如何使用 Jquery 获取与 td 元素相关的表标题的值

Question

我想要实现的目标

用户单击表格中的任何

元素，并在输出中显示初始重力 (IG)、最终重力 (FG) 和 ABV，如下所示：

初始重力：1.024 > 最终重力：0.994 = 3.9% ABV。

故障

• 表格的左侧标题是初始重力

• iniGrav 变量应该从表格的左侧标题中获取

  值。

• 表格的顶部标题是最终重力

• finGrav 变量应该从表的顶部标题中获取

  值。

• abv 变量应该从被点击的

  本身获取值。

  我的问题

  我的行 (iniGrav) 和 abv 正常工作，但我不知道如何从表的顶部标题中获取 finGrav 值。我不知道如何找到被点击的列标题值。

  在下面的代码中，我注释掉了我正在尝试的当前 finGrav 变量，并将其替换为“我应该显示 finGrav”

  所以我当前的输出是：

  • 初始重力：1.024 > 最终重力：我应该显示 finGrav = 3.9% ABV

  而不是

  • 初始重力：1.024 > 最终重力：0.994 = 3.9% ABV。

  上面的例子假设用户点击了下图中的 3.9

  元素。

  如何从表头中找到我的最终重力值并将其提供给 finGrav 变量？

  任何帮助表示赞赏，在此先感谢。

  代码

  $('td').click(function() {
  
    // iniGrav is the Initial Gravity row of th down the left
    var iniGrav = $(this).closest("tr").find('th:eq(0)').text();
  
  
    // finGrav should be the row of headings for Final Gravity across the top
    // var finGrav = $(this).closest("table .topHead ").find('th:eq(0)').text();
    var finGrav = "I should show finGrav";
  
  
    var abv = $(this).text();
    var msg = "Initial Gravity: " + iniGrav + 
            " > Final Gravity: "  + finGrav + 
              " = " + abv + "% ABV";
  
    // var title = $(this).title= msg ;
    // alert(msg);
  
    $('#output').html(msg);
  });

  body {
    background: #111;
  }
  
  #output {
    color: #fff;
    margin: 10px auto;
  }
  
  .card-body table {
    width: 100%;
    font-size: 1.2em;
  }
  
  .blank-cell,
  .row-1 td {
    background: #000;
    color: #fff;
  }
  
  td,
  th {
    padding: 2px;
    position: relative;
    outline: 0;
  }
  
  td {
    text-align: center;
    cursor: pointer;
  }
  
  th {
    font-weight: 600;
    color: #0dead0;
  }
  
  td:hover {
    background: #530288;
    color: white;
    box-shadow: inset 0 0 6px 0 #fff;
  }
  
  td {
    font-size: 14px;
    color: #fff;
    width: 10%;
    margin: 0 auto;
    text-align: center;
    text-indent: 6px;
    margin-bottom: 1em;
    position: relative;
    height: 25px;
    border-radius: 4px;
    border: 1px #111 solid;
    -webkit-transition: 0.4s linear;
    -moz-transition: 0.4s linear;
    -ms-transition: 0.4s linear;
    -o-transition: 0.4s linear;
    transition: 0.4s linear;
    -webkit-transition-property: width, background-color;
    -moz-transition-property: width, background-color;
    -ms-transition-property: width, background-color;
    -o-transition-property: width, background-color;
    transition-property: width, background-color;
    -webkit-box-shadow: 0 0 1px 1px rgba(0, 0, 0, 0.25), inset 0 1px rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 1px 1px rgba(0, 0, 0, 0.25), inset 0 1px rgba(255, 255, 255, 0.1);
  }

  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  
  <script src="https://unpkg.com/boxicons@2.0.9/dist/boxicons.js"></script>
  <link href='https://unpkg.com/boxicons@2.0.9/css/boxicons.min.css' rel='stylesheet'>
  <table>
  
  
    <thead class="sticky-thead">
  
      <tr>
        <th>
          <i class='bx bxs-down-arrow' style='color:#ffffff'>IG</i>
          <i class='bx bxs-right-arrow' style='color:#ffffff'>FG</i>
        </th>
        <th scope="col" class="topHead" ">0.990</th>
        <th scope="col " class="topHead "">0.992</th>
        <th scope="col" class="topHead" ">0.994</th>
        <th scope="col " class="topHead "">0.996</th>
      </tr>
    </thead>
  
    <tbody>
      <tr>
        <th scope="row">1.020</th>
        <td class="tool-tip">3.9</td>
        <td class="tool-tip">3.7</td>
        <td class="tool-tip">3.4</td>
        <td class="tool-tip">3.2</td>
      </tr>
  
