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how to edit all the td's on tbody

so what im trying to do is to add the "change" functionality in my code, it works for only the first td but not any other, when i click the other td it automaticly edits the first one.
does anyone know why my code is only changing the td>name/td> and not the td>adress/td> or any other td>
html:
<form id="registrering">
<label>Navn: <input id="inpnavn" placeholder="Raahim Khan" type="text" required></label>
<label>Adresse: <input id="inpadresse" type="text" placeholder="Adresse 12" required></label>
<label>Mobilnummer: <input id="inpmobilnummer" placeholder="12345678" required></select></label>
<label>Kjønn:
<select id="inpkjønn" required>
<option value="" selected disabled hidden>Velg kjønn</option>
<option>Mann</option>
<option>Kvinne</option>
<option>intetkjønn</option>
</select>
</label>
<button type="submit">Send inn</button>
</form>
//showing the data on website
function hentruss(snapshot){
var pk = snapshot.key;
var nyruss = snapshot.val();
var russref = database.ref("russ/" + nyruss.russ);
russref.on("value", function(snapshotruss){
var russobj = snapshotruss.val();
txttabell.innerHTML += `
<tr id="${pk}">
<td><label class="russlabel" onclick="edit('${pk}')">${nyruss.navn}</label><input type="text" class="editItem" style="display:none"></td>
<td><label class="russlabel" onclick="edit('${pk}')">${nyruss.adresse}</label><input type="text" class="editItem" style="display:none"></td>
<td>${nyruss.mobilnummer}</td>
<td>${nyruss.kjønn}</td>
<td><label class="delete" onclick="slett('${pk}')"><button>Slett</button></label></td>
</tr>
`;
});
}
//update the name,adress etc by clicking the element.
function edit(pk) {
var russen = russ.child(pk);
var label = document.querySelector(`#${pk} .russlabel`);
label.style.display = "none";
var tekst = label.innerText;
var inputfelt = document.querySelector(`#${pk} .editItem`);
inputfelt.style.display = "block";
inputfelt.value = tekst;
inputfelt.focus();
inputfelt.onblur = function() {
inputfelt.style.display = "none";
label.style.display = "block";
};
inputfelt.onchange = function() {
russen.update( {tekst: inputfelt.value} )
inputfelt.style.display = "none";
label.style.display = "block";
label.innerText = inputfelt.value;
};
}

It's a little hard to give an exact solution as the code snippets you have shared have a lot of calls to function whose context is not clear.. I have done my best to illustrate how you can do what you are trying to.. Maybe this will help get started in the right direction:
function handleSubmit(form) {
// Simulate creation of item using a form
var name = form.name.value;
var mobile = form.mobile.value;
// Generate random pk for demonstration
var pk = `pk${+new Date()}`;
var tableBody = document.querySelector('table tbody');
tableBody.innerHTML += ` <tr>
<td>
<label class="russlabel" onclick="edit(this)" data-pk="1" data-field="name">${name}</label>
<input class="editItem" style="display:none;" />
</td>
<td>
<label class="russlabel" onclick="edit(this)" data-pk="1" data-field="mobile">${mobile}</label>
<input class="editItem" style="display:none;" />
</td>
</tr>`;
return false;
}
function edit(label) {
var pk = label.dataset.pk;
var field = label.dataset.field;
var input = label.parentElement.children[1]; // Use label.parent.querySelector('input') if DOM is more complex
label.style = 'display:none;';
input.style = 'disply:block;';
input.focus();
input.value = label.innerHTML;
input.onchange = function() {
// pk and field are available here
// to Update DB state?? not sure how this code works
//var russen = russ.child(pk);
//russen.update( {tekst: inputfelt.value} )
}
input.onblur = function() {
label.innerHTML = input.value;
label.style = 'display:block;';
input.style = 'display:none;';
}
}
td {
padding: 0.5rem 0;
border-bottom: 1px solid black;
}
form {
margin: 1rem auto;
}
<form id="entry" onsubmit="return handleSubmit(this);">
<input name="name" placeholder="Name" />
<input name="mobile" placeholder="mobile" />
<input type="submit" value="Add Entry" />
</form>
<table>
<thead>
<tr>
<th>Name</th>
<th>Mobile</th>
</thead>
<tbody>
<tr>
<td>
<label class="russlabel" onclick="edit(this)" data-pk="1" data-field="name">Tom</label>
<input class="editItem" style="display:none;" />
</td>
<td>
<label class="russlabel" onclick="edit(this)" data-pk="1" data-field="mobile">1234</label>
<input class="editItem" style="display:none;" />
</td>
</tr>
</tbody>
</table>
Some notes:
It may be a good idea to read up on/ brush up on JS Events Here and refactor out the in line event handlers - these make your code hard to maintain, read, reason about, debug and are generally a bad idea.
Same goes for inline styles - avoid them. Try using classes with supporting styles in a stylesheet instead. (For example, on clicking a label, we could add an active class to the td element which in turn automatically hides the label and shows the input.
It's bad practice to reassign listeners to the inputs each time the label is clicked. The same functionality can be handled in a simpler and more graceful manner by using something like Event Delegation

