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Continue loop through all tbody element and add id to all tr's

I have many tables and I want to give all tr's individual ids. I loop through all tbody but it only affects first tbody, not all of them. When I add loop indicating each tbody they work. Is there any efficient way available to loop through all tbody and give the tr's individual id. I want to do it using vanilla javascript, no jQuery.
My sample code here :
<table><tbody>
<tr><td>No.</td><td>Name</td><td>Score</td></tr>
<tr><td>01</td><td>ted</td><td>0.50</td></tr>
<tr><td>02</td><td>joe</td><td>0.25</td></tr>
</tbody></table>
<table><tbody>
<tr><td>Name</td><td>Address</td><td>Phone</td></tr>
<tr><td>joe</td><td>LA</td><td>012345</td></tr>
<tr><td>ted</td><td>NY</td><td>0124</td></tr>
</tbody></table>
<table><tbody>
<tr><td>Name</td><td>Spec</td><td>Budget</td></tr>
<tr><td>joe</td><td>i5</td><td>458</td></tr>
<tr><td>ted</td><td>i7</td><td>768</td></tr>
</tbody></table>
Javascript :
var c = document.getElementsByTagName('tbody');
var _trIndex = 1;
for ( i=0; i<c.length; i++) {
var x = c[i].rows;
for (i=0; i<x.length; i++){
x[i].setAttribute('id','tr'+_trIndex++)
}
}
Second Try :
var c = document.getElementsByTagName('tbody');
var _trIndex = 1;
for ( i=0; i<c.length; i++) {
var x = c[0].rows;
for (i=0; i<x.length; i++){
x[i].setAttribute('id','tr'+_trIndex++)
}
var y = c[1].rows;
for (i=0; i<y.length; i++){
y[i].setAttribute('id','tr'+_trIndex++)
}
}

Probably this is what you need:
// Instead of getting the table bodies, I get only the table
// rows inside the tbody elements.
var c = document.querySelectorAll('tbody tr');
// Here I check if definitely the above query found any values.
if ( c ) {
// Then I do the itteration to the found tr elements
for ( i = 0; i < c.length; i++) {
// And here I set the ID the same way you did in your example
c[i].setAttribute('id','tr'+i);
}
}
<table>
<tbody>
<tr><td>No.</td><td>Name</td><td>Score</td></tr>
<tr><td>01</td><td>ted</td><td>0.50</td></tr>
<tr><td>02</td><td>joe</td><td>0.25</td></tr>
</tbody>
</table>
<table>
<tbody>
<tr><td>Name</td><td>Address</td><td>Phone</td></tr>
<tr><td>joe</td><td>LA</td><td>012345</td></tr>
<tr><td>ted</td><td>NY</td><td>0124</td></tr>
</tbody>
</table>
<table>
<tbody>
<tr><td>Name</td><td>Spec</td><td>Budget</td></tr>
<tr><td>joe</td><td>i5</td><td>458</td></tr>
<tr><td>ted</td><td>i7</td><td>768</td></tr>
</tbody>
</table>

You can achieve this with a single line of javascript.
document.querySelectorAll("tbody tr").forEach((element, index) => element.setAttribute("id", "tr" + index));
<table>
<thead>
<tr>
<td>No.</td>
<td>Name</td>
<td>Score</td>
</tr>
</thead>
<tbody>
<tr>
<td>No.</td>
<td>Name</td>
<td>Score</td>
</tr>
<tr>
<td>01</td>
<td>ted</td>
<td>0.50</td>
</tr>
<tr>
<td>02</td>
<td>joe</td>
<td>0.25</td>
</tr>
</tbody>
</table>
<table>
<tbody>
<tr>
<td>Name</td>
<td>Address</td>
<td>Phone</td>
</tr>
<tr>
<td>joe</td>
<td>LA</td>
<td>012345</td>
</tr>
<tr>
<td>ted</td>
<td>NY</td>
<td>0124</td>
</tr>
</tbody>
</table>
<table>
<tbody>
<tr>
<td>Name</td>
<td>Spec</td>
<td>Budget</td>
</tr>
<tr>
<td>joe</td>
<td>i5</td>
<td>458</td>
</tr>
<tr>
<td>ted</td>
<td>i7</td>
<td>768</td>
</tr>
</tbody>
</table>

