Getting animation to play all the way throughby pressing key once

I am trying to get an animation to play through all the way but it doesn't. The code I am using is:

function Update ()
 {
 if(Input.GetKeyDown("joystick button 2"))
 {
 animation.Play("HiroXAttack1");
 // name of the animation clip
 }
 }
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I have to press the button repeatedly to play the entire animation through.

I tried a different approach and did:

var isAttacking = false;
function Update ()
{
 if(Input.GetKeyDown("joystick button 2"))
 {
isAttacking = true;
 }
 if(isAttacking)
{
animation.Play("HiroXAttack1");
}

if(Input.anyKey == false)
{
 isAttacking = false;
 animation.Stop();
}
 }

=======================================================================================================================================================================

Your first code snippet should work, provided you have set your animation mode to Once, or Clamp, or ClampForever.

function Update ()
{
 if(Input.GetKeyDown("joystick button 2"))
 {
 animation.wrapMode = WrapMode.Once;
 animation.Play("HiroXAttack1");
// name of the animation clip
 }
}
==================================================================================================================================================

There is also a solution if you want the animations to be on the same layer. To play a given animation without stopping other animations on the same layer, you need to not use Animation.Play but instead do:

animation["MyOtherAnimation"].enabled = true;
animation["MyOtherAnimation"].weight = 1;
 animation["MyOtherAnimation"].time = 0;
==================================================================================================================================================