Develop Reference

How to get total sum from input values using Javascript?

I want to display the total sum of values shown in the amount input-boxes in the next field named sub total without refreshing page.
JS-code for sum of n numbers:
function Mul(index) {
var quantity = document.getElementsByClassName("quantity")[index].value;
var price = document.getElementsByClassName("price")[index].value;
document.getElementsByClassName("amount")[index].value = quantity * price;
}
<table class="table table-center table-hover" id="myTable">
<thead>
<tr>
<th>Description</th>
<th>Quantity</th>
<th>Unit Price</th>
<th>Amount</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="" class=" quantity form-control"
onkeyup="Mul('0') , Add()">
</td>
<td>
<input type="number" id="" class="price form-control"
onkeyup="Mul('0')">
</td>
<td>
<input type="text" id="amount-0" class="amount form-control"
disabled>
</td>
</tr>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="" class=" quantity form-control"
onkeyup="Mul('1')">
</td>
<td>
<input type="number" id="" class="price form-control"
onkeyup="Mul('1')">
</td>
<td>
<input type="text" id="amount-1" class="amount form-control"
disabled>
</td>
</tr>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="" class=" quantity form-control"
onkeyup="Mul('2')">
</td>
<td>
<input type="number" id="" class="price form-control"
onkeyup="Mul('2')">
</td>
<td>
<input type="text" id="amount-2" class="amount form-control"
disabled>
</td>
</tr>
</tbody>
</table>
<div class="table-responsive">
<table class="table table-stripped table-center table-hover">
<thead></thead>
<tbody>
<tr>
<td></td>
<td></td>
<td></td>
<td class="text-end">Sub Total</td>
<td class="text-end">0</td>
</tr>
</tbody>
</table>
</div>

I don't know why, but obviously rare are those who understand that using a form has benefits ...
const myForm = document.forms['my-form']
myForm.oninput = ({target: elm}) => // for any change iside the form
{
let
row = elm.closest('tr')
, Dsc = row.querySelector('input[name^="desc"]')
, Qte = row.querySelector('input[name^="quantity"')
, Prx = row.querySelector('input[name^="price"')
, Amt = row.querySelector('input[name^="amount"')
;
Dsc.required = (Qte.valueAsNumber > 0)
switch (elm.name.split('_')[0]) {
case 'quantity':
case 'price':
Amt.value = Qte.valueAsNumber * Prx.valueAsNumber
myForm.SubTotal.textContent =
[...myForm.querySelectorAll('input[name^="amount"')]
.reduce((sum,el)=>sum + +el.value,0)
break;
}
}
myForm.onsubmit = e =>
{
e.preventDefault() // disable form submiting
let formInputs = Object.fromEntries( new FormData(myForm).entries() )
console.clear()
console.log( formInputs)
}
table {
border-collapse: collapse;
margin : 2em 1em;
}
td, th {
padding : .2em;
border : 1px solid darkblue;
}
input {
width : 6em;
text-align : right;
}
td:first-of-type input {
width : 10em;
text-align : left;
}
<form name="my-form">
<table>
<thead>
<tr> <th>Description</th> <th>Quantity</th> <th>Unit Price</th> <th>Amount</th> </tr>
</thead>
<tbody>
<tr>
<td> <input type="text" name="desc_1" > </td>
<td> <input type="number" name="quantity_1" value="0" min="0"> </td>
<td> <input type="number" name="price_1" value="0" min="0"> </td>
<td> <input type="text" name="amount_1" disabled value="0"></td>
</tr>
<tr>
<td> <input type="text" name="desc_2" > </td>
<td> <input type="number" name="quantity_2" value="0" min="0"> </td>
<td> <input type="number" name="price_2" value="0" min="0"> </td>
<td> <input type="text" name="amount_2" disabled value="0"></td>
</tr>
<tr>
<td> <input type="text" name="desc_3" > </td>
<td> <input type="number" name="quantity_3" value="0" min="0"> </td>
<td> <input type="number" name="price_3" value="0" min="0"> </td>
<td> <input type="text" name="amount_3" disabled value="0"></td>
</tr>
</tbody>
<tfoot>
<td colspan="4"> Sub Total : <output name="SubTotal">0</output> </td>
</tfoot>
</table>
<button type="submit">submit</button>
</form>

