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I want the table to be sorted in a particular order on load using tablesorter

I have a table which displays like this when I load the page.
But I want the subjects to be in a particular order(math,history,science and physics) but the professor names should be sorted in ascending order.
Can this be done using tablesorter's custom sort?
$('table').tablesorter({
theme: 'blue'
});
<link href="https://mottie.github.io/tablesorter/css/theme.blue.css" rel="stylesheet"/>
<script src="https://mottie.github.io/tablesorter/js/jquery.tablesorter.widgets.js"></script>
<script src="https://mottie.github.io/tablesorter/js/jquery.tablesorter.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table class="tablesorter">
<thead>
<tr>
<th>subject</th>
<th>professor</th>
</tr>
</thead>
<tbody>
<tr>
<td>math</td>
<td>Jordan</td>
</tr>
<tr>
<td>math</td>
<td>Kent</td>
</tr>
<tr>
<td>math</td>
<td>Wayne</td>
</tr>
<tr>
<td>history</td>
<td>Richards</td>
</tr>
<tr>
<td>history</td>
<td>Xavier</td>
</tr>
<tr>
<td>science</td>
<td>Arthur</td>
</tr>
<tr>
<td>science</td>
<td>John</td>
</tr>
<tr>
<td>physics</td>
<td>Steve</td>
</tr>
<tr>
<td>physics</td>
<td>Wade</td>
</tr>
</tbody>
</table>
JSFiddle
Any help is appreciated. Thanks in advance.

To set a custom sort order you should add your own parser. Check this example in the docs.
Then, to order by default both columns, just pass sortList to your configuration object.
And to add an additional forced sort that will be appended to the dynamic selections by the user use sortAppend.
Note that in the snippet below I have switched "Steve" and "Wade" so you can see that the sortList is working.
// add parser through the tablesorter addParser method
$.tablesorter.addParser({
// set a unique id
id: 'subjects',
is: function(s, table, cell, $cell) {
// return false so this parser is not auto detected
return false;
},
format: function(s, table, cell, cellIndex) {
// format your data for normalization
return s.toLowerCase()
.replace(/math/,0)
.replace(/history/,1)
.replace(/science/,2)
.replace(/physics/,3);
},
// set type, either numeric or text
type: 'numeric'
});
$('table').tablesorter({
theme: 'blue',
sortList: [[0,0], [1,0]],
sortAppend : [[1,0]]
});
<link href="https://mottie.github.io/tablesorter/css/theme.blue.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://mottie.github.io/tablesorter/js/jquery.tablesorter.js"></script>
<table class="tablesorter">
<thead>
<tr>
<th class="sorter-subjects">subject</th>
<th>professor</th>
</tr>
</thead>
<tbody>
<tr>
<td>math</td>
<td>Jordan</td>
</tr>
<tr>
<td>math</td>
<td>Kent</td>
</tr>
<tr>
<td>math</td>
<td>Wayne</td>
</tr>
<tr>
<td>history</td>
<td>Richards</td>
</tr>
<tr>
<td>history</td>
<td>Xavier</td>
</tr>
<tr>
<td>science</td>
<td>Arthur</td>
</tr>
<tr>
<td>science</td>
<td>John</td>
</tr>
<tr>
<td>physics</td>
<td>Wade</td>
</tr>
<tr>
<td>physics</td>
<td>Steve</td>
</tr>
</tbody>
</table>

How to actualize sequence for DataTables's rowReorder extension?

I'm using rowReorder extension for DataTables.
I got a button to remove some rows with https://datatables.net/reference/api/row().remove(), but after clicking it, the corresponding sequence number is missing.
How can I actualize this sequence, so it contains the new rows count ?
I tried to manually update the sequence field value, but if you try to drag and drop a row after this, the sequence numbers appears in double.
Here is my code
var t = $('#mytable').DataTable({
'rowReorder': true,
'dom' : '<t>',
});
$('.delbutton').on('click', function() {
t
.row( $(this).parents('tr') )
.remove()
.draw();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
<script src="https://cdn.datatables.net/rowreorder/1.2.0/js/dataTables.rowReorder.min.js"></script>
<link href="https://cdn.datatables.net/rowreorder/1.2.0/css/rowReorder.dataTables.min.css" rel="stylesheet"/>
<link href="https://cdn.datatables.net/1.10.12/css/jquery.dataTables.min.css" rel="stylesheet"/>
<table id="mytable" class="display" cellspacing="0">
<thead>
<th>sequence</th>
<th>datas</th>
<th>delete</th>
</thead>
<tdboy>
<tr>
<td>1</td>
<td>lorem</td>
<td class="delbutton">x</td>
</tr>
<tr>
<td>2</td>
<td>ipsum</td>
<td class="delbutton">x</td>
</tr>
<tr>
<td>3</td>
<td>dolor</td>
<td class="delbutton">x</td>
</tr>
<tr>
<td>4</td>
<td>sit</td>
<td class="delbutton">x</td>
</tr>
</tdboy>
</table>
Thanks,

