How to play my jump animation?

So I wanna play my jump animation when the player is the air and when he presses space ONCE. It may sound simple but I can't figure out how to do this at all. Here's my code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEditor;
4. using UnityEngine;
5.  
6. public class PlayerMovement : MonoBehaviour
7. {
8.     //private variables
9.     private Rigidbody2D rb;
10.     bool IsGrounded = false;
11.  
12.     //public variables
13.     public float speed;
14.     public float jumpForce;
15.     public Transform GroundChecker;
16.     public float GroundRadius;
17.     public LayerMask GroundLayer;
18.     public float fallMultiplier = 2.5f;
19.     public float lowJumpMultiplier = 2f;
20.     public SpriteRenderer playerSprite;
21.     public Animator playerAnimator;
22.  
23.  
24.  
25.     void Start()
26.     {
27.         Input.GetAxisRaw("Horizontal");
28.         rb = GetComponent<Rigidbody2D>();
29.     }
30.  
31.     void Update()
32.     {
33.         Move();
34.         Jump();
35.         CheckForGround();
36.         BetterJump();
37.         AnimateSprite();
38.  
39.     }
40.  
41.     void Move()
42.     {
43.         float xHor = Input.GetAxisRaw("Horizontal");
44.         float MoveDir = xHor * speed;
45.         rb.velocity = new Vector2(MoveDir, rb.velocity.y);
46.     }
47.  
48.     void Jump()
49.     {
50.         if (Input.GetKeyDown(KeyCode.Space) && IsGrounded)
51.         {
52.             rb.velocity = new Vector2(rb.velocity.x, jumpForce);
53.         }
54.     }
55.  
56.     void CheckForGround()
57.     {
58.         Collider2D collider = Physics2D.OverlapCircle(GroundChecker.position, GroundRadius, GroundLayer);
59.  
60.         if (collider != null)
61.         {
62.             IsGrounded = true;
63.         }
64.         else
65.         {
66.             IsGrounded = false;
67.         }
68.     }
69.  
70.     void BetterJump()
71.     {
72.         if (rb.velocity.y < 0)
73.         {
74.             rb.velocity += Vector2.up * Physics2D.gravity * (fallMultiplier - 1) * Time.deltaTime;
75.         }
76.         else if (rb.velocity.y > 0 && !Input.GetKey(KeyCode.Space))
77.         {
78.             rb.velocity += Vector2.up * Physics2D.gravity * (lowJumpMultiplier - 1) * Time.deltaTime;
79.         }
80.     }
81.  
82.     void AnimateSprite()
83.     {
84.         if (Input.GetKey(KeyCode.A))
85.         {
86.             playerSprite.flipX = true;
87.             playerAnimator.Play("Run");
88.         }
89.         else if (Input.GetKey(KeyCode.D))
90.         {
91.             playerSprite.flipX = false;
92.             playerAnimator.Play("Run");
93.         }
94.         else
95.         {
96.             playerAnimator.Play("Idle");
97.         }
98.  
99.        
100.      
101.     }
102. }
103.  

Please bear with my messy code.

 

Code (CSharp):

1.  
2.  
3. void AnimateSprite()
4.   {
5.  
6.       if(!isGrounded)
7.        {
8.               //Play anim is in the air
9.        }
10.        else
11.        {
12.              //Stop the anim
13.        }
14.        if (Input.GetKey(KeyCode.A))
15.        {
16.           playerSprite.flipX = true;
17.             playerAnimator.Play("Run");
18.        }
19.         else if (Input.GetKey(KeyCode.D))
20.         {
21.            playerSprite.flipX = false;
22.            playerAnimator.Play("Run");
23.        }
24.         else
25.        {
26.            playerAnimator.Play("Idle");
27.         }
28.     }
29.  
30.  

Or you can use a trigger statement in your animator

 

Cool this works. Thanks!. although I have a problem. How do I stop an animation? The jump animation stays on if I move as soon as I hit the floor after jumping. :/

 

In your animator panel you can set a trigger. When you active a trigger it became true for one cycle of animation . You have to make the transition between jump an idle state