Save the input the user make even after reload/refresh

Save the input the user make even after reload/refresh - javascript

I wanted to to add a function that every time the user refresh, reload or even close the page, the user to able to see the data whatever the user had entered previously or choose in the <select>.
Also when the user make an update and refresh they show be able to see the change.
let doc, htm, bod, nav, M, I, S, Q, hC, aC, rC, tC; // for use on other loads
addEventListener('load', () => {
doc = document;
htm = doc.documentElement;
bod = doc.body;
nav = navigator;
M = tag => doc.createElement(tag);
I = id => doc.getElementById(id);
mobile = /Mobi/i.test(nav.userAgent);
S = (selector, within) => {
let w = within || doc;
return w.querySelector(selector);
}
Q = (selector, within) => {
let w = within || doc;
return w.querySelectorAll(selector);
}
hC = (node, className) => {
return node.classList.contains(className);
}
aC = (node, ...classNames) => {
node.classList.add(...classNames);
return aC;
}
rC = (node, ...classNames) => {
node.classList.remove(...classNames);
return rC;
}
tC = (node, className) => {
node.classList.toggle(className);
return tC;
}
// small Library above - magic below can be put on another page using a load Event *(except // end load line)*
const trs = Q('tbody>tr'),
trsL = trs.length,
prs = Q('tfoot>tr>td+td'),
prsM = prs.length - 1,
ya = [];
function showAverages() {
let total = 0;
for (let p = 0, c, t, l = ya.length; p < prsM; p++) {
c = 0;
for (let i = 0; i < l; i++) {
c += ya[i][p];
}
t = (c / l * 100).toFixed(2);
prs[p].textContent = t;
total += (+t);
}
prs[prsM].textContent = (total / prsM).toFixed(2);
var element = document.getElementById(prs[prsM]);
$("#element").html((total / prsM).toFixed(2) + "%");
}
for (let i = 0, r, sels, y; i < trsL; i++) {
r = trs[i];
sels = Q('select', r);
ya.push([]);
for (let n = 0, s, q = sels.length; n < q; n++) {
s = sels[n];
s.value = 'Yes';
y = s.value === 'Yes' ? 1 : 0;
ya[i].push(y);
s.oninput = () => {
ya[i][n] = s.value === 'Yes' ? 1 : 0;
showAverages();
}
}
}
showAverages();
});
* {
/* set font-size separate to avoid white space issues */
box-sizing: border-box;
font-size: 0;
padding: 0;
margin: 0;
}
p {
font: italic 16px Georgia, Garamond, serif;
}
/* added ---------- */
p span {
color: black;
font: bold 16px Georgia, Garamond, serif;
}
/* ---------------- */
table {
width: 100%;
table-layout: fixed;
border-collapse: collapse;
}
thead *,
tfoot * {
font: bold 16px Arial, san-serif;
}
tbody * {
font: 15px Arial, sans-serif;
}
td,
th {
width: 90px;
border: 1px solid #ccc;
text-align: left;
padding: 8px;
}
tr:nth-child(even) {
background: #ddd;
}
tfoot>tr>td:not(:last-child):after {
content: '%';
font-weight: bold;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!DOCTYPE html>
<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'>
<head>
<meta charset='UTF-8' />
<meta name='viewport' content='width=device-width, height=device-height, initial-scale:1, user-scalable=no' />
<title>Finding Average</title>
</head>
<body>
<div>
<p>Finding and Display Average: <span id="element"></span><br><br><br></p>
</div>
<!--the total average goes here-->
<table>
<thead>
<tr>
<th>Month</th>
<th>Jan</th>
<th>Feb</th>
<th>Mar</th>
<th>Apr</th>
<th>May</th>
<th>Jun</th>
<th>Jul</th>
<th>Aug</th>
<th>Sept</th>
<th>Oct</th>
<th>Nov</th>
<th>Dec</th>
<th>Total Average</th>
</tr>
</thead>
<tfoot>
<tr class="percent_row">
<td>Response Percent</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
</td>
</tr>
</tfoot>
<tbody>
<tr class="select_row">
<td>Bought Office Supplies</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
</td>
</tr>
<tr class="select_row">
<td>Saving's Over $25,000</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
</td>
</tr>
<tr class="select_row">
<td>Savings</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
</td>
</tr>
<tr class="select_row">
<td>Over Budget</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
</td>
</tr>
<tr class="select_row">
<td>Over Budget $10,000</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
</td>
</tr>
<tr class="select_row">
<td>Over Budget $20,000</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
</td>
</tr>
</tbody>
</table>