      <tr>
        <th scope="row">1.022</th>
        <td class="tool-tip">4.2</td>
        <td class="tool-tip">3.9</td>
        <td class="tool-tip">3.7</td>
        <td class="tool-tip">3.4</td>
      </tr>
  
      <tr>
        <th scope="row">1.024</th>
        <td class="tool-tip">4.5</td>
        <td class="tool-tip">4.2</td>
        <td class="tool-tip">3.9</td>
        <td class="tool-tip">3.7</td>
      </tr>
  
      <tr>
        <th scope="row">1.026</th>
        <td class="tool-tip">4.7</td>
        <td class="tool-tip">4.5</td>
        <td class="tool-tip">4.2</td>
        <td class="tool-tip">3.9</td>
      </tr>
    </tbody>
  </table>
  
  <div id="output"></div>

  【问题讨论】：

Answer 1

获取被点击的TD的索引，并使用它来获取标题行中的对应元素。

$('td').click(function() {

  // iniGrav is the Initial Gravity row of th down the left
  var iniGrav = $(this).closest("tr").find('th:eq(0)').text();

  var index = $(this).index();
  // finGrav should be the row of headings for Final Gravity across the top
  var finGrav = $(this).closest("table").find("tr:first th").eq(index).text();


  var abv = $(this).text();
  var msg = "Initial Gravity: " + iniGrav +
    " > Final Gravity: " + finGrav +
    " = " + abv + "% ABV";

  // var title = $(this).title= msg ;
  // alert(msg);

  $('#output').html(msg);
});

body {
  background: #111;
}

#output {
  color: #fff;
  margin: 10px auto;
}

.card-body table {
  width: 100%;
  font-size: 1.2em;
}

.blank-cell,
.row-1 td {
  background: #000;
  color: #fff;
}

td,
th {
  padding: 2px;
  position: relative;
  outline: 0;
}

td {
  text-align: center;
  cursor: pointer;
}

th {
  font-weight: 600;
  color: #0dead0;
}

td:hover {
  background: #530288;
  color: white;
  box-shadow: inset 0 0 6px 0 #fff;
}

td {
  font-size: 14px;
  color: #fff;
  width: 10%;
  margin: 0 auto;
  text-align: center;
  text-indent: 6px;
  margin-bottom: 1em;
  position: relative;
  height: 25px;
  border-radius: 4px;
  border: 1px #111 solid;
  -webkit-transition: 0.4s linear;
  -moz-transition: 0.4s linear;
  -ms-transition: 0.4s linear;
  -o-transition: 0.4s linear;
  transition: 0.4s linear;
  -webkit-transition-property: width, background-color;
  -moz-transition-property: width, background-color;
  -ms-transition-property: width, background-color;
  -o-transition-property: width, background-color;
  transition-property: width, background-color;
  -webkit-box-shadow: 0 0 1px 1px rgba(0, 0, 0, 0.25), inset 0 1px rgba(255, 255, 255, 0.1);
  box-shadow: 0 0 1px 1px rgba(0, 0, 0, 0.25), inset 0 1px rgba(255, 255, 255, 0.1);
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<script src="https://unpkg.com/boxicons@2.0.9/dist/boxicons.js"></script>
<link href='https://unpkg.com/boxicons@2.0.9/css/boxicons.min.css' rel='stylesheet'>
<table>


  <thead class="sticky-thead">

    <tr>
      <th>
        <i class='bx bxs-down-arrow' style='color:#ffffff'>IG</i>
        <i class='bx bxs-right-arrow' style='color:#ffffff'>FG</i>
      </th>
      <th scope="col" class="topHead">0.990</th>
      <th scope="col" class="topHead">0.992</th>
      <th scope="col" class="topHead">0.994</th>
      <th scope="col" class="topHead">0.996</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <th scope="row">1.020</th>
      <td class="tool-tip">3.9</td>
      <td class="tool-tip">3.7</td>
      <td class="tool-tip">3.4</td>
      <td class="tool-tip">3.2</td>
    </tr>

    <tr>
      <th scope="row">1.022</th>
      <td class="tool-tip">4.2</td>
      <td class="tool-tip">3.9</td>
      <td class="tool-tip">3.7</td>
      <td class="tool-tip">3.4</td>
    </tr>

    <tr>
      <th scope="row">1.024</th>
      <td class="tool-tip">4.5</td>
      <td class="tool-tip">4.2</td>
      <td class="tool-tip">3.9</td>
      <td class="tool-tip">3.7</td>
    </tr>

    <tr>
      <th scope="row">1.026</th>
      <td class="tool-tip">4.7</td>
      <td class="tool-tip">4.5</td>
      <td class="tool-tip">4.2</td>
      <td class="tool-tip">3.9</td>
    </tr>
  </tbody>
</table>

<div id="output"></div>