You can assign an id to the subtotal cell and change its value on every Mul call.
Something like this :
function Mul(index) {
var quantity = document.getElementsByClassName("quantity")[index].value;
var price = document.getElementsByClassName("price")[index].value;
document.getElementsByClassName("amount")[index].value = quantity * price;
const subTotalField = document.getElementById("subTotal");
subTotalField.innerHTML = parseInt(subTotalField.innerHTML) + quantity * price;
}
<html>
<body>
<table class="table table-center table-hover" id="myTable">
<thead>
<tr>
<th>Description</th>
<th>Quantity</th>
<th>Unit Price</th>
<th>Amount</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="" class=" quantity form-control"
onkeyup="Mul('0') , Add()">
</td>
<td>
<input type="number" id="" class="price form-control"
onkeyup="Mul('0')">
</td>
<td>
<input type="text" id="amount-0" class="amount form-control"
disabled>
</td>
</tr>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="" class=" quantity form-control"
onkeyup="Mul('1')">
</td>
<td>
<input type="number" id="" class="price form-control"
onkeyup="Mul('1')">
</td>
<td>
<input type="text" id="amount-1" class="amount form-control"
disabled>
</td>
</tr>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="" class=" quantity form-control"
onkeyup="Mul('2')">
</td>
<td>
<input type="number" id="" class="price form-control"
onkeyup="Mul('2')">
</td>
<td>
<input type="text" id="amount-2" class="amount form-control"
disabled>
</td>
</tr>
</tbody>
</table>
<div class="table-responsive">
<table class="table table-stripped table-center table-hover">
<thead></thead>
<tbody>
<tr>
<td></td>
<td></td>
<td></td>
<td class="text-end">Sub Total</td>
<td id="subTotal" class="text-end">0</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>

how to use javascript functions multiple times

I'm running a code where I must create a function and call it multiple times. I am having trouble calling it more than once.
how to use Mul() function in second table row.
Please help Me.
Thanks.
function Mul() {
var quantity = document.getElementById("quantity").value;
var price = document.getElementById("price").value;
document.getElementById(id).value = quantity * price;
}
<table class="table table-center table-hover" id="myTable">
<thead>
<tr>
<th>Description</th>
<th>Quantity</th>
<th>Unit Price</th>
<th>Amount</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="quantity" class="form-control" onkeyup="Mul()">
</td>
<td>
<input type="number" id="price" class="form-control" onkeyup="Mul()">
</td>
<td>
<input type="text" id="amount" class="form-control" disabled>
</td>
</tr>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="quantity" class="form-control">
</td>
<td>
<input type="number" id="price" class="form-control">
</td>
<td>
<input type="text" id="result" class="form-control" disabled>
</td>
</tr>
</tbody>
</table>

Add class name for every input and pass index to Mul() function
try below code.
function Mul(index) {
var quantity = document.getElementsByClassName("quantity")[index].value;
var price = document.getElementsByClassName("price")[index].value;
document.getElementsByClassName("amount")[index].value = quantity * price;
}
<table class="table table-center table-hover" id="myTable">
<thead>
<tr>
<th>Description</th>
<th>Quantity</th>
<th>Unit Price</th>
<th>Amount</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="" class=" quantity form-control" onkeyup="Mul('0')">
</td>
<td>
<input type="number" id="" class="price form-control" onkeyup="Mul('0')">
</td>
<td>
<input type="text" id="amount" class="amount form-control" disabled>
</td>
</tr>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="" class=" quantity form-control" onkeyup="Mul('1')">
</td>
<td>
<input type="number" id="" class="price form-control" onkeyup="Mul('1')">
</td>
<td>
<input type="text" id="amount" class="amount form-control" disabled>
</td>
</tr>
<tr>
<td>
<input type="text" class="form-control">
</td>
<td>
<input type="number" id="" class=" quantity form-control" onkeyup="Mul('2')">
</td>
<td>
<input type="number" id="" class="price form-control" onkeyup="Mul('2')">
</td>
<td>
<input type="text" id="amount" class="amount form-control" disabled>
</td>
</tr>
</tbody>
</table>

jQuery change other value if main input form is (on.change)

