我想在 JavaScript 的克隆方法中更改标签值

Question

我正在使用 JavaScript 通过单击一个按钮来克隆一行表单。并且每次添加一行时，新行的标签值都会发生变化。我的意思是主要标签是“依赖 2”，在新行中它更改为“依赖 3”。我不知道如何更改标签。在这里你可以看到我的代码。克隆正在运行但没有更改标签：

function myFunction() {
  var elem = document.querySelector('#dependent');
  var clone = elem.cloneNode(true);
  clone.id = "dependent2";
  elem.after(clone);

  var param = document.getElementsByTagName("lable");
  var id = new Array();
  for (i = 2; i < 7; i++) {
    id[i] = param.item(i);
    lable[i].innerHTML = "dependent" + i + 1;
  }
}

<form class="needs-validation" invalidate>
  <div class="form-row">
    <label class="col-4 offset-2 col-form-label">Dependent 1</label>
    <div class="form-group col-4">
      <div class="input-group mx-auto" style="border-radius: 3px;width:100%;">
        <input type="number" class="form-control " id="validationDefault01" style="font-size:15px" placeholder="Age" required>
      </div>
    </div>

  </div>
  <div class="form-row" id="dependent">
    <label class="col-4 offset-2 col-form-label">Dependent 2</label>
    <div class="form-group col-4">
      <div class="input-group mx-auto" style="border-radius: 3px;width:100%;">
        <input type="number" class="form-control " id="validationDefault01" style="font-size:15px" placeholder="Age" required>
      </div>
    </div>

  </div>

  <button class="quebtn1 mx-auto" type="button" style="width: 150px;border-radius:8px;" onClick="myFunction()">Add Dependents</button>

Answer 1

除了打字错误（标签/标签）之外，您似乎使标签文本的更新变得过于复杂（为什么循环？）。这可以简单地完成：

let nextLabel = 3;
function myFunction() {
  var elem = document.querySelector('#dependent');
  var clone = elem.cloneNode(true);
  clone.id = "dependent"+nextLabel;
  elem.parentElement.insertBefore(clone,elem.parentElement.children[elem.parentElement.length-1]);
  var label = clone.querySelector("label")
  label.innerHTML = "Dependent " + (nextLabel++);
}

<form class="needs-validation" invalidate>
  <div class="form-row">
    <label class="col-4 offset-2 col-form-label">Dependent 1</label>
    <div class="form-group col-4">
      <div class="input-group mx-auto" style="border-radius: 3px;width:100%;">
        <input type="number" class="form-control " id="validationDefault01" style="font-size:15px" placeholder="Age" required>
      </div>
    </div>

  </div>
  <div class="form-row" id="dependent">
    <label class="col-4 offset-2 col-form-label">Dependent 2</label>
    <div class="form-group col-4">
      <div class="input-group mx-auto" style="border-radius: 3px;width:100%;">
        <input type="number" class="form-control " id="validationDefault01" style="font-size:15px" placeholder="Age" required>
      </div>
    </div>

  </div>

  <button class="quebtn1 mx-auto" type="button" style="width: 150px;border-radius:8px;" onClick="myFunction()">Add Dependents</button>

我想在 JavaScript 的克隆方法中更改标签值

I want to change label value in clone method in JavaScript

html

javascript

for-loop

clone