how do I create a static Instance in javascript

Questions & Answers
1

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 for where the C# script creates an ‘Instance’ to read and write vars from , I found the other scripts and stored them in local vars.:

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

Any help or info would be greatly appreciated.

This is the same as my other question , but it was answered with (helpful) information not specific to my question. http://answers.unity3d.com/questions/235181/help-with-creating-a-class-in-javascript.html

I shall remove the duplicate when I hopefully have an answer to help clean up the system. Thanks.

2

Just to clarify, static class and instances are opposite concepts. From the look of things, I’d say you’re interested in the Singleton pattern.

EDIT: Well you could either have a static class or a regular class with static variables. Here’s a quick example:

//MyScript.js
public class MyScript extends MonoBehaviour
{
    public static var myName:String = "By0log1c";
    public var myLocation:String = "Quebec, Canada";

}

//MyStaticScript.js
//static class must extend from object (just leave it blank)
public static class MyStaticScript
{
    //myAge is static since its within MyStaticScript
    public var myAge:int = 23;
}

//SomeScript.js
public class SomeScript extends MonoBehaviour
{
    function Start():void
    {
        Debug.Log(MyScript.myName); //MyScript.myName is static
        Debug.Log(MyStaticScript.myName); //MyStaticScript is static
    
        Debug.Log(MyScript.myLocation); //nothing static here = error!
    }

}

Frankly, the singleton pattern is what really taught me what static is. Here’s a JS example:

//let's combine the best of both world!
public class MySingleton extends MonoBehaviour
{
    private static var instance:MySingleton;
    public static function Instance():MySingleton
    {
        return instance;
    }

    var nonStaticVariable:boolean = false;

    function Awake():void
    {
        instance = this;
    }
}

//SomeScript.js
public class SomeScript extends MonoBehaviour
{
    function Start():Void
    {
        //we access MySingleton through its static Instance
        //function and use a MonoBehaviour like it was static!
        Debug.Log(MySingleton.Instance().nonStaticVariable);
    }
}

That’s a lot of reading but trust me, you’ll love singleton.

3

The JS equivalent of the C# code you posted is:

static var Instance : TP_Controller;

function Awake() {
    Instance = this;
}