I am using Laravel and javascript + jQuery then, what I need is if I click the select option value, it will change the other form input based on (count value).
Here is my preview image :
nah if i click the value of select option in "Tipe Biaya" column, it will count jumlah column*biaya operational column then put the result in total column (in One row).
here my Html code:
<table class="table table-bordered table-responsive-md table-striped text-center">
<thead>
<tr>
<th class="text-center">Nama Cabang</th>
<th class="text-center">Jumlah</th>
<th class="text-center">Biaya Operasional</th>
<th class="text-center">Tipe Biaya</th>
<th class="text-center">Total</th>
</tr>
</thead>
<tbody class="distributionList">
#foreach($branches as $key => $fb)
<tr>
<td class="pt-3-half text-left">
{{ $fb->name }}
</td>
<td class="pt-3-half">
<input type="number" class="form-control product_quantity" name="product_quantity[{{$fb->id}}]" id="product_quantity" value="" placeholder="0">
</td>
<td class="pt-3-half">
<input type="number" class="form-control each_operational_cost" name="each_operational_cost[{{$fb->id}}]" id="each_operational_cost" value="" placeholder="0">
</td>
<td class="pt-3-half">
<select class="form-control operational_cost_type" name="operational_cost_type" id="operational_cost_type">
<option value="pecentage">Pecentage</option>
<option value="flat">Number</option>
</select>
</td>
<td class="pt-3-half">
<input type="text" class="form-control total_operational_cost" name="total_operational_cost[{{$fb->id}}]" id="total_operational_cost" value="" placeholder="0" readonly>
</td>
</tr>
#endforeach
</tbody>
</table>
Here my JavaScript and jQuery
$(document).ready(function(){
var count = 0;
$(".operational_cost_type").each(function() {
$(this).change(function(){
event.preventDefault();
var var_operational_cost_type = $(this).val();
var var_each_operational_cost = $(this).closest('.each_operational_cost');
var var_total_operational_cost = $(this).find('.total_operational_cost').val();
console.log(var_each_operational_cost);
});
count++;
});
});
Thank you so much!

