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Javascript calculation (Products sum without Vat)

Hello I have a problem with some calculation in javascript(see image)
The cell that is with red border calculate product price sum with vat.
What im trying to do but didnt success is to calculate product price sum WITHOUT VAT(the cell with red broder should be 2000 not 2200)
Here is the code that im using,
var row_no = (new Date).getTime();
var newTr = $('<tr id="row_' + row_no + '" class="row_' + item_id + '" data-item-id="' + item_id + '"></tr>');
tr_html = '<td><input name="product_id[]" type="hidden" class="rid" value="' + product_id + '"><input name="product[]" type="hidden" class="rcode" value="' + item_code + '"><input name="product_name[]" type="hidden" class="rname" value="' + item_name + '"><input name="product_option[]" type="hidden" class="roption" value="' + item_option + '"><input name="part_no[]" type="hidden" class="rpart_no" value="' + item_supplier_part_no + '"><span class="sname" id="name_' + row_no + '">' + item_code +' - '+ item_name +(sel_opt != '' ? ' ('+sel_opt+')' : '')+' <span class="label label-default">'+item_supplier_part_no+'</span></span> <i class="pull-right fa fa-edit tip edit" id="' + row_no + '" data-item="' + item_id + '" title="Edit" style="cursor:pointer;"></i></td>';
if (site.settings.product_expiry == 1) {
tr_html += '<td><input class="form-control date rexpiry" name="expiry[]" type="text" value="' + item_expiry + '" data-id="' + row_no + '" data-item="' + item_id + '" id="expiry_' + row_no + '"></td>';
}
tr_html += '<td class="text-right"><input class="form-control input-sm text-right rcost" name="net_cost[]" type="hidden" id="cost_' + row_no + '" value="' + item_cost + '"><input class="rucost" name="unit_cost[]" type="hidden" value="' + unit_cost + '"><input class="realucost" name="real_unit_cost[]" type="hidden" value="' + item.row.real_unit_cost + '"><span class="text-right scost" id="scost_' + row_no + '">' + formatMoney(item_cost) + '</span></td>';
tr_html += '<td><input name="quantity_balance[]" type="hidden" class="rbqty" value="' + item_bqty + '"><input class="form-control text-center rquantity" name="quantity[]" type="text" tabindex="'+((site.settings.set_focus == 1) ? an : (an+1))+'" value="' + formatQuantity2(item_qty) + '" data-id="' + row_no + '" data-item="' + item_id + '" id="quantity_' + row_no + '" onClick="this.select();"><input name="product_unit[]" type="hidden" class="runit" value="' + product_unit + '"><input name="product_base_quantity[]" type="hidden" class="rbase_quantity" value="' + base_quantity + '"></td>';
if (po_edit) {
tr_html += '<td class="rec_con"><input name="ordered_quantity[]" type="hidden" class="oqty" value="' + item_oqty + '"><input class="form-control text-center received" name="received[]" type="text" value="' + formatDecimal(unit_qty_received) + '" data-id="' + row_no + '" data-item="' + item_id + '" id="received_' + row_no + '" onClick="this.select();"><input name="received_base_quantity[]" type="hidden" class="rrbase_quantity" value="' + qty_received + '"></td>';
}
if (site.settings.product_discount == 1) {
tr_html += '<td class="text-right"><input class="form-control input-sm rdiscount" name="product_discount[]" type="hidden" id="discount_' + row_no + '" value="' + item_ds + '"><span class="text-right sdiscount text-danger" id="sdiscount_' + row_no + '">' + formatMoney(0 - (item_discount * item_qty)) + '</span></td>';
}
tr_html += '<td class="text-right"><span class="text-right ssubtotal" id="subtotal_' + row_no + '">' + formatMoney((parseFloat(item_cost) * parseFloat(item_qty))) + '</span></td>';
if (site.settings.tax1 == 1) {
tr_html += '<td class="text-right"><input class="form-control input-sm text-right rproduct_tax" name="product_tax[]" type="hidden" id="product_tax_' + row_no + '" value="' + pr_tax.id + '"><span class="text-right sproduct_tax" id="sproduct_tax_' + row_no + '">' + (pr_tax_rate ? '(' + pr_tax_rate + ')' : '') + ' ' + formatMoney(pr_tax_val * item_qty) + '</span></td>';
}
tr_html += '<td class="text-right"><span class="text-right ssubtotal" id="subtotal_' + row_no + '">' + formatMoney(((parseFloat(item_cost) + parseFloat(pr_tax_val)) * parseFloat(item_qty))) + '</span></td>';
tr_html += '<td class="text-center"><i class="fa fa-times tip podel" id="' + row_no + '" title="Remove" style="cursor:pointer;"></i></td>';
newTr.html(tr_html);
newTr.prependTo("#poTable");
total += formatDecimal(((parseFloat(item_cost) + parseFloat(pr_tax_val)) * parseFloat(item_qty)), 4);
count += parseFloat(item_qty);
an++;
if(!belong)
$('#row_' + row_no).addClass('warning');
});
var col = 2;
if (site.settings.product_expiry == 1) { col++; }
var tfoot = '<tr id="tfoot" class="tfoot active"><th colspan="'+col+'">Total</th><th class="text-center">' + formatQty(parseFloat(count) - 1) + '</th>';
if (po_edit) {
tfoot += '<th class="rec_con"></th>';
}
if (site.settings.product_discount == 1) {
tfoot += '<th class="text-right">'+formatMoney(product_discount)+'</th>';
}
tfoot += '<th class="text-right">'+formatMoney(total)+'</th>';
if (site.settings.tax1 == 1) {
tfoot += '<th class="text-right">'+formatMoney(product_tax)+'</th>';
}
tfoot += '<th class="text-right">'+formatMoney(total)+'</th><th class="text-center"><i class="fa fa-trash-o" style="opacity:0.5; filter:alpha(opacity=50);"></i></th></tr>';
$('#poTable tfoot').html(tfoot);

