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JQuery: Finding a way to name cloned input fields

I'm not the best at using jQuery, but I do require it to be able to make my website user-friendly.
I have several tables involved in my website, and for each the user should be able to add/delete rows. I created a jquery function, with help from stackoverflow, and it successfully added/deleted rows. Now the only problem with this is the names for those input fields is slightly messed up. I would like each input field to be an array: so like name[0] for the first row, name[1] for the second row, etc. I have a bunch of tables all with different inputs, so how would I make jQuery adjust the names accordingly?
My function, doesn't work completely, but I do not know how to go about changing it.
My Jquery function looks like:
$(document).ready(function() {
$("body").on('click', '.add_row', function() {
var tr = $(this).closest('.row').prev('table').find('tr.ia_table:last');
var clone = tr.clone();
clone.find("input").val('');
clone.find("select").val('');
clone.find('input').each(function(i) {
$(this).attr('name', $(this).attr('name') + i);
});
clone.find('select').each(function(i) {
$(this).attr('name', $(this).attr('name') + i);
});
tr.after(clone);
});
$("body").on('click', '.delete_row', function() {
var rowCount = $(this).closest('.row').prev('table').find('tr.ia_table').length;
var tr = $(this).closest('.row').prev('table').find('tr.ia_table:last');
if (rowCount > 1) {
tr.remove();
};
});
});
I also created a jsFiddle here: https://jsfiddle.net/tareenmj/err73gLL/.
Any help is greatly appreciated.
UPDATE - Partial Working Solution
After help from a lot of users, I was able to create a function which does this:
$("body").on('click', '.add_row', function() {
var tr = $(this).closest('.row').prev('table').find('tr.ia_table:last');
var clone = tr.clone();
clone.find("input").val('');
clone.find("select").val('');
clone.find('input').each(function() {
var msg=$(this).attr('name');
var x=parseInt(msg.split('[').pop().split(']').shift());
var test=msg.substr(0,msg.indexOf('['))+"[";
x++;
x=x.toString();
test=test+x+"]";
$(this).attr('name', test);
});
clone.find('select').each(function() {
var msg1=$(this).attr('name');
var x1=parseInt(msg1.split('[').pop().split(']').shift());
var test1=msg1.substr(0,msg1.indexOf('['))+"[";
x1++;
x1=x1.toString();
test1=test1+x1+"]";
$(this).attr('name', test1);
});
tr.after(clone);
});
A working jsFiddle is here: https://jsfiddle.net/tareenmj/amojyjjn/2/
The only problem is that if I do not select any of the options in the select inputs, it doesn't provide me with a value of null, whereas it should. Any tips on fixing this issue?

I think I understand your problem. See if this fiddle works for you...
This is what I did, inside each of the clone.find() functions, I added the following logic...
clone.find('input').each(function(i) {
// extract the number part of the name
number = parseInt($(this).attr('name').substr($(this).attr('name').indexOf("_") + 1));
// increment the number
number += 1;
// extract the name itself (without the row index)
name = $(this).attr('name').substr(0, $(this).attr('name').indexOf('_'));
// add the row index to the string
$(this).attr('name', name + "_" + number);
});
In essence, I separate the name into 2 parts based on the _, the string and the row index. I increment the row index every time the add_row is called.
So each row will have something like the following structure when a row is added...
// row 1
sectionTB1_1
presentationTB1_1
percentageTB1_1
courseTB1_1
sessionTB1_1
reqElecTB1_1
// row 2
sectionTB1_2
presentationTB1_2
percentageTB1_2
courseTB1_2
sessionTB1_2
reqElecTB1_2
// etc.
Let me know if this is what you were looking for.