Javascript appendChild(td) works one place, not another

Consider this HTML (part of a table in a form):
<tr id="EnterForRow">
<td>Entered for</td>
<td><input type="radio" name="enterfor" value "0" checked>Myself
<input type="radio" name="enterfor" value "1">Someone Else </td>
</tr>
<tr id="PrayerForRow">
<td>Prayer for </td>
<td> <input type="radio" name="prayerfor" value="0" checked>Myself
<input type="radio" name="prayerfor" value="1">Someone Else </td>
</tr>
When users click Someone Else, I have Javascript to make a new text input box appear on the row. The Javascript for PrayerForRow works but the Javascript for EnterForRow does not work. I can't see any obvious differences. I think I have been staring at it too long..
This works:
var prayforRad = document.getElementsByName('prayerfor');
for(var i = 0; i < prayforRad.length; i++)
{
prayforRad[i].onclick = function()
{
var theValue = radioValue(document.getElementsByName('prayerfor'));
if (theValue == "1")
{
if (!document.getElementById("pfor"))
{
var newTd = document.createElement("td");
newTd.setAttribute("id", "pfor");
var pforRow = document.getElementById("PrayerForRow");
pforRow.appendChild(newTd);
newTd.innerHTML = '<td>For: <input type="text" name="PrayFor" id="PrayFor" size="25"></td>';
}
}
else
{
if (document.getElementById("pfor"))
{
var pforRow = document.getElementById("PrayerForRow");
var pf = document.getElementById("pfor");
pforRow.removeChild(pf);
}
}
}
}
This does not:
var enterforRad = document.getElementsByName('enterfor');
for(var j = 0; j < enterforRad.length; j++)
{
enterforRad[j].onclick = function()
{
var theValue2 = radioValue(document.getElementsByName('enterfor'));
if (theValue2 == "1")
{
if (!document.getElementById("efor"))
{
var newTD2 = document.createElement("td");
newTD2.setAttribute("id", "efor");
var eforRow = document.getElementById("EnterForRow");
eforRow.appendChild(newTD2);
newTD2.innerHTML = '<td>For: <input type="text" name="EntFor" id="EntFor" size="25"></td>';
}
}
else
{
if (document.getElementById("efor"))
{
var eforRow = document.getElementById("EnterForRow");
var ef = document.getElementById("efor");
eforRow.removeChild(ef);
}
}
}
}
Any pointers are appreciated.

