javascript - 如何使用JavaScript在HTML表单中对结果进行排名？

我有一个简单的HTML表单。共有3个部分(A，B和C部分)。当用户填写表格时，通过显示总点数和百分比来计算每个部分。我想对分数进行排名并将其显示在排名列中，但是似乎无法弄清楚该如何做。例如，如果A区有4分，B区有3分，C区有0分，则A区的等级为1，B区的等级为2，C区的等级为3。理想的是在填写表格时进行排名更改。

我是JavaScript的新手，但是在逻辑上实现该方法时遇到了麻烦。这只是我表格的一个示例。我确实有一个更大的表格，其中包含更多的部分和问题。请运行我的代码，以便您可以看到更好的视觉效果。任何对我有帮助的代码片段和建议将不胜感激。

我已经尝试过在JavaScript中使用if语句，但是就像我说的那样，我不能全神贯注于如何逻辑地做到这一点。

function calcA1R() {
  var Aa1 = document.getElementById('Aa1');
  var Ab1 = document.getElementById('Ab1');
  var Ac1 = document.getElementById('Ac1');

  var Aa1Val = Aa1.options[Aa1.selectedIndex].value;
  var Ab1Val = Ab1.options[Ab1.selectedIndex].value;
  var Ac1Val = Ac1.options[Ac1.selectedIndex].value;

  // returning the sum of the values
  return [parseInt(Aa1Val), parseInt(Ab1Val), parseInt(Ac1Val)].reduce((a, c) => a + c, 0)
}

function calcA1() {
  displaySumA()
}

function displaySumA() {
  document.getElementById('totalA').textContent = calcSumA()
  document.getElementById('TotalASummary').textContent = calcSumA()
  document.getElementById('TotalAPercent').textContent = Math.ceil(calcSumA() / 4 * 100) +'%'
}

function calcSumA() {
  return calcA1R()
}

function calcB1R() {
  var Ba1 = document.getElementById('Ba1');
  var Bb1 = document.getElementById('Bb1');
  var Bc1 = document.getElementById('Bc1');

  var Ba1Val = Ba1.options[Ba1.selectedIndex].value;
  var Bb1Val = Bb1.options[Bb1.selectedIndex].value;
  var Bc1Val = Bc1.options[Bc1.selectedIndex].value;

  // returning the sum of the values
  return [parseInt(Ba1Val), parseInt(Bb1Val), parseInt(Bc1Val)].reduce((a, c) => a + c, 0)
}

function calcB1() {
  displaySumB()
}

function displaySumB() {
  document.getElementById('totalB').textContent = calcSumB()
  document.getElementById('TotalBSummary').textContent = calcSumB()
  document.getElementById('TotalBPercent').textContent = Math.ceil(calcSumB() / 4 * 100) +'%'
}

function calcSumB() {
  return calcB1R()
}

function calcC1R() {
  var Ba1 = document.getElementById('Ca1');
  var Bb1 = document.getElementById('Cb1');
  var Bc1 = document.getElementById('Cc1');

  var Ca1Val = Ca1.options[Ca1.selectedIndex].value;
  var Cb1Val = Cb1.options[Cb1.selectedIndex].value;
  var Cc1Val = Cc1.options[Cc1.selectedIndex].value;

  // returning the sum of the values
  return [parseInt(Ca1Val), parseInt(Cb1Val), parseInt(Cc1Val)].reduce((a, c) => a + c, 0)
}

function calcC1() {
  displaySumC()
}

function displaySumC() {
  document.getElementById('totalC').textContent = calcSumC()
  document.getElementById('TotalCSummary').textContent = calcSumC()
  document.getElementById('TotalCPercent').textContent = Math.ceil(calcSumC() / 4 * 100) +'%'
}

function calcSumC() {
  return calcC1R()
}

<table>
   <tr>
     <th>Category |</th>
     <th>Points Possible |</th>
     <th>Points Awarded |</th>
     <th>Percent Achieved |</th>
     <th>Ranking</th>
   </tr>
   <tr>
     <td align="center">A</td>
     <td align="center">4</td>
     <td align="center"><b><div><span id="TotalASummary"></span></div></b></td>
     <td align="center"><b><div><span id="TotalAPercent"></span></div></b></td>
     <td bgcolor="#92d050" align="center"></td>
   </tr>
   <tr>
     <td align="center">B</td>
     <td align="center">4</td>
     <td align="center"><b><div><span id="TotalBSummary"></span></div></td>
     <td align="center"><b><div><span id="TotalBPercent"></span></div></td>
     <td bgcolor="#92d050" align="center"></td>
   </tr>
   <tr>
     <td align="center">C</td>
     <td align="center">4</td>
     <td align="center"><b><div><span id="TotalCSummary"></span></div></td>
     <td align="center"><b><div><span id="TotalCPercent"></span></div></td>
     <td bgcolor="#92d050" align="center"></td>
   </tr>
</table>
<table>
  <tr>
    <th>Section A.</th>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td></td>
  </tr>
  <tr>
    <td><b>A.1</b></td>
    <td><b>Value</b></td>
    <td><b>Awarded</b></td>
  </tr>
  <tr>
    <td>a)</td>
    <td align="center">1</td>
    <td align="center"><select class="select" onChange="calcA1();" id="Aa1">
                      <option value="0">0</option>
                      <option value="1">1</option>
                    </select></td>
  </tr>
  <tr>
    <td>b)</td>
    <td align="center">1</td>
    <td align="center"><select class="select" onChange="calcA1();" id="Ab1">
                       <option value="0">0</option>
                       <option value="1">1</option>
                       </select></td>
  </tr>
  <tr>
    <td>c)</td>
    <td align="center">2</td>
    <td align="center"><select class="select" onChange="calcA1();" id="Ac1">
                       <option value="0">0</option>
                       <option value="2">2</option>
                       </select></td>
  </tr>
  <tr>
    <td class="subtotal">Section A. Total</td>
    <td align="center"><b>2</b></td>
    <td align="center"><b><div><span id="totalA"></span></div></b></td>
  </tr>

