Array iteration - set keyup on input - sets all inputs to same value, not dynamic value

Hello, everyone.

I've been working with JavaScript for a long time - nothing real fancy, mind you - but I'm scratching my head over this one.  I'm sure I'm missing something extremely simple.  I could use extra eyes, on this.

BTW, I'm in a DoD network, so sites like jsfiddle are blocked.  :(

I've got a form that will very in length each time it's loaded.   It's dynamically generated from a database query.  I'll try to keep the pseudo-code simple.

<form name="rates" id="rates">
  Rate 01: <input name="rate_A_B_1" class="in"><br />
  Rate 02: <input name="rate_A_C_1" class="in"><br />
  Rate 03: <input name="rate_C_A_1" class="out"><br />
  Rate 04: <input name="rate_A_D_1" class="in"><br />
  Rate 05: <input name="rate_D_A_1" class="out"><br />
  Rate 06: <input name="rate_A_E_1" class="in"><br />
  Rate 07: <input name="rate_E_A_1" class="out"><br />
  Rate 08: <input name="rate_A_F_1" class="in"><br />
  Rate 09: <input name="rate_A_G_1" class="in"><br />
  Rate 10: <input name="rate_G_A_1" class="out"><br />
    ...
  Rate 89: <input name="rate_A_Z_1" class="in"><br />
  Rate 90: <input name="rate_B_C_1" class="in"><br />
  Rate 91: <input name="rate_C_B_1" class="out"><br />
  Rate 92: <input name="rate_B_D_1" class="in"><br />
  Rate 93: <input name="rate_D_B_1" class="out"><br />
</form>

What I'm trying to do is (after the form loads, when the page is ready) add an onkeyup event to all "in" inputs that have a matching "out" input (ie, an "in" A_C_1 will get an onkeyup that will set the value of "out" C_A_1 to its value.  But I do not want "out"s to overwrite "in"s.. so apply only to "in" class inputs.)

So I thought, "Simple."  Here's my js.  Although I am using MooTools for some things, I'm mixing MooTools with straight JS for this.

var inInput = $$('.in'), x, thisID, thisIDary, elmnt;
for(x in inInput){
  if(typeof(inInput[x].id) !== 'undefined'){
    thisID = inInput[x].id.trim();
    thisIDary = thisID.split("_");
    outID = thisIDary[0] + "_" + thisIDary[2] + "_" + thisIDary[1] + "_" + thisIDary[3];
    outID = outID.trim(); outID = document.id(outID);
    $(thisID).addEvent('keyup',function(){
      $(outID).set('value',$(thisID).get('value'));
      }
    }
  }

Unfortunately, this will set a keyup event on all "in" class inputs that will set the associated "out" to the  value of the last "in" input of the form.

I'm sure I'm missing something simple.  Could someone please point out my error?

Thank you,

JD

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