javascript - 如何添加<p>标记项目以动态下拉列表</p>

问题描述

我有一个脚本，它将接受用户输入并用 coma 区分它,。接下来，我的表还将让用户添加列。那么如何从下拉列表中获取所有用户输入existing group并动态显示它呢？add new group例如：用户提交 2 个名为Nurseand的组Doctor，当用户添加新列时，下拉列表应包含现有的和新的组值，即IT, Cleaning, Accountant, Nurse, Doctor 。下拉列表应该能够从existing和add new group记录中动态更新值。

用户输入Nurse和类别：Doctoradd new group

用户添加栏：

预期输出： 下拉列表应实时检索来自existing group和add new group的值IT, Cleaning, Accountant, Nurse, Doctor 。我更喜欢实时的原因是因为用户应该能够从下拉列表中选择他们添加的最新组，而无需刷新网页。

完整代码：

<!DOCTYPE html>
<html>
<head>
<style>
table {
  font-family: arial, sans-serif;
  border-collapse: collapse;
  width: 100%;
}

td, th {
  border: 1px solid #dddddd;
  text-align: left;
  padding: 8px;
}

tr:nth-child(even) {
  background-color: #dddddd;
}
</style>
</head>
<body>

<h2>HTML Table</h2>

<h2>HTML Table</h2>

<table id="member_table">
  <tr>
    <th>Company</th>
    <th>Contact</th>
    <th>Country</th>
  </tr>
  <tr>
    <td>Alfreds Futterkiste</td>
    <td>Maria Anders</td>
    <td>Germany</td>
  </tr>
  <tr>
    <td>Centro comercial Moctezuma</td>
    <td>Francisco Chang</td>
    <td>Mexico</td>
  </tr>
  <tr>
    <td>Ernst Handel</td>
    <td>Roland Mendel</td>
    <td>Austria</td>
  </tr>
  <tr>
    <td>Island Trading</td>
    <td>Helen Bennett</td>
    <td>UK</td>
  </tr>
  <tr>
    <td>Laughing Bacchus Winecellars</td>
    <td>Yoshi Tannamuri</td>
    <td>Canada</td>
  </tr>
  <tr>
    <td>Magazzini Alimentari Riuniti</td>
    <td>Giovanni Rovelli</td>
    <td>Italy</td>
  </tr>
</table>

 <h1>Existing Group</h1>
      <p>IT, Cleaning, Accountant</p>
      <h1>Add New Group</h1>
      <p id="myP"></p>
      <input type="tel" id="group" name="group" placeholder="enter group name">
      <br><br>
      <button type="button" class="btn btn-primary btn-sm">Submit</button>
   

<button onclick="javascript:appendColumn()">Add column</button>

<script>
function createSelectEl(values){
    var select = document.createElement("select");
    select.name = "group1";
    select.id = "groupId"
    // 1st option
    var option = document.createElement("option");
    option.text = 'Select One';
    select.appendChild(option);
    for (const val of values)
    {
        var option = document.createElement("option");
        option.value = val;
        option.text = val;
        select.appendChild(option);
    }
    return select;
}

let groupNum = 1;
const tableEl = document.getElementById('member_table');

// append column to the HTML table
function appendColumn() {

  // open loop for each row and append cell
  for (let i = 0; i < tableEl.rows.length; i++) {
    const values = ["IT", "Cleaning", "Accountant", "Nurse", "Doctor" ];
    createCell(tableEl.rows[i].insertCell(tableEl.rows[i].cells.length), createSelectEl(values), 'col');
    // createCell(tableEl.rows[i].insertCell(tableEl.rows[i].cells.length), i, 'col');
  }

  tableEl.rows[0].querySelector('td:last-child').textContent = 'Group' + groupNum;
  groupNum++;
}

// create DIV element and append to the table cell
function createCell(cell, text, style) {
  var div = document.createElement('div'); // create DIV element
    //txt = document.createTextNode(text); // create text node
  // div.appendChild(txt); // append text node to the DIV
  div.appendChild(text);
  div.setAttribute('class', style); // set DIV class attribute
  div.setAttribute('className', style); // set DIV class attribute for IE (?!)
  cell.appendChild(div); // append DIV to the table cell
}
</script>
<script>
const submit = document.querySelector('button');
const input  = document.querySelector('input');
const select = document.querySelector('select');
const myP    = document.querySelector('p#myP');

submit.addEventListener('click', function(e)
{
  const values = input.value.split(',');
  
  if (myP.innerText == '')
  {
    myP.innerText = values;
  }
  else
  {
    myP.innerText += ', ' + values;
  }
  
});
</script>
</body>
</html>

标签： javascripthtml

javascript - 如何添加
标记项目以动态下拉列表

问题描述

解决方案

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javascript - 如何添加标记项目以动态下拉列表

问题描述

解决方案

推荐阅读

javascript - 如何添加
标记项目以动态下拉列表