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Automatic multiplication for several row

I'm new on coding, then any help will greatly appreciated.
I'm trying to make automatic multiplication from 2 value. Basically my table looks like this. Multiplication works perfectly on the first row. If I make another row by simply copying this code:
<tr>
<td><input id="box1" type="text" oninput="calculate()" /></td>
<td><input id="box2" type="text" oninput="calculate()" /></td>
<td><input id="result" /></td>
</tr>
then the second row won't work. This may happen because the id on second row exactly same with the first row. But if I change the id, the script won't work either. Would you please show me how to fix it?
EDIT: I use this scrip for multiplication purpose:
function calculate() {
var myBox1 = document.getElementById('box1').value;
var myBox2 = document.getElementById('box2').value;
var result = document.getElementById('result');
var myResult = myBox1 * myBox2;
result.value = myResult;
}

I would bind a single input event handler to the table, which will catch any input events on any of the table cells' input elements. Within the handler event.target will refer to the input element where the event originated, and you can use DOM navigation properties/methods to find the associated table cells in the same row.
Maybe a little something like this, using class instead of id:
document.getElementById("multiplier").addEventListener("input", function(e) {
var row = e.target.parentNode.parentNode
var val1 = row.querySelector(".valOne").value
var val2 = row.querySelector(".valTwo").value
row.querySelector(".result").value = val1 * val2
})
<table id="multiplier">
<tr>
<td><input class="valOne" type="text" /></td>
<td><input class="valTwo" type="text" /></td>
<td><input class="result" /></td>
</tr>
<tr>
<td><input class="valOne" type="text" /></td>
<td><input class="valTwo" type="text" /></td>
<td><input class="result" /></td>
</tr>
<tr>
<td><input class="valOne" type="text" /></td>
<td><input class="valTwo" type="text" /></td>
<td><input class="result" /></td>
</tr>
</table>
Further reading:
.addEventListener() method
.parentNode property
.querySelector() method
It would be better to use e.target.closest("tr") instead of e.target.parentNode.parentNode, but note that the .closest() method isn't supported in IE so you would need to use a polyfill.
Note that the JS that I've shown would need to be in a script element that is after the table (e.g., at the end of the body right before the closing </body> tag), or you'd need to wrap it in a document load or DOMContentLoaded handler.

jquery / javascript to sum field only if checkbox on same row is checked

I have a jquery / javascript function that totals the number of cubes in my order. this works 100% and is below.
function calculateTotalVolume() {
var grandTotalCubes = 0;
$("table.authors-list").find('input[name^="cubicvolume"]').each(function () {
grandTotalCubes += +$(this).val();
});
$("#grandtotalcubes").text(grandTotalCubes.toFixed(2));
}
as mentioned the above works great. I need a second function to total the same field but only if an checkbox named treated is checked. each row has the checkbox named treated but as the table is dynamically generated, a counter is appended to the name each time hence my use of name^="treated"
I am after something like below but this doesn't work:
function calculateTotalTreatedVolume() {
var grandTotaltreatedCubes = 0;
$("table.authors-list").find('input[name^="cubicvolume"]').each(function () {
if($("table.authors-list").find('checkbox[name^="treated"]').checked){
alert('10');
grandTotaltreatedCubes += +$(this).val();
}
});
$("#grandtotaltreatedcubes").text(grandTotaltreatedCubes.toFixed(2));
}
help appreciated as always.
UPDATE
Rendered HTML output [1 dynamic row added]: (Still in development so very rough, please excuse it)
<table class="authors-list" border=1>
<thead>
<tr>
<td></td><td>Product</td><td>Price/Cube</td><td>Qty</td><td>line total cost</td><td>Discount</td><td>Cubes per bundle</td><td>pcs per bundle</td><td>cubic vol</td><td>Bundles</td><td><input type="checkbox" class="checkall"> Treated</td>
</tr>
</thead>
<tbody>
<tr>
<td><a class="deleteRow"> <img src="http://devryan.tekwani.co.za/application/assets/images/delete2.png" /></a></td>
<td><input type="text" id="product" name="product" />
<input type="hidden" id="price" name="price" readonly="readonly"/></td>
<td><input type="text" id="adjustedprice" name="adjustedprice" /></td>
<td><input type="text" id="qty" name="qty" /></td>
<td><input type="text" id="linetotal" name="linetotal" readonly="readonly"/></td>
<td><input type="text" id="discount" name="discount" /></td>
<td>
<input type="text" id="cubesperbundle" name="cubesperbundle" >
</td>
<td>
<input type="text" id="pcsperbundle" name="pcsperbundle" >
</td>
<td>
<input type="text" id="cubicvolume" name="cubicvolume" size='5' disabled>
</td>
<td><input type="text" id="totalbundles" name="totalbundles" size='5' disabled ></td>
<td valign="top" ><input type="checkbox" id="treated" name="treated" ></td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan="15"><input type="button" id="addrow" value="Add Product" /></td>
</tr>
<tr>
<td colspan="3">Grand Total: R<span id="grandtotal"></span></td>
<td colspan="2">Ave Discount: <span id="avediscount"></span>%</td>
<td colspan="1">Total Cubes: <span id="grandtotalcubes"></span></td>
<td colspan="15">Treated Cubes: <span id="grandtotaltreatedcubes"></span></td>
</tr>
<tr>
<td colspan="15"><textarea rows="1" cols="50" placeholder="Specific Comments"></textarea><textarea rows="1" cols="20" placeholder="Customer Reference"></textarea>
</td>
</tr>
</tfoot>
</table>