You can get value of jumlah and biaya column using $(this).closest("tr").find.. then simply use .val() to add result inside your total column inputs.
Demo Code :
$(document).ready(function() {
var count = 0;
//if you need on chnage of input as well(else remove that input[type=number]..)
$(document).on("change input", ".operational_cost_type , input[type=number]", function() {
event.preventDefault();
var var_operational_cost_type = $(this).val();
var selector = $(this).closest("tr")
//get product quantity
var product_quantity = selector.find('.product_quantity').val();
var total_operational_cost = selector.find('.total_operational_cost')
//get opertional cost
var each_operational_cost = selector.find('.each_operational_cost').val();
//mutliply and add total to total col
total_operational_cost.val(product_quantity * each_operational_cost)
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table class="table table-bordered table-responsive-md table-striped text-center">
<thead>
<tr>
<th class="text-center">Nama Cabang</th>
<th class="text-center">Jumlah</th>
<th class="text-center">Biaya Operasional</th>
<th class="text-center">Tipe Biaya</th>
<th class="text-center">Total</th>
</tr>
</thead>
<tbody class="distributionList">
<tr>
<td class="pt-3-half text-left">
something
</td>
<td class="pt-3-half">
<input type="number" class="form-control product_quantity" name="product_quantity[{{$fb->id}}]" id="product_quantity" value="0" placeholder="0">
</td>
<td class="pt-3-half">
<input type="number" class="form-control each_operational_cost" name="each_operational_cost[{{$fb->id}}]" id="each_operational_cost" value="0" placeholder="0">
</td>
<td class="pt-3-half">
<select class="form-control operational_cost_type" name="operational_cost_type" id="operational_cost_type">
<option value="pecentage">Pecentage</option>
<option value="flat">Number</option>
</select>
</td>
<td class="pt-3-half">
<input type="text" class="form-control total_operational_cost" name="total_operational_cost[{{$fb->id}}]" id="total_operational_cost" value="0" placeholder="0" readonly>
</td>
</tr>
<tr>
<td class="pt-3-half text-left">
something1
</td>
<td class="pt-3-half">
<input type="number" class="form-control product_quantity" name="product_quantity[{{$fb->id}}]" id="product_quantity" value="0" placeholder="0">
</td>
<td class="pt-3-half">
<input type="number" class="form-control each_operational_cost" name="each_operational_cost[{{$fb->id}}]" id="each_operational_cost" value="0" placeholder="0">
</td>
<td class="pt-3-half">
<select class="form-control operational_cost_type" name="operational_cost_type" id="operational_cost_type">
<option value="pecentage">Pecentage</option>
<option value="flat">Number</option>
</select>
</td>
<td class="pt-3-half">
<input type="text" class="form-control total_operational_cost" name="total_operational_cost[{{$fb->id}}]" id="total_operational_cost" value="0" placeholder="0" readonly>
</td>
</tr>
<tr>
<td class="pt-3-half text-left">
something2
</td>
<td class="pt-3-half">
<input type="number" class="form-control product_quantity" name="product_quantity[{{$fb->id}}]" id="product_quantity" value="0" placeholder="0">
</td>
<td class="pt-3-half">
<input type="number" class="form-control each_operational_cost" name="each_operational_cost[{{$fb->id}}]" id="each_operational_cost" value="0" placeholder="0">
</td>
<td class="pt-3-half">
<select class="form-control operational_cost_type" name="operational_cost_type" id="operational_cost_type">
<option value="pecentage">Pecentage</option>
<option value="flat">Number</option>
</select>
</td>
<td class="pt-3-half">
<input type="text" class="form-control total_operational_cost" name="total_operational_cost[{{$fb->id}}]" id="total_operational_cost" value="0" placeholder="0" readonly>
</td>
</tr>
</tbody>
</table>

How to add extra row on a table by clicking

I am trying to create an invoice system and I need to add a function to add extra rows.
What I have looks like this:
$(document).ready(function() {
$("#addrow").click(function(){
$(".item-row:last").after('
<tr class="item-row">
<td>#</td>
<td>New Item</td>
<td>New</td>
<td>New</td>
<td>New</td>
<td>New</td>
<td>New</td>
</tr>');
bind();
});
});
<table>
<tr>
<th>#</th>
<th>Type</th>
<th>Location</th>
<th>Item</th>
<th>Cost</th>
<th>Days</th>
<th>Price</th>
</tr>
<tr class="item-row">
<td>1</td>
<td>Type</td>
<td>Location</td>
<td>Item</td>
<td>100</td>
<td>2</td>
<td>200</td>
</tr>
<tr id="hidden-row">
<td colspan=7>
<a id="addrow" href="javascript:;" title="Add a row">Add a row</a>
</td>
</tr>
What I want to do but have no idea how to do it is: click Add a row, and have an extra row to add more products. I did some research and came across some example and I took the code for the script from there but I do not know if I left part of the script out. I am using, html, php and js any help will be greatly appreciated! thank you in advanced.

You need to use `` instead of '' if its multiple line html. Also, you need to use .bind():
$(document).ready(function() {
$("#addrow").click(function() {
$(".item-row:last").after(`
<tr class="item-row">
<td>#</td>
<td>New</td>
<td>New</td>
<td>New</td>
<td>New</td>
<td>New</td>
<td>New</td>
</tr>`)
.bind();
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<tr>
<th>#</th>
<th>Type</th>
<th>Location</th>
<th>Item</th>
<th>Cost</th>
<th>Days</th>
<th>Price</th>
</tr>
<tr class="item-row">
<td>1</td>
<td>Type</td>
<td>Location</td>
<td>Item</td>
<td>100</td>
<td>2</td>
<td>200</td>
</tr>
<tr id="hidden-row">
<td colspan=7>
<a id="addrow" href="javascript:;" title="Add a row">Add a row</a>
</td>
</tr>
</table>

