Question

我对Jquery一点也不熟悉，尽管这是我需要学习的事情的任务。我目前正在处理一个项目，该项目需要类似于发票上的添加/删除功能。

我希望能够在附加的最后一项中添加“删除”功能，以防止错误等等。

$(document).ready(function() {
  var currentItem = 1;
  $('#addnew').click(function(){
   currentItem++;
   $('#items').val(currentItem);
var strToAdd = '<br>Product: <select class="form" name="Product'+currentItem+'" id="product'+currentItem+'" ><option value="Aramax Classic Tobacco">Aramax Classic Tobacco</option><option value="Aramax Energy Drink">Aramax Energy Drink</option></select>    Nicotine: <select class="form" name="nicotine'+currentItem+'" id="nicotine'+currentItem+'"> <option value="N/A">n/a</option><option value="3mg">3mg</option><option value="6mg">6mg</option><option value="12mg">12mg</option></select>    Quantity:<input class="form3" name="qty'+currentItem+'" id="qty'+currentItem+'" type="number" /><br>';
   $('#data').append(strToAdd);

  });

 });
$('#delete').on('click', function() {
$('#items').parents("br").remove();

});

//]]>
</script><div class="form2">
 <form method="POST" action="invoicereg.php" id="data" name="sub">
    Product:
    <select class="form" name="product1" id="product1">
         <option value="Aramax Classic Tobacco">Aramax Classic Tobacco</option>
         <option value="Aramax Energy Drink">Aramax Energy Drink</option>
     </select>
    Nicotine:
    <select class="form" name="nicotine1" id="nicotine1">
      <option value="N/A">n/a</option>
      <option value="3mg">3mg</option>
      <option value="6mg">6mg</option>
      <option value="12mg">12mg</option>
    </select>
      Quantity:<input class="form3" type="number" id="qty1" name="qty1"></input><br>

    </form>
   <br>
    <input class="button" type="button" id="addnew" name="addnew" value="Add new item" /> 
    <input type="hidden" form="data" id="items" name="items" value="1" />
     <input class="button" type="button" id="delete" name="delete" value="Remove" /> 
    <input class="button" type="submit" form="data" value="SUBMIT">
    </div>
</div>
</body>
</html>

如果有人能够向我展示和/或向我解释如何做到这一点，我们将不胜感激。此致

Answer 1

我用<div>敲了你的表单内容和你添加的内容。

然后你可以$('#data > div').last().remove();

#data是您表单的ID。

#data > div会选择<div>中第一个孩子的所有form。

.last()选择最后一个元素。

注意如果您希望在表单中保留至少1个元素，则可以执行此操作：

if ($('#data > div').length > 1) {
   $('#data > div').last().remove();
}

$(document).ready(function() {
  var currentItem = 1;
  $('#addnew').click(function(){
   currentItem++;
   $('#items').val(currentItem);
var strToAdd = '<div><br>Product: <select class="form" name="Product'+currentItem+'" id="product'+currentItem+'" ><option value="Aramax Classic Tobacco">Aramax Classic Tobacco</option><option value="Aramax Energy Drink">Aramax Energy Drink</option></select>    Nicotine: <select class="form" name="nicotine'+currentItem+'" id="nicotine'+currentItem+'"> <option value="N/A">n/a</option><option value="3mg">3mg</option><option value="6mg">6mg</option><option value="12mg">12mg</option></select>    Quantity:<input class="form3" name="qty'+currentItem+'" id="qty'+currentItem+'" type="number" /><br></div>';
   $('#data').append(strToAdd);

  });

 });
$('#delete').on('click', function() {
  if ($('#data > div').length > 1) {
    $('#data > div').last().remove();
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

</script><div class="form2">
 <form method="POST" action="invoicereg.php" id="data" name="sub">
   <div> 
   Product:
    <select class="form" name="product1" id="product1">
         <option value="Aramax Classic Tobacco">Aramax Classic Tobacco</option>
         <option value="Aramax Energy Drink">Aramax Energy Drink</option>
     </select>
    Nicotine:
    <select class="form" name="nicotine1" id="nicotine1">
      <option value="N/A">n/a</option>
      <option value="3mg">3mg</option>
      <option value="6mg">6mg</option>
      <option value="12mg">12mg</option>
    </select>
      Quantity:<input class="form3" type="number" id="qty1" name="qty1"></input><br>
</div>
    </form>
   <br>
    <input class="button" type="button" id="addnew" name="addnew" value="Add new item" /> 
    <input type="hidden" form="data" id="items" name="items" value="1" />
     <input class="button" type="button" id="delete" name="delete" value="Remove" /> 
    <input class="button" type="submit" form="data" value="SUBMIT">
    </div>
</div>
</body>
</html>

Answer 2

使用<div class="items">yourcode</div>之类的所有div。然后申请$('.items'). last() .remove()

＆＃13;

$(document).ready(function() {
  var currentItem = 1;
  $('#addnew').click(function() {
    currentItem++;
    $('#items').val(currentItem);
    var strToAdd = '<br><div class="items">Product: <select class="form" name="Product' + currentItem + '" id="product' + currentItem + '" ><option value="Aramax Classic Tobacco">Aramax Classic Tobacco</option><option value="Aramax Energy Drink">Aramax Energy Drink</option></select>    Nicotine: <select class="form" name="nicotine' + currentItem + '" id="nicotine' + currentItem + '"> <option value="N/A">n/a</option><option value="3mg">3mg</option><option value="6mg">6mg</option><option value="12mg">12mg</option></select>    Quantity:<input class="form3" name="qty' + currentItem + '" id="qty' + currentItem + '" type="number" /><br></div>';
    $('#data').append(strToAdd);

  });

});
$('#delete').on('click', function() {
  $('.items').last().remove()

});

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="form2">
  <form method="POST" action="invoicereg.php" id="data" name="sub">
    <div class="items">
    Product:
    <select class="form" name="product1" id="product1">
      <option value="Aramax Classic Tobacco">Aramax Classic Tobacco</option>
      <option value="Aramax Energy Drink">Aramax Energy Drink</option>
    </select>
    Nicotine:
    <select class="form" name="nicotine1" id="nicotine1">
      <option value="N/A">n/a</option>
      <option value="3mg">3mg</option>
      <option value="6mg">6mg</option>
      <option value="12mg">12mg</option>
    </select>
    Quantity:
    <input class="form3" type="number" id="qty1" name="qty1"></input>
    <br>
</div>
  </form>
  <br>
  <input class="button" type="button" id="addnew" name="addnew" value="Add new item" />
  <input type="hidden" form="data" id="items" name="items" value="1" />
  <input class="button" type="button" id="delete" name="delete" value="Remove" />
  <input class="button" type="submit" form="data" value="SUBMIT">
</div>
</div>

＆＃13;

Answer 3

最好将添加的项目包装在div中，例如： <div class="added-item"></div>
然后当您单击删除按钮时，您将不得不找到所有这些添加的项目 var added_items = $('.added-item');
然后删除最后一个元素
added_items.last().remove();

Jquery - 删除最后一个追加项

3 个答案: