My Character controller keeps jumping infinitely

Questions & Answers
1

I have followed an old unfinished tutorial to try and learn C# and I got the character controller working but when i jump my character controller infinitely jumping. i have tried multiple things but nothing has worked. i’m not asking for people to do it for me, i want an explanation on how to make it work properly.

thanks in advance.

here is my code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMov : MonoBehaviour {

public Transform playertrn;
public Rigidbody playerRB;
public int speed;
private bool isFalling = false;
private bool doubleJump = false;
public Vector3 JumpHeight = new Vector3 (0, 8, 0);

void Start () 
{
	playertrn = GetComponent<Transform> ();
	playerRB = GetComponent<Rigidbody> ();
	Physics.gravity = new Vector3(0, -15.0F, 0);
}


void Update () 
{
	if (Input.GetKey (KeyCode.D)) 
	{	
		playertrn.Translate (new Vector3(speed, 0, 0) * speed * Time.deltaTime);
	}

	if (Input.GetKey (KeyCode.A)) 
	{
		playertrn.Translate (new Vector3 (-speed, 0, 0) * speed * Time.deltaTime);
	}

	if (Input.GetKey (KeyCode.Space)) 
	{
		playerRB.velocity = JumpHeight;
		isFalling = true;
	}

}
void OnCollisionStay ()
{
isFalling = false;
}
}

2

Change Input.GetKey to Input.GetKeyUp

3

if (Input.GetKey (KeyCode.Space) && !isFalling)
{
playerRB.velocity = JumpHeight;
isFalling = true;
}

Change this part like this.