javascript - 添加新输入点击功能删除之前的输入内容

Question

我有一个“添加访客”(添加输入)按钮，当用户单击它时，它下方会出现一个新的输入。我的问题是，如果用户填写输入并单击“添加访客”按钮，他们在第一个输入中输入的内容将被删除。

有什么方法可以保留我拥有的功能，但保留输入中的内容，同时仍添加新功能？

$('#addGuest').click(function() {
  var count = $('.guestName').length;
  document.getElementById('guestWrap').innerHTML += '<div class="formField guestName" id="guestName' + (count + 1) + '"><label class="label">What is your guest\'s name?</label><input type="text" class="input" name="guest' + (count + 1) + '" id="guest' + (count + 1) + '"></div>';
  $('.guestName').fadeIn(400);
});

.formField {
	margin-bottom: 40px;
}
.label {
	font-family: 'Quicksand', sans-serif;
	font-size: 1.2rem;
	line-height: 1.5em;
	margin: 20px 0;
	display: block;
}
.input {
	font-family: 'Open Sans', sans-serif;
	font-size: .9rem;
	display: block;
	width: 60%;
	padding: 15px 10px;
	text-align: center;
	margin: 0 auto;
	outline: none;
	-webkit-transition: 1s;transition: 1s;
}
#guestWrap {
	height: auto;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="guestWrap">
  <div class="formField guestName" id="guestName">
    <label class="label">What is your guest's name?</label>
    <input type="text" class="input" name="guest1" id="guest1">
  </div>
</div>
<div id="addGuest">
  <span class="guestIncrease">Add another guest</span>
</div>

Answer 1

当您分配给元素的 innerHTML 时，当前元素将被销毁；容器被清空，只保留原始的 HTML 字符串。因此，容器内任何元素的当前 value 都将丢失。请改用 insertAdjacentHTML，它不会取消引用现有元素:

$('#addGuest').click(function() {
  var count = $('.guestName').length;
  document.getElementById('guestWrap').insertAdjacentHTML('beforeend', '<div class="formField guestName" id="guestName' + (count + 1) + '"><label class="label">What is your guest\'s name?</label><input type="text" class="input" name="guest' + (count + 1) + '" id="guest' + (count + 1) + '"></div>');
  $('.guestName').fadeIn(400);
});

.formField {
	margin-bottom: 40px;
}
.label {
	font-family: 'Quicksand', sans-serif;
	font-size: 1.2rem;
	line-height: 1.5em;
	margin: 20px 0;
	display: block;
}
.input {
	font-family: 'Open Sans', sans-serif;
	font-size: .9rem;
	display: block;
	width: 60%;
	padding: 15px 10px;
	text-align: center;
	margin: 0 auto;
	outline: none;
	-webkit-transition: 1s;transition: 1s;
}
#guestWrap {
	height: auto;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="guestWrap">
  <div class="formField guestName" id="guestName">
    <label class="label">What is your guest's name?</label>
    <input type="text" class="input" name="guest1" id="guest1">
  </div>
</div>
<div id="addGuest">
  <span class="guestIncrease">Add another guest</span>
</div>