The localStorage and sessionStorage properties allow to save key/value pairs in a web browser.
The localStorage object stores data with no expiration date. The data will not be deleted when the browser is closed, and will be available the next day, week, or year.
The localStorage property is read-only.
Example:
localStorage.setItem("lastname", "Smith");
// Retrieve
document.getElementById("result").innerHTML = localStorage.getItem("lastname");

If you want to store for example your data ya to local storage, you have to stringify the data, because localstorage accepts only string:
localStorage.setItem("savetab", JSON.stringify(ya));
to retrieve data, you do invers:
ya = JSON.parse(localStorage.getItem("savetab"));
after you rebuild your display yes or no for each row/column
ya is an array of 12 columns and 6 rows so 72 selects
so when you loop over ya, you'll do something like that to reload all selects with data saved:
for(var row = 0; row < 6; row++){
for(var col = 0; col < 12; col++){
$("select").eq(row * 12 + col).val(ya[row, col] == 1 ? "Yes" : "No");
}
}
following your sample:
you execute the localStorage.setItem inside showAverages()
and before the last line you load the data saved
//restore your data here before calling the function average
showAverages();
});

Related

How to select only one row in table with checkbox

I have a table with x numbers of rows and 4 columns, one column is checkbox and other three are readonly selectboxs. I want the user to select just 1 row to be editable by checking checkbox in first column then if he check another checkbox in another row, the checkbox he previously checked get unchecked and row get readonly again.
So I want the user to select 1 row only to edit and others be readonly.
here is my code but it is not working.
$(document).ready(function(){
$('.col1, .col2, .col3').attr('disabled', true)
selectRow();
$('.tbl').on('change', '.selectRow', selectRow);
function selectRow() {
$('.tbl tbody tr').each(function () {
$(this).find('.selectRow').each(function () {
var checkedRow = $(this).closest('tr').find('input:checkbox:checked'),
col1 = $(this).closest('tr').find('.col1'),
col2 = $(this).closest('tr').find('.col2'),
col3 = $(this).closest('tr').find('col3');
if (checkedRow){
$('.col1, .col2, .col3').removeAttr('disabled')
checkedRow.siblings().prop('checked', false);
}else{
$('.col1, .col2, .col3').attr('disabled', true)
checkedRow.siblings().prop('checked', false);
}
});
});
}
});
<table class="tbl">
<tr>
<td><input type="checkbox" name="check1" class = "selectRow" /> </td>
<td>
<select class="col1">
<option id="col1o1">A</option>
<option id="col1o2">B</option>
<option id="col1o3">C</option>
<option id="col1o4">E</option>
</select>
</td>
<td>
<select class="col2">
<option id="col2o1">A</option>
<option id="col2o2">B</option>
<option id="col2o3">C</option>
<option id="col2o4">E</option>
</select>
</td>
<td>
<select class="col3">
<option id="col3o1">A</option>
<option id="col3o2">B</option>
<option id="col3o3">C</option>
<option id="col3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
</table>
this is my code:

