Prevent Player from Moving During Jump

Question

I am new to Unity, and am trying to make a simple 2D platformer from this video, and I am trying to modify it to prevent the player from being able to switch directions during a jump. Right now, you can jump and then move. I want to freeze the left/right player controls and give control of the players location FULLY to the rigidbody. Can anyone help? I can update with any additional info y'all need.

Here is my player controller script:

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

public class PlayerController : MonoBehaviour
{
    private Rigidbody2D rb;
    public float speed;
    public float jumpForce;
    private float moveInput;

    private bool isGrounded;
    public Transform feetPos;
    public float checkRadius;
    public LayerMask whatIsGround;
    private bool upKeyPressed;
    private bool upKeyHeld;
    private bool upKeyUp;

    private float jumpTimeCounter;
    public float jumpTime;
    private bool isJumping;

    
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    void FixedUpdate()
    {
        moveInput = Input.GetAxisRaw("Horizontal");
        rb.velocity = new Vector2(moveInput * speed, rb.velocity.y);
    }

    void Update() {
        isGrounded = Physics2D.OverlapCircle(feetPos.position, checkRadius, whatIsGround);

        upKeyPressed = Input.GetKeyDown(KeyCode.W) || Input.GetKeyDown(KeyCode.UpArrow);
        upKeyHeld = Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.UpArrow);
        upKeyUp = Input.GetKeyUp(KeyCode.W) && Input.GetKeyUp(KeyCode.UpArrow);

        if(moveInput > 0 && isGrounded == true) {
            transform.eulerAngles = new Vector3(0, 0, 0);
        } else if(moveInput < 0 && isGrounded == true) {
            transform.eulerAngles = new Vector3(0, 180, 0);
        }

        if(isGrounded == true && upKeyPressed) {
            isJumping = true;
            jumpTimeCounter = jumpTime;
            rb.velocity = Vector2.up * jumpForce;
        }
        
        if(upKeyHeld && isJumping == true) {

            if(jumpTimeCounter > 0) {
                rb.velocity = Vector2.up * jumpForce;
                jumpTimeCounter -= Time.deltaTime;
            } else {
                isJumping = false;
            }
            
        }

        if(Input.GetKeyUp(KeyCode.UpArrow)) {
            isJumping = false;
        }
    }
}
```

Answer 1

Did you try checking whether you're grounded before applying the horizontal input to the velocity?

(You should also be applying your jump hold logic at the same time, not in Update, so held jumps are handled consistently regardless of framerate)

void FixedUpdate()
{
    Vector2 newVelocity = rb.velocity;

    isGrounded = Physics2D.OverlapCircle(feetPos.position, checkRadius, whatIsGround);
    if (isGrounded) {
        moveInput = Input.GetAxisRaw("Horizontal");
        newVelocity.x = moveInput * speed;
    }

    if (isJumping) {
        upKeyHeld = Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.UpArrow);

        if(upKeyHeld) {
            if(jumpTimeCounter > 0) {
                // Don't name a variable "force" if it's measuring "speed".
                newVelocity.y = jumpSpeed;
                jumpTimeCounter -= Time.deltaTime;
            } else {
                isJumping = false;
            }            
        }
    }

    rb.velocity = newVelocity;
}

You'll probably also want to change your jumping lift-off code so that it doesn't reset the horizontal velocity to zero:

if(isGrounded == true && upKeyPressed) {
    isJumping = true;
    jumpTimeCounter = jumpTime;
    rb.velocity = new Vector2(rb.velocity.x, jumpSpeed);
}