I can only jump once on my jump code C#

Questions & Answers
1

In my jump script there is a statement that says, if not grounded and moving along the y axis, grounded = true however, this statement doesn’t seem to be active.

using UnityEngine;
using System.Collections;

public class Jump : MonoBehaviour {
	public bool grounded = true;
	public float jumpPower = 50000;
	// Use this for initialization
	void Start () {
		grounded = true;
	}

	void Update () {
		if(!grounded && GetComponent<Rigidbody2D>().velocity.y == 0) {
			grounded = true;
		}
		if (Input.GetButtonDown("Jump") && grounded == true) {
			GetComponent<Rigidbody2D>().AddForce(transform.up*jumpPower);
			grounded = false;
		}
	}
}

Is there something wrong within my script? The problem is that I can only jump once.

2

Better use raycast instead of checking the velocity. Its more accurate.

  If(Physics.Raycast(transform.position-transform.localscale/2, Vectore3.Down, 0.1f)
//IsGrounded = true;
3

You can use the method called OnCollisionEnter2D.

As long as your ground has a tag set to Ground, which can be done at the top of the inspector, this script works.

Here is an example jump script that works perfectly :

using UnityEngine;
using System.Collections;

public class playerMovement : MonoBehaviour {

public float jumpSpeed = 50f;
public bool grounded = false;

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {
		if (grounded) {
			if (Input.GetKey (KeyCode.Space)) {
				GetComponent<Rigidbody2D> ().AddForce (Vector2.up * jumpSpeed);
				grounded = false;
			}
		}
	}

void OnCollisionEnter2D (Collision2D other){
	if (other.transform.tag == "Ground") {
		grounded = true;
	}
}

}