如何将值放在克隆的输入类型文件字段中

Question

当我点击+号时，将克隆新行。我已经做了一些工作，为该副本第一行值并将该值放在克隆行中。一切都会好的，但文件上传值不会在新行中显示。

function insRow()
{
    var x=document.getElementById('scrolltable');
    var new_row = x.rows[1].cloneNode(true);
    var len = x.rows.length;

    var code=document.getElementById('code1').value;
    var product=document.getElementById('product1').value;
    var first=document.getElementById('first1').value;
    var additn=document.getElementById('additn1').value;
    var qty=document.getElementById('qty1').value;
    var oldfname=document.getElementById('oldfilename1').value;
    var lastIndex = oldfname.lastIndexOf("\\");
    if (lastIndex >= 0) {
      oldfname = oldfname.substring(lastIndex + 1);
    }

    var inp1 = new_row.cells[0].getElementsByTagName('input')[0];
    inp1.id += len;
    inp1.value = code;
    inp1.setAttribute('readonly', 'readonly');

    var inp2 = new_row.cells[1].getElementsByTagName('input')[0];
    inp2.id += len;
    inp2.value = product;
    inp2.setAttribute('readonly', 'readonly');

    var inp3 = new_row.cells[2].getElementsByTagName('input')[0];
    inp3.id += len;
    inp3.value = first;
    inp3.setAttribute('readonly', 'readonly');

    var inp4 = new_row.cells[3].getElementsByTagName('input')[0];
    inp4.id += len;
    inp4.value = additn;
    inp4.setAttribute('readonly', 'readonly');

    var inp5 = new_row.cells[4].getElementsByTagName('input')[0];
    inp5.id += len;
    inp5.value = qty;
    inp5.setAttribute('readonly', 'readonly');

    var inp6 = new_row.cells[5].getElementsByTagName('input')[0];
    inp6.id += len;
    //inp6.value = oldfname;
    inp6.setAttribute("type", "file"); 

    var button = new_row.cells[6].getElementsByTagName('input')[0];
    button.value = "#";
    button.onclick = function() {editRow(this)}; 
    var button = new_row.cells[6].getElementsByTagName('input')[1];
    button.value = "-";
    button.disabled=false;

    x.appendChild( new_row );
    document.getElementById('code1').value='';
    document.getElementById('product1').value='';
    document.getElementById('first1').value='';
    document.getElementById('additn1').value='';
    document.getElementById('qty1').value='';
    document.getElementById('oldfilename1').value='';
    document.getElementById('code1').focus();
}  

html代码是，

<table id="scrolltable" class="table">
  <thead>
  <tr>
  <th>Code</th>
  <th>Product</th>
  <th>First</th>
  <th>Add</th>
  <th>Qty</th>
  <th>File</th>
  <th>Action</th>
  </tr>
  </thead>
 <tbody>
    <tr><td><input type="text" name="code" id="code1"   /> </td>
    <td><input type="text" name="product[]" value=""  class="input-medium" id="product1"  /> </td>
  <td><input type="text" name="first[]" value=""  class="input-small" id="first1"/></td>
  <td><input type="text" name="additn[]" value=""  class="input-small" id="additn1" /></td>
 <td><input type="text" name="qty[]" value=""  class="input-small" id="qty1" /></td>
 <td><input type="file" name="oldfilename[]" value=""  class="input-small" id="oldfilename1" /></td>
  <td><input type="button" id="addmorePOIbutton" style="width:25px;" value="+" onClick="insRow()"/>
      <input type="button" id="delPOIbutton" style="width:25px;" value="-" onClick="deleteRow(this)" disabled />
   </td></tr>
 </tbody>
   </table>

我的小提琴文件是http://jsfiddle.net/c9dccnua/