Question

function add() {
  var new_chq_no = parseInt($('#total_chq').val()) + 1;
  var new_input = "<input type='text' id='new_" + new_chq_no + "'>";
  $('#new_chq').html(new_input);
}

function remove() {
  var last_chq_no = $('#total_chq').val();
  if (last_chq_no > 1) {
    $('#new_' + last_chq_no).append('');
    $('#total_chq').val(last_chq_no - 1);
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text">
<button onclick="add()">Add</button>
<button onclick="remove()">remove</button>
<div id="new_chq"></div>
<input type="hidden" value="1" id="total_chq">

它添加输入字段一次，第二次点击它不添加任何内容而删除按钮不起作用

Answer 1

<强> Working fiddle

添加元素时，您必须使用.append()代替.html()：

$('#new_chq').append(new_input);

最好在JS代码中附加事件，如：

$('.add').on('click', add);
$('.remove').on('click', remove);

注1：不要忘记增加计数器#total_chq：

$('#total_chq').val(new_chq_no);

注2：如果要删除元素，则必须使用.remove()。

$('.add').on('click', add);
$('.remove').on('click', remove);

function add() {
  var new_chq_no = parseInt($('#total_chq').val()) + 1;
  var new_input = "<input type='text' id='new_" + new_chq_no + "'>";

  $('#new_chq').append(new_input);

  $('#total_chq').val(new_chq_no);
}

function remove() {
  var last_chq_no = $('#total_chq').val();

  if (last_chq_no > 1) {
    $('#new_' + last_chq_no).remove();
    $('#total_chq').val(last_chq_no - 1);
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text">
<button class="add">Add</button>
<button class="remove">remove</button>
<div id="new_chq"></div>
<input type="hidden" value="1" id="total_chq">

Answer 2

检查代码段，希望这就是您要找的内容：D

＆＃13;

function add(){
      var new_chq_no = parseInt($('#total_chq').val())+1;
      var new_input="<input type='text' id='new_"+new_chq_no+"'>";
      $('#new_chq').append(new_input);
      $('#total_chq').val(new_chq_no)
    }
    function remove(){
      var last_chq_no = $('#total_chq').val();
      if(last_chq_no>1){
        $('#new_'+last_chq_no).remove();
        $('#total_chq').val(last_chq_no-1);
      }
    }

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text">
  <button onclick="add()">Add</button>
  <button onclick="remove()">remove</button>
  <div id="new_chq"></div>
  <input type="hidden" value="1" id="total_chq">

＆＃13;

Answer 3

$('.add').on('click', add);
$('.remove').on('click', remove);

function add() {
  var new_chq_no = parseInt($('#total_chq').val()) + 1;
  var new_input = "<input type='text' id='new_" + new_chq_no + "'>";

  $('#new_chq').append(new_input);

  $('#total_chq').val(new_chq_no);
}

function remove() {
  var last_chq_no = $('#total_chq').val();

  if (last_chq_no > 1) {
    $('#new_' + last_chq_no).remove();
    $('#total_chq').val(last_chq_no - 1);
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text">
<button class="add">Add</button>
<button class="remove">remove</button>
<div id="new_chq"></div>
<input type="hidden" value="1" id="total_chq">

如何在按钮单击时添加输入字段

3 个答案: