javascript - Jquery .change 无法检索插入的复选框值

Question

当我想通过 ajax 调用添加新的复选框输入时，我的脚本中有一个严重的问题。问题是插入后我无法检索此复选框的值。当我更改选择 1 和选择 2 以及选择 3 和选项时。警报必须在每次字段更改时显示 4 个字段的值。

我在 jsfiddle 中给出了一个例子:https://jsfiddle.net/pm4t91ab/39/

脚本代码:

<script>
$(function() {
  $(".ch").change(function() {
    // Récupérer les données du formulaire
    var select1 = $("select#id1").val();
    var select2 = $("select#id2").val();
    var country = $("select#country").val();
        var options = "";
    var op = "<td>Options :</td>" +
      "<br />" +
      "<td>" +
      "<div>" +
      "<label>" +
      "<input type='checkbox' class='ch' id='option1' name='options' class='ch' value='1'>Option1</label>" +
      "</div>" +
      "<div>" +
      "<label>" +
      "<input type='checkbox' id='option2' name='options' class='ch' value='2'>Option2</label>" +
      "</div>" +
      "</td>";

    if (country != "") {
      $('#options_insert').html(op);
    }

    // Bind the elements dynamically created here and get the selected items
    $(document).on('click', 'input[name="options"]', function() {
      var options = $("input[name=options]:checked").map(function() { return this.value;}).get().join(",");
    });


    alert("select1=" + select1 + " select2=" + select2 + " Country=" + country + " options=" + options);

  });

});
</script>

HTML 代码:

<table>

  <tr>
    <td>
      Selection 1 :
    </td>
    <td>
      <select name="select1" class="ch" id="id1">
        <option value="">Nothing</option>
        <option value="val1">val1</option>
        <option value="val2">val2</option>
        <option value="val3">val3</option>
      </select>
    </td>
  </tr>

  <tr>
    <td>
      Selection 2 :
    </td>
    <td>
      <select name="select2" class="ch" id="id2">
        <option value="">Nothing</option>
        <option value="val1">sel1</option>
        <option value="val2">sel2</option>
        <option value="val3">sel3</option>
      </select>
    </td>
  </tr>

  <tr>
    <td>
      Selection 3 :
    </td>
    <td>
      <select name="select" class="ch" id="country">
        <option value="">Nothing</option>
        <option value="val1">Maroc</option>
        <option value="val2">USA</option>
        <option value="val3">Egypt</option>
      </select>
    </td>
  </tr>
  <tr id="options_insert">

  </tr>
</table>

任何帮助将非常感激

Answer 1

这是您的代码的更新版本。它将警报值事件处理(当表单值更改时)与显示选项事件处理(当国家/地区值更改时)分开。

$(document).on('change', "select#country", function() {
  var $optionsElement = $('#options_insert');
  var $selectCountry = $("select#country").val();

  if ($selectCountry === '') {
    $optionsElement.html("");
  } else {
    $optionsElement.html("<td>Options :</td>" +
      "<br />" +
      "<td>" +
      "<div>" +
      "<label>" +
      "<input type='checkbox' class='ch' id='option1' name='options' class='ch' value='1'>Option1</label>" +
      "</div>" +
      "<div>" +
      "<label>" +
      "<input type='checkbox' id='option2' name='options' class='ch' value='2'>Option2</label>" +
      "</div>" +
      "</td>");
  }
});

$(document).on('change', '.ch', function() {
  var $select1 = $("select#id1").val();
  var $select2 = $("select#id2").val();
  var $selectCountry = $("select#country").val();
  var $options = $("input[name=options]:checked").map(function() {
    return this.value;
  }).get();

  alert("select1=" + $select1 + " select2=" + $select2 + " Country=" + $selectCountry + " options=" + $options.join(","));
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<table>

  <tr>
    <td>
      Selection 1 :
    </td>
    <td>
      <select name="select1" class="ch" id="id1">
        <option value="">Nothing</option>
        <option value="val1">val1</option>
        <option value="val2">val2</option>
        <option value="val3">val3</option>
      </select>
    </td>
  </tr>

  <tr>
    <td>
      Selection 2 :
    </td>
    <td>
      <select name="select2" class="ch" id="id2">
        <option value="">Nothing</option>
        <option value="val1">sel1</option>
        <option value="val2">sel2</option>
        <option value="val3">sel3</option>
      </select>
    </td>
  </tr>

  <tr>
    <td>
      Selection 3 :
    </td>
    <td>
      <select name="select" class="ch" id="country">
        <option value="">Nothing</option>
        <option value="val1">Maroc</option>
        <option value="val2">USA</option>
        <option value="val3">Egypt</option>
      </select>
    </td>
  </tr>
  <tr id="options_insert"></tr>
</table>