สอบถามวิธีกำหนดตัวอักษรตามประเภท Job งาน

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<input type="radio" value="Transport" name="chk"> Transport <br/>
<input type="radio" value="SPTransport" name="chk"> Speacial Transport <br/>
<input type="radio" value="Repair" name="chk"> Repair <br/>
<input type="radio" value="SPRepair" name="chk"> Speacial Repair <br/>
<input type="text" id="txtOrder"> 

<script>
    $(function(){
        $(':radio').on('click',function(){
            var Order;
            if($(this).val() == 'Transport'){
                Order="DS59-0000";
            }else if($(this).val() == 'SPTransport'){
                Order="SO59-0000";
            }else if($(this).val() == 'Repair'){
                Order="RP59-0000";
            }else{
                Order="RS59-0000";
            }
            $('#txtOrder').val(Order);
        });
    })
</script>