Can't Jump?

programming
1

For some reason my character can’t jump. I’ve spent a good our trying to debug, and still no luck. Can anyone help?


ySpeed = ySpeed + gravity; //increment gravity on player


if (Key.isDown(JUMP) && playerState != "jumping") {
	//if the player presses the JUMP key and is not jumping
	playerState = "jumping"; //set player's state to jumping
	ySpeed = ySpeed - jumpPower; //give player initial thrust when jumping
}


for (var i:Number = 0; i < _parent.groundArray.length; i++) {
	//scroll through each ground instance to check if we're touching it
	if (_parent[_parent.groundArray*].hitTest(this._x, this._y, true)) {
		//if we are touching the ground
		playerState = "standing"; //set player's state to standing
	}

	while (_parent[_parent.groundArray*].hitTest(this._x, this._y, true)) {
		//if we are touching the ground
		this._y--; //push player up so the player doesn't fall through the ground
		ySpeed = 0; //reset player's y-axis speed so player doesn't go through ground
	}

	if (_parent[_parent.groundArray*].hitTest(this._x, this._y - this[_parent.hitBox]._height + (this._height / 4), true)) {
		//if the player's head (top part of player) is touching a platform
		ySpeed = gravity; //push player back so player doesn't go through ground
	}
}

Thanks for any help!
-Mike