You set the total which you display right here:
total += formatDecimal(((parseFloat(item_cost) + parseFloat(pr_tax_val)) * parseFloat(item_qty)), 4);
For you to display a price without vat you need another variable for it
var totalNoVAT = 0;
and in the loop:
totalNoVAT += formatDecimal((parseFloat(item_cost) * parseFloat(item_qty)), 4);
and finally display it by changing this:
tfoot += '<th class="text-right">'+formatMoney(total)+'</th>';
to this:
tfoot += '<th class="text-right">'+formatMoney(totalNoVAT)+'</th>';

Adding Dynamic Inputs , getting value from Dynamic dynamic generate input

I created a dynamic Form with JavaScript, with AddChapitre function and I want to get number value from an input text <input type="text" class="form-control" id="grandTitreNbr1">. And created "numbers value" inputs when I click to addChapitre button using AddFeild() function <button id="b1" class="btn btn-primary" onclick="addFields()">add titres</button> .
The problem is when I click in addChapitre I get the The Chapitre Form hidden.
Here is it in JsFiddle : http://jsfiddle.net/javagose/6veqe55v/1/
This image will show the problem:
function addChapitre() {
var newdiv = document.createElement('div');
var addChapitre =
'<div class="panel panel-success"> <div class="panel-heading"> <h2 class="panel-title">' +
'<a data-toggle="collapse" data-target="#collapse" href="#collapse" class="collapsed">chapitre : ' + j +
' </a></h2></div><div class="panel-body" id="Chapitre' + j + '">';
newdiv.innerHTML += addChapitre;
addChapitre1 =
'<div class="panel-collapse" id="collapse' + j + '" >' +
'<form class="form-horizontal"><div class="form-group">' +
'<label for ="ChapTitre' + j + '">Titre du chapitre</label>' +
'<input type="text" class="form-control" id="ChapTitre' + j +
'" placeholder=" titre du chapitre ' + j + '"></div></form></div>';
newdiv.innerHTML += addChapitre1;
addChapitre2 =
'<div class="panel panel-success" id="grandTitres' + j + '">' +
'<div class="panel-heading"><h2 class="panel-title">' +
'<a data-toggle="collapse" data-target="#collapseTitre" ' +
'href="#collapseTitre" class="collapsed"> Grands titres des chapitre: ' + j + '</a></h2></div>';
newdiv.innerHTML += addChapitre2;
addChapitre2 =
'<div class="panel-body"><div class="panel-collapse" id="collapseTitre" >' +
'<form class="form-horizontal"><div class="form-group" id ="grandTitres1">' +
'<label for ="grandTitreNbr1"> GRAND TITRE</label>' +
'<input type="text " class="form-control" id="grandTitreNbr' + j + '">' +
'<button id="b1" class="btn btn-primary" onclick="addFields()">add titres</button>' +
'<div id="grandTitresDiv' + j + '">' +
'</div></div> </form></div></div> </div></div></div>';
newdiv.innerHTML += addChapitre2;
document.getElementById('conteneur').appendChild(newdiv);
j++;
}
function addFields() {
var number = document.getElementById("grandTitreNbr" + j + "").value;
var container = document.getElementById("grandTitresDiv" + j + "");
for (i = 0; i < number; i++) {
// Append a node with a random text
var newdiv = document.createElement('div');
var grandTitreTxt =
'<input type="text" class="form-control" id="grandTitreTxt' + j +
'" name="grandTitreTxt' + j + '"></div>';