Full Working Solution for Anyone Who needs it
So after doing loads and loads of research, I found a very simple way on how to do this. Instead of manually adjusting the name of the array, I realised that the clone method will do it automatically for you if you supply an array as the name. So something like name="name[]" will end up working. The brackets without any text has to be there. Explanation can't possible describe the code fully, so here is the JQuery code required for this behaviour to work:
$(document).ready(function() {
$("body").on('click', '.add_row', function() {
var tr = $(this).closest('.row').prev('table').find('tr.ia_table:last');
var clone = tr.clone();
clone.find("input").val('');
tr.after(clone);
});
$("body").on('click', '.delete_row', function() {
var rowCount =
$(this).closest('.row').prev('table').find('tr.ia_table').length;
var tr = $(this).closest('.row').prev('table').find('tr.ia_table:last');
if (rowCount > 1) {
tr.remove();
};
});
});
A fully working JSfiddle is provided here: https://jsfiddle.net/tareenmj/amojyjjn/5/
Just a tip, that you have to be remove the disabled select since this will not pass a value of null.

How to divide sum by 2 if checkbox checked? javascript/html

Like written in the Title. I am trying to get the sum from some fields - this is working fine already. But I want to add a function that if the check box is checked before and I press the "Calculate" Button the sum should be divided / 2 automatically. I don't have the code I already have in the moment but if its needed I will upload later. But for now maybe its some easy thing and very general. Maybe someone can give some example already. kind regards

Since you did not provide any markup, you should do something like this, but adapted to your code:
var sum = calculateSum();
if ($("#checkbox").is(':checked')) sum = sum/2;

$('#calculateButton').on('click', function(){
// do summation and assign it to sum variable
var sum = sumCalculation();
if ($('#checkbox').is(':checked'))
{
sum = sum/2;
}
});

You may try:
$("#checkbox").change(function(){
if($(this).is(':checked')){
// do the division
}
});
Assuming your checkbox would have id="checkbox"

var chksum = document.getElementById('u r checkbox ID').checked;
if(chksum=="true")
{
sum=sum/2;
}

Try this. Note let the id of checkbox is #checkbox
var sum = 10;
$("#checkbox").change(function(){
if($(this).is(':checked')){
sum /=2;
}
alert(sum);
});

Iterate through appended items using jQuery

Question
I have a form that uses jQuery for magic. On that form is a button Add Account. That button appends fields Account and Amount and also another button Remove Account (which if you can guess, removes those two fields). This all works nicely...
On the same form there is another field Salary, which I would like to compare with the total of all the Amount fields. The problem is when I use jQuery's $.each() to iterate through the Amount fields it only recognizes those fields that were present in the DOM when the page loaded, and not the newly added fields.
How can I iterate through these appended Amount fields? (Or maybe there is a better to do this altogether?)
What I'm doing now:
$(document).ready(function(){
$('#form').on('keyup', '.amount', balanceAmountsWithSalary);
});
var balanceAmountsWithSalary = function(){
var salary = parseInt($('#salary').val(),10);
var total = 0;
$('#accounts .account').each(function(){
var amount = parseInt($(this).find('.amount').val(),10);
total += amount;
});
if (total === salary) {
$('#accounts .account').each(function(){
// Do some stuff to each input.amount located in div.account
});
} else {
$('#accounts .account').each(function(){
// Do some BAD stuff to each input.amount located in div.account
});
}
}
Thanks!
Answer
So it probably would've been more helpful to include the rest of my code at the outset as the problem was a simple error in the add account event. I mislabeled my container class adding an "s" to name of the appended items only. In any case thats for the comments! Posting an example on jsFiddle helped me find this error, so here is the thing in action in case you were wondering.

As HTML code and code of Dynamic adding inputs are not provided, I have edited an existing Fiddler to get total of dynamic added input field.
In this fiddler simple for loop is used to calculate total amount.
Here is a fiddler which might help you.
//button click get total
$('#GetTotal').click( function(event){
var tableID = "NewInvoiceTable";
GetTotalAmount(tableID);
return false;
});
//Get total
function GetTotalAmount(tableID)
{
var i = $('#' + tableID + ' tr').length;
alert("Total Rows -" + i);
var TotAmt = 0;
for(j=0;j<i;j++)
{
TotAmt += parseInt($('#TotalInline-' + j).val());
}
alert("Total Amount - " + TotAmt);
}

Getting NaN during calculation

I am trying to calculate the total of a selection of CDs in addition of P&P. The code I'm using is coming to a total of NaN?
Very confused here. what am I doing wrong?
function calculateTotal() {
var Collection method = document.getElementById('collection').value +
var select CDs = document.getElementById('selectCD').value;
var total = document.getElementById('total');
total.value = 'collection'(total) + 'selectCD'(total);
}
Here is a JSFiddle with the full code.