Without jQuery and using event delegation things may be somewhat simpler:
document.addEventListener(`click`, handle);
// disable all selectors initially
document.querySelectorAll(`td select`)
.forEach(s => s.setAttribute(`disabled`, true));
function handle(evt) {
// only do something if a checkbox was clicked
if (evt.target.type === `checkbox`) {
const isChecked = evt.target.checked;
const selectedRow = evt.target.closest(`tr`);
// reset checkboxes, row coloring and disabled state
document.querySelectorAll(`input[type='checkbox']`)
.forEach(cb => {
cb.checked = cb !== evt.target ? false : isChecked;
const row = cb.closest(`tr`);
row.classList[isChecked && row === selectedRow ?
`add` : `remove`](`selected`);
[...row.querySelectorAll(`select`)].filter(r => r !== selectedRow)
.forEach(s => s.setAttribute(`disabled`, true));
selectedRow.querySelectorAll(`select`)
.forEach(s => s[isChecked ?
`removeAttribute` : `setAttribute`](`disabled`, true));
});
}
}
body {
margin: 2rem;
}
tr.selected {
background-color: lightgreen;
}
<table class="tbl">
<tr>
<td><input type="checkbox" name="check1" class="selectRow" /> </td>
<td>
<select class="col1">
<option id="col1o1">A</option>
<option id="col1o2">B</option>
<option id="col1o3">C</option>
<option id="col1o4">E</option>
</select>
</td>
<td>
<select class="col2">
<option id="col2o1">A</option>
<option id="col2o2">B</option>
<option id="col2o3">C</option>
<option id="col2o4">E</option>
</select>
</td>
<td>
<select class="col3">
<option id="col3o1">A</option>
<option id="col3o2">B</option>
<option id="col3o3">C</option>
<option id="col3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
</table>
Here's an even more simplified version, acting on the table rows
document.addEventListener(`click`, handle);
// create the table dynamically to keep demo lean
createTable();
function handle(evt) {
if (evt.target.type === `checkbox`) {
const selectedRow = evt.target.closest(`tr`);
document.querySelectorAll(`tr`)
.forEach( row => {
// not selected
if (row !== selectedRow) {
row.querySelector(`[type=checkbox]`).checked = false;
row.classList.remove(`selected`);
return row.querySelectorAll(`select`)
.forEach(s => s.setAttribute(`disabled`, true));
}
// selected
row.classList[[`remove`, `add`][+evt.target.checked]](`selected`);
row.querySelectorAll(`select`).forEach(s =>
s[`${[`set`,`remove`][+evt.target.checked]}Attribute`](`disabled`, true));
});
}
}
function createTable() {
const table = document.createElement(`table`);
const repeat = (str, n) => Array(n + 1).join(str);
const select = `<td><select>
<option>A</option>
<option>B</option>
<option>C</option>
<option>E</option></select></td>`;
const row = `<tr>
<td><input type="checkbox" /></td>
${repeat(select, 3)}</tr>`;
table.insertAdjacentHTML(`beforeend`, repeat(row, 3));
document.body.appendChild(table);
// disable all selectors initially
document.querySelectorAll(`td select`)
.forEach(s => s.setAttribute(`disabled`, true));
}
body {
margin: 2rem;
}
tr.selected {
background-color: lightgreen;
}
tr td:nth-child(1) {
padding-right: 6px;
}

The issue is because checkedRow holds a jQuery object. When you use that in an if condition it will always equate to true. You instead need to get the checked property from that element and use that in the condition instead.
Also note that the logic can be made much more succinct and extensible through the use of common selectors instead of incremental ones. In addition, you should look to add the disabled attribute to the HTML directly. Adding it via JS means that there will be a visible flash where the element is loaded as enabled, then when the DOM loads it will be disabled which is not good for your UX.
jQuery($ => {
selectRow();
$('.tbl').on('change', '.selectRow', selectRow);
function selectRow() {
$('.tbl tbody tr').each(function() {
let $row = $(this);
let $checkbox = $row.find('.selectRow');
$row.find('select').prop('disabled', !$checkbox.prop('checked'));
});
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table class="tbl">
<tr>
<td><input type="checkbox" name="check1" class="selectRow" /> </td>
<td>
<select class="col1" disabled="disabled">
<option id="col1o1">A</option>
<option id="col1o2">B</option>
<option id="col1o3">C</option>
<option id="col1o4">E</option>
</select>
</td>
<td>
<select class="col2" disabled="disabled">
<option id="col2o1">A</option>
<option id="col2o2">B</option>
<option id="col2o3">C</option>
<option id="col2o4">E</option>
</select>
</td>
<td>
<select class="col3" disabled="disabled">
<option id="col3o1">A</option>
<option id="col3o2">B</option>
<option id="col3o3">C</option>
<option id="col3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" class="selectRow" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" class="selectRow" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
</table>

