jquery, dropdown

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function OnSuccess(response) {

         var productSubCode = '#' + '<%=PRODUCT_SUBCODE.ClientID %>';
         var sc = $(productSubCode).empty();
         $.each(response.d, function (i, d) {
             sc.append($('<option/>').val(d).html(d));           
         });
         //alert("Success: " + response.d);
     }

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It seems like OnSuccess return me  <select><option>Test</option></select> only.
How can I get a point return me below:

<select><option value="Test">Test</option></select>
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Most Valuable Expert 2017
Distinguished Expert 2018

Commented:
There must be something else wrong.
This code using your javascript works perfectly. How are you examining the created <option>'s?
<!doctype html>
<html>
<head>
<script src="http://code.jquery.com/jquery.js"></script>
</head>
<body>
<select id="test"></select>
<script>
function OnSuccess(response) {
  var sc = $('#test').empty();
  $.each(response.d, function (i, d) {
    sc.append($('<option/>').val(d).html(d));          
  });
}
var data = {
   d: [
      'test1',
    'test2',
    'test3'
   ]
}
OnSuccess(data);
</script>
</body>
</html>

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Working sample here
leakim971Multitechnician
Top Expert 2014

Commented:
try this one :

function OnSuccess(response) {

         var productSubCode = '#' + '<%=PRODUCT_SUBCODE.ClientID %>';
         var sc = $(productSubCode).empty();
         var jsonString = response.d;
         var jsonObject = $.parseJSON(jsonString);
         $.each(jsonObj, function (i, d) {
             sc.append($('<option/>').val(d).html(d));           
         });
         //alert("Success: " + response.d);
     }

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optimized(?) version :
function OnSuccess(response) {

         var productSubCode = '#' + '<%=PRODUCT_SUBCODE.ClientID %>';
         var jsonString = response.d;
         var jsonObject = $.parseJSON(jsonString); // please note $.parseJSON is deprecated since jquery 3.0
         var sc = new Array();
         for(var i=0;i<jsonObject.length;i++)
         {
             var d = jsonObject[i];
             sc.push("<option value='" + d +"'> + d + "</option>");           
         };
         $(productSubCode).html(sc.join(""));
         //alert("Success: " + response.d);
     }

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Most Valuable Expert 2017
Distinguished Expert 2018
Commented:
We are missing a bit of the puzzle here
You have this
$.each(response.d, function (i, d) {
  sc.append($('<option/>').val(d).html(d));           
});

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Which produces this
<select><option>Test</option></select>

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So 'd' in the loop is evaluating to Test. If d was an unparsed JSON string we should still see the full JSON string in the value.

Can you do some screen grabs (if you can't send us a link)
1. Right click the Select and select inspect element (Show us the HTML for this)
2. Click the console tab and show us the returned response from the server

Can you also show us the code that is generating the response.
leakim971Multitechnician
Top Expert 2014

Commented:
The accepted answer ask questions when my last answer solve the issue especially my optimised version.
We know .Net return : {d:"the json string"}

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