<td><input type="radio" name="enterfor" value "0" checked>Myself
<input type="radio" name="enterfor" value "1">Someone Else </td>
i think you have lost two "="

As I suggested in the comment, it is better to hide/display an existing element than creating those optional elements based on the condition like
<tr id="EnterForRow">
<td>Entered for</td>
<td>
<input type="radio" name="enterfor" value="0" checked />Myself
<input type="radio" name="enterfor" value="1" />Someone Else
</td>
<td id="efor" style="display: none">For:
<input type="text" name="EntFor" id="EntFor" size="25" />
</td>
</tr>
<tr id="PrayerForRow">
<td>Prayer for</td>
<td>
<input type="radio" name="prayerfor" value="0" checked />Myself
<input type="radio" name="prayerfor" value="1" />Someone Else
</td>
<td id="pfor" style="display: none">For:
<input type="text" name="PrayFor" id="PrayFor" size="25" />
</td>
</tr>
then
var prayforRad = document.getElementsByName('prayerfor');
for (var i = 0; i < prayforRad.length; i++) {
prayforRad[i].onclick = function () {
var theValue = radioValue(document.getElementsByName('prayerfor'));
var pf = document.getElementById("pfor");
pf.style.display = theValue == '1' ? '' : 'none'
}
}
var enterforRad = document.getElementsByName('enterfor');
for (var j = 0; j < enterforRad.length; j++) {
enterforRad[j].onclick = function () {
var theValue2 = radioValue(document.getElementsByName('enterfor'));
var ef = document.getElementById("efor");
ef.style.display = theValue2 == '1' ? '' : 'none'
}
}
Demo: Fiddle
Also I would recommend using addEventListener() to add the listener instead of using onclick property

implementing quantity to update price of product and total price

i am creating a checkout page where users can purchase goods. i have managed to give each product its price but what I cant do is give them its quantity. i simply do no know how to do it. i created a quantity box for them but i can link the two.
my goal is to update the quantity and total price should be displayed on the checkout form.
since this is my homework for college, this must be done in strictly javascript if a solution arrives.
<script type="text/javascript">
function total(frm) {
var tot = 0;
for (var i = 0; i < frm.elements.length; i++) {
if (frm.elements[i].type == "checkbox") {
if (frm.elements[i].checked) tot += Number(frm.elements[i].value);
}
}
document.getElementById("totalDiv").firstChild.data = "£" + tot;
type = "text/javascript" > total(document.getElementById("theForm"));
}
</script>
<form action="nextpage" method="post" id="theForm">
<fieldset>
<legend>Choose your Products</legend>
<table style="padding:2px">
<tr>
<td>
<img src="http://placehold.it/200x200" />
</td>
<td>
<img src="http://placehold.it/200x200" />
</td>
<td>
<img src="http://placehold.it/200x200" />
</td>
<td>
<img src="http://placehold.it/200x200" />
</td>
</tr>
<tr>
<td class="buttons">
<div>
<input type="checkbox" name="r" value="25" onclick="total(this.form);" />£25</div>
<input min="0" max="5" type="number" class="quantity" name="quantity" value="1" />
</td>
<td class="buttons">
<div>
<input type="checkbox" name="7" value="50" onclick="total(this.form);" />£50</div>
<input min="0" max="5" type="number" class="quantity" name="quantity" value="1" />
</td>
<td class="buttons">
<div>
<input type="checkbox" name="asd7" value="75" onclick="total(this.form);" />£75</div>
<input min="0" max="5" type="number" class="quantity" name="quantity" value="1" />
</td>
<td class="buttons">
<div>
<input type="checkbox" name="rasd7" value="100" onclick="total(this.form);" />£100</div>
<input min="0" max="5" type="number" class="quantity" name="quantity" value="1" />
</td>
</tr>
</table>
<div id="totalDiv">£0</div>
<div>
<input type="submit" value="Place Order" />
</div>
</fieldset>
</form>
http://jsfiddle.net/isherwood/96qkr/