This works great! uncheck all checkboxes except the one having current focus '.tbl [type="checkbox"]:not(:focus)' then manipulate the select boxes
$(document).ready(function(){
$('.tbl [type="checkbox"]').on('click', function() {
$('.tbl [type="checkbox"]:not(:focus)').prop('checked', false);
$('.tbl select').attr('disabled', true);
$(this).parent().parent().find('select').attr('disabled', !$(this).prop('checked'));
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table class="tbl">
<tr>
<td><input type="checkbox" name="check1" class = "selectRow" /> </td>
<td>
<select class="col1" disabled>
<option id="col1o1">A</option>
<option id="col1o2">B</option>
<option id="col1o3">C</option>
<option id="col1o4">E</option>
</select>
</td>
<td>
<select class="col2" disabled>
<option id="col2o1">A</option>
<option id="col2o2">B</option>
<option id="col2o3">C</option>
<option id="col2o4">E</option>
</select>
</td>
<td>
<select class="col3" disabled>
<option id="col3o1">A</option>
<option id="col3o2">B</option>
<option id="col3o3">C</option>
<option id="col3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1" disabled>
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2" disabled>
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3" disabled>
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1" disabled>
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2" disabled>
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3" disabled>
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
</table>

Calculating total average percentage

trying to calculate the average of from Response Percent of each months from Jan to Dec display the average in the total average. I tried all the possible ways by looking at examples and posts from online but nothing seems to be working.
In new to javascript and learning throught online class and looking posts online but its not helping. can any one help me figure it out
const $select_rows = $('.select_row');
const $percent_row = $('.percent_row');
function update_column(col_index) {
const child_index = col_index + 2; // 1 indexed plus 1 for row heading
const $selects = $select_rows.find('td:nth-child(' + child_index + ') select');
if ($selects.length) {
let yes_count = 0;
$selects.each(function() {
if ($(this).val() == 'Yes') {
yes_count++;
}
});
$percent_row.find('td:nth-child(' + child_index + ') .cnt-percent-y').text((yes_count * 100 / $selects.length).toFixed(2));
}
}
function setup() {
$select_rows.each(function() {
$(this).find('select').each(function(index) {
const col_index = index;
$(this).change(function() {
update_column(col_index);
});
update_column(col_index);
});
});
}
setup();
function average(perResponse) {
var total = 0;
var perResponse;
for (var i = 0; i < perResponse.length; i++) {
total += perResponse[i];
}
var avg = total / source.length;
alert(avg)
document.getElementById("result").innerHTML = avg;
}
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;
}
<title>Finding Average</title>
</head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<body>
<p style="font-family:georgia,garamond,serif;font-size:16px;font-style:italic;">
Finding Average & Calculation of Total Percentage
</p>
<table>
<thead>
<tr>
<th>Month</th>
<th>Jan</th>
<th>Feb</th>
<th>Mar</th>
<th>Apr</th>
<th>May</th>
<th>Jun</th>
<th>Jul</th>
<th>Aug</th>
<th>Sept</th>
<th>Oct</th>
<th>Nov</th>
<th>Dec</th>
<th>Total Average</th>
</tr>
</thead>
<tbody>
<tr class="select_row">
<td>Bought Office Supplies</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</tr>
<tr class="select_row">
<td>Saving's Over $25,000</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</tr>
<tr class="select_row">
<td>Savings</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</tr>
<tr class="select_row">
<td>Over Budget</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</tr>
<tr class="select_row">
<td>Over Budget $10,000</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</tr>
<tr class="select_row">
<td>Over Budget $20,000</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</tr>
</tbody>
<tfoot>
<tr class="percent_row">
<td>Response Percent</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td> //Here goes the average total from calculation from the average from Jan to Dec
<td></td>
</tr>
</tfoot>
</table>

Looking to your "average()" function:
"source.length" in your is not initialized - or maybe you intended to use "perResponse.length" instead?
Aside from that "var perRseponse;" seems to be an unnecessary declaration of your parameter (plus typo).