In your fiddle collection and selectCD are divs (not inputfields) containing inputfields. You can't do divElm.value.
Then the php-code in your fiddle would normally be able to output more then one cd, so you'd need to add the totals of the selected cd's to.
The minimum changes needed to get your code working are:
function calculateTotal(){
var coll = document.getElementsByName('deliveryType'),
cds = document.getElementsByName('cd[]'),
cdTot = 0,
L = coll.length;
while(L--){if(coll[L].checked){ //get shipping costs
coll=Number(coll[L].getAttribute('title')); break;
} }
L=cds.length;
while(L--){if(cds[L].checked){ //add total prices
cdTot += Number(cds[L].getAttribute('title'));
} }
// output total
document.getElementById('total').value = coll + cdTot;
}
Also you'd want to set some more triggers to function calculateTotal (from the shipping costs and selected cd's; this way, if they change, the total-field will update to).
See this working fiddle with these changes (and some other fixes) based on your fiddle so you can get motivated seeing it (calculation) in action.
However I do hope this is for a school-question and not for a live webshop. I would re-think my strategy as I think you are currently working your way to a big security hole.
Good luck!

Adding up a load of input boxes

This may have been answered before, but I cannot find a solution that works.
I need to add the subtotal input boxes up and output them as a grandTotal. Sounds simple, and I thought it would be, but for some reason I cannot get it to function properly.
To save time I have created a jsFiddle - http://jsfiddle.net/wgrills/hKxgU/4/
Edit: Sorry to be poor at posting the question.
I missed out most of the items because I wanted to speed the jsfiddle up. I have updated the jsFiddle - http://jsfiddle.net/wgrills/hKxgU/7/.
If you click on the + or - buttons the subtotal changes, that is all good. But I can't get the #grandTotal input to update. The problem appears to be with the:
var grandTotal = 0;
$(".subtotal").each(function() {
$(this).css("border-color","#f00");
grandTotal += $(this).val.split("£")[1];
});
$("#grandTotal").val("£" + grandTotal);
alert(grandTotal);
part of the js. Note the css border change and the alert is just there for me to make sure the script is working.
The code is all early days, this is just a quick mock up.

You gave two problems, very easy to solve!
You are correct that the piece above that you posted is part of the problem. In particular the line:
grandTotal += $(this).val.split("£")[1];
You missed the () after val, so the code WOULD have broken here, because it doesn't know what .val. is.
Also, the code you posted was after a return false; this effectively tells the function is has finished, don't bother doing anything after that line.
However, as you need that section of code in both functions (clicks) its worth wrapping it in a function of its own:
function updateGrandTotal() {
var grandTotal = 0;
$(".subtotal").each(function() {
$(this).css("border-color", "#f00");
grandTotal += parseFloat($(this).val().split("£")[1]);
});
$("#grandTotal").val("£" + grandTotal);
alert(grandTotal);
}
And calling it just before you inform the function its finished:
updateGrandTotal();
return false;
See it partially working here
However, while this will work on the plus of an item, you have another problem, when you are minusing an item, and the box gets to zero, instead of setting £0.00 you set it to 0, hence when it try's to split on the "£" it can't. To combat this simply copy the bit where you turn your price value into a price from the plus function into the minus function:
Replace:
newprice = price * x;
$('#' + update).val(x);
$('#' + update + '_subtotal').val(newprice);
With the working version:
newprice = (price * x) / 100;
newprice = newprice.toFixed(2);
newprice = '£' + newprice;
$('#' + update).val(x);
$('#' + update + '_subtotal').val(newprice);
See it fully working here

Your problem is with the following line:
grandTotal += $(this).val.split("£")[1];
val is a function, not a property on the returned object. You want the following instead:
grandTotal += $(this).val().split("£")[1];
Also in your fiddle you have a return false; in the middle of your function, which lies above the code you're calling val incorrectly on. Remove that return as well.