Why my character wont jump???

Questions & Answers
1

Code:

	var speed : float = 6.0;
	var jumpSpeed : float = 8.0;
	var gravity : float = 20.0;
	var AirSpeed : float = 0.25;
	
	var FireParticle : GameObject;
	
	private var moveDirection : Vector3 = Vector3.zero;
	
	function Update() {
	    
	    animation.CrossFade("Idle");
	
		var controller : CharacterController = GetComponent(CharacterController);
		
		transform.Rotate(0,Input.GetAxis("Horizontal"),0);
		
		if(Input.GetAxis("Vertical")){
		animation.CrossFade("Run");
		animation["Run"].speed = Input.GetAxis("Vertical")*3;
		}
			moveDirection = Vector3(0,0,Input.GetAxis("Vertical"));
			moveDirection = transform.TransformDirection(moveDirection);
			moveDirection *= speed;
		if (controller.isGrounded) {
			if (Input.GetKey(KeyCode.Space) && controller.isGrounded) {
				moveDirection.y = jumpSpeed;
			}
		}

		moveDirection.y -= gravity * Time.deltaTime;
		

		controller.Move(moveDirection * Time.deltaTime);
	}
2

Hi Once replace some line of your code and try may it work

if (controller.isGrounded) {
        Debug.Log("Check character is On Ground...");
         if (Input.GetKey(KeyCode.Space) {
          moveDirection.y = jumpSpeed;
         }
else
    moveDirection.y -= gravity * Time.deltaTime;