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Get prepend() dynamically

I have a table generated in a backend. My task is to wrap text in each header column and add it to each body column cells by using .html() and .prepend(). It works as expected (you will see text in green).
Problem: Tables are generated in a backend, sometimes a table has 3 columns, sometimes 4 columns or more! How to write my Jquery dynamically in order to work on each table.
Please give me a hand. Thanks!
$(document).ready(function() {
var firstHead = $("table thead tr th:first-child").html();
var firstBodyCode = $("<span></span>").text(firstHead);
$('table tbody tr td:first-child').prepend(firstBodyCode);
var secondHead = $("table thead tr th:nth-child(2)").html();
var secondBodyCode = $("<span></span>").text(secondHead);
$('table tbody tr td:nth-child(2)').prepend(secondBodyCode);
});
table {
width: 100%;
border: 1px solid gray
}
span {
color: green
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<thead>
<tr>
<th>Month</th>
<th>Savings</th>
</tr>
</thead>
<tbody>
<tr>
<td>January</td>
<td>$100</td>
</tr>
<tr>
<td>February</td>
<td>$80</td>
</tr>
</tbody>
<tfoot>
<tr>
<td>Sum</td>
<td>$180</td>
</tr>
</tfoot>
</table>

Use a loop to iterate over all the columns.
$(document).ready(function() {
$("table thead tr th").each(function(i) {
let bodyCode = $("<span>", {
text: $(this).text()
});
$(`table tbody tr td:nth-child(${i+1})`).prepend(bodyCode);
});
});
table {
width: 100%;
border: 1px solid gray
}
span {
color: green
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<thead>
<tr>
<th>Month</th>
<th>Savings</th>
</tr>
</thead>
<tbody>
<tr>
<td>January</td>
<td>$100</td>
</tr>
<tr>
<td>February</td>
<td>$80</td>
</tr>
</tbody>
<tfoot>
<tr>
<td>Sum</td>
<td>$180</td>
</tr>
</tfoot>
</table>

Would like to know how to filter results from a specific (nested, table within table) table heading?

Have been dabbling around with this piece of code, only I could do with some input. Could really do with a follow up working examples altered code snippet if at all possible. Need to figure the filter/search - returning results being limited to a specified table heading ('th/tr' - tags), namely the Title heading and search within ONLY this area, though displaying the whole cells still (Title, Description and Date).Any questions I'll be pleased to help.
var input, table, rows, noMatches, markInstance;
$(document).ready(function init() {
input = document.getElementById('myInput');
noMatches = document.getElementById('noMatches');
table = document.getElementById('myTable');
rows = table.querySelectorAll('tr');
markInstance = new Mark(table);
input.addEventListener('keyup', _.debounce(ContactsearchFX, 250));
});
function ContactsearchFX() {
resetContent();
markInstance.unmark({
done: highlightMatches
});
}
function resetContent() {
$('.noMatchErrorText').remove();
//Remove this line to have a log of searches
//noMatches.textContent = '';
rows.forEach(function(row) {
$(row).removeClass('show');
});
}
function highlightMatches() {
markInstance.mark(input.value, {
each: showRow,
noMatch: onNoMatches,
})
}
function showRow(element) {
//alert(element);
$(element).parents('tr').addClass('show');
$(element).parents('tr').siblings('tr').addClass('show');
//Parents incase of several nestings
}
function onNoMatches(text) {
$('#myInput').after('<p class="noMatchErrorText">No records match: "' + text + '"</p>');
}
.input-wrap {
margin-bottom: 12px;
}
#myInput:invalid~.hints {
display: block;
}
#noMatches:empty,
#noMatches:empty+.hints {
display: none;
}
.style1 tr {
display: none;
}
.style1 .show {
display: table-row;
}
mark {
background: orange;
font-weight: bold;
color: black;
}
.style1 {
text-align: left;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/lodash#4.17.11/lodash.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mark.js/8.11.1/mark.min.js"></script>
<div class="input-wrap">
<label>
Search Titles:
<input id="myInput" type="text" required
placeholder="Search Titles" />
</label>
</div>
<div class="hintsWrap">
<p id="noMatches"></p>
<p class="hints">
Hints: type "Title1", "Title2", "Title3"...
</p>
</div>
<br />
<br />
<table id="myTable" style="width: 100%" class="style1">
<tr>
<td>
<br />
<br />
<br />
<table style="width: 100%">
<tr>
<th class="style1">Title</th>
<td>title1</td>
</tr>
<tr>
<th class="style1">Description</th>
<td>description1</td>
</tr>
<tr>
<th class="style1">Date</th>
<td>date1</td>
</tr>
</table>
<br />
<table style="width: 100%">
<tr>
<th class="style1">Title</th>
<td>title2</td>
</tr>
<tr>
<th class="style1">Description</th>
<td>description2</td>
</tr>
<tr>
<th class="style1">Date</th>
<td>date2</td>
</tr>
</table>
<br />
<br />
<table style="width: 100%">
<tr>
<th class="style1">Title</th>
<td>title3</td>
</tr>
<tr>
<th class="style1" style="height: 23px">Description</th>
<td style="height: 23px">description3</td>
</tr>
<tr>
<th class="style1">Date</th>
<td>date3</td>
</tr>
</table>
<br />
<br />
<table style="width: 100%">
<tr>
<td>
<table style="width: 100%">
<tr>
<th class="style1">Title</th>
<td>title4</td>
</tr>
<tr>
<th class="style1">Description</th>
<td>description4</td>
</tr>
<tr>
<th class="style1">Date</th>
<td>date4</td>
</tr>
</table>
</td>
</tr>
</table>
<br />
</td>
</tr>
</table>