Hide empty html table rows

Problem
I have a table with one or more empty rows. How to hide empty rows from the table?
For example
1 - John | Alfredo
2 - Mark | Zuck
3 - |
4 - Carl | Johnson
In this case, I'd like to delete the third row.
Step Tried
I found how to delete a specific row, what about deleting all the empty rows?
deleteEmptyRows();
function deleteEmptyRows() {
var myTable = document.getElementById("myTable")
var rowToDelete = 2;
myTable.deleteRow(rowToDelete)
}
<table border="1" cellspacing="1" cellpadding="1" id ="myTable">
<tbody>
<tr>
<td>John</td>
<td>Alfredo</td>
</tr>
<tr>
<td>Mark</td>
<td>Zuck</td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
<tr>
<td>Carl</td>
<td>Johnson</td>
</tr>
</tbody>
</table>

This is how you can dynamically hide empty table rows with javascript.
deleteEmptyRows();
function checkIfCellsAreEmpty(row) {
var cells = row.cells;
var isCellEmpty = false;
for(var j = 0; j < cells.length; j++) {
if(cells[j].innerHTML !== '') {
return isCellEmpty;
}
}
return !isCellEmpty;
}
function deleteEmptyRows() {
var myTable = document.getElementById("myTable");
for(var i = 0; i < myTable.rows.length; i++) {
var isRowEmpty = checkIfCellsAreEmpty(myTable.rows[i]);
if (isRowEmpty) {
myTable.rows[i].style.display = "none";
}
}
}
<table border="1" cellspacing="1" cellpadding="1" id ="myTable">
<tbody>
<tr>
<td>John</td>
<td>Alfredo</td>
</tr>
<tr>
<td>Mark</td>
<td>Zuck</td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
<tr>
<td>Carl</td>
<td>Johnson</td>
</tr>
</tbody>
</table>

Here, a simple method for row is empty (this allows us to check for other conditions easily later).
Loop over rows and call remove if empty.
const rowIsEmpty = (tr) => Array.from(tr.querySelectorAll('td')).every(td => td.innerText === "");
deleteEmptyRows();
function deleteEmptyRows() {
var myTable = document.getElementById("myTable");
myTable.querySelectorAll('tr').forEach(tr => {
if(rowIsEmpty(tr)) tr.remove();
});
}
<table border="1" cellspacing="1" cellpadding="1" id ="myTable">
<tbody>
<tr>
<td>John</td>
<td>Alfredo</td>
</tr>
<tr>
<td>Mark</td>
<td>Zuck</td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
<tr>
<td>Carl</td>
<td>Johnson</td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
</tbody>
</table>

Was answered in another thread.
Jquery: hiding empty table rows
Loops through all table tr rows, and checks td lengths. If the td length is empty will hide.
$("table tr").each(function() {
let cell = $.trim($(this).find('td').text());
if (cell.length == 0){
console.log('Empty cell');
$(this).addClass('nodisplay');
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<tr>
<td>1</td>
</tr>
<tr>
<!-- Will hide --> <td></td>
</tr>
</table>

With native Javascript:
function removeRow(src) {
var tableRows = document.getElementById(src).querySelectorAll('tr');
tableRows.forEach(function(row){
if((/^\s*$/).test(row.innerText)){
row.parentNode.removeChild(row);
}
});
}
removeRow('myTable');
The only problem is when you have some other characters in the row, except the whitespaces. This regex checks for blank characters, but if u have a dot inside or any other non empty character, it will fail.

Sort rows based in ascending order using jQuery

This code works but checks only the first column. I want to check the 2nd column instead with the points. How do I alter it?
HTML Table:
<table width="100%">
<thead>
<tr>
<th width="60%">Name</th>
<th width="20%">School</th>
<th width="20%">Points</th>
</tr>
</thead>
<tbody>
<tr>
<td rowspan="4"><h1>Event 1</h1></td>
<td>School1</td>
<td>74</td>
</tr>
<tr>
<td>School2</td>
<td>69</td>
</tr>
<tr>
<td>School3</td>
<td>71</td>
</tr>
<tr>
<td>School4</td>
<td>11</td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td rowspan="4"><h1>Event 2</h1></td>
<td>School1</td>
<td>34</td>
</tr>
<tr>
<td>School5</td>
<td>29</td>
</tr>
<tr>
<td>School3</td>
<td>62</td>
</tr>
<tr>
<td>School7</td>
<td>15</td>
</tr>
</tbody>
</table>
jQuery:
var $tbody = $('#caltbl tbody');
$tbody.find('tr').sort(function (a, b) {
var tda = $(a).find('td:eq(0)').text();
var tdb = $(b).find('td:eq(0)').text();
// if a < b return 1
return tda > tdb ? 1
// else if a > b return -1
: tda < tdb ? -1
// else they are equal - return 0
: 0;
}).appendTo($tbody);
How do I got about this?
JSFIDDLE
EDIT: I'm sorry guys but my live code is different with rowspan being used. Is there a possibility to have this in ascending order so that the events are sorted differently?