newdiv.innerHTML += grandTitreTxt;
var grandTitreUpload =
'<div class="checkbox"><label><input type="checkbox"> Pdf </label></div>' +
' <input type="file" name="fichier" id="fichier"' + j + ' accept="pdf" />';
newdiv.innerHTML += grandTitreUpload;
var grandTitreUpload =
'<div class="checkbox"><label><input type="checkbox">video </label>' +
'</div> <input type="file" name="fichier" id="fichier"' + j +
' accept="video" />';
newdiv.innerHTML += grandTitreUpload;
container.appendChild(newdiv);
// Append a line break
container.appendChild(document.createElement("br"));
}
}

Sum values Javascript

Here http://webmark.pt/sharepics/orders.png is the sales order layout (./sharepics/add.zip the full code) that I need to customize.
Problem:
Dynamically sum the cells between size 39 and 50, and put the value in the Pairs (quantity).
Already managed to add the lines, but the result is added to the lines immediately below.
The code that does this operation:
var newTr = $('<tr id="row_' + count + '"></tr>');
newTr.html('<td><input name="product' + count + '" type="hidden" value="' + item_code + '"><input class="span5 tran" name="item' + count + '" type="text" value="' + item_code + '"></td>
.......
<td><input class="input-block-level text-center" name="sort' + count + '" type="text" value="" id="sort-' + count + '" onClick="this.select();"></td>
<td><input class="input-block-level text-center" name="size39' + count + '" type="text" value="" id="size39-' + count + '" onClick="this.select();"></td>
......
<td><input class="input-block-level text-center" name="size50' + count + '" type="text" value="" id="size50-' + count + '" onClick="this.select();"></td>
<td><input class="input-block-level text-center" name="quantity' + count + '" type="text" value="1" id="quantity-' + count + '" onClick="this.select();"></td>
<td><input class="span2 tran" style="text-align:right;" name="unit_price' + count + '" type="text" id="price-' + count + '" value="' + item_price + '"></td>
<?php echo '<td><input class="span2 tran2" name="cart\'+ count +\'" type="text" value="" required="required" data-error="' . $this->lang->line("cart") . ' ' . $this->lang->line("is_required") . '"></td>';
if (DISCOUNT_OPTION == 2) {
echo '<td><select class="span2 select tran" data-placeholder="Select..." name="discount\' + count + \'" id="discount-\' + count + \'">';
foreach ($discounts as $discount) {
echo "<option value=" . $discount->id;
if ($discount->id == DEFAULT_DISCOUNT) {
echo ' selected="selected"';
}
echo ">" . $discount->name . "</option>";
}
echo '</select></td>';
}
?>
<td><input class="input-block-level text-center" name="subtotalpares' + count + '" type="text" value="" id="subtotalpares" disabled onClick="this.select();"></td>
<td><i class="icon-trash tip del" id="' + count + '" title="Remove this Item" style="cursor:pointer;" data-placement="right"></i></td>');
newTr.prependTo("#dyTable");
count++;
an++;
total += parseFloat(item_price);
$("input[id^=size]").keyup(function () {
var sum = 0;
$("input[id^=size]").each(function () {
sum += (parseInt(this.value) ? parseInt(this.value) : 1);
});
$("input[id^=quantity]").val(sum);
});
I look forward to some help!