Simple and fast solution
Well the simplest solution would be:
Number(frm.elements[i].value) * Number(frm.elements[i+1].value);
Since the quantity element always comes AFTER the checkbox element.
The JavaScript then becomes:
function total(frm)
{
var tot = 0;
for (var i = 0; i < frm.elements.length; i++) {
if (frm.elements[i].type == "checkbox") {
if (frm.elements[i].checked) tot +=
Number(frm.elements[i].value) * Number(frm.elements[i+1].value);
}
}
document.getElementById("totalDiv").firstChild.data = "£" + tot;
}
You can see this works here.
To guarantee that the total div also gets updated when quantity is changed, you should add the onclick="total(this.form);" event to the class="quantity" input elements as well.
You can see how nicely this works here.
More advanced solution
Personally, I would use tabIndex to group the checkbox and quality inputs.
For example, for the first product:
<td class="buttons">
<div>
<input tabindex="1" name="checkbox" type="checkbox" value="25" onclick="total(this.form);" />£25</div>
<input tabindex="1" name="quantity" min="0" max="5" type="number" class="quantity" value="1" onclick="total(this.form);"/>
</td>
As you can see, I have explicitly defined the tabIndex and names.
Now for the JavaScript, I now use:
function total(frm)
{
var tot = 0;
var checkboxes = document.forms[frm.id].elements["checkbox"];
var quants = document.forms[frm.id].elements["quantity"];
for (var i = 0; i < checkboxes.length; i++)
{
if (checkboxes[i].checked)
{
// if tabIndex correctly specified
if (checkboxes[i].tabIndex == quants[i].tabIndex)
// add to total
tot += Number(checkboxes[i].value) * Number(quants[i].value);
else
// notify of bug
alert('Bug in code: tabIndex of checkbox '+i+' is not the same as tabIndex quantity '+i);
}
}
document.getElementById("totalDiv").firstChild.data = "£" + tot;
}
By doing it this way you get the following advantages:
Your HTML code makes more sense (input elements are grouped per tabIndex)
Your code is checked for bugs
You are absolutely sure that you multiply the correct input elements
You can find this code in this jsFiddle.
Good luck! I hope this helps you out!
Update
To create a sort of checkout system, you could go over all the elements again and store them in a variable.
Then make sure that the form implements a function upon submit:
action="javascript:checkout()"
so in total:
<form action="javascript:checkout()" id="theForm">
Easiest way to create the message would be to use one variable like so:
function checkout()
{
var message = "";
var checkboxes = document.forms["theForm"].elements["checkbox"];
var quants = document.forms["theForm"].elements["quantity"];
for (var i = 0; i < checkboxes.length; i++)
{
if (checkboxes[i].checked)
{
switch(checkboxes[i].tabIndex)
{
case 1: message += "iPhone"; break;
case 2: message += "Screen"; break;
case 3: message += "Laptop"; break;
case 4: message += "Coffee"; break;
default: message += "";
}
message += " Quantity: " + Number(quants[i].value) + " Price: £" + Number(checkboxes[i].value) * Number(quants[i].value) + "\n";
}
}
message += "\nTotal: " + document.getElementById("totalDiv").firstChild.data;
alert(message);
}
You can find a working implementation of this here.
Fancy solution
Or if you would like to make it a little bit more fancy, you could do the following:
Add the following HTML:
HTML
<br><br>
<div id="checkout">
<table id="myTable" border="1">
<tr>
<td>Product</td>
<td>Quantity</td>
<td>Price</td>
</tr>
</table>
</div>
Add the following JavaScript function:
JavaScript
function checkout()
{
document.getElementById("checkout").innerHTML = '<table id="myTable" border="1"><tr><td><b>Product</b></td><td><b>Quantity</b></td><td><b>Price</b></td></tr></table>';
// Find a <table> element with id="myTable":
var table = document.getElementById("myTable");
var count = 0;
var max = 0;
var checkboxes = document.forms["theForm"].elements["checkbox"];
var quants = document.forms["theForm"].elements["quantity"];
for (var i = 0; i < checkboxes.length; i++)
{
if (checkboxes[i].checked)
{
switch(checkboxes[i].tabIndex)
{
case 1: message = "iPhone"; break;
case 2: message = "Screen"; break;
case 3: message = "Laptop"; break;
case 4: message = "Coffee"; break;
}
count += Number(quants[i].value);
max += 1;
// Create an empty <tr> element and add it to the table:
var row = table.insertRow(max);
// Insert new cells (<td> elements) at the 1st, 2nd and 3rd position
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
// Add some text to the new cells:
cell1.innerHTML = message;
cell2.innerHTML = Number(quants[i].value);
cell3.innerHTML = "£" + Number(checkboxes[i].value) * Number(quants[i].value);
}
}
// Calculate total
var row = table.insertRow(max+1);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
cell1.innerHTML = "<b>Total</b>";
cell2.innerHTML = count;
cell3.innerHTML = document.getElementById("totalDiv").firstChild.data;
}
The result looks like this:
You can find the corresponding jsFiddle HERE.
Hope that helps you out!

