Develop Reference

loop over table to set the background css

My HTML table has some classes and table tag is used
Want to retain the classes as is, but all my table and tr , th or td are using td bgcolor which is an old technique.
I want to loop over the table and find if that bgcolor is defined, use the same color and convert it to a css based background color so i can print it in IE
function setBackground() {
var table = document.getElementById("table1");
//i found this in a previous stack overflow answer and tried it
for (var i = 0, row; row = table.rows[i]; i++) {
for (var j = 0, col; col = row.cells[j]; j++) {
//this is for debugging purposes... I can't even get this to work
alert(table.rows[i].cells[j]);
table.rows[i].cells[j].style.background = "orange"; //just an example
}
}
}
because IE is not able to print the background lines and colors for some reason using the webkit property

I cleaned up the for loops a little. You can read the attribute with getAttribute and set the style.
var table = document.getElementById("table1");
for (var i = 0; i < table.rows.length; i++) {
var row = table.rows[i]
for (var j = 0; j < row.cells.length; j++) {
var cell = row.cells[j]
var bgc = cell.getAttribute('bgcolor')
if (bgc) {
cell.style.background = bgc
}
}
}
td {
width: 30px; height: 30px;
}
<table id="table1">
<tr>
<td bgcolor="red"></td>
<td></td>
<td bgcolor="blue"></td>
</tr>
<tr>
<td></td>
<td bgcolor="green"></td>
<td></td>
</tr>
<tr>
<td bgcolor="yellow"></td>
<td></td>
<td></td>
</tr>
<tr>
<td bgcolor="silver"></td>
<td></td>
<td></td>
</tr>
</table>
You can just do it with one loop with getElementsByTagName
var tds = document.getElementById("table1").getElementsByTagName("td");
for (var i = 0; i < tds.length; i++) {
var cell = tds[i]
var bgc = cell.getAttribute('bgcolor')
if (bgc) {
cell.style.background = bgc
}
}
td {
width: 30px; height: 30px;
}
<table id="table1">
<tr>
<td bgcolor="red"></td>
<td></td>
<td bgcolor="blue"></td>
</tr>
<tr>
<td></td>
<td bgcolor="green"></td>
<td></td>
</tr>
<tr>
<td bgcolor="yellow"></td>
<td></td>
<td></td>
</tr>
<tr>
<td bgcolor="silver"></td>
<td></td>
<td></td>
</tr>
</table>

Get the color if found and then do with it whatever needed...
function setBackgroundColor(colorValue) {
const table = document.getElementById("table1");
const rows = table.children[0].rows
for (let i = 0; i < rows.length; i++) {
const tds = rows[i].children;
for (let j = 0; j < tds.length; j++) {
if (tds[j].bgColor === colorValue) {
console.log('Color found, do action')
}
}
}
}
setBackgroundColor('red')
<table id="table1">
<tr>
<th>Month</th>
<th>Savings</th>
</tr>
<tr>
<td bgcolor="red">January</td>
<td bgcolor="green">$100</td>
</tr>
</table>

You can do this:
var cells = $("#targetTable td");
for(i in cells){
color = $(cells[i]).attr('bgcolor');
console.log(color);
$(cells[i]).css({background: color});
}

as Taplar mentioned in the comment :
Use document.querySelectorAll('td[bgcolor]') to get the td that have bgcolor, loop through them and set the background to that color :
document.querySelectorAll('td[bgcolor]').forEach(e => {
const bgColor = e.getAttribute('bgcolor');
e.removeAttribute('bgcolor'); // optional, if you want to remove the attribute
e.style.background = bgColor;
})
<table id="table1">
<thead>
<th>A</th>
<th>B</th>
<th>C</th>
</thead>
<tbody>
<tr>
<td bgcolor="red">1</td>
<td>2</td>
<td>3</td>
</tr>
<tr>
<td>4</td>
<td bgcolor="green">5</td>
<td>6</td>
</tr>
<tr>
<td>7</td>
<td>8</td>
<td bgcolor="blue">9</td>
</tr>
</tbody>
</table>

How do I sum the price column from HTML table using JavaScript?

