Play animation when transform is moving? [JS]

So i'm trying to make a NPC for my RPG and I got it to where he moves and follows the player but I want it to when he moves he plays the walking animation and if he gets so close to the player than he attacks with damage based off of the damage variable in my script

 #pragma strict
 //I did not make this script I found i t on the forums
  var target : Transform; //the enemy's target
  var moveSpeed = 3; //move speed
  var rotationSpeed = 3; //speed of turning
  var range : float=25f;
  var range2 : float=25f;
  var stop : float=0;
  var damage : int=5;
  var ismoving : boolean = false;
  
  
  var myTransform : Transform; //current transform data of this enemy
  function Awake()
  {
      myTransform = transform; //cache transform data for easy access/preformance
  }
   
  function Start()
  {
       target = GameObject.FindWithTag("Player").transform; //target the player
   
  }
   
  function Update () {
      //rotate to look at the player
      var distance = Vector3.Distance(myTransform.position, target.position);
      if (distance<=range2 &&  distance>=range){
      myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
      Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime);
      }
    
  
      else if(distance<=range && distance>stop){
  
      //move towards the player
      myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
      Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime);
      myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
      }
      else if (distance<=stop) {
      myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
      Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime);
      }
  if (ismoving){ //area I need help
  
  }
   
 
   
  }