As continuation from comments above, and since this was something basic that you would like to use, i posted it here.
I added some notes on the code but the essences are:
This is just a really basic approach without any use of libraries.
I play with classes in order to hide the table rows and also to mark the result
Although i leave the part on the script that display: none; the lines of the table, you can manipulate the CSS and delete it from the code.
function myFunction() {
var input, filter, table, tr, td, i, txtValue;
input = document.getElementById("myInput");
filter = input.value.toUpperCase();
table = document.getElementById("myTable");
tr = table.querySelectorAll("tbody > tr");
for (i = 0; i < tr.length; i++) { // Loop through all table rows, and hide those who don't match the search query
td = tr[i].getElementsByTagName("td")[0]; // this will search on the Title col. You can change this to search on other cols.
if (td) {
txtValue = td.textContent || td.innerText;
if (txtValue.toUpperCase().indexOf(filter) > -1) { // found
tr[i].style.display = "";
tr[i].classList.add("mark"); // mark result
}
else { // didn't found
tr[i].style.display = "none";
tr[i].classList.remove("mark"); // unmark result
}
}
if (input.value === '') { // case the input is clear
tr[i].classList.remove("mark"); // unmark result
tr[i].style.display = "none";
}
}
}
table {position: relative; min-width: 320px;} /* */
tbody tr {opacity: 0;} /* this will hide the table's info + will show the result under the headers */
tr.mark {opacity: 1;} /* this will show the result row */
/* basic style (markers) to the result row - just for demonstration purpose */
tr.mark td {background: yellow;} /* (second) col */
tr.mark td:first-child {background: blue;} /* first col */
tr.mark td:last-child {background: orange;} /* third col*/
<input type="text" id="myInput" onkeyup="myFunction()" placeholder="Search Titles..">
<table id="myTable">
<thead>
<tr>
<th>Title</th>
<th>Description</th>
<th>Date</th>
</tr>
</thead>
<tbody>
<tr>
<td>bla bla bla</td>
<td>description1</td>
<td>date1</td>
</tr>
<tr>
<td>yada yada yada</td>
<td>description2</td>
<td>date2</td>
</tr>
<tr>
<td>Another Title</td>
<td>description3</td>
<td>date3</td>
</tr>
</tbody>
</table>
Hope that it is what you searched for, and Enjoy code!