eq(0) means you are using the first index. Change it to eq(1) so that it can consider the second index.
var tda = $(a).find('td:eq(1)').text();
var tdb = $(b).find('td:eq(1)').text();

You can sort the trs. Detach the td and insert to an array. Then append them back to each row
Add some class to simplify coding.
JSFIDDLE
HTML
<table width="100%">
<thead>
<tr>
<th width="60%">Name</th>
<th width="20%">School</th>
<th width="20%">Points</th>
</tr>
</thead>
<tbody>
<tr class="event1">
<td rowspan="4"><h1>Event 1</h1></td>
<td>School1</td>
<td class="point">74</td>
</tr>
<tr class="event1">
<td>School2</td>
<td class="point">69</td>
</tr>
<tr class="event1">
<td>School3</td>
<td class="point">71</td>
</tr>
<tr class="event1">
<td>School4</td>
<td class="point">11</td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td rowspan="4"><h1>Event 2</h1></td>
<td>School1</td>
<td>34</td>
</tr>
<tr>
<td>School5</td>
<td>29</td>
</tr>
<tr>
<td>School3</td>
<td>62</td>
</tr>
<tr>
<td>School7</td>
<td>15</td>
</tr>
</tbody>
</table>
JavaScript
var $tbody = $(' tbody');
var array = [];
$tbody.find('.event1').sort(function (a, b) {
var tda = $(a).find('.point').text();
var tdb = $(b).find('.point').text();
return tda - tdb;
}).each(function (idx, tr) {
array.push($(tr).children('td').not('[rowspan]').detach());
});
$.each(array, function (idx, obj) {
$(obj).appendTo($('.event1:eq(' + idx + ')'));
});
The JavaScript only applies to event1. You can simply modify it for arbitrary events.
Change the index as Mayank Pandey said. And..
Since your second column is number, you can just return their difference.
var $tbody = $('#caltbl tbody');
$tbody.find('tr').sort(function (a, b) {
var tda = parseInt($(a).find('td:eq(1)').text(), 10); // always use the base number
var tdb = parseInt($(b).find('td:eq(1)').text(), 10);
return tda - tdb;
}).appendTo($tbody);

Sum table values based on grouping

I have the following table:
<table>
<tr>
<th>Category</th>
<th>Value</th>
</tr>
<tr>
<td class="cat1">cat1</td>
<td class="value">123</td>
</tr>
<tr>
<td class="cat2">cat2</td>
<td class="value">356</td>
</tr>
<tr>
<td class="cat1">cat1</td>
<td class="value">486</td>
</tr>
</table>
I need a way to add/sum all values grouped by category, ie: add/sum all values in cat1, then add/sum all values in cat2. For each group I will do something with the total.
So I was hoping for something like:
for each unique category:
sum values in category
do something with this category total
For cat1 the total would be 123 + 486. Cat2 would just be 356. And so on if there were more categories.
I would prefer a purely javascript solution, but JQuery will do if that's not possible.

If I understand you correctly, you do a repeat of each td:first-child (The category cell).
Create a total object. You can check if the category is exist in it for each cell. If so, add current value to the stored value. If not, insert new property to it.
Like this:
var total = {};
[].forEach.call(document.querySelectorAll('td:first-child'), function(td) {
var cat = td.getAttribute('class'),
val = parseInt(td.nextElementSibling.innerHTML);
if (total[cat]) {
total[cat] += val;
}
else {
total[cat] = val;
}
});
console.log(total);
<table>
<tr>
<th>Category</th>
<th>Value</th>
</tr>
<tr>
<td class="cat1">cat1</td>
<td class="value">123</td>
</tr>
<tr>
<td class="cat2">cat2</td>
<td class="value">356</td>
</tr>
<tr>
<td class="cat1">cat1</td>
<td class="value">486</td>
</tr>
</table>

Here's a simple approach using only javascript
//grab data
var allTR = document.getElementsByTagName('TR');
var result = {};
//cycle table rows
for(var i=0;i<allTR.length;i+2){
//read class and value object data
var class = allTR[i].getAttribute('class');
var value = allTR[i+1].innerText;
//check if exists and add, or just add
if(result[class])
result[class] += parseInt(value);
else
result[class] = parseInt(value);
}

