dynamic forms multiple input fields calculate

Question

I need to add form fields dynamically. Each group of input values contain 3 fields, quantity, price, and total. Every time I insert nu

Answer 1

Here is the solution:

FIRST: Added JQuery

SECOND: Corrected the method to calculate. It should multiply instead of making sum if you want quantity * price. Review my changes

THIRD: Added a number on each ID and in the append method.

FOURTH: Changed calculate method to carry the id

THIRD: Commented the timer you created, and called the method that calculates the final value inside the JQUERY event "change" of the inputs. This way, you are not processing forever (even when nothing changed) and it´s only calculated when the change event is fired

Hope it helps

$(document).ready(function() {
  var i = 0;
  $("#quantity-" + i).change(function() {
    upd_art(i)
  });
  $("#price-" + i).change(function() {
    upd_art(i)
  });


  $('#add').click(function() {
    i++;
    $('#articles').append('   X');

    $("#quantity-" + i).change(function() {
      upd_art(i)
    });
    $("#price-" + i).change(function() {
      upd_art(i)
    });


  });


  $(document).on('click', '.btn_remove', function() {
    var button_id = $(this).attr("id");
    $('#row' + button_id + '').remove();
  });

  $('#submit').click(function() {
    alert($('#add_name').serialize()); //alerts all values           
    $.ajax({
      url: "wwwdb.php",
      method: "POST",
      data: $('#add_name').serialize(),
      success: function(data) {
        $('#add_name')[0].reset();
      }
    });
  });

  function upd_art(i) {
    var qty = $('#quantity-' + i).val();
    var price = $('#price-' + i).val();
    var totNumber = (qty * price);
    var tot = totNumber.toFixed(2);
    $('#total-' + i).val(tot);
  }



  //  setInterval(upd_art, 1000);
});

  
  
  



  

    

    

    
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