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<span id="sum" name="sum">0</span

<script>
   $(document).ready(function(){

      //iterate through each textboxes and add keyup
      //handler to trigger sum event
      $(".for_calc").each(function() {

         $(this).keyup(function(){
            calculateSum();
         });
      });

   });

   function calculateSum() {

      var sum = 0;
      //iterate through each textboxes and add the values
      $(".for_calc").each(function() {

         //add only if the value is number
         if(!isNaN(this.value) && this.value.length!=0) {
            sum  = parseFloat(this.value);
         }

      });
      //.toFixed() method will roundoff the final sum to 2 decimal places
      $("#sum").html(sum.toFixed());
   }
</script>

แล้วเวลาเราจะเอาค่าผลรวมไปบันทึกลง sql บันทึกยังไงครับ ผมเอา id sum ไปบันทึกมันบันทึกไม่ได้อะครับ