javascript - 如何使用 javascript 在 html 表单中显示计算
问题描述
我有一个简短的 HTML 表单，基本上它计算用户输入的结果。我有 4 个部分，a.1、a.2、b.1、b.2 部分。我希望能够添加 a.1 部分的总和并将其显示在小计行上，a.2、b.1 和 b.2 部分也是如此。最后，我想总结获得的总积分并将其显示在页面顶部汇总表的总计行中。请运行我的代码，感谢任何建议或代码片段。我想维护我的代码结构。我是 javascript 新手，希望得到一些建议来帮助我建立理解。谢谢！
var sections = {
section_a: 0,
section_b: 0,
}
//Calculates Section A
function calcSectionA(section) {
let sum = 0;
//Queries All <Select> and looks for class = "select section_a" and add each selected option and assings it to sum
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 / 8 * 100) + '%';
calcRanks();
}
//Calculates Section B
function calcSectionB(section) {
let sum = 0;
//Queries All <Select> and looks for class = "select section_b" and add each selected option and assings it to sum
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>
<td align="center">A</td>
<td align="center">60</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">50</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="right"><b>Totals=</b></td>
<td align="center"><b></b></td>
<td align="center"><b><div></div></b></td>
<td align="center"><b><div><span id="TotalPercent"></span></div></b></td>
<td align="center"></td>
</tr>
</table>
<table>
<th>Section A.1</th>
<tr>
<td>Question 1</td>
<td align="center"></td>
<td align="center">
<select class="select section_a" onChange="calcSectionA('section_a')">
<option value="0">0</option>
<option value="2">2</option>
</select>
</td>
</tr>
<tr>
<td>Question 2</td>
<td align="center"></td>
<td align="center">
<select class="select section_a" onChange="calcSectionA('section_a')">
<option value="0">0</option>
<option value="2">2</option>
</select>
</td>
</tr>
<tr>
<td>Sub Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id=""></div></b></td>
</tr>
<th>Section A.2</th>
<tr>
<td>Question 1</td>
<td align="center"></td>
<td align="center">
<select class="select section_a" onChange="calcSectionA('section_a')">
<option value="0">0</option>
<option value="2">2</option>
</select>
</td>
</tr>
<tr>
<td>Question 2</td>
<td align="center"></td>
<td align="center">
<select class="select section_a" onChange="calcSectionA('section_a')">
<option value="0">0</option>
<option value="2">2</option>
</select>
</td>
</tr>
<tr>
<td>Sub Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id=""></div></b></td>
</tr>
<tr>
<td class="subtotal">Section A. Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id="total_section_a"></div></b></td>
</tr>
<th>Section B.1</th>
<tr>
<td>Question 1</td>
<td align="center"></td>
<td align="center">
<select class="select section_b" onChange="calcSectionB('section_b')">
<option value="0">0</option>
<option value="1">1</option>
</select>
</td>
</tr>
<tr>
<td>Question 2</td>
<td align="center"></td>
<td align="center">
<select class="select section_b" onChange="calcSectionB('section_b')">
<option value="0">0</option>
<option value="1">1</option>
</select>
</td>
</tr>
<tr>
<td>Sub Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id=""></div></b></td>
</tr>
<th>Section B.2</th>
<tr>
<td>Question 1</td>
<td align="center"></td>
<td align="center">
<select class="select section_b" onChange="calcSectionB('section_b')">
<option value="0">0</option>
<option value="1">1</option>
</select>
</td>
</tr>
<tr>
<td>Question 2</td>
<td align="center"></td>
<td align="center">
<select class="select section_b" onChange="calcSectionB('section_b')">
<option value="0">0</option>
<option value="1">1</option>
</select>
</td>
</tr>
<tr>
<td>Sub Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id=""></div></b></td>
</tr>
<tr class="blueHead">
<td class="subtotal">Section B. Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id="total_section_b"></div></b></td>
</tr>
</table>解决方案
我给出了一些你的div和一些span标签id属性。在您的 onchange 函数中，我只是获取了 ddls 的值，并将它们汇总为 A 和 B 部分的单独总数。然后在表格的顶部，我只是抓住了这两个数字并将它们相加在您的 onchange 函数中，因此每次更改值时，总和都会更新。这不是赋予元素价值的最佳方式，但这应该有助于您走上正确的道路。希望这会有所帮助
var sections = {
section_a: 0,
section_b: 0,
}
//Calculates Section A
function calcSectionA(section) {
let sum = 0;
//Queries All <Select> and looks for class = "select section_a" and add each selected option and assings it to sum
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 / 8 * 100) + '%';
calcRanks();
var a1Q1 = document.getElementById('a1').value;
var a1Q2 = document.getElementById('a2').value;
document.getElementById('section_a1subTotal').textContent = parseInt(a1Q1) + parseInt(a1Q2);
var a2Q1 = document.getElementById('a3').value;
var a2Q2 = document.getElementById('a4').value;
