如何在按钮单击时添加输入字段

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">

它一次添加输入字段，第二次单击它不添加任何内容并且删除按钮不起作用

Answer 1

工作小提琴。

附加元素时，您必须使用.append()而不是.html() ：

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

最好在您的 JS 代码中附加事件，例如：

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

注意 1：不要忘记增加计数器#total_chq ：

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

注意 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，希望这是您要查找的内容：D

 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 onclick="add()">Add</button> <button onclick="remove()">remove</button> <div id="new_chq"></div> <input type="hidden" value="1" id="total_chq">

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">