Calculate Percentage of YES/NO and find average

I'm trying to to get the percentage of Yes or No on the HTML Table from the response of the user from the questions of each month and then display the average percentage in the average in the average column of each month (For example if the the user selects 'no'for saving and 'yes' for over budget it should display the average
50% for the month of Jan) but all I'm getting is NaN% for each month . I tried creating a script of each month but shows the same result in average.
Then I trying to add all the Response Percent and get its average and display the average in the total average under total response.
HTML, CSS and JS:
$(function() {
mon_jan();
});
function mon_jan() {
var target_span = $('#span1');
count_yes_no(target_span);
}
function count_yes_no(spn) {
var yes = 0;
var no = 0;
var l = 0;
spn.find('select').each(function() {
if ($(this).val() == 'Yes') {
yes++;
}
if ($(this).val() == 'No') {
no++;
}
l++;
});
// update count values summary
$('.cnt-yes').text(yes);
$('.cnt-no').text(no);
$('.len').text(parseInt(l));
$('.cnt-percent-y').text((yes * 100 / l).toFixed(2));
$('.cnt-percent-n').text((no * 100 / l).toFixed(2));
}
$(function() {
mon_feb();
});
function mon_feb() {
var target_span = $('#span1');
count_yes_no(target_span);
}
function count_yes_no(spn) {
var yes = 0;
var no = 0;
var l = 0;
spn.find('select').each(function() {
if ($(this).val() == 'Yes') {
yes++;
}
if ($(this).val() == 'No') {
no++;
}
l++;
});
// update count values summary
$('.cnt-yes').text(yes);
$('.cnt-no').text(no);
$('.len').text(parseInt(l));
$('.cnt-percent-y').text((yes * 100 / l).toFixed(2));
$('.cnt-percent-n').text((no * 100 / l).toFixed(2));
}
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;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<body>
<h1>Finding Average -- Excel Spreadsheet to get similiar results</h1>
<table>
<thead>
<tr>
<th>Month</th>
<th>Jan</th>
<th>Feb</th>
<th>Mar</th>
<th>Apr</th>
<th>May</th>
<th>Jun</th>
<th>Jul</th>
<th>Aug</th>
<th>Sept</th>
<th>Oct</th>
<th>Nov</th>
<th>Dec</th>
<th>Total Average</th>
</tr>
</thead>
<tbody>
<tr>
<span id="span1">
<td>Savings</td>
<td>
<select onchange="mon_jan();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="mon_feb();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</span>
</tr>
<tr>
<td>Over Budget</td>
<td>
<select onchange="mon_jan();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="mon_feb();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select onchange="ch_sel();">
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</tr>
</tbody>
<tfoot>
<td>Response Percent</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td></td>
</tfoot>
</table>

One problem is that span is not a valid child element of a tr. Removing the span and giving the id to the tr would probably work better.
My jQuery is pretty rusty but I took a stab at a partially working solution in case it helps:
const $select_rows = $('.select_row');
const $percent_row = $('.percent_row');
function update_column(col_index) {
const child_index = col_index + 2; // 1 indexed plus 1 for row heading
const $selects = $select_rows.find('td:nth-child(' + child_index + ') select');
if($selects.length) {
let yes_count = 0;
$selects.each(function() {
if($(this).val() == 'Yes') {
yes_count++;
}
});
$percent_row.find('td:nth-child(' + child_index + ') .cnt-percent-y').text((yes_count * 100 / $selects.length).toFixed(2));
}
}
function setup() {
$select_rows.each(function() {
$(this).find('select').each(function(index) {
const col_index = index;
$(this).change(function() {
update_column(col_index);
});
update_column(col_index);
});
});
}
setup();
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;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<body>
<h1>Finding Average -- Excel Spreadsheet to get similiar results</h1>
<table>
<thead>
<tr>
<th>Month</th>
<th>Jan</th>
<th>Feb</th>
<th>Mar</th>
<th>Apr</th>
<th>May</th>
<th>Jun</th>
<th>Jul</th>
<th>Aug</th>
<th>Sept</th>
<th>Oct</th>
<th>Nov</th>
<th>Dec</th>
<th>Total Average</th>
</tr>
</thead>
<tbody>
<tr class="select_row">
<td>Savings</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</tr>
<tr class="select_row">
<td>Over Budget</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
<td>
<select>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</tr>
</tbody>
<tfoot>
<tr class="percent_row">
<td>Response Percent</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td>
<div class="Percentage"><span class="cnt-percent-y">0</span>% <br></div>
</td>
<td></td>
</tr>
</tfoot>
</table>

