Unity2d Jumping like teleport - unity3d

Question

I am working on Unity2d Sprite but something is wrong: in my code when I press the jump button my character jump like teleport, it go very fast in the Up direction. The gravity is 9 and my Rigidbody2D mass is 1. My code is this:
if(isGrounded == true && moveH == 0) {
if (Input.GetKeyDown(KeyCode.J)) {
anim.SetBool("str_jump", true);
//rgBody.velocity = new Vector2(0,jumpHeight);
//rgBody.AddForce(Vector2.up * jumpHeight);
transform.position = new Vector2(transform.position.x,
transform.position.y * jumpHeight);
isGrounded = false;
}
}

Answer 1

If your jump is too high, you have to use a variable to modify the height of the jump. In your case, you are using the jumpHeight as the variable to modify the height of your jump.
Decreasing jumpHeight should solve your problem. Note that if jumpHeight is declared as public (public float jumpHeight;), you have to change the variable from the Editor or a function because it will not use the number assigned to it when it was declared. It will use whatever that is assigned to it from the Editor.
For example, when you have public float jumpHeight = 4; but the value is set to 0 in the editor, 0 will be used as the value not 4.
Also you have to use rgBody.AddForce(Vector2.up * jumpHeight);. Uncomment it and then remove the transform.position = new Vector2(transform.position.x,transform.position.y *jumpHeight); line of code.
If this does not solve your problem, then you have to update your question with your complete code.

Answer 2

For a nice jump you could also use rgBody.AddForce((Vector2.up * jumpHeight), ForceMode2D.Impulse); It simulates an impact on your object and you get a nice jump simulation.
Do not forget to declare the public float jumpHeigt = 4f; like "Programmer" said it before.
I hope it will help you.

Answer 3

Simply reducing the jumpHeight value will fix the initial issue of the jump being too high.
However if you want a more realistic 'jump' you may want to utilise Rigidbody2D.velocity simply having rgBody.velocity = new Vector2(rgBody.velocity.x, jumpHeight); should create a nice smooth jump.
If you use the Rigidbody2D.velocity instead of simply changing the transform means that you can alter values such as Gravity Scale and this will make a noticeable difference on the movement of your player. You can play around with different jumpHeight and Gravity Scale values to find what works best for your game.

Answer 4

Use transform.position '+=' instead of just '='. This way you're adding to it's position and not setting it to a certain number(that's why it's teleporting like that). Tho this method only suits horizontal movement in my opinion(if it's a sideview game). For jumping, using AddForce would be way better.