document.getElementById('section_a2subTotal').textContent = parseInt(a2Q1) + parseInt(a2Q2);
var aTotals = document.getElementById('summary_section_a').textContent;
var bTotals = document.getElementById('summary_section_b').textContent;
if (aTotals !== "" && bTotals !== "") {
document.getElementById('totalNum').textContent = parseInt(aTotals) + parseInt(bTotals);
}
}
//Calculates Section B
function calcSectionB(section) {
let sum = 0;
//Queries All <Select> and looks for class = "select section_b" and add each selected option and assings it to sum
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();
var b1Q1 = document.getElementById('b1').value;
var b1Q2 = document.getElementById('b2').value;
document.getElementById('section_b1subTotal').textContent = parseInt(b1Q1) + parseInt(b1Q2);
var b2Q1 = document.getElementById('b3').value;
var b2Q2 = document.getElementById('b4').value;
document.getElementById('section_b2subTotal').textContent = parseInt(b2Q1) + parseInt(b2Q2);
var aTotals = document.getElementById('summary_section_a').textContent;
var bTotals = document.getElementById('summary_section_b').textContent;
if (aTotals !== "" && bTotals !== "") {
document.getElementById('totalNum').textContent = parseInt(aTotals) + parseInt(bTotals);
}
}
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>
<td align="center">A</td>
<td align="center">60</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">50</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="right"><b>Totals=</b></td>
<td align="center" id="totalNum"><b></b></td>
<td align="center"><b><div></div></b></td>
<td align="center"><b><div><span id="TotalPercent"></span></div></b></td>
<td align="center"></td>
</tr>
</table>
<table>
<th>Section A.1</th>
<tr>
<td>Question 1</td>
<td align="center"></td>
<td align="center">
<select id="a1" class="select section_a" onChange="calcSectionA('section_a')">
<option value="0">0</option>
<option value="2">2</option>
</select>
</td>
</tr>
<tr>
<td>Question 2</td>
<td align="center"></td>
<td align="center">
<select id="a2" class="select section_a" onChange="calcSectionA('section_a')">
<option value="0">0</option>
<option value="2">2</option>
</select>
</td>
</tr>
<tr>
<td>Sub Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id="section_a1subTotal"></div></b></td>
</tr>
<th>Section A.2</th>
<tr>
<td>Question 1</td>
<td align="center"></td>
<td align="center">
<select id="a3" class="select section_a" onChange="calcSectionA('section_a')">
<option value="0">0</option>
<option value="2">2</option>
</select>
</td>
</tr>
<tr>
<td>Question 2</td>
<td align="center"></td>
<td align="center">
<select id="a4" class="select section_a" onChange="calcSectionA('section_a')">
<option value="0">0</option>
<option value="2">2</option>
</select>
</td>
</tr>
<tr>
<td>Sub Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id="section_a2subTotal"></div></b></td>
</tr>
<tr>
<td class="subtotal">Section A. Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id="total_section_a"></div></b></td>
</tr>
<th>Section B.1</th>
<tr>
<td>Question 1</td>
<td align="center"></td>
<td align="center">
<select id="b1" class="select section_b" onChange="calcSectionB('section_b')">
<option value="0">0</option>
<option value="1">1</option>
</select>
</td>
</tr>
<tr>
<td>Question 2</td>
<td align="center"></td>
<td align="center">
<select id="b2" class="select section_b" onChange="calcSectionB('section_b')">
<option value="0">0</option>
<option value="1">1</option>
</select>
</td>
</tr>
<tr>
<td>Sub Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id="section_b1subTotal"></div></b></td>
</tr>
<th>Section B.2</th>
<tr>
<td>Question 1</td>
<td align="center"></td>
<td align="center">
<select id="b3" class="select section_b" onChange="calcSectionB('section_b')">
<option value="0">0</option>
<option value="1">1</option>
</select>
</td>
</tr>
<tr>
<td>Question 2</td>
<td align="center"></td>
<td align="center">
<select id="b4" class="select section_b" onChange="calcSectionB('section_b')">
<option value="0">0</option>
<option value="1">1</option>
</select>
</td>
</tr>
<tr>
<td>Sub Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id="section_b2subTotal"></div></b></td>
</tr>
<tr class="blueHead">
<td class="subtotal">Section B. Total</td>
<td align="center"><b></b></td>
<td align="center"><b><div id="total_section_b"></div></b></td>
</tr>
</table>jsfiddle：https ://jsfiddle.net/q28yk4j0/1/
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