Animation plays but character isn't jumping

I'm trying to use character controller to jump. Jump animation plays like it should but the character doesn't go up at all.

Here's the script, so if someone can tell me what's wrong with the script and how to fix it, please do.

 using UnityEngine;
 using System.Collections;
 using System;
 
 public class DummyCharJump : MonoBehaviour {
 
     public bool onGround;
     public float minJump;
     public float delayTime = 0.5f;
     private bool allowJump = true;
     public float jumpSpeed = 10F;
     public float gravity = 20.0F;
     public Rigidbody rbody;
     
     private Vector3 moveDirection = Vector3.zero;
 
     
     // Use this for initialization
     void Start ()
     {
         onGround = true;
         minJump = Stats.DummyJMP;
         rbody = GetComponent<Rigidbody>();
 
     }
 
     // Update is called once per frame
     void Update()
     {
 
 
 
         if (onGround && Input.GetButtonDown("Jump"))
         {
             //Call Delay
             StartCoroutine(JumpDelay());
         }
 
         //holding jump button//
 
 
 
         if (allowJump && onGround)
         { 
             
             CharacterController controller = GetComponent<CharacterController>();
 
             if (controller.isGrounded) {
                 moveDirection = new Vector3();
                 moveDirection = transform.TransformDirection(moveDirection);
                 if (Input.GetButton ("Jump"))
                     moveDirection.y = jumpSpeed * minJump;
         }
                 
           
             
         }
     }
 
     //Delay then enable Jump
     private IEnumerator JumpDelay()
     {
        
         yield return new WaitForSeconds(delayTime);
         allowJump = true;
     }
 
 
 
     void OnCollisionEnter(Collision other)
     {
         if(other.gameObject.CompareTag("ground"))
         {
             onGround = true;
         }
     }
 
 
 }