How do I use jquery to total fields in rows for a variable number of rows -

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i trying add option fields on row total field on row, using jquery. can't use ids because there variable number of rows, created clone user needs them.

<tr> <td><input name="option_1[]" type="text" class="integer add_to_total"  /></td> <td><input name="option_2[]" type="text" class="numeric add_to_total"/> </td> <td><input name="option_3[]" type="text" class="numeric add_to_total"/> </td> <td><input name="total[]" type="text"   class="numeric is_total"  /> </td> </tr>

i thought of attaching change event input fields 'add_to_total' class , using sibling function add 'is_total' class. can't syntax right:

$(".add_to_total").change(function() {     var line_total = 0;     line_total += $(this + " .add_to_total").siblings().val();     $(this +  " .is_total").siblings().val(line_total); });  syntax errors , doesn't work. 

$('.add_to_total').change(function(){   var total = 0;   var row = $(this).closest('tr');   row.find('.add_to_total').each(function(){     total += this.value.replace(/[^\d\.-]/,'')*1;   });   row.find('.is_total').val( total ); });

the replace() allows user enter 1,000 , not have end nan total.

if speed big concern, might suggest caching row.find('.add_to_total') jquery data on row, that's optimization best left until you're sure need it.


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