Solution 1. you can play with css selectors to achieve your goal:
#myTable table tr:first-child td mark {
background: orange;
font-weight: bold;
color: black;
}
mark {
background: initial;
}
Solution 2. edit your init function for sibling only titles like this:
$(document).ready(function init() {
input = document.getElementById('myInput');
noMatches = document.getElementById('noMatches');
/************************************************
NOTE :: your last table element doesn't match your template
************************************************/
table = document.querySelectorAll('#myTable table tr:first-child td');
rows = document.querySelectorAll('#myTable table tr');
markInstance = new Mark(table);
input.addEventListener('keyup', _.debounce(ContactsearchFX, 250));
});
Have fun

Make entire column disappear

How can I make the left column in a table disappear using plain JS?
This is my approach:
<table id="tab" border="1">
<tr>
<td>abc</td>
<td>def</td>
</tr>
<tr>
<td>ghi</td>
<td>jkl</td>
</tr>
<tr>
<td>mno</td>
<td>pqr</td>
</tr>
</table>
<button onclick="inv()">invisible</button>
<button onclick="vis()">visible</button>
<script>
var tab, td;
window.onload = function() {
tab = document.getElementById("tab");
td = tab.getElementsByTagName("td");
}
function inv() {
for (i = 0; i < td.length; i++) {
td[i].style.display = "none";
i++;
}
}
function vis() {
for (i = 0; i < td.length; i++) {
td[i].style.display = "block";
i++;
}
}
</script>
It works, but I have to use "ugly" loops.
Maybe there is a more efficient way by just saying column[0].display = "none".
Here is the fiddle.

Take advantage of CSS hierarchy and nth-child selectors.
Use selector tr td:nth-child(1) to select all the first column td elements.
JSfiddle
var tab;
// Use DOMContentLoaded instead of load event
document.addEventListener('DOMContentLoaded', function() {
tab = document.getElementById('tab');
});
function inv() {
tab.classList.add('hide');
}
function vis() {
tab.classList.remove('hide');
}
.hide tr td:nth-child(1) {
display: none;
}
<table id="tab" border="1">
<tr>
<td>abc</td>
<td>def</td>
</tr>
<tr>
<td>ghi</td>
<td>jkl</td>
</tr>
<tr>
<td>mno</td>
<td>pqr</td>
</tr>
</table>
<button onclick="inv()">invisible</button>
<button onclick="vis()">visible</button>
Demo using toggle with single button.
function toggle() {
document.getElementById('tab').classList.toggle('hide');
}
.hide tr td:nth-child(1) {
display: none;
}
<table id="tab" border="1">
<tr>
<td>abc</td>
<td>def</td>
</tr>
<tr>
<td>ghi</td>
<td>jkl</td>
</tr>
<tr>
<td>mno</td>
<td>pqr</td>
</tr>
</table>
<button onclick="toggle()">Toggle</button>

By the use of some empty css classes and jQuery, you are able to achieve that in a one-liner:
<table id="tab" border="1">
<tr>
<td class="col1">abc</td>
<td class="col2">def</td>
</tr>
<tr>
<td class="col1">ghi</td>
<td class="col2">jkl</td>
</tr>
<tr >
<td class="col1">mno</td>
<td class="col2">pqr</td>
</tr>
</table>
now you can just do:
jQuery(".col1").hide();
(mind the selector with a dot before the class name)

The most efficient solution would be to inject and remove a stylesheet and let the browser do the work.
Fiddle: https://jsfiddle.net/4L4h7ea1/2/
var tab, td;
var hideFirstColumnCss = document.createElement('style');
hideFirstColumnCss.setAttribute('id', 'hideCssStyle');
hideFirstColumnCss.innerHTML = '#tab td:first-child { display: none; }';
window.onload = function () {
tab = document.getElementById("tab");
td = tab.getElementsByTagName("td");
}
function inv() {
document.head.appendChild(hideFirstColumnCss);
}
function vis() {
var style = document.getElementById('hideCssStyle');
style.parentNode.removeChild(style);
}

Use the row tags to get to your cells to hide/show them. That way you can specify an index for the row as all cells are direct children of their row.
var tab, td;
window.onload = function () {
tab = document.getElementById("tab");
tr = tab.getElementsByTagName("tr");
}
function inv() {
for (i = 0; i < td.length; i++) {
tr[i].children[0].style.display = "none";
}
}
function vis() {
for (i = 0; i < td.length; i++) {
tr[i].children[0].style.display = "block";
}
}

How do I create the empty table data boxes with JavaScript?