  <tr>
    <th>Section B.</th>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td></td>
  </tr>
  <tr>
    <td><b>B.1</b></td>
    <td><b>Value</b></td>
    <td><b>Awarded</b></td>
  </tr>
  <tr>
    <td>a)</td>
    <td align="center">1</td>
    <td align="center"><select class="select" onChange="calcB1();" id="Ba1">
                      <option value="0">0</option>
                      <option value="1">1</option>
                    </select></td>
  </tr>
  <tr>
    <td>b)</td>
    <td align="center">1</td>
    <td align="center"><select class="select" onChange="calcB1();" id="Bb1">
                       <option value="0">0</option>
                       <option value="1">1</option>
                       </select></td>
  </tr>
  <tr>
    <td>c)</td>
    <td align="center">2</td>
    <td align="center"><select class="select" onChange="calcB1();" id="Bc1">
                       <option value="0">0</option>
                       <option value="2">2</option>
                       </select></td>
  </tr>

  <tr>
    <td class="subtotal">Section B. Total</td>
    <td align="center"><b>2</b></td>
    <td align="center"><b><div><span id="totalB"></span></div></b></td>
  </tr>
  <tr>
    <th>Section C.</th>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td></td>
  </tr>
  <tr>
    <td><b>C.1</b></td>
    <td><b>Value</b></td>
    <td><b>Awarded</b></td>
  </tr>
  <tr>
    <td>a)</td>
    <td align="center">1</td>
    <td align="center"><select class="select" onChange="calcC1();" id="Ca1">
                      <option value="0">0</option>
                      <option value="1">1</option>
                    </select></td>
  </tr>
  <tr>
    <td>b)</td>
    <td align="center">1</td>
    <td align="center"><select class="select" onChange="calcC1();" id="Cb1">
                       <option value="0">0</option>
                       <option value="1">1</option>
                       </select></td>
  </tr>
  <tr>
    <td>c)</td>
    <td align="center">2</td>
    <td align="center"><select class="select" onChange="calcC1();" id="Cc1">
                       <option value="0">0</option>
                       <option value="2">2</option>
                       </select></td>
  </tr>
  <tr>
    <td class="subtotal">Section C. Total</td>
    <td align="center"><b>2</b></td>
    <td align="center"><b><div><span id="totalC"></span></div></b></td>
  </tr>
</table>

最佳答案

在这里，我们花了一点时间清理您的一些代码。我添加了Rank函数，这可能不是最好的方法，但它可以工作。另外，我删除了重复的代码，并将其设置为一个函数，该函数可以处理每个部分的所有评分。

var sections = {
  section_a: 0,
  section_b: 0,
  section_c: 0
}

function calcSection(section) {
  let sum = 0;
  document.querySelectorAll('select.'+section)
  .forEach((input)=>{
    sum += parseInt(input.options[input.selectedIndex].value);
  });
  sections[section] = sum;
  document.getElementById('total_'+section).textContent = sum;
  document.getElementById('summary_'+section).textContent = sum
  document.getElementById('percent_'+section).textContent = Math.ceil(sum / 4 * 100) +'%';
  calcRanks();
}

function calcRanks() {
  let sectionsArr = [];
  let keys = Object.keys(sections);
  keys.forEach((key, i)=>{
    sectionsArr.push({ section: key, value: sections[key], rank: 0 });
    if(i + 1 === keys.length) {
      sectionsArr.sort((a,b)=>{return a.value > b.value ? -1 : a.value < b.value ? 1 : 0});
      let lastIndex = 0;
      for(let i = 1; i < sectionsArr.length; i++){
        let section = sectionsArr[i];
        let lastSection = sectionsArr[lastIndex];
        //console.log(lastSection.value, section.value);
        if(lastSection.value > section.value) {
          sectionsArr[i].rank = lastSection.rank + 1;
        }
        if(lastSection.value === section.value) {
          sectionsArr[i].rank = lastSection.rank;
        }
        lastIndex = i;
      }
      displayRanks(sectionsArr);
    }
  });
}

function displayRanks(sections) {
  sections.forEach((section)=>{
    document.getElementById('rank_'+section.section).textContent = section.rank +1;
  });
}

