Problem using a level NPC that's joined to a class

[fowlplay4]

Here's one way of doing it, you assign a shop id to your npc.

I.e: this.shop_id = "basicshop";

PHP Code:

function onCreated() {
  this.shop_id = "basicshop";
  this.join("shopkeeper");
} 


DB-NPC: DB_Shops (For this example)

PHP Code:

function onCreated() {
  // Setup Basic Shop's Item List
  this.shop_basicshop = {
    {"Fireball", "split_fireball", "split_fireball.png", "split_fireball_selected.png", 30}, 
    {"Sword", "split_sword", "split_sword.png", "split_sword_selected.png", 20},
    {"Bow", "split_bow", "split_bow.png", "split_bow_selected.png", 10}
  };
}

// Public method to retrieve the items for a specific shop
public function getShopItems(shop_id) {
  return this.("shop_" @ shop_id);
} 


then in your NPC:

PHP Code:

// other code..

function getShopItems() {
  return DB_Shops.getShopItems(this.shop_id);
}

function onPlayerTouchsMe() {
  // You don't need to specify "gui", you can just use the weapon's name.
  player.triggerclient("-shopcontrol", this.shop_id, getShopItems(), this.x, this.y);
} 


Then in your script you can just store the shop id, and display the items, and then trigger your DB-NPC, verify the purchase against the list of items for that shop, and allow the player to purchase the item.