JSON- PHP generated JS-file question

JSON- PHP generated JS-file question

So i'm back again. The idea is still to type in a code, and automatically show the price of that item. I'm getting close and i have the following:
<script language="javascript" type="text/javascript">

$(function() {
   $("input").next("#prijs").hide();
   
   $("#naam").blur(function () {      
       $.getJSON("producten.js", function(json) {      
              /* Parse JSON objects */
               jJSON["prijs"] = (function() {
                  response = {
                      values:[],
                  };
               
                  $.each(json.channel.items,function(i,item) {
                      if(item.naam == $("#naam").val()){
                      if (item.prijs != "undefined") {
                             response.values = item.prijs;
                         $("#prijs").text(item.prijs);
                         }
                  }else{alert("nope code does not exist");}
                  });
                  return response;
              })();                            
              $("#prijs").show();          
          });
   });
   
});
var jJSON = {
    getValues: function(obj) {
        return jJSON[obj]["values"];
    },
};

</script>

HTML
   <form action="" method="" accept-charset="utf-8">
      <p><input type="text" id="naam" /> <span id="prijs"></span></p>
   <p><input type="submit" value="Continue" /></p>
</form>
      <p><span id="totaal"></span></p>


I generate the producten.js file with PHP each time the DB will be adjusted. It contains :
{"channel":{"items":[{"id":"1","prijs":"10","naam":"a"}, {"id":"2","prijs":"5","naam":"b"}, {"id":"3","prijs":"22","naam":"c"}]}}


now the problem was that i did not know how to communicate with a JS file. Therefore i used google and came op with:
/* Parse JSON objects */
               jJSON["prijs"] = (function() {
                  response = {
                      values:[],
                  };
and
var jJSON = {
    getValues: function(obj) {
        return jJSON[obj]["values"];
    },
};

it's a code i slightly modified from a page i found. But it's also the reason of me posting this. it makes a values[] array and loads ALL the prices of ALL the products, this is not what i want to achief. I just want 1 price, that one that i ask for in the inputfield.

so now the alert(nope code does...) always goes off, which i understand. But i think there must be a way to achief what i want without the extra function, i just can't seem to figure out how ? anyone ?

(if i find the sollution i wil post it here for others to enjoy)