When selecting a file, the File upload input doesn't update the value

I'm using Javascript to dynamically add floor plans where a user can add and attach images to hotel floors.
How do I make the File upload input update it's value to what the user chose?
if the button is set on page load, it works fine, but if it's generated by Javascript, then the user's choice of file to upload isn't accepted and put into the VALUE="" field (stays empty).
I recreated it using js fiddle: http://jsfiddle.net/6fays32v/1/
HTML
<div id="floor_plans_container">
<div id="unassigned">
Test
</div>
</div>
Javascript
var floor_number = $('h2').length;
var html = '<div id="0" class="plan_page">' +
' <h2 class="closeable">Floor Plan '+floor_number+'<span class="rooms_count"> </span></h2>' +
' <div class="plan_wrapper form_section">' +
' <div class="plan_form">' +
' <form target="iframe_0" enctype="multipart/form-data" method="post" action="" id="form_0" name="form_0">' +
' <input type="hidden" value="0" id="0" name="plan_id">' +
' <input type="hidden" value="" id="room_ids_db_0" name="room_ids_db">' +
' <div id="buttons_wrapper_plan">' +
' <button class="save_changes" name="plan_save" type="submit">Save</button>' +
' ' +
' </div>' +
' <table border="0" cellspacing="0" cellpadding="0" class="floor_plan">' +
' <tbody><tr>' +
' <td>' +
' <label for="name">Floor Plan Name</label>' +
' </td>' +
' <td>' +
' <input type="text" value="Floor Plan 1" id="name" name="name">' +
' </td>' +
' </tr>' +
' <tr>' +
' <td>' +
' <label for="file">Background Image</label>' +
' </td>' +
' <td>' +
' <input type="file" value="" class="file_upload" name="file_upload"> ' +
' <iframe onload="" src="" id="iframe_0" name="iframe_0" class="iframe"></iframe>' +
' </td>' +
' </tr>' +
' <tr>' +
' <td>' +
' <label for="room_size">Room Size</label>' +
' </td>' +
' <td>' +
' <div class="room_size on"></div>' +
' <input type="hidden" value="1" class="room_size_large" name="room_size_large">' +
' </td>' +
' </tr>' +
' </tbody></table>' +
' </form>' +
' </div>' +
' <div>' +
' <div style="" class="plan image small">' +
' </div>' +
' </div>' +
' </div>' +
' </div>';
$("#floor_plans_container #unassigned").html(html);
If you try to select a file, you'll see that the VALUE="" of the input stays the same - that's the problem.
What am I doing wrong?
Thanks in advance!

JavaScript cannot alter the value of an input of type "file". It's a security thing.
Otherwise you could do something like run all kinds of hidden forms on a page and upload files via Ajax without a user knowing about it.

