Inventory UI buttons not working

Question

Hi. I made an inventory system made of a gameObject named Inventory with its script, a box that show current selected item and arrows to scroll through the List<> of items. The problem here is that there's no response when any button is clicked. Nothing. I cannot switch items or use them. Inventory.cs :

 using UnityEngine;
 using System.Collections.Generic;
 using UnityEngine.UI;
 using TMPro;
 
 public class Inventory : MonoBehaviour
 {
 
     public List<Item> content = new List<Item>();
     public int contentCurrentIndex = 0;
     public Image itemImageUI;
     public TextMeshProUGUI itemNameUI;
     public Sprite emptyItemImage;
 
     public PlayerEffects playerEffects; // attached to player
 
     public static Inventory instance;
 
     private void Awake()
     {
         if(instance != null)
         {
             Debug.LogWarning("Il y a plus d'une instance de Inventory dans la scène");
             return;
         }
 
         instance = this;
     }
 
     private void Start()
     {
         UpdateInventoryUI();
     }
 
     public void ConsumeItem()
     {
         if(content.Count == 0)
         {
             return;
         }
 
         Item currentItem = content[contentCurrentIndex];
         PlayerHealth.instance.HealPlayer(currentItem.hpGiven);
         playerEffects.AddSpeed(currentItem.speedGiven, currentItem.speedDuration);
         content.Remove(currentItem);
         GetNextItem();
         UpdateInventoryUI();
     }
 
     public void GetNextItem()
     {
         if (content.Count == 0)
         {
             return;
         }
 
         contentCurrentIndex++;
         if(contentCurrentIndex > content.Count - 1)
         {
             contentCurrentIndex = 0;
         }
         UpdateInventoryUI();
     }
 
     public void GetPreviousItem()
     {
         if(content.Count == 0)
         {
             return;
         }
 
         contentCurrentIndex--;
         if(contentCurrentIndex < 0)
         {
             contentCurrentIndex = content.Count - 1;
         }
         UpdateInventoryUI();
     }
 
     public void UpdateInventoryUI()
     {
         if(content.Count > 0)
         {
             itemImageUI.sprite = content[contentCurrentIndex].image;
             itemNameUI.text = content[contentCurrentIndex].name;
         }
         else
         {
             itemImageUI.sprite = emptyItemImage;
             itemNameUI.text = "";
         }
         
     }
 }

Hierarchy : alt text

All buttons have their functions defined :

alt text

Answer 1

Answer by jeffstaples1982 · Jul 29, 2021 at 04:16 AM

@Nakoru The OnClick for the button needs to reference a GameObject with that script on it, if you use just a script nothing will happen. If you dont have the inventory script on an object you can just create an empty gameobject and throw it on it.

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Nakoru · Jul 29, 2021 at 05:34 AM 0

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The script is already attached to an empty gameObject, yet it doesn't work :/

jeffstaples1982 Nakoru · Jul 30, 2021 at 06:12 AM 0

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I built your entire script in a test environment and your script works perfectly fine, I was able to consume items and go through them. The issue has to be with the buttons, all I did was create the buttons and drag the Inventory GameObject to the buttons OnClick.

I did add your Item class to the Inventory script and made a few items in the inspector to test...can you see items on your screen?

I added this at the end of your Inventory script

 [System.Serializable]
 public class Item
 {
     public string name;
     public int speedGiven;
     public int speedDuration;
     public Sprite image;
     public int hpGiven;
 }

BTW for the testing I did remove a few lines that was irrelevant but nothing that impacted the script, it was just item stuff

Inventory UI buttons not working

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