Autosum with generated fields JS

I'm a bit stuck with javascript again. Basically when you click a button a new row of fields will appear, giving them a new name just a different number.
I now need these fields to be able to auto sum by themself, i can do this with the first row I just don't know how to do them with the new generated ones.
The Javascript code:
<script language="javascript" type="text/javascript">
var i=2;
function addRow()
{
var tbl = document.getElementById('customersAdd');
var lastRow = tbl.rows.length;
var iteration = lastRow - 1;
var row = tbl.insertRow(lastRow);
var firstCell = row.insertCell(0);
var el = document.createElement('input');
el.placeholder = 'Quantity';
el.type = 'text';
el.name = 'quantity' + i;
el.id = 'quantity' + i;
firstCell.appendChild(el);
var secondCell = row.insertCell(1);
var el2 = document.createElement('input');
el2.placeholder = 'Description';
el2.type = 'text';
el2.name = 'description' + i;
el2.id = 'description' + i;
secondCell.appendChild(el2);
var thirdCell = row.insertCell(2);
var el3 = document.createElement('input');
el3.placeholder = 'Rate';
el3.type = 'text';
el3.name = 'rate' + i;
el3.id = 'rate' + i;
thirdCell.appendChild(el3);
var forthCell = row.insertCell(3);
var el4 = document.createElement('input');
el4.placeholder = 'Amount';
el4.type = 'text';
el4.name = 'amount' + i;
el4.id = 'amount' + i;
forthCell.appendChild(el4);
// alert(i);
i++;
// alert(i);
}
function startCalc(){
interval = setInterval("calc()",1);
}
function calc(){
one = document.main.quantity1.value;
two = document.main.rate1.value;
document.main.amount1.value = (one * 1) * (two * 1);
}
function stopCalc(){
clearInterval(interval);
}
</script>
The HTML code:
<form action="submit.php" name="main" method="post">
<table style="border-collapse: collapse;" border="0" align="center" width="50%" class="horiz" id="customersAdd">
<tr>
<td align="center"><br/>
<input class="text" style="width:100%" type="button" align="middle"value="Add Aditional Row" onClick="addRow()" /></td>
</tr>
<tr align="center">
<td>
<br />
<input placeholder="Quantity" type="text" name="quantity1" id="quantity1" onFocus="startCalc();" onBlur="stopCalc();" />
<br /></td>
<td>
<br />
<input placeholder="Description" type="text" name="description1" id="description1"/>
<br /></td>
<td>
<br />
<input placeholder="Rate" type="text" name="rate1" id="rate1" onFocus="startCalc();" onBlur="stopCalc();"/>
<br /></td>
<td>
<br />
<input placeholder="Amount" type="text" name="amount1" id="amount1" onBlur="stopCalc();" onFocus="startCalc();" readonly="true" />
<br /></td>
</tr>
</table></form>
To make things easier for anyone who could help me I have made this in JSBin to see it easier of what i want to do. Any suggestions are appreciated.
http://jsbin.com/atabaz/1/edit
Thanks