I am trying to add Price from table column to a total.
I am having problem adding values such as 10.00 or 5.99. I am able to calculate prices with int values, but not with values 10.00 or 5.99, etc.
Here is what I have below.
var table = document.getElementById("myTable"),
sumVal = 0;
for (var i = 1; i < table.rows.length; i++) {
sumVal = sumVal + parseF(table.rows[i].cells[2].innerHTML);
}
document.getElementById("val").innerHTML = "SubTotal =" + sumVal;
console.log(sumVal);
<table id="myTable">
<tr>
<th>Item</th>
<th>Price</th>
<th>Remove</th>
</tr>
<tr>
<td>Hoddie</td>
<td class="count-me">15.00</td>
<td><button onClick="myFunction()">Remove</button></td>
</tr>
<tr>
<td>Nike Cap</td>
<td class="count-me">10.99</td>
<td><button onClick="myFunction()">Remove</button></td>
</tr>
</table>
<span id="val"></span>

You have three issues:
You are grabbing the wrong cell index, indices start at 0:
table.rows[i].cells[1]
You need to call the correct parse function:
parseFloat(table.rows[i].cells[1].innerHTML);
You need to format your output:
"SubTotal = $" + sumVal.toFixed(2);
Update: Added functionality for removing rows.
updateSubTotal(); // Initial call
function updateSubTotal() {
var table = document.getElementById("myTable");
let subTotal = Array.from(table.rows).slice(1).reduce((total, row) => {
return total + parseFloat(row.cells[1].innerHTML);
}, 0);
document.getElementById("val").innerHTML = "SubTotal = $" + subTotal.toFixed(2);
}
function onClickRemove(deleteButton) {
let row = deleteButton.parentElement.parentElement;
row.parentNode.removeChild(row);
updateSubTotal(); // Call after delete
}
#myTable td {
padding: 0.25em;
}
#val {
display: block;
margin-top: 0.5em;
}
<table id="myTable">
<tr>
<th>Item</th>
<th>Price</th>
<th>Remove</th>
</tr>
<tr>
<td>Hoodie</td>
<td class="count-me">15.00</td>
<td><button onClick="onClickRemove(this)">Remove</button></td>
</tr>
<tr>
<td>Nike Cap</td>
<td class="count-me">10.99</td>
<td><button onClick="onClickRemove(this)">Remove</button></td>
</tr>
</table>
<span id="val"></span>

You are accessing the incorrect array element and also need to use parseFloat
The cells array is zero-based so you need to use cells[1] to access the second column:
var table = document.getElementById("myTable"),
sumVal = 0;
for (var i = 1; i < table.rows.length; i++) {
sumVal = sumVal + parseFloat(table.rows[i].cells[1].innerHTML);
}
document.getElementById("val").innerHTML = "SubTotal =" + sumVal;
console.log(sumVal);
<table id="myTable">
<tr>
<th>Item</th>
<th>Price</th>
<th>Remove</th>
</tr>
<tr>
<td>Hoddie</td>
<td class="count-me">15.00</td>
<td><button onClick="myFunction()">Remove</button></td>
</tr>
<tr>
<td>Nike Cap</td>
<td class="count-me">10.99</td>
<td><button onClick="myFunction()">Remove</button></td>
</tr>
</table>
<span id="val"></span>

updateSubTotal(); // Initial call
function updateSubTotal() {
var table = document.getElementById("myTable");
let subTotal = Array.from(table.rows).slice(1).reduce((total, row) => {
return total + parseFloat(row.cells[1].innerHTML);
}, 0);
let subTotal2 = Array.from(table.rows).slice(1).reduce((total, row) => {
return total + parseFloat(row.cells[2].innerHTML);
}, 0);
document.getElementById("val").innerHTML = "SubTotal = $" + subTotal.toFixed(2);
document.getElementById("val1").innerHTML = subTotal2.toFixed(2);
}
function onClickRemove(deleteButton) {
let row = deleteButton.parentElement.parentElement;
row.parentNode.removeChild(row);
updateSubTotal(); // Call after delete
}
#myTable td {
padding: 0.25em;
}
#val {
display: block;
margin-top: 0.5em;
}
<table id="myTable">
<tr>
<th>Item</th>
<th>Price</th>
<th>M2</th>
<th>Remove</th>
</tr>
<tr>
<td>Hoodie</td>
<td class="count-me">15.00</td>
<td class="count-me">34.00</th>
<td><button onClick="onClickRemove(this)">Remove</button></td>
</tr>
<tr>
<td>Nike Cap</td>
<td class="count-me">10.99</td>
<td class="count-me">22.34</th>
<td><button onClick="onClickRemove(this)">Remove</button></td>
</tr>
</table>
<span id="val"></span>
<span id="val1"></span>