Navigating around html table

I have a html table 40 x 20. each cell is filled with a selector. each selector has 4 options.
At the moment i have to select by using the mouse each value. is there a way to set it so that i can click and drag the mouse over a group of cells at a timed then press the value on the key board to choose that option for all those cells.
Also it would be really handy if there was a way to set it so I could change the selected cell using the keyboard arrows.
does anyone know a way for both or either of these above?
a little sample of how my table is set up:
<tr id="row_1">
<td> row 1</td>
<td id="row_1_col_1">
<center>
<select style="background-color: #ceedd0;" id="row_1_select_1" onchange="changeSelect('row_1','_col_1','_select_1')" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</center>
</td>
<td id="row_1_col_2">
<center>
<select style="background-color: #ceedd0;" id="row_1_select_2" onchange="changeSelect('row_1','_col_2','_select_2')" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</center>
</td>
<td id="row_1_col_3">
<center>
<select style="background-color: #ceedd0;" id="row_1_select_3" onchange="changeSelect('row_1','_col_3','_select_3')" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</center>
</td>

a small trick you can go with, using a hidden checkbox, and bind event on it,,
just try the snippet.
(click on "Select" of each and try to change one of them.)
var slct = document.querySelectorAll('.hidden');
var func = document.querySelectorAll('select');
var i, x, chng;
for (i = 0; i < func.length; i++) {
func[i].onchange = function() {
chng = this.selectedIndex;
for (x = 0; x < slct.length; x++) {
if (slct[x].checked) {
slct[x].nextSibling.nextSibling.selectedIndex = chng;
}
}
}
}
.hidden {
display: none;
}
label {
background: lightgray;
padding: 0.10rem 2rem;
}
.hidden:checked~label {
background: powderblue;
color: white;
}
<tr id="row_1">
<td> row 1</td>
<td id="row_1_col_1">
<center><input type="checkbox" id="toggle" class="hidden"><label for="toggle">Select</label><select style="background-color: #ceedd0;" id="row_1_select_1" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</center>
</td>
<td id="row_1_col_2">
<center><input type="checkbox" id="toggle2" class="hidden"><label for="toggle2">Select</label><select style="background-color: #ceedd0;" id="row_1_select_2" onchange="changeSelect('row_1','_col_2','_select_2')" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</center>
</td>
<td id="row_1_col_3">
<center><input type="checkbox" id="toggle3" class="hidden"><label for="toggle3">Select</label><select style="background-color: #ceedd0;" id="row_1_select_3" onchange="changeSelect('row_1','_col_3','_select_3')" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</center>
</td>
EDIT: as per your request, i added another snippet to use the selectionbox using span without Checkbox. also added multi select when mouse-down over the spans just try
click and hold mousedown then move across the elements,
and try single clicks
I hope this meets what exactly you need.
var tgl = document.querySelectorAll('#selectbox');
var func = document.querySelectorAll('select');
var i, x, chng, actv;
var mouseDown = false;
for (i = 0; i < func.length; i++) {
func[i].addEventListener('change', function() {
var slct = document.querySelectorAll('.activated');
chng = this.selectedIndex;
for (x = 0; x < slct.length; x++) {
slct[x].firstElementChild.selectedIndex = chng;
}
});
}
tgl.forEach((span) => {
span.addEventListener('click', function() {
actv = this;
if (actv.classList.contains('activated')) {
actv.classList.remove('activated');
} else {
actv.classList.add('activated');
}
});
span.addEventListener('mouseover', function() {
this.onmousedown = function() {
mouseDown = true
};
document.onmouseup = function() {
mouseDown = false;
};
if (mouseDown) {
if (this.classList.contains('activated')) {
this.classList.remove('activated');
} else {
this.classList.add('activated');
};
};
});
});
#selectbox {
position: relative;
display: block;
width: 4rem;
border: 1px dashed green;
}
.activated {
background: rgba(0, 0, 10, 0.1);
}
#selectbox:hover {
background: powderblue;
}
<tr id="row_1">
<td> row 1</td>
<td id="row_1_col_1">
<center>
<span id="selectbox">
<select style="background-color: #ceedd0;" id="row_1_select_1" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</span>
</center>
</td>
<td id="row_1_col_2">
<center>
<span id="selectbox">
<select style="background-color: #ceedd0;" id="row_1_select_1" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</span>
</center>
</td>
<td id="row_1_col_3">
<center>
<span id="selectbox">
<select style="background-color: #ceedd0;" id="row_1_select_1" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</span>
</center>
</td>
<td id="row_1_col_3">
<center>
<span id="selectbox">
<select style="background-color: #ceedd0;" id="row_1_select_1" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</span>
</center>
</td>
<td id="row_1_col_3">
<center>
<span id="selectbox">
<select style="background-color: #ceedd0;" id="row_1_select_1" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</span>
</center>
</td>
<td id="row_1_col_3">
<center>
<span id="selectbox">
<select style="background-color: #ceedd0;" id="row_1_select_1" name="filter_for">
<option value="1">1</option>
<option value="P">P</option>
<option value="0">-</option>
<option selected="selected" value="0">0</option>
</select>
</span>
</center>
</td>

