jQuery不适用于动态添加的表格行(jquery doesn't work on dynamically added table rows)

 所以我有一个表，其中用户将输入一些东西，在最后一列中，它将根据其他列的输入自动填充。 它工作得很好，但是一旦我在表中添加另一行，它不会像原始行那样填充最后一列。 
 
 所以我的问题是什么是错的，我该如何解决这个问题呢？ 
 
 谢谢！ 
 
 添加行的脚本： 
 
$('.add_row_count').on('click',function(){
event.preventDefault();
var newRow = $('<tr><td style = "text-align: center;"><input type="text" name="categ_name[]" id="categ_name" value="" placeholder="Item Category" required></td> ' +
'<td style = "text-align: center;"><input type="number" name="beg_count[]" id="beg_count" value="" placeholder="BEG Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="del_count[]" id="del_count" value="" placeholder="DEL Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="ret_count[]" id="ret_count" value="" placeholder="RET Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="exc_count[]" id="exc_count" value="" placeholder="EXC Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="pout_count[]" id="pout_count" value="" placeholder="P-Out Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="sales_count[]" id="sales_count" value="" placeholder="SALES Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="end_count[]" id="end_count" value="" placeholder="END Count" required></td>' + 
'<td style = "text-align: center;"><input type="number" name="actual_count[]" id="actual_count" value="" placeholder="Actual Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="variance[]" id="variance" value="" placeholder="Variance" readonly></td>' +
'<td style="border-top: 1px solid white; border-bottom: 1px solid white; border-right: 1px solid white"><button class="del" id="delete_row_count" type="button" onclick="deleterow_count();">Delete row</button></td></tr>');
 $('table.count').append(newRow);
});
 
 用于填充最后一列的脚本： 
 
      $('#categ_name,#beg_count, #del_count, #ret_count,#exc_count, #pout_count, #sales_count,#end_count, #actual_count, #variance').keyup(function (){

  var end = $('#end_count').val();
  var ac = $('#actual_count').val();

  var total_variance = end - ac;


   $('#variance').val(total_variance);     
  });
 
 小提琴： https ： //jsfiddle.net/qhk3ha75/3/ 

So I have a table wherein the user will input something and in the last column, it will be populated automatically based on the input of the other columns. It's working well enough but once i add another row to the table, it doesn't fill the last column like the original row does.
 
So my question is what's wrong and how can I fix this?
 
Thanks!
 
script for adding rows:
 
$('.add_row_count').on('click',function(){
event.preventDefault();
var newRow = $('<tr><td style = "text-align: center;"><input type="text" name="categ_name[]" id="categ_name" value="" placeholder="Item Category" required></td> ' +
'<td style = "text-align: center;"><input type="number" name="beg_count[]" id="beg_count" value="" placeholder="BEG Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="del_count[]" id="del_count" value="" placeholder="DEL Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="ret_count[]" id="ret_count" value="" placeholder="RET Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="exc_count[]" id="exc_count" value="" placeholder="EXC Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="pout_count[]" id="pout_count" value="" placeholder="P-Out Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="sales_count[]" id="sales_count" value="" placeholder="SALES Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="end_count[]" id="end_count" value="" placeholder="END Count" required></td>' + 
'<td style = "text-align: center;"><input type="number" name="actual_count[]" id="actual_count" value="" placeholder="Actual Count" required></td>' +
'<td style = "text-align: center;"><input type="number" name="variance[]" id="variance" value="" placeholder="Variance" readonly></td>' +
'<td style="border-top: 1px solid white; border-bottom: 1px solid white; border-right: 1px solid white"><button class="del" id="delete_row_count" type="button" onclick="deleterow_count();">Delete row</button></td></tr>');
 $('table.count').append(newRow);
});
 
script for populating the last column:
 
      $('#categ_name,#beg_count, #del_count, #ret_count,#exc_count, #pout_count, #sales_count,#end_count, #actual_count, #variance').keyup(function (){

  var end = $('#end_count').val();
  var ac = $('#actual_count').val();

  var total_variance = end - ac;


   $('#variance').val(total_variance);     
  });
 
fiddle: https://jsfiddle.net/qhk3ha75/3/

原文：https://stackoverflow.com/questions/40603460