this->connection->query($query)) 
-		{
-			while ($rows = mysqli_fetch_assoc($sql)) 
-			{
+		$query = "
+        SELECT DISTINCT 
+            ac.*
+        FROM article_characteristic ac
+        INNER JOIN standards s
+            ON s.idarticlecharacteristic = ac.idarticlecharacteristic
+           AND s.idarticletype = ac.idarticletype
+        WHERE ac.idarticletype = $idarticletype
+          AND s.active = 'Y'
+        ORDER BY ac.name_articlecharacteristic
+    ";
+
+		if ($sql = $this->connection->query($query)) {
+			while ($rows = mysqli_fetch_assoc($sql)) {
 				$data[] = $rows;
 			}
 		}
 
 		return $data;
 	}
-
 }
-
- ?>
\ No newline at end of file