Stop URL parameters being added on submit of form

Okay, so this may be a stupid question, but I'm attempting to write a simple JavaScript app-thing (please excuse my terminology, I'm new to this) which includes a form, except I'm doing it using only HTML and JS (and CSS), so I'm accessing the values in the form by using document.getElementById.
The thing is the Javascript function is supposed to display something, based on the form values (it's basically a GPA calculator), but the things to display simply flash on the screen, and then disappear when I run the HTML file as is, and don't show up at all when I run it through my actual domain. I feel like the reason for this is that after you submit the form, a bunch of URL parameters get tacked on, thus refreshing the HTML, and deleting the newly added innerHTML.
Here's the code for my form:
<form id="calculator" name="calculator">
<table>
<thead>
<tr>
<td>Class Number</td>
<td>Grade</td>
<td>AP/Non-AP</td>
<td>GPA</td>
</tr>
</thead>
<tbody>
<tr>
<td class="classnumber">Class 1</td>
<td>
<select id="class1GPA" name="class1GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class1AP" name="class1AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class1disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 2</td>
<td>
<select id="class2GPA" name="class2GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class2AP" name="class2AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class2disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 3</td>
<td>
<select id="class3GPA" name="class3GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class3AP" name="class3AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class3disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 4</td>
<td>
<select id="class4GPA" name="class4GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class4AP" name="class4AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class4disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 5</td>
<td>
<select id="class5GPA" name="class5GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class5AP" name="class5AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class5disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 6</td>
<td>
<select id="class6GPA" name="class6GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class6AP" name="class6AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class6disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 7</td>
<td>
<select id="class7GPA" name="class7GPA">
<option value="none">N/A</option>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class7AP" name="class7AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class7disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 8</td>
<td>
<select id="class8GPA" name="class8GPA">
<option value="none">N/A</option>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class8AP" name="class8AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class8disp">
</td>
</tr>
</br>
</tbody>
</table>
<input onClick="showGPA()" id="submit" type="submit" value="Calculate!"/>
</form>
And the Javascript that is supposed to process it (it doesn't actually display an average yet, but that's less important than figuring out why it just flashes/doesn't display):
function showGPA() {
var grades = {};
grades.classesNumber = 6
if (document.getElementById('class1AP').value === "True") {
grades.class1 = parseFloat(document.getElementById('class1GPA').value) + 0.5;
} else {
grades.class1 = parseFloat(document.getElementById('class1GPA').value);
}
document.getElementById('class1disp').innerHTML = grades.class1.toFixed(1);