I want to be able to create the html table like this without using any html and only writing JavaScript.
How do I create the empty table data boxes with JavaScript?
table {
border: 1px solid black;
}
th {
border: 1px solid blue;
}
td {
border: 1px solid red;
}
<!DOCTYPE html>
<html>
<head></head>
<body>
<table>
<tr>
<th>One</th>
<th>Two</th>
<th>Three</th>
</tr>
<tr>
<th>A</th>
<td></td>
<td></td>
</tr>
<tr>
<th>B</th>
<td></td>
<td></td>
</tr>
<tr>
<th>C</th>
<td></td>
<td></td>
</tr>
</table>
</body>
<html>

Try this:
var myTableRows = [
[{"th":"One"},{"th":"Two"},{"th":"Three"}],
[{"th":"A"},{"td":""},{"td":""}],
[{"th":"B"},{"td":""},{"td":""}],
[{"th":"C"},{"td":""},{"td":""}]
];
var table = document.createElement("table");
for(var rowIndex in myTableRows) {
var row = document.createElement("tr");
for(var colIndex in myTableRows[rowIndex]) {
for(var tag in myTableRows[rowIndex][colIndex]) {
var cell = document.createElement(tag);
var cellContents = document.createTextNode(myTableRows[rowIndex][colIndex][tag]);
cell.appendChild(cellContents);
row.appendChild(cell);
}
}
table.appendChild(row);
}
document.body.appendChild(table);

Auto-number table rows?

I have the following HTML table:
<table border="1">
<tr>
<td>blue</td>
</tr>
<tr>
<td>red</td>
</tr>
<tr>
<td>black</td>
</tr>
</table>
I would like each row in this table have a number automatically assigned to each item.
How could he do?

The following CSS enumerates table rows (demo):
table {
counter-reset: rowNumber;
}
table tr::before {
display: table-cell;
counter-increment: rowNumber;
content: counter(rowNumber) ".";
padding-right: 0.3em;
text-align: right;
}
<table cellpadding="0">
<tr><td>blue</td></tr>
<tr><td>red</td></tr>
<tr><td>yellow</td></tr>
<tr><td>green</td></tr>
<tr><td>purple</td></tr>
<tr><td>orange</td></tr>
<tr><td>maroon</td></tr>
<tr><td>mauve</td></tr>
<tr><td>lavender</td></tr>
<tr><td>pink</td></tr>
<tr><td>brown</td></tr>
</table>
If the CSS cannot be used, try the following JavaScript code (demo):
var table = document.getElementsByTagName('table')[0],
rows = table.getElementsByTagName('tr'),
text = 'textContent' in document ? 'textContent' : 'innerText';
for (var i = 0, len = rows.length; i < len; i++) {
rows[i].children[0][text] = i + ': ' + rows[i].children[0][text];
}
<table border="1">
<tr>
<td>blue</td>
</tr>
<tr>
<td>red</td>
</tr>
<tr>
<td>black</td>
</tr>
</table>

And if you would use headers as well the following is the thing you need:
http://jsfiddle.net/davidThomas/7RyGX/
table {
counter-reset: rowNumber;
}
table tr:not(:first-child) {
counter-increment: rowNumber;
}
table tr td:first-child::before {
content: counter(rowNumber);
min-width: 1em;
margin-right: 0.5em;
}
note the: ":not(:first-child)" in there.

Here is a modification of David Thomas' CSS solution that works with or without a header row in the table. It increments the counter on the first td cell of each row (thereby skipping the row with only th cells):
table
{
counter-reset: rowNumber;
}
table tr > td:first-child
{
counter-increment: rowNumber;
}
table tr td:first-child::before
{
content: counter(rowNumber);
min-width: 1em;
margin-right: 0.5em;
}
You can see the behavior in this jsfiddle.

Here's a javascript solution that will add a cell at the beginning of each row , this cell will be used for numbering, if there is a th cell this gets a colspan=2 attribute.
var addNumeration = function(cl){
var table = document.querySelector('table.' + cl)
var trs = table.querySelectorAll('tr')
var counter = 1
Array.prototype.forEach.call(trs, function(x,i){
var firstChild = x.children[0]
if (firstChild.tagName === 'TD') {
var cell = document.createElement('td')
cell.textContent = counter ++
x.insertBefore(cell,firstChild)
} else {
firstChild.setAttribute('colspan',2)
}
})
}
addNumeration("test")
<table class="test" border="1">
<tr>
<th>hi!</th>
</tr>
<tr>
<td>blue</td>
</tr>
<tr>
<td>red</td>
</tr>
<tr>
<td>black</td>
</tr>
</table>