Double jump in a 2D game

I am attempting to give my player a double jump in my 2D game. All the stuff that is in comment form in the script is what I attempted to use to perform my double jump.

Code (CSharp):

1. void StateInAir()
2.     {
3.         HandleHorizontalInput ();
4.  
5.         if (canJump) {
6.             if (timeHoldingInput < maxJumpBtnHoldTime && Input.GetKey(KeyCode.Space))
7.             {
8.                 timeHoldingInput += Time.deltaTime;
9.                 GetComponent<Rigidbody2D> ().velocity += new Vector2 (0, thePlayer.JumpAccel ());
10. //                if(Input.GetKeyUp(KeyCode.Space) && doublejump == true)
11. //                {
12. //                    SetState(PlayerStates.ENTER_JUMP);
13. //                    if (timeHoldingInput < maxJumpBtnHoldTime && Input.GetKey (KeyCode.Space))
14. //                    {
15. //                        timeHoldingInput += Time.deltaTime;
16. //                        GetComponent<Rigidbody2D> ().velocity += new Vector2 (0, thePlayer.JumpAccel ());
17. //                        doublejump = false;
18. //                    }
19. //                }
20.             }
21. //            else if( doublejump == true)
22. //            {
23. //                timeHoldingInput = 0;
24. //                doublejump = false;
25. //            }
26.             else
27.             {
28.                 canJump = false;
29.                 //SetState(PlayerStates.IDLE);
30.             }
31.         }
32.         else
33.         {
34.             CheckForGround();
35.             if( onGround)
36.             {
37.                 HandleLandOnGround();
38.                 doublejump = true;
39.             }
40.         }
41.     }

 

Well, hard to say what's wrong with it having all those variables with unknown source/values.
canJump
maxJumpBtnHoldTime
doublejump
A good start would be to add some Debug.Log statements to see what are the actual values of those variables and if your double jump code does trigger.

 

Oh sorry. I didn't add the entire code thinking it would be easier for people to read what I am talking about, I guess not. Here are my variables. I will try the debug and see what happens.

Code (CSharp):

1. private enum PlayerStates
2.     {
3.         IDLE,
4.         RUN,
5.         ENTER_JUMP,
6.         IN_AIR,
7.  
8.         NUM_STATES
9.     }
10.    
11.     //Exposed Variables
12.     [SerializeField]
13.     private float maxJumpBtnHoldTime = 0.28f;
14.     [SerializeField]
15.     private float timeHoldingInput = 0.0f;
16.     [SerializeField]
17.     private Transform groundCheck;
18.     [SerializeField]
19.     private LayerMask walkableLayer;
20.     [SerializeField]
21.     private float groundCheckRadius = 0.1f;
22.     [SerializeField]
23.     private GameObject spawnPoint;
24.     //Private Variables
25.     Player thePlayer;
26.     PlayerStates curState;
27.     Dictionary<PlayerStates, Action> fsm = new Dictionary<PlayerStates, Action>();
28.  
29.     private bool canJump = true;
30.     private bool onGround = false;
31.     private int healthAmount = 100;
32.     private int damageAmount= 0;
33.     private bool doublejump = true;