if (document.getElementById('class2AP').value === "True") {
grades.class2 = parseFloat(document.getElementById('class2GPA').value) + 0.5;
} else {
grades.class2 = parseFloat(document.getElementById('class2GPA').value);
}
document.getElementById('class2disp').innerHTML = grades.class2.toFixed(1);
if (document.getElementById('class3AP').value === "True") {
grades.class3 = parseFloat(document.getElementById('class3GPA').value) + 0.5;
} else {
grades.class3 = parseFloat(document.getElementById('class3GPA').value);
}
document.getElementById('class3disp').innerHTML = grades.class3.toFixed(1);
if (document.getElementById('class4AP').value === "True") {
grades.class4 = parseFloat(document.getElementById('class4GPA').value) + 0.5;
} else {
grades.class4 = parseFloat(document.getElementById('class4GPA').value);
}
document.getElementById('class4disp').innerHTML = grades.class4.toFixed(1);
if (document.getElementById('class5AP').value === "True") {
grades.class5 = parseFloat(document.getElementById('class5GPA').value) + 0.5;
} else {
grades.class5 = parseFloat(document.getElementById('class5GPA').value);
}
document.getElementById('class5disp').innerHTML = grades.class5.toFixed(1);
if (document.getElementById('class6AP').value === "True") {
grades.class6 = parseFloat(document.getElementById('class6GPA').value) + 0.5;
} else {
grades.class6 = parseFloat(document.getElementById('class6GPA').value);
}
document.getElementById('class6disp').innerHTML = grades.class6.toFixed(1);
if (document.getElementById('class7GPA').value !== "none") {
if (document.getElementById('class7AP').value === "True") {
grades.class7 = parseFloat(document.getElementById('class7GPA').value) + 0.5;
} else {
grades.class7 = parseFloat(document.getElementById('class7GPA').value);
}
document.getElementById('class7disp').innerHTML = grades.class7.toFixed(1);
grades.classesNumber++;
} else {
grades.class7 = 0;
}
if (document.getElementById('class8GPA').value !== "none") {
if (document.getElementById('class8AP').value === "True") {
grades.class8 = parseFloat(document.getElementById('class8GPA').value) + 0.5;
} else {
grades.class8 = parseFloat(document.getElementById('class8GPA').value);
}
document.getElementById('class8disp').innerHTML = grades.class8.toFixed(1);
grades.classesNumber++;
} else {
grades.class8 = 0;
}
}
How is it possible for me to stop 16 different URL parameters from being added on when the form submits?
Now my guess as to why it doesn't work may be completely wrong, as I said, I'm new to this. (While trying to make this work, I noticed that one of the problems was that I spelt .innerHTML as .innnerHTML)
But if someone could help me make this work, preferably without learning PHP or something, that would be great. Thanks!

When you submit a form, it will do an HTTP post to the action you specify. If you're looking to run some javascript on your form here, and stop it from posting, add 'return false' on your submit.
http://jsbin.com/icobam/2/edit
<form id="calculator" name="calculator" onsubmit="return false;">

<form id="calculator" name="calculator" onsubmit='showGPA();' method="post">
Inserting method="post" will stop the form from adding parameters in the URL.

Remove the onclick statement from the submit button:
<input onClick="showGPA()" id="submit"
to
<input id="submit"
Change the form to:
<form id="calculator" name="calculator" onsubmit='showGPA(); return false;'>
Note: if there are any javascript errors within the showGPA function then the form will be submitted and cause a page refresh. The only way to prevent this is to ensure that there are no javascript errors.

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