In the end I managed to find a way on how to do this myself, if anyone is interested take a look at this:
http://jsfiddle.net/2sYgE/
var currentItem = 1;
$('#customersAdd').on('keyup', '.quantity, .rate, .amount', calculateRow);
$('#addnew').click(function() {
currentItem++;
$('#customersAdd').append('<tr><td><input placeholder="Quantity" type="text" name="quantity' + currentItem +'" id="quantity' + currentItem +'" class="qty form-input-rate" /></td><td><input placeholder="Description" type="text" name="description' + currentItem +'" id="description' + currentItem +'" class="form-input-rate"/></td><td><input placeholder="Rate" type="text" name="rate' + currentItem +'" id="rate' + currentItem +'" class="rate form-input-rate"/></td><td><input placeholder="Amount" type="text" name="amount' + currentItem +'" id="amount' + currentItem +'" class="cal form-input-rate"/></td></tr>'
);
});
function calculateSum() {
var sum = 0;
$(".cal").each(function () {
if (!isNaN(this.value) && this.value.length != 0) {
sum += parseFloat(this.value);
}
});
}
function calculateRow() {
var cost = 0;
var $row = $(this).closest("tr");
var qty = parseFloat($row.find('.qty').val());
// changed the following line to only look within the current row
var rate = parseFloat($row.find('.rate').val());
cost = qty * rate;
if (isNaN(cost)) {
$row.find('.cal').val("0");
} else {
$row.find('.cal').val(cost);
}
calculateSum();
}

Polling for changes is a very inefficient and error–prone way to do form updates. Listening for change events is a better way to go as it uses fewer resources and waits until the user has finished updating the control before doing anything. There is also an input event that can be used, but it's not suitable here as it will update the form as the user enters values. Much better to wait for the user to finish entering values, then do the update.
I've re–factored your code below, it's not ready for production but it should give you some idea of how to go about it. Table rows are cloned as it's much faster than creating all the elements from scratch. Then names are modified, though this isn't really necessary. There is no need for ID attributes.
Cloning only works reliably here if inline listeners are used on the form controls. If the initial listeners are dynamically attached, you'll have to add them each time a row is added as listeners added using addEventListener are not cloned.
I haven't included any input validation, if the user puts in junk, they get junk back. You should validate input to check that appropriate values are being entered, and also format the displayed values for presentation.
<script type="text/javascript">
function addRow(element) {
var form = element.form;
var table = form.getElementsByTagName('table')[0];
var tbody = table.tBodies[0];
var num = tbody.rows.length - 1;
var row = table.rows[1].cloneNode(true);
var input, inputs = row.getElementsByTagName('input')
// Update input names
for (var i=0, iLen=inputs.length; i<iLen; i++) {
input = inputs[i];
input.name = input.name.replace(/\d+$/,num);
input.value = '';
}
tbody.insertBefore(row, tbody.rows[tbody.rows.length - 1]);
}
function updateRow(element) {
var form = element.form;
var num = element.name.replace(/^\D+/,'');
var value = form['quantity' + num].value * form['rate' + num].value;
form['amount' + num].value = (value == 0)? '' : value;
updateTotal(form);
}
function updateTotal(form) {
var elements = form.elements;
var name = /^amount/;
var total = 0;
var value;
for (var i=0, iLen=elements.length; i<iLen; i++) {
if (name.test(elements[i].name)) {
total += parseFloat(elements[i].value);
}
}
form.total.value = total;
}
</script>
<form action="submit.php" name="main" method="post">
<table style="border-collapse: collapse;" border="0" align="center"
width="50%" class="horiz" id="customersAdd">
<tr>
<td><br>
<input class="text" style="width:100%" type="button"
align="middle"value="Add Aditional Row" onclick="addRow(this)">
</td>
</tr>
<tr>
<td>
<input placeholder="Quantity" name="quantity1" onblur="updateRow(this);">
</td>
<td>
<input placeholder="Description" type="text" name="description1">
</td>
<td>
<input placeholder="Rate" name="rate1" onchange="updateRow(this);">
</td>
<td>
<input placeholder="Amount" name="amount1" readonly>
</td>
</tr>
<tr>
<td colspan="3" style="text-align: right">Total
<td><input name="total" readonly>
</tr>
</table>
<input type="reset">
</form>