var cell = document.getElementsByClassName("count-me");
var val = 0;
var i = 0;
while (cell[i] != undefined) {
val += parseFloat(cell[i].innerHTML);
i++;
} //end while
document.getElementById("val").innerHTML = parseFloat(val).toFixed(2);
console.log(parseFloat(val).toFixed(2));
<table id="myTable">
<tr>
<th>Item</th>
<th>Price</th>
<th>Remove</th>
</tr>
<tr id="">
<td>Hoddie</td>
<td class="count-me">15.00</td>
<td>
<button onClick="myFunction()">Remove</button>
</td>
</tr>
<tr>
<td>Nike Cap</td>
<td class="count-me">10.99</td>
<td>
<button onClick="myFunction()">Remove</button>
</td>
</tr>
</table>
<span id="val"></span>

JS - Compare first row to other rows in table

I'm a completely newbie and looking for help.
Given the following table:
<table id="table">
<thead>
# FIRST ROW
<tr>
<th>Apple</th>
<th>Pizza</th>
<th>Eggs</th>
</tr>
<tbody>
# SECOND ROW
<tr>
<td>Apple</td> --> should end with 'success' class
<td>Juice</td>
<td>Lettuce</td>
<td>Oranges</td>
<td>Eggs</td> --> should end with 'success' class
</tr>
# THIRD ROW
<tr>
<td>Pizza</td> --> should end with 'success' class
<td>Chicken</td>
</tr>
</tbody>
</table>
I would like to add class 'success' to every td in SECOND and THIRD rows whenever it matches any td in FIRST row (and only in FIRST ROW).
For now I came up with adding <td> values of first row to array and I'm not sure what steps should I take next (filter? for loop and '===' comparison?):
function myFunction() {
var tHeadersValues = [];
var tHeaders = document.getElementById("table").rows[0].cells;
for (var i = 0; i < tHeaders.length; i++) {
tHeadersValues.push(tHeaders[i].textContent);
}
return tHeadersValues;
}

Object.keys(tHeaders).map(key => tHeaders[key].textContent) transforms the td objects to an array with the containing text. The rest is straight forward:
function toValues(tHeaders) {
return Object.keys(tHeaders).map(function(key){
return tHeaders[key].textContent;
});
}
function myFunction() {
var rows = document.getElementById("results-table").rows;
var tHeadersValues = toValues(rows[0].cells);
for (var i = 1; i < rows.length; i++) {
var rowCells = rows[i].cells;
var values = toValues(rowCells);
for(var j=0;j<values.length;j++) {
if(values[j].length > 0 && tHeadersValues.indexOf(values[j]) > -1) {
rowCells[j].className = "success";
}
}
}
}
myFunction();
<style>
.success {
background-color: green;
}
</style>
<table id="results-table">
<thead>
<tr>
<th>Apple</th>
<th>Pizza</th>
<th>Eggs</th>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Apple</td>
<td>Juice</td>
<td>Lettuce</td>
<td>Oranges</td>
<td>Eggs</td>
</tr>
<tr>
<td>Pizza</td>
<td>Chicken</td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>

function myFunc(){
var tds = document.getElementsByTagName("td");
var hds = document.getElementsByTagName("th");
for(var i=0; i<tds.length; i++) {
var tdContent = tds[i].innerHTML;
if(tdContent.length > 0){
for(var j = 0; j<hds.length; j++) {
if(tdContent === hds[j].innerHTML) {
document.getElementsByTagName("td")[i].className = "success";
}
}
}
}
}
myFunc();
<style>
.success {
background-color: green;
}
</style>
<table id="results-table">
<thead>
<tr>
<th>Apple</th>
<th>Pizza</th>
<th>Eggs</th>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Apple</td>
<td>Juice</td>
<td>Lettuce</td>
<td>Oranges</td>
<td>Eggs</td>
</tr>
<tr>
<td>Pizza</td>
<td>Chicken</td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>

