help with creating a static Instance in javascript

Question

// -- Amended Question --

I have successfully rewritten a Third Person Controller tutorial on 3D Buzz from C# to JavaScript, with one major exception. Where the C# script creates an 'Instance' to read and write vars from , I found the other scripts and stored them in local vars. This is going to give me future problems so I would like to finally find out :

How do I create an 'Instance' in JavaScript for my other scripts to reference ?

C# example :

 using UnityEngine;
 using System.Collections;
 
 public class TP_Controller : MonoBehaviour 
 {   
     public static TP_Controller Instance;
 
     void Awake() {
         Instance = this;
     }
 }

My js workaround :

 public var TP_Motor : Script_TP_Motor;
 function Awake() {
     TP_Motor = GetComponent("Script_TP_Motor");
 }

Any help or info would be greatly appreciated.

// Thanks , Jay.

//

// ---- First Posted Question ----

I am following the Third Person Controller videos on 3D Buzz, but they are written in C#. My goal is to follow the video's and write the code in JavaScript.

From what I understand that I am trying to do, is establish a set of vars to live in a 'class' , then I should create an instance of this class, for other scripts to access vars or adjust vars.

In my previous projects, to read/edit other scripts' data I have simply assigned a e.g. var myTPC : ScriptTPC; and used GetComponent in the Start to load the script.

So before I start; can someone please help me understand what is being set up in this C# script :

 using UnityEngine;
 using System.Collections;
 
 public class TP_Controller : MonoBehaviour 
 {    
     public static CharacterController myCharacterController;
     public static TP_Controller Instance;
 
     void Awake() 
     {
         myCharacterController = GetComponent("CharacterController") as CharacterController;
         Instance = this;
     }
 }

and how can I edit my converted javascript to use class and assign Instance :

 #pragma strict
 
 public static var myCharacterController : CharacterController;
 public static var TP_Controller : Instance;
 
 function Awake() 
 {
     myCharacterController = GetComponent("CharacterController");
     Instance = this;
 }

Many thanks, I am self-taught so alot of the terminology is lost on me.

3D Buzz link : http://www.3dbuzz.com/vbforum/content.php?212

Scroll down to -> Section 2 ; Video 6 - TP_Controller Skeleton

Edit 1 : I understand I have to load CharacterController , and this actually loads preset functions I can call on (TransformDirection , Move, IsGrounded etc) , I don't understand how to create an 'Instance' that all scripts can call on. My method would be to load the other scripts into a var then edit e.g. var myTPC : ScriptTPC; myTPC.posX = 1; (would change the posX var on ScriptTPC to 1). Can I just do this instead of creating an Instance?

Edit 2 : So far my scripts are working , using a different method of reading and writing to each other. Although I do get a Warning : BCW0028: WARNING: Implicit downcast :

 public var myCharacterController : CharacterController;
 // public static var TP_Controller : Instance;
 public var TP_Motor : Script_TP_Motor;
 
 function Awake() 
 {
     myCharacterController = GetComponent("CharacterController");
     // Instance = this;
     TP_Motor = GetComponent("Script_TP_Motor"); // Warning , even with using -> OR transform.gameObject.GetCo... OR this.GetCo...
 }

and I'll have to do the same for the TP_Camera script

Answer 1

Best Answer

Answer by AlucardJay · Apr 06, 2012 at 02:10 AM

Answered on this Question :

http://answers.unity3d.com/questions/235417/how-do-i-create-a-static-instance-in-javascript.html

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Answer 2

Answer by kalvinlyle · Apr 04, 2012 at 09:17 AM

 using UnityEngine;
 using System.Collections;
 
 public class TP_Controller : MonoBehaviour 
 {   
     public static CharacterController myCharacterController;       //sets a variable of type CharacterController
     public static TP_Controller Instance;                                      //sets a variable of type TP_Controller (this script)

     //Happens only once when the script is first created
     void Awake()
     {
        //Assigns the CharacterController component to a varaiable so it can be called by this script
        //the Get Component function will look for the component on the object to which this script is attached
        myCharacterController = GetComponent("CharacterController") as CharacterController; 

        //set this script to a variable.  I'm not sure why you would want to do this, it doesn't make any sense
        Instance = this;
     }

    //code in the Update method happens every frame
     void Update()
     {
        //if there is no camara then skip the update
        if (Camera.mainCamera == null)
          return;


        //calls the GetLocomotionInput method (see below)
        GetLocomotionInput();
     }

     //this function is where the control of the character would happen
     void GetLocomotionInput() 
     {
 
     }
 }

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AlucardJay · Apr 04, 2012 at 09:30 AM 0

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Thanks for taking the time to show what the C# is doing. I should have explained better that I want to make the static (only one) Instance using JavaScript.

So far my scripts are working , using a different method of reading and writing to each other :

 public var myCharacterController : CharacterController;
 // public static var TP_Controller : Instance;
 public var TP_$$anonymous$$otor : Script_TP_$$anonymous$$otor;
 
 function Awake() 
 {
     myCharacterController = GetComponent("CharacterController");
     // Instance = this;
     TP_$$anonymous$$otor = GetComponent("Script_TP_$$anonymous$$otor"); // Warning , even with using -> OR transform.gameObject.GetCo... OR this.GetCo...
 }

and I'll have to do the same for the TP_Camera script

help with creating a static Instance in javascript

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