$(document).ready(function() {
var iCnt=0;
$('#FaqsTable').on('click','#addCF',function() {
if(iCnt<=100) {
iCnt=iCnt+1;
$("#FaqsTable").append('<tr>'+
//'<td> <div class=" col-md-9"><div class="gt_privacy_field default_width"> <input type="text" class="c_ph" id="POID" name="POID[]" value="" placeholder="POID" /></div></div></td>' +
'<td style="display:none"><input type="text" class="c_ph" id="BillDetailID" name="BillDetailID[]" value="0" placeholder="Select Item" style="width:150px" /></td>'+
'<td><input type="text" class="form-control" id="Perticulars" name="Perticulars[]" value="" placeholder="Enter Perticular" style="width:400px"/></td>'+
'<td><input type="text" class="form-control" id="Amount" name="Amount[]" value="0" placeholder="Enter Amount" style="width:150px"/></td>'+
'<td class="hidden" style="display:none"><input type="text" class="Flag sm-form-control" id="Flag" name="Flag[]" value="I" placeholder="Flag" /></td>'+
'<td><p class="fa fa-trash-o m-r-5" style="color:red"></p>Remove</td> '+
'</tr>');
}
});
$("#FaqsTable").on('click','#remCF',function() {
var flag=$(this).closest('tr').find(".Flag").val();
if(flag=="I") {
$(this).closest('tr').remove();
}
else(flag=="U")
{
$(this).closest("tr").hide();
$(this).closest('tr').find(".Flag").val("D");
}
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<div class="form-group row">
<div class="table-responsive">
<table id="FaqsTable" class="table table-bordered nobottommargin">
<tr style="background-color:#b5aeae">
<th style="text-align:center;width:400px;">Perticular </th>
<th style="text-align: center; width: 150px;">Amount </th>
<th style="text-align: center; width: 100px;">Action</th>
<tr />
<tr>
<td style="display:none">
<input type="text" class="form-control" id="BillDetailID" name="BillDetailID[]" value="0" placeholder="ItemName" style="width:150px" required />
</td>
<td>
<input type="text" class="form-control" id="Perticulars" name="Perticulars[]" value="" placeholder="Enter Perticular" style="width:400px" required />
</td>
<td>
<input type="text" class="form-control" id="Amount" name="Amount[]" value="0" placeholder="EnterAmount" style="width:150px" required />
</td>
<td>
<p class="fa fa-plus" style="color:green"></p>Add
</td>
</tr>
</table>
</div>
</div>
$(document).ready(function() {
var iCnt=0;
$('#FaqsTable').on('click','#addCF',function() {
if(iCnt<=100) {
iCnt=iCnt+1;
$("#FaqsTable").append('<tr>'+
//'<td> <div class=" col-md-9"><div class="gt_privacy_field default_width"> <input type="text" class="c_ph" id="POID" name="POID[]" value="" placeholder="POID" /></div></div></td>' +
'<td style="display:none"><input type="text" class="c_ph" id="BillDetailID" name="BillDetailID[]" value="0" placeholder="Select Item" style="width:150px" /></td>'+
'<td><input type="text" class="form-control" id="Perticulars" name="Perticulars[]" value="" placeholder="Enter Perticular" style="width:400px"/></td>'+
'<td><input type="text" class="form-control" id="Amount" name="Amount[]" value="0" placeholder="Enter Amount" style="width:150px"/></td>'+
'<td class="hidden" style="display:none"><input type="text" class="Flag sm-form-control" id="Flag" name="Flag[]" value="I" placeholder="Flag" /></td>'+
'<td><p class="fa fa-trash-o m-r-5" style="color:red"></p>Remove</td> '+
'</tr>');
}
});
$("#FaqsTable").on('click','#remCF',function() {
var flag=$(this).closest('tr').find(".Flag").val();
if(flag=="I") {
$(this).closest('tr').remove();
}
else(flag=="U")
{
$(this).closest("tr").hide();
$(this).closest('tr').find(".Flag").val("D");
}
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div class="form-group row">
<div class="table-responsive">
<table id="FaqsTable" class="table table-bordered nobottommargin">
<tr style="background-color:#b5aeae">
<th style="text-align:center;width:400px;">Perticular </th>
<th style="text-align: center; width: 150px;">Amount </th>
<th style="text-align: center; width: 100px;">Action</th>
<tr />
<tr>
<td style="display:none">
<input type="text" class="form-control" id="BillDetailID" name="BillDetailID[]" value="0" placeholder="ItemName" style="width:150px" required />
</td>
<td>
<input type="text" class="form-control" id="Perticulars" name="Perticulars[]" value="" placeholder="Enter Perticular" style="width:400px" required />
</td>
<td>
<input type="text" class="form-control" id="Amount" name="Amount[]" value="0" placeholder="EnterAmount" style="width:150px" required />
</td>
<td>
<p style="color:green"></p>Add
</td>
</tr>
</table>
</div>
</div>

