javascript - Calculate only current field not changed fields -


i have tried couple of things cannot seem right! have following document (code follow), calculates automatically , add fields add more quantities. if qty_1 changed (manually), , calculation added, "changed qty_1" reverts first calculated value. changed value remain.

the file:

<script> function calculate(){     for(var i=1; i<=ct; i++){         var currentdiv = document.getelementbyid(i);         var ori_qty = currentdiv.getelementsbytagname('input')[0].value;         var total = math.round(ori_qty/0.8);         currentdiv.getelementsbytagname('input')[1].value = total;         currentdiv.getelementsbytagname('input')[2].value = total;     }; }  var ct = 1; function new_combi(){     ct++;     var div1 = document.createelement('div');     div1.id = ct;     // link delete extended form elements     var dellink = '<div style="text-align:right;margin-right:65px"><a href="javascript:delit('+ ct +')">delete</a></div>';     div1.innerhtml = document.getelementbyid('var_roo_fields').innerhtml + dellink;     document.getelementbyid('addcom').appendchild(div1); }  function delit(eleid){     d = document;     var ele = d.getelementbyid(eleid);     var parentele = d.getelementbyid('addcom');     parentele.removechild(ele); } </script>  <form id="form1" name="form1" method="post" action="">     <div id="addcom" style="width:100%">         <div id="1">         <table class='table1' width="100%" border="0" cellpadding="0" cellspacing="2">         <tr>         <td width="25%" valign="top">original quantity</td>         <td width="27%" valign="top"><input type="text" name="ori_qty[]" onblur="calculate()" /></td>         <td width="24%" valign="top">&nbsp;</td>         <td width="24%" valign="top">&nbsp;</td>         </tr>         <tr>         <td valign="top">quantity 1</td>         <td valign="top"><input type="text" name="qty_1[]" id="qty_1[]" />         </td>         <td valign="top">quantity 2</td>         <td valign="top"><input type="text" name="qty_2[]" id="qty_2[]" /></td>         </tr>         </table>         </div>     </div> <a href="javascript:new_combi()">add calculation</a> </form>  <!-- repeat fields --> <div id="var_roo_fields" style="display:none"> <div> <hr /> <table class='table1' width="100%" border="0" cellpadding="0" cellspacing="2">     <tr>     <td width="25%" valign="top">original quantity</td>     <td width="27%" valign="top"><input type="text" name="ori_qty[]" onblur="calculate()" /></td>     <td width="24%" valign="top">&nbsp;</td>     <td width="24%" valign="top">&nbsp;</td>     </tr>     <tr>     <td valign="top">quantity 1</td>     <td valign="top"><input type="text" name="qty_1[]" id="qty_1[]" />     </td>     <td valign="top">quantity 2</td>     <td valign="top"><input type="text" name="qty_2[]" id="qty_2[]" /></td>     </tr> </table> </div> </div>

so original amounts calculated - , changed manually - stay same after calculation added.

here have fiddle: https://jsfiddle.net/y8une7ub/


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