Cannot fetch values from dynamically created textboxes in javascript -

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form snapshot 2php code creating textboxes dynamically

for($i=0;$i<count($chkselec);$i++)             {                 echo "<td align='center'><input type='text' id='".$columnvalue[$i]."' name='".$columnvalue[$i]."[]' size='5' onchange=addtoaggr('".$columnvalue[$i]."',".$count_var.") required /></td>";                }  echo "<td align='center'><input type='text' id='aggr' name='aggr[]' size='7' value='".$rowtext['totalgrade']."' readonly='readonly' disabled/></td>";

this javascript function

var i=0; var totalgrade=0; function addtoaggr(val,countvar) {     var group6 = document.piscoreform.aggr;     for(var i=0;i<2;i++)     {         for(var j=i;j<countvar;j++)         {             if(val=='comm')             {                        var group1 = document.piscoreform.comm;                  totalgrade += parsefloat(group1[i].value);             }             else if(val=='presskil')                 {                 var group2 = document.piscoreform.presskil;                 totalgrade += parsefloat(group2[i].value);                 alert('2 :'+totalgrade);             }             else             {                     totalgrade += 0;             }         }            document.getelementsbyname("aggr")[i].value = totalgrade;         alert("total " + i+" "+totalgrade);      } }

i want find average of each column , display in aggr textbox. in first loop ,the condition i<2 number of panalist. hard-coded value time-being.

for starters document.getelementsbyname call should accept 'aggr[]' , not 'aggr' remove "not object" errors being throw on console.

without having additional context there may additional changes required, here's fix applied you've provided.

<!doctype html> <html lang="en"> <head>     <meta charset="utf-8">     <title>php code creating textboxes dynamically</title> </head> <body>  <?php // mock data $rowtext = array (     'totalgrade' => 0 ); $columnvalue = array(); for($i=0;$i<5;$i++) {     $columnvalue[$i] = "testvalue";     echo "<td align='center'><input type='text' id='".$columnvalue[$i]."' name='".$columnvalue[$i]."[]' size='5' onchange=addtoaggr('".$columnvalue[$i]."',".$i.") required /></td>"; }  echo "<td align='center'><input type='text' id='aggr' name='aggr[]' size='7' value='".$rowtext['totalgrade']."' readonly='readonly' disabled/></td>";  ?>  <script>     var i=0;     var totalgrade=0;     function addtoaggr(val,countvar) {         //var group6 = document.piscoreform.aggr;         for(var i=0;i<2;i++)         {             for(var j=i;j<countvar;j++)             {                 if(val=='comm')                 {                     var group1 = document.piscoreform.comm;                     totalgrade += parsefloat(group1[i].value);                 }                 else if(val=='presskil')                 {                     var group2 = document.piscoreform.presskil;                     totalgrade += parsefloat(group2[i].value);                     alert('2 :'+totalgrade);                 }                 else                 {                     totalgrade += 0;                 }             }             document.getelementsbyname("aggr[]")[i].value = totalgrade;             alert("total " + i+" "+totalgrade);         }     } </script>  </body> </html>

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