line delete function does not work well

I have created a table that contains a dynamic form, so when clicked add button will display a new row with the same form each line. and I have also made ​​the switch to clear the form, but it is not going well. anything because there are other functions in the action to remove that line. The following coding that I have made.
html:
<table class="table table-striped area-table tabel-form-makanan">
<thead>
<tr>
<th>Nama Makanan</th>
<th>Jenis Makanan</th>
<th>Harga Makanan</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<input type="text" name="nama-makanan[]" style="height: 30px; width: 280px;" class="nama-makanan" placeholder="ketikkan nama makanan"/>
<input type="hidden" name="id-makanan[]" class="id-makanan"/>
</td>
<td>
<input type="text" readonly name="nama-jenis-makanan[]" style="height: 30px; width: 280px;" class="nama-jenis-makanan" placeholder="nama jenis makanan"/>
</td>
<td>
<input type="text" readonly name="harga-makanan[]" rel="hargaMakanan" style="height: 30px; width: 280px; text-align: right;" class="harga-makanan" placeholder="harga satuan makanan"/>
</td>
<td>
<a class="btn hapus-baris-makanan" style="display: none;"><i class="icon-remove"></i></a>
</td>
</tr>
</tbody>
</table>
<button class="btn btn-primary tombol-tambah-makanan" type="button" style="float: right; margin-right: 10px;">Tambah</button>
javascript for dynamic form:
$('.tombol-tambah-makanan').on('click', function(){
var tr = '<tr>\n\
<td><input type="text" name="nama-makanan[]" style="height: 30px; width: 280px;" class="nama-makanan" placeholder="ketikkan nama makanan"/><input type="hidden" name="id-makanan[]" class="id-makanan"/></td>\n\
<td><input type="text" readonly name="nama-jenis-makanan[]" style="height: 30px; width: 280px;" class="nama-jenis-makanan" placeholder="nama jenis makanan"/></td>\n\
<td><input type="text" readonly name="harga-makanan[]" rel="hargaMakanan" style="height: 30px; width: 280px; text-align: right;" class="harga-makanan" placeholder="harga satuan makanan"/></td>\n\
<td><a class="btn hapus-baris-makanan"><i class="icon-remove"></i></a></td>\n\
</tr>';
$("table.tabel-form-makanan tbody").append(tr);
});
javascript for delete form:
$('.tabel-form-makanan').on( 'click', '.hapus-baris-makanan', function(){
var parent = $(this).parents('tr');
var harga = $('.harga-makanan', parent).val();
pengurangan_pesanan(harga);
$(this).closest('tr').remove();
});
other javascript:
function pengurangan_pesanan(price) {
if (subtotal > 0) {
var kembali = 0;
subtotal -= parseFloat(price);
$('.subtotal').val(subtotal);
if (cek_bayar != isNaN || cek_bayar != 0) {
kembali = cek_bayar - subtotal;
$('.kembali').val(kembali);
}
}
}
Do you have a solution to this problem, I really need it. thank you
*demo : http://jsfiddle.net/daniwarrior/ANfFe/1/