Javascript 使可见并在单击时添加多个 div-现在几乎可以工作

Question

我正在尝试使用 Javascript 在单击按钮时向页面添加一个部分。我无法让它工作。我的代码笔是 https://codepen.io/anon_guy/pen/VMZWWW

(感谢您的帮助，我已经让它接近我想要的位置，但是该元素最初仍然可见，它应该被隐藏但是如果我在 CSS 中将显示设置为无，JS 不会更改它。代码已经改变了很多，这是我目前要做的

HTML :

 <div class="panel panel-default">
  <div class="panel-heading">
  </div>
  <div class="panel-body">
    <form action="<?php echo $action; ?>" method="post" enctype="multipart/form-data" id="form-event" class="form-horizontal">
      <div class="col-sm-4">
        <label>name</label>
        <input type="text" name="name" value="name" placeholder="name" id="name" class="form-control" />
      </div>
      <div class="col-sm-4">
        <label>address</label>
        <input type="text" name="address" value="address" placeholder="address" id="address" class="form-control" />
      </div>
      <div class="col-sm-4">
        <label>phone</label>
        <input type="text" name="phone" value="phone" placeholder="phone" id="phone" class="form-control" />
        <div class="text-danger"></div>
      </div>

    </form>
  </div>
  <div class="row">
  <div class="add_component">
    <button id='launch'>Add Component</button>
  </div>
  </div>
</div>
<div class="wrapper">
  <div class="panel panel-default " id="addon">
    <div class="panel-heading">
    </div>
    <div class="panel-body">
      <form action="<?php echo $action; ?>" method="post" enctype="multipart/form-data" id="form-event" class="form-horizontal">
        <div class="col-sm-6">
          <label>component</label>
          <iv>

      </form>
    </div>
  </div>
</div>iv>

      </form>
    </div>
  </div>
</div>

JS :

 document.getElementById('launch').onclick = function() {
    var addOnDiv = document.getElementById('addon');

    if (addOnDiv.style.display === 'none') {
      addOnDiv.style.display = 'block';
    } else {

      var clonedNode = addOnDiv.cloneNode(true);
      addOnDiv.appendChild( clonedNode );      
    }
  }

CSS:

button {
  float: right;
  margin: 30px;
}

.panel-body {
  border: 1px solid #333;
  background: azure;
}
#addon{
  display:none;
}

Answer 1

Working fiddle .

您可以将显示默认设置为无，然后在您第一次单击时将其更改为阻塞，否则克隆元素容器并附加它:

document.getElementById('show/hide').onclick = function() {
  var divTest = document.getElementById('addon');

  if (divTest.style.display === 'none') {
    divTest.style.display = 'block';
  } else {
    var new_line = divTest.querySelector('.col-sm-6').cloneNode(true);
    divTest.querySelector('.panel-body').appendChild( new_line );
  }
}

希望这对您有所帮助。