How to get the return from the get method in a input field

How to get the return from the get method in a input field

Hi togehter,

i have a problem:

I want to get a variable from another site via ajax get.

Here my code:

$(document).ready(function() {
    $("button:first").click(function(){
        $.get("text.cfc?method=checkIBAN",
        {
            iban: $("#testfeld").val()   
        },
       
        function(data){
         $('#test').html(data);
         $('#testfelder').val(data.html);
        });
     });
});

So I the right staff back but I want to fill the input field with this return. It doesnt work.. :-(.

The return goes to the div "test", but not in the inputfield 'testfield'.

Can you help me?

best regards