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<!DOCTYPE html>
<html>
<body>
​
<form>
  Select numbers:<br>
  <select id="no">
    <option>0</option>
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
    <option>5</option>
    <option>6</option>
    <option>7</option>
    <option>8</option>
    <option>9</option>
  </select>
  <input type="button" onclick="myFunction()" value="-->"> 
  <input type="text" id="result" size="20">
</form>
​
<script>
function myFunction() {
  var no = document.getElementById("no");
  var option = no.options[no.selectedIndex].text;
  var txt = document.getElementById("result").value;
  txt = txt + option;
  document.getElementById("result").value = txt;
}
</script>
​
</body>
</html>
​