How can i add the random jump?

random jump working fine while i press the jump button its come randomly but after finish the one jump other jump took place automatically without pressing jump button.how can i solve this problem.

  code here
 
 using UnityEngine;
 using System.Collections;
 
 public class jump: MonoBehaviour {
 
 string[]  animatorparameters = {"jump_01","jump_02"};
 protected Animator animator;
 
 
 
 void Start () 
     {      
 
         animator = GetComponent<Animator>();
         
         }
 
 
 Void Update(){
          OnJump();
 
 }
 
 
 
 
 
 
 void OnJump()
     {
         int randomJumpAnim = Random.Range(0, animatorparameters.Length); // Choose a random parameter from the array
         //animator.SetTrigger (animatorparameters [randomJumpAnim]);
         print (animatorparameters [randomJumpAnim]);
         AnimatorStateInfo stateInfo = animator.GetCurrentAnimatorStateInfo(0);
 
         if (stateInfo.IsName("Base Layer.Run"))
         {
             if (Input.GetKey(KeyCode.Space)) 
             {   
             animator.SetTrigger(animatorparameters[randomJumpAnim]);
                 }
 
 
         }
 
 
 
 
 }
 
 }