First go the parent tr and then using find to find the checkbox in current row and also use checked with DOM object not jQuery object, you can use indexer to convert jQuery object to DOM object.
Change
if($("table.authors-list").find('checkbox[name^="treated"]').checked){
To
if($(this).closest('tr').find('checkbox[name^="treated"]')[0].checked){

checked is a property of the actual DOM element, and what you have is a jQuery element. You need to change this:
$("table.authors-list").find('checkbox[name^="treated"]').checked
To this:
$("table.authors-list").find('checkbox[name^="treated"]')[0].checked
-^- // get DOM element
Or more jQuery-ish:
$("table.authors-list").find('checkbox[name^="treated"]').is(':checked')

You can iterate through the "checked" checkboxes using $("table.authors-list").find('checkbox[name^="treated"]:checked') and use the value of the input nearest to it (assumed to be in the same row).
Assuming your table has many rows each having a checkbox and an input, you can use:
function calculateTotalTreatedVolume() {
var grandTotaltreatedCubes = 0;
// iterate through the "checked" checkboxes
$("table.authors-list").find('input[type="checkbox"][name^="treated"]:checked').each(function () {
// use the value of the input in the same row
grandTotaltreatedCubes += +$(this).closest('tr').find('input[name^="cubicvolume"]').val();
});
$("#grandtotaltreatedcubes").text(grandTotaltreatedCubes.toFixed(2));
}

Try this:
var grandTotaltreatedCubes = 0;
// Cache the table object here for faster processing of your code..
var $table = $("table.authors-list");
$table.find('input[name^="cubicvolume"]').each(function () {
// Check if checkbox is checked or not here using is(':checked')
if ($table.find('checkbox[name^="treated"]').is(':checked')) {
grandTotaltreatedCubes += $(this).val();
}
});
$("#grandtotaltreatedcubes").text(grandTotaltreatedCubes.toFixed(2));

Change the following line
if($("table.authors-list").find('input[name^="treated"]').checked){
To this
if($("table.authors-list").find('input[name^="treated"]').is(':checked')){

How to add row in html table on top of specific row?

I have a table, and each row has a button to add a new row on top of it. Each row has new inputs.
I know how to add a row on top of the table, but not on top of each row that I'm clicking on the button. Would anyone have a tip on how to solve it? I might be able to do it, but the solution I see is very complicated, and I'm sure there must be a smarter solution.
Oh, also I don't know how to update the parameter sent in the insertNewRow(id) function.
So far this is what I have:
<script type="text/javascript">
function insertNewRow(id){
var row = document.getElementById("bottomRow");
var newrow = row.cloneNode(true);
console.log(newrow);
var newInputs = newrow.getElementsByTagName('input');
var allRows = row.parentNode.getElementsByTagName('tr');
row.parentNode.insertBefore(newrow, row);
var i=row.rowIndex;
console.log(i);
}
</script>
<table id="myTable">
<tr>
<td>Title1:</td>
<td></td>
<td>Title2:</td>
<td></td>
<td>Title3:</td>
<td></td>
<td></td>
</tr>
<tr>
<td><input class="c1" readonly maxlength="9" size="7" id="gTop" type="text" value ="11"></td>
<td> <-></td>
<td id="l1"><input class="c2" style="width:35px;" maxlength="9" size="7" type="text" id="lTop" value="33"></td>
<td>=</td>
<td id="rv1"><input id="rvTop" input class="c2" style="width:105px;" maxlength="100" size="37" type="text" value="blahblahblah"></td>
<td></td>
<td>x</td>
</tr>
<tr id="bottomRow">
<td><input class="c1" readonly maxlength="9" size="7" id="gBottom" type="text" value =""></td>
<td> </td>
<td id="l1"><input class="c2" style="width:35px;" maxlength="9" size="7" type="text" id="lBottom" value="11"></td>
<td>=</td>
<td id="rv1"><input id="rvBottom" input class="c2" style="width:105px;" maxlength="100" size="37" type="text" value="blahblahblah"></td>
<td><button type="button" onclick="insertNewRow(1)">+</button></td>
<td>x</td>
</tr>
</table>

