如何使用jQuery删除动态添加的行？

Question

我正在尝试在表格的每一行之后放置一个'Delete'按钮。Delete按钮的功能应使其仅在添加新行时才被激活。如果从两行中删除了一行，则也应停用现有行的删除按钮。不胜感激。谢谢。

var regex = /^([a-zA-Z0-9 _-]+)$/;
var cindex = 0;
$(document).on('click','.Buttons', function(e) {
  var count = $('table tr:last input:text').filter((_,el) => el.value.trim() == "").length;
  if(count || !$('select:last').val()){
    alert("Please fill all the fields in the current row");
    return false;
  }
    var $tr    = $('#dataTable tbody tr:last');
    var $clone = $tr.clone(true);
    cindex++;
    $clone.find(':input').not('select').val('').attr('disabled', true);
    $clone.attr('id', 'id'+(cindex) ); //update row id if required
    //update ids of elements in row
    $clone.find("*").each(function() {
            var id = this.id || "";
            if(id != ""){

            var match = id.match(regex) || [];
            if (match.length == 2) {
                this.id = match[1] + (cindex);
            }
            }
    });
    $tr.after($clone);
}); 
  /*`For delete button*/
$(document).on("click", '.DeleteButton', function() {
     $(this).closest("tr").remove();
    });
/*for enable field*/

 $(document).on("click", '.DeleteButton', function() {
     $(this).closest("tr").remove();
    });

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table border="0" cellspacing="1" cellpadding="1" id="dataTable" class="graphtable">
  <thead>

    <tr>
      <td class="headingalign" width="16%">Links</td>
      <td class="headingalign" width="32%">Desciption</td>
      <td class="headingalign" width="16%">Image</td>
      <td class="headingalign" width="16%">URL</td>
      <td class="headingalign" width="16%"></td>

    </tr>
  </thead>
  <tbody>

    <tr id="id01" name="row">

      <td>
    <select type="select-one" id='fldsearch' class="objselect" name="fldsearch" onChange="disableField()" >
          <option value="">Select</option>
          <option value="GDS">Guides</option>
          <option value="LOF">Latest Offers</option>
          <option value="TEM">Templates</option>
          <option value="VID">Videos</option>
        </select>
      </td>
      <td>
        <input id="flddesc" name="flddesc" maxlength="500" disabled="true" class="objinputtext" size="85" value="{//RESPONSE}"  />

      </td>
      <td>
        <input  id="fldimg" name="fldimg" maxlength="50" disabled="true" class="objinputtext" size="35" value="{//RESPONSE}"  />

      </td>
      <td>
        <input id="fldurl" name="fldurl" maxlength="15" disabled="true" class="objinputtext" size="35" value="{//RESPONSE}"  />

      </td>
      <td>
      <input tabindex="6" id="Button4" value="Delete Row" disabled="true" class="DeleteButton" name="Button4" type="button" />
      </td>
    </tr>
  </tbody>
</table>  
        <div class="buttonarea">
  <ul>
    <li><input tabindex="6" id="Button3" value="Add New Row" class="Buttons" name="Button3" type="button" /></li>
  </ul>

</div>

Answer 1

您可以通过单击每个“添加新行”按钮和“删除行”按钮来获得表中的行数：

var Count = $('#dataTable tr').length;

然后使用Count的值可以启用/禁用删除按钮，例如

if(Count < 2 )
//code to disable
else
//code to enable

Answer 2

我不知道我是否正确回答了您的问题，但我会尝试这样做：

我将通过一个名为'active'的类来处理此问题。您还可以为此类提供禁用的样式。如果单击按钮，我还将切换jquery的显示/隐藏功能。如果一个按钮是最后一个站着的人，我将全部隐藏。因此，它不再可以单击。如果您只需要显示/隐藏按钮，也可以忽略“活动”类。这些按钮应具有特定的类'del-btn'。

注意：“活动”类仅用于显示按钮，但禁用/启用。显示/隐藏用于“删除”按钮。

var regex = /^([a-zA-Z0-9 _-]+)$/;
var cindex = 0;
$(document).on('click','.Buttons', function(e) {
  var count = $('table tr:last input:text').filter((_,el) => el.value.trim() == "").length;
  if(count || !$('select:last').val()){
    alert("Please fill all the fields in the current row");
    return false;
  }
 var $tr    = $('#dataTable tbody tr:last');
 var $clone = $tr.clone(true);
 cindex++;
 $clone.find(':input').not('select').val('').attr('disabled', true);
 $clone.attr('id', 'id'+(cindex) ); //update row id if required
 //update ids of elements in row
 $clone.find("*").each(function() {
        var id = this.id || "";
        if(id != ""){

        var match = id.match(regex) || [];
        if (match.length == 2) {
            this.id = match[1] + (cindex);
        }
        }
});

// If you want to activate ALL buttons:
$('.del-btn').addClass('active');

// If just the added row should be active:
$clone.find('.del-btn').addClass('active');

$(".del-btn").show();

$tr.after($clone);
}); 
  /*`For delete button*/
$(document).on("click", '.DeleteButton', function() {
     if(!$(this).hasClass('active')){
        // removing is allowed
        $(this).closest("tr").remove();
        // Now you can check, if the rest should be shown or not
        var btns = $('.del-btn').length; // count the buttons in the dom
        if(btns>0){
            if(btns == 1){
               $(".del-btn").hide();
            }else{
               $(".del-btn").show();
            }
        }
     }else{
        // removing is disallowed
     }

    });
``````````````````````````for enable field``````````````````````



 $(document).on("click", '.DeleteButton', function() {
     $(this).closest("tr").remove();

 });