JavaScript Renaming Form Image Input Name

I am developing this for use in Internet Explorer 8 (because at work we have to use it). I have a page that has a table withing a form. The table has a button to "clone" rows, "AddScheduleRow()". That part works good. Each row has a button to delete that row "DeleteRow(r)". That part works well too. I also have a script to rename/renumber each row, "RenumberRows()". It almost works good. I can rename the text fields (for example what was previously StartDate3 now becomes StartDate2). However, in each row is an input that is type="image" and it is named like you should with any input. The name of it is "StartDateCal". The problem is that during the renaming process, when it hits the image input (TheForm.StartDateCal[i].name = "StartDateCal" + TempCounter;), I get a JavaScript error "'TheForm.StartDateCal' is null or not an object". I cannot figure this one out and it's standing in the way of moving on.
What can I do to try to rename an < input type = image /> ?
Below is the necessary code:
HTML
<html>
<head>
</head>
<body>
<form name="UpdateSchedule" method="post" action="DoSchedule.asp">
<input type="hidden" name="NumRows" value="0">
<input type="hidden" name="RowsAdded" value="0">
<table id="ClassScheduleTable">
<tr id="ScheduleRow" style="display:none;">
<td>
<input type="text" name="RowNum" value="0" size="1" onclick="alert(this.name)">
</td>
<td>
<b>Start Date</b> <input type="text" name="StartDate" value="" onclick="alert(this.name);" size="8">
<input type="image" name="StartDateCal" src="http://www.CumminsNorthwest.com/ATT/Img/Calendar3.png" style="border-style:none;" onClick="alert('name = ' + this.name);return false;">
</td>
<td>
<input type="button" value="Del." name="DelRow" class="subbuttonb" onclick="DeleteRow(this);">
</td>
</tr>
<tr>
<td colspan="3" style="text-align:right">
<input type="button" value="Add Class Date" class="SubButton" onclick="AddScheduleRow();">
</td>
</tr>
</table>
</form>
</body>
<script language="JavaScript">
JS
var TheForm = document.forms.UpdateSchedule;
var NumRows =0;
var RowsAdded =0;
function AddScheduleRow(){
NumRows++;
TheForm.NumRows.value = NumRows;
RowsAdded++;
TheForm.RowsAdded.value = RowsAdded;
var TableRowId = "ScheduleRow";
var RowToClone = document.getElementById(TableRowId);
var NewTableRow = RowToClone.cloneNode(true);
NewTableRow.id = TableRowId + NumRows ;
NewTableRow.style.display = "table-row";
var NewField = NewTableRow.children;
for (var i=0;i<NewField.length;i++){
var TheInputFields = NewField[i].children;
for (var x=0;x<TheInputFields.length;x++){
var InputName = TheInputFields[x].name;
if (InputName){
TheInputFields[x].name = InputName + NumRows;
//alert(TheInputFields[x].name);
}
var InputId = TheInputFields[x].id;
if (InputId){
TheInputFields[x].id = InputId + NumRows;
//alert(TheInputFields[x].id);
}
}
}
var insertHere = document.getElementById(TableRowId);
insertHere.parentNode.insertBefore(NewTableRow,insertHere);
RenumberRows();
}
AddScheduleRow();
function DeleteRow(r){
var i=r.parentNode.parentNode.rowIndex;
document.getElementById("ClassScheduleTable").deleteRow(i);
NumRows--;
TheForm.NumRows.value = NumRows;
RenumberRows();
}
function RenumberRows(){
var TempCounter = 0;
for (var i=0;i<=RowsAdded;i++){
if (TheForm.RowNum[i]){
TempCounter++;
TheForm.RowNum[i].name = "RowNum" + TempCounter;
TheForm.RowNum[i].value = TempCounter;
TheForm.StartDate[i].name = "StartDate" + TempCounter;
TheForm.StartDateCal[i].name = "StartDateCal" + TempCounter;
}
}
}
</script>
</html>

might be to do with your DTD,
try HTML4 Strict:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

You can use
document.getElementsByName('StartDateCal')[i].name = "StartDateCal" + TempCounter;
instead of
TheForm.StartDateCal[i].name = "StartDateCal" + TempCounter;