You have to use getElementsByTagName("td"); to get all the <td> collection and then you need to loop through them to fetch their innerText property which later can be summed up to get the summation.
Here is the working Fiddle : https://jsfiddle.net/ftordw4L/1/
HTML
<table id="tbl1">
<tr>
<th>Category</th>
<th>Value</th>
</tr>
<tr>
<td class="cat1">cat1</td>
<td class="value">123</td>
</tr>
<tr>
<td class="cat2">cat2</td>
<td class="value">356</td>
</tr>
<tr>
<td class="cat1">cat1</td>
<td class="value">486</td>
</tr>
<tr>
<td class="total"><b>Total</b></td>
<td class="totalValue"></td>
</tr>
</table>
Javascript
var tds=document.getElementsByTagName("td");
var total=0;
for (var i = 0; i<tds.length; i++) {
if (tds[i].className == "value") {
if(total==0) {
total = parseInt(tds[i].innerText);
} else {
total = total + parseInt(tds[i].innerText);
}
}
}
document.getElementsByClassName('totalValue')[0].innerHTML = total;
Hope this helps!.

here is a solution with jQuery :) if you are interested. it's pretty straightforward
var sumCat1 = 0;
var sumCat2 = 0;
$(".cat1 + .value").each(function(){
sumCat1 += parseInt($(this).text());
})
$(".cat2 + .value").each(function(){
sumCat2 += parseInt($(this).text());
})
console.log(sumCat1)
console.log(sumCat2)
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
<tr>
<th>Category</th>
<th>Value</th>
</tr>
<tr>
<td class="cat1">cat1</td>
<td class="value">123</td>
</tr>
<tr>
<td class="cat2">cat2</td>
<td class="value">356</td>
</tr>
<tr>
<td class="cat1">cat1</td>
<td class="value">486</td>
</tr>
</table>

A simple approach in JQuery...
var obj = {};
$('tr').each(function() {
$this = $(this)
if ($this.length) {
var cat = $(this).find("td").first().html();
var val = $(this).find("td").last().html();
if (cat) {
if (!obj[cat]) {
obj[cat] = parseInt(val);
} else {
obj[cat] += parseInt(val);
}
}
}
})
console.log(obj)

How To Sum All Table Rows td (TotalPrice) using td id Jquery

I am adding values to table like:
Item,Quantity,Price,TotalPrice
Now there are multiple rows: How can i sum TotalPrice of all to get GrandTotal using Jquery.
Code:
$("#Product").append(" <tr><td id='clientname'>" +ClientName+ "</td> <td id='item'>"+ItemName+"</td> <td id='quantity'>"+Quantity+"</td> <td id='price'>"+Price+"</td> <td id='totalprice'>"+TotalPrice+"</td> <td> <a onClick='deleteRow(this);'>Delete</a> </td> </tr>");
Its possible when i insert new row data its show grand total in textbox/label,Like:
function TotalPriceCalc()
{
var lblTotalPrice = document.getElementById('lblTotalPrice');
lblTotalPrice.value = sum;
}

Here's an example that will sum whatever column index you provide.
$(function() {
$("#subtotal").html(sumColumn(4));
$("#total").html(sumColumn(5));
});
function sumColumn(index) {
var total = 0;
$("td:nth-child(" + index + ")").each(function() {
total += parseInt($(this).text(), 10) || 0;
});
return total;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<table style="border-spacing: 10px;">
<tr>
<td>ClientName</td>
<td>ItemName</td>
<td>Quantity</td>
<td>12</td>
<td>34</td>
</tr>
<tr>
<td>ClientName</td>
<td>ItemName</td>
<td>Quantity</td>
<td>56</td>
<td>78</td>
</tr>
<tr>
<td>ClientName</td>
<td>ItemName</td>
<td>Quantity</td>
<td>90</td>
<td>12</td>
</tr>
<tr>
<td colspan="3">Totals</td>
<td id="subtotal"></td>
<td id="total"></td>
</tr>
</table>

After you use class= instead of id= .Cause ID MUST be unique. you need to loop through each row and find totalPrice
$(document).ready(function(){
var TotalValue = 0;
$("#Product tr").each(function(){
TotalValue += parseFloat($(this).find('.totalprice').text());
});
alert(TotalValue);
});
While you tagged Jquery .. This is a Jquery solution so please be sure to include Jquery

You should use classes, not IDs, to name repeated elements. So it should be:
...<td class="totalprice">'+TotalPrice+'</td>...
Then you can do
function TotalPriceCalc() {
var total = 0;
$(".totalprice").each(function() {
total += parseFloat($(this).text());
});
$("#lblTotalPrice").val(total);
}

Have look, this is our table
<table class="table table-bordered">
<thead>
<tr>
<th>1</th>
<th>Price</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td id="loop">50</td>
</tr>
<tr>
<td>1</td>
<td id="loop">60</td>
</tr>
<tr>
<td>1</td>
<td id="loop">70</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="text-right">Total</td>
<td></td>
</tr>
</tbody>
And this is loop to have sum of price
$(function() {
var TotalValue = 0;
$("tr #loop").each(function(index,value){
currentRow = parseFloat($(this).text());
TotalValue += currentRow
});
console.log(TotalValue);
});