document.getElementById is returning null on the button click

I have a textarea and a button. The button submits the data to a page through AJAX through a function. When the button is clicked it calls a function that takes in 3 parameters for this question only one of them is necessary.
Let's look at the code to understand more clearly:
var offers = <? php echo PostOffer::GetOffers($_GET["id"]); ?> ;
for (var i = 0; i < offers.length; i++) {
var date = offers[i].Date.split(" ");
document.write('<div class="row-fluid offer">' +
'<div class="span2">' +
'<img class="profile_picture" src="' + offers[i].Picture_Path + '" />' +
'</div>' +
'<div class="span10">' +
'<div class="row-fluid">' +
'<div class="username">' +
'<p style="font-weight: bold;">' + offers[i].Name + '</p>' +
'</div>' +
'</div>' +
'<div class="row-fluid">' +
'<div class="content">' +
'<p class="content">' + offers[i].Text + '</p>' +
'<textarea class="hide span12" id="edited_content">' + offers[i].Text + '</textarea>' +
'<button type="button" class="hide btn btn-primary btn-small" id="save_edits" onclick=\'editPostOffer("<?php echo $_GET["id"]; ?>","' + offers[i].Offer_ID + '","' + document.getElementById("edited_content") + '");\'>Save Edits</button> ' +
'<button type="button" class="hide btn btn-primary btn-small cancel_edits">Cancel Edits</button>' +
'</div>' +
'</div>' +
'<div class="row-fluid">' +
'<div class="date">' +
'<p class="pull-right"><strong><span class="muted">Offered on: </span></strong>' + date[0] + '</p>' +
'</div>');
if (offers[i].Username == "<?php echo $_SESSION["
username "]; ?>") {
document.write('<div class="controls pull-right">' +
'Edit ' +
'Delete | ' +
'</div>');
}
document.write('</div>' +
'</div>' +
'</div>' +
'<hr />');
}
The important part is:
...
'<div class="row-fluid">' +
'<div class="content">' +
'<p class="content">' + offers[i].Text + '</p>' +
'<textarea class="hide span12" id="edited_content">' + offers[i].Text + '</textarea>' +
'<button type="button" class="hide btn btn-primary btn-small" id="save_edits" onclick=\'editPostOffer("<?php echo $_GET["id"]; ?>","' + offers[i].Offer_ID + '","' + document.getElementById("edited_content") + '");\'>Save Edits</button> ' +
'<button type="button" class="hide btn btn-primary btn-small cancel_edits">Cancel Edits</button>' +
'</div>' +
'</div>' +
...
The most important is:
...
'<button type="button" class="hide btn btn-primary btn-small" id="save_edits" onclick=\'editPostOffer("<?php echo $_GET["id"]; ?>","' + offers[i].Offer_ID + '","' + document.getElementById("edited_content") + '");\'>Save Edits</button> ' +
...
In the onclick of that button the function document.getElementById("edited_content") returns a null value. I've tried logging it to the console it prints null. Why is that happening?
Any help would be appreciated!

Because at the point you call document.getElementById("edited_content"), edited_content does not exist.
You are creating it by appending a string, so you'd need to do something like:
// Add the first part
document.write('<div class="row-fluid offer">' +
'<div class="span2">' +
'<img class="profile_picture" src="' + offers[i].Picture_Path + '" />' +
'</div>' +
'<div class="span10">' +
'<div class="row-fluid">' +
'<div class="username">' +
'<p style="font-weight: bold;">' + offers[i].Name + '</p>' +
'</div>' +
'</div>' +
'<div class="row-fluid">' +
'<div class="content">' +
'<p class="content">' + offers[i].Text + '</p>' +
'<textarea class="hide span12" id="edited_content">' + offers[i].Text + '</textarea>');
// Now we can get edited_content
document.write('<button type="button" class="hide btn btn-primary btn-small" id="save_edits" onclick=\'editPostOffer("<?php echo $_GET["id"]; ?>","' + offers[i].Offer_ID + '","' + document.getElementById("edited_content") + '");\'>Save Edits</button> ');
// Write the rest of the HTML
document.write('<button type="button" class="hide btn btn-primary btn-small cancel_edits">Cancel Edits</button>' +
'</div>' +
'</div>' +
'<div class="row-fluid">' +
'<div class="date">' +
'<p class="pull-right"><strong><span class="muted">Offered on: </span></strong>' + date[0] + '</p>' +
'</div>');
P.S. You tagged the question with jQuery - there are much better ways of doing what you are trying to achieve. Better still, use a templating engine.