<table>
   <tr>
     <th>Category |</th>
     <th>Points Possible |</th>
     <th>Points Awarded |</th>
     <th>Percent Achieved |</th>
     <th>Ranking</th>
   </tr>
   <tr class="section_a">
     <td align="center">A</td>
     <td align="center">4</td>
     <td align="center"><b><div><span id="summary_section_a"></span></div></b></td>
     <td align="center"><b><div><span id="percent_section_a"></span></div></b></td>
     <td bgcolor="#92d050" align="center" id="rank_section_a"></td>
   </tr>
   <tr>
     <td align="center">B</td>
     <td align="center">4</td>
     <td align="center"><b><div><span id="summary_section_b"></span></div></td>
     <td align="center"><b><div><span id="percent_section_b"></span></div></td>
     <td bgcolor="#92d050" align="center" id="rank_section_b"></td>
   </tr>
   <tr>
     <td align="center">C</td>
     <td align="center">4</td>
     <td align="center"><b><div><span id="summary_section_c"></span></div></td>
     <td align="center"><b><div><span id="percent_section_c"></span></div></td>
     <td bgcolor="#92d050" align="center" id="rank_section_c"></td>
   </tr>
</table>



<table>
  <tr>
    <th>Section A.</th>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td></td>
  </tr>
  <tr>
    <td><b>A.1</b></td>
    <td><b>Value</b></td>
    <td><b>Awarded</b></td>
  </tr>
  <tr>
    <td>a)</td>
    <td align="center">1</td>
    <td align="center"><select class="select section_a" onChange="calcSection('section_a')">
                      <option value="0">0</option>
                      <option value="1">1</option>
                    </select></td>
  </tr>
  <tr>
    <td>b)</td>
    <td align="center">1</td>
    <td align="center"><select class="select section_a" onChange="calcSection('section_a')">
                       <option value="0">0</option>
                       <option value="1">1</option>
                       </select></td>
  </tr>
  <tr>
    <td>c)</td>
    <td align="center">2</td>
    <td align="center"><select class="select section_a" onChange="calcSection('section_a')">
                       <option value="0">0</option>
                       <option value="2">2</option>
                       </select></td>
  </tr>
  <tr>
    <td class="subtotal">Section A. Total</td>
    <td align="center"><b>2</b></td>
    <td align="center"><b><div><span id="total_section_a"></span></div></b></td>
  </tr>

  <tr>
    <th>Section B.</th>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td></td>
  </tr>
  <tr>
    <td><b>B.1</b></td>
    <td><b>Value</b></td>
    <td><b>Awarded</b></td>
  </tr>
  <tr>
    <td>a)</td>
    <td align="center">1</td>
    <td align="center"><select class="select section_b" onChange="calcSection('section_b')">
                      <option value="0">0</option>
                      <option value="1">1</option>
                    </select></td>
  </tr>
  <tr>
    <td>b)</td>
    <td align="center">1</td>
    <td align="center"><select class="select section_b" onChange="calcSection('section_b')">
                       <option value="0">0</option>
                       <option value="1">1</option>
                       </select></td>
  </tr>
  <tr>
    <td>c)</td>
    <td align="center">2</td>
    <td align="center"><select class="select section_b" onChange="calcSection('section_b')">
                       <option value="0">0</option>
                       <option value="2">2</option>
                       </select></td>
  </tr>

  <tr>
    <td class="subtotal">Section B. Total</td>
    <td align="center"><b>2</b></td>
    <td align="center"><b><div><span id="total_section_b"></span></div></b></td>
  </tr>
  <tr>
    <th>Section C.</th>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td></td>
  </tr>
  <tr>
    <td><b>C.1</b></td>
    <td><b>Value</b></td>
    <td><b>Awarded</b></td>
  </tr>
  <tr>
    <td>a)</td>
    <td align="center">1</td>
    <td align="center"><select class="select section_c" onChange="calcSection('section_c')">
                      <option value="0">0</option>
                      <option value="1">1</option>
                    </select></td>
  </tr>
  <tr>
    <td>b)</td>
    <td align="center">1</td>
    <td align="center"><select class="select section_c" onChange="calcSection('section_c')">
                       <option value="0">0</option>
                       <option value="1">1</option>
                       </select></td>
  </tr>
  <tr>
    <td>c)</td>
    <td align="center">2</td>
    <td align="center"><select class="select section_c" onChange="calcSection('section_c')">
                       <option value="0">0</option>
                       <option value="2">2</option>
                       </select></td>
  </tr>
  <tr>
    <td class="subtotal">Section C. Total</td>
    <td align="center"><b>2</b></td>
    <td align="center"><b><div><span id="total_section_c"></span></div></b></td>
  </tr>
</table>