In the onclick attribute, instead of just calling insertNewRow(), do something like
insertNewRow.apply(this);
The this keyword inside the onclick attribute is a reference of the clicked element. With insertNewRow.apply(this), we'll be calling insertNewRow() and at the same time, assign the this keyword inside that function call to the clicked element or in this case, the button (if we don't do that, this inside insertNewRow() will be a reference to the Window object instead). Then in, your insertNewRow() function, check if the current element being clicked on is a tr element. If not, go up by one level and see if that element is a tr element. Keep doing that until you get to the first tr element. So, basically you'll be searching for the closest tr element.
<button type="button" onclick="insertNewRow.apply(this);">+</button>
function insertNewRow(){
var row = null,
el = this;
// Get the closest tr element
while (row === null)
{
if (el.tagName.toLowerCase() === 'tr')
{
row = el; // row is now the closest tr element
break;
}
el = el.parentNode;
}
// Rest of the code here
}​
JsFiddle
If you're still not sure what Function.apply() is, take a look at the documentation here.

JavaScript: how to access the textbox in the second row of the table

I have an html code like this -
<table border="0" cellspacing="2" cellpadding="2" width="99%" id="subAccTable">
<tr>
<h2>Sub Accounts</h2>
</tr>
<tr>
<th>action </th>
<th>account</th>
<th>homeDir</th>
<th>primaryGroup</th>
</tr>
<tr>
<td><input type="hidden" name="vtierId" value="" /></td>
<td><input type="text" name="subAcc"
value=""/></td>
<td><input type="text" name="subHomeDir"
value=""/></td>
<td><input type="text" name="subPriGroup"
value=""/></td>
</tr>
</table>
Now i want to fill the values of textboxes named subAcc, subHomeDir, subPriGroup using javascript. How can i do it ?

There are multiple ways to get the proper DOMElement; including:
Giving each element an id and getting it using document.getElementById
Using document.getElementsByName. This is not preferred since there can be multiple elements with the same name, however there can be only one with the same id.
Using the form directly. For example if your form's name is form1: form1.subAcc
Using document.getElementsByTagName('input') and then getting the proper index.
I'd recommend using the id to retrieve the proper element.

The easiest way would be to give these textboxes a unique id, then reference them like this:
<input type="text" id="subHomeDir" name="subHomeDir" value=""/>
var tb = document.getElementById("subHomeDir");
tb.value = "foo";
If you're stuck with the names only, then you can use document.getElementsByName, just remember, this will return a collection of elements (since names are not necessarily unique), which you'll have to index:
var tb = document.getElementsByName("subHomeDir")[0];
tb.value = "foo";

Alternative to Jeditable for editable table cells

I have been trying to use Jeditable to make my html table editable. However upon much research I found that it is very difficult (if not impossible without a backend) to validate the input.
I really would prefer NOT to use any sort of plugin and simply write/use a bit of Javascript that would make cells editable and allow me to attach jQuery Validator to the input. The data will never get submitted to a backend (will return to default on page refresh) so the solution doesn't need to be complex...will only be using html and Javascript.
The problem with most code snippets I have found using Google is that they seem to get stuck when you click inside a cell and clicking outside the cell doesn't save/submit the change.
Does anyone have a snippet they have used successfully and/or experience using a snippet with Validator?

Well, according to information I got in your another question, you can change that function to:
function appendTable(id)
{
var tbody = document.getElementById(id).getElementsByTagName("tbody")[0];
var i = 0;
var rows = tbody.rows;
for (var r = 0; r < 4; r++) {
var row = rows[r];
for (var c = 0; c < 4; c++) {
var cell = row.cells[c];
cell.firstChild.value = subset[i++]; // the only part changed
}
}
}
when your html looks like:
<table id="alphabetTable" border="1">
<thead>
<tr>
<th>Header1</th>
<th>Header2</th>
<th>Header3</th>
<th>Header4</th>
</tr>
</thead>
<tbody>
<tr>
<td><input type = "text" size="1" /></td>
<td><input type = "text" size="1" /></td>
<td><input type = "text" size="1" /></td>
<td><input type = "text" size="1" /></td>
</tr>
<tr>
<td><input type = "text" size="1" /></td>
<td><input type = "text" size="1" /></td>
<td><input type = "text" size="1" /></td>
<td><input type = "text" size="1" /></td>
</tr>
<tr>
<td><input type = "text" size="1" /></td>
<td><input type = "text" size="1" /></td>
<td><input type = "text" size="1" /></td>
<td><input type = "text" size="1" /></td>
</tr>
</tbody>
</table>
As you could see, I rely on firstChild property, however it can be dangerous, e.g. when your html looks like:
<td> <input type = "text" size=1 /> </td>
then at least FF returns <TextNode textContent=" "> as firstChild. Not to depend on this issue you can go with:
cell.getElementsByTagName("input")[0].value = subset[i++];
PS. All I wrote was based on info I got from another question, if something wrong - comment and I will try to change ;)