get count of second td for each tr in my code

Excuse me (I cant write good English!), i want to get sum of count product for each category and append to category column.
how i can get sum of count of product for each tr and append to current tr in this CODE?
$(function() {
function groupTable($rows, startIndex, total) {
if (total === 0) {
return;
}
var i, currentIndex = startIndex,
count = 1,
lst = [];
var tds = $rows.find('td:eq(' + currentIndex + ')');
var ctrl = $(tds[0]);
lst.push($rows[0]);
for (i = 1; i <= tds.length; i++) {
if (ctrl.text() == $(tds[i]).text()) {
count++;
$(tds[i]).addClass('deleted');
lst.push($rows[i]);
} else {
if (count > 1) {
ctrl.attr('rowspan', count);
groupTable($(lst), startIndex + 1, total - 1)
}
count = 1;
lst = [];
ctrl = $(tds[i]);
lst.push($rows[i]);
}
}
}
groupTable($('#myTable tr:has(td)'), 0, 3);
$('#myTable .deleted').remove();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>
<table id="myTable" border="1" cellpadding="3" cellspacing="0">
<tr>
<th>Category</th>
<th>Product</th>
</tr>
<tr>
<td>Category-1</td>
<td>Product-1</td>
</tr>
<tr>
<td>Category-1</td>
<td>Product-1</td>
</tr>
<tr>
<td>Category-1</td>
<td>Product-2</td>
</tr>
<tr>
<td>Category-1</td>
<td>Product-2</td>
</tr>
<tr>
<td>Category-2</td>
<td>Product-3</td>
</tr>
<tr>
<td>Category-2</td>
<td>Product-3</td>
</tr>
<tr>
<td>Category-2</td>
<td>Product-3</td>
</tr>
<tr>
<td>Category-2</td>
<td>Product-4</td>
</tr>
<tr>
<td>Category-3</td>
<td>Product-5</td>
</tr>
<tr>
<td>Category-3</td>
<td>Product-5</td>
</tr>
<tr>
<td>Category-3</td>
<td>Product-5</td>
</tr>
<tr>
<td>Category-4</td>
<td>Product-6</td>
</tr>
<tr>
<td>Category-4</td>
<td>Product-6</td>
</tr>
</table>

Sorting pairs of rows with tablesorter

http://jsfiddle.net/9sKwJ/66/
tr.spacer { height: 40px; }
$.tablesorter.addWidget({
id: 'spacer',
format: function(table) {
var c = table.config,
$t = $(table),
$r = $t.find('tbody').find('tr'),
i, l, last, col, rows, spacers = [];
if (c.sortList && c.sortList[0]) {
$t.find('tr.spacer').removeClass('spacer');
col = c.sortList[0][0]; // first sorted column
rows = table.config.cache.normalized;
last = rows[0][col]; // text from first row
l = rows.length;
for (i=0; i < l; i++) {
// if text from row doesn't match last row,
// save it to add a spacer
if (rows[i][col] !== last) {
spacers.push(i-1);
last = rows[i][col];
}
}
// add spacer class to the appropriate rows
for (i=0; i<spacers.length; i++){
$r.eq(spacers[i]).addClass('spacer');
}
}
}
});
$('table').tablesorter({
widgets : ['spacer']
});
<table id="test">
<thead>
<tr>
<th>Name</th>
<th>Number</th>
<th>Another Example</th>
</tr>
</thead>
<tbody>
<tr>
<td>Test4</td>
<td>4</td>
<td>Hello4</td>
</tr>
<tr>
<td colspan="3">Test4</td>
</tr>
<tr>
<td>Test3</td>
<td>3</td>
<td>Hello3</td>
</tr>
<tr>
<td colspan="3">Test3</td>
</tr>
<tr>
<td>Test2</td>
<td>2</td>
<td>Hello2</td>
</tr>
<tr>
<td colspan="3">Test2</td>
</tr>
<tr>
<td>Test1</td>
<td>1</td>
<td>Hello1</td>
</tr>
<tr>
<td colspan="3">Test1</td>
</tr>
</tbody>
</table>
This sorts just the way I want it if you sort it by the first column, but the other two columns don't maintain the same paired 'tr' sort im looking for.
Any help on this?

Use the expand-child class name on each duplicated row:
<tr>
<td>Test3</td>
<td>3</td>
<td>Hello3</td>
</tr>
<tr class="expand-child">
<td colspan="3">Test3</td>
</tr>
It's defined by the cssChildRow option:
$('table').tablesorter({
cssChildRow: "expand-child"
});​
Here is a demo of it in action.