How to select a specific element with nested table in html using jquery

I have searched and tried some jquery selectors (e.g. :last) but I couldn't figure out which selector should I use. Should I use this also? The problem is, I want to add a row inside of nested <table>, and if I click add button, the only specific <table> can add a row inside it.Here's my example code:
index.html
=========================================================================
<table>
<thead>
<tr>
<th>Name</th>
<th>Age</th>
<th>Address</th>
<th>Gender</th>
<th>My Items</th>
</tr>
</thead>
<tbody>
<tr>
<td>Some Name</td>
<td>30</td>
<td>My Address</td>
<td>Male</td>
<td>
<table>
<thead>
<tr>
<th>Brand</th>
<th>Quantity</th>
<th>Size</th>
<th>Color</th>
</tr>
</thead>
<tbody>
<tr>
<td>Yamaha</td>
<td>30</td>
<td>Large</td>
<td>Black</td>
</tr>
</tbody>
</table>
<button id="AddItem">Add Item</button>
</td>
</tr>
</tbody>
</table>
<button id="AddCustomer">Add Customer</button>
If I clicked the Add Item, 1 row() added below the Yamaha Item.
If I clicked the Add Customer, 1 row() added below the Some Name.
myJS.js code:
=========================================================================
$("#addItem").on('click', function(e) {
$('tr:last').after("Added Row for Items.");
e.preventDefault();
});
<br>
$("#addCustomer").on('click', function(e) {
$('tr:last').after("Added Row for Customer.");
e.preventDefault();
});

I added <tfoot> for the tr.customer and table.cart and placed the buttons therein respectively. It needed classes and ids to make a complex task much easier.
SNIPPET
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1, user-scalable=no">
<title>PO</title>
<style>
table,
td,
th {
border: 1px solid black;
}
</style>
</head>
<body>
<header>
<form id="panel">
</form>
</header>
<section id="I">
<table id='PO1' class="purchaseOrder">
<thead>
<tr>
<th>Name</th>
<th>Age</th>
<th>Address</th>
<th>Gender</th>
<th>Cart</th>
</tr>
</thead>
<tbody>
<tr id='C1' class='customer'>
<td>Some Name</td>
<td>30</td>
<td>My Address</td>
<td>Male</td>
<td>
<table class='cart'>
<thead>
<tr>
<th>Brand</th>
<th>Quantity</th>
<th>Size</th>
<th>Color</th>
</tr>
</thead>
<tbody>
<tr id='item1' class='item'>
<td>Yamaha</td>
<td>30</td>
<td>Large</td>
<td>Black</td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan='3'></td>
<td>
<button class="addItem">Add Item</button>
</td>
</tr>
</tfoot>
</table>
</td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan='3'></td>
<td>
<button class="addCustomer">Add Customer</button>
</td>
</tr>
</tfoot>
</table>
</section>
<footer> </footer>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>
$(".addItem").on('click', function(e) {
$(this).closest('table').find(".item:last").after('<tr class="item"><td>New item</td><td></td><td></td><td></td></tr>');
});
$(".addCustomer").on('click', function(e) {
var newCustomer = $('.customer:last').after('<tr class="customer"><td>New Customer</td><td></td><td></td><td></td></tr>');
var newCart = $('.cart:first').clone(true, true).wrap('td');
newCart.find('tbody').html("").html('<tr class="item"><td>New Item</td><td></td><td></td><td></td></tr>');
$('.customer:last').append(newCart);
e.preventDefault();
});
</script>
</body>
</html>

Give your tables unique ids.
For example:
<table id="customerTable"></table>
<table id="productTable"></table>
$("#addCustomer").on('click', function(e) {
$('#customerTable > tbody').append('<tr><td>New row</td></tr>');
e.preventDefault();
});
If you will use a loop from a data source and there will be more than two tables, you can use closest() or siblings() function to select that tables.
// note, use class instead of using id if there will be multiple buttons.
$('.addCustomer').on('click', function() {
// test if you get the correct table
var table = $(this).closest('table');
console.log(table);
// if above not work try;
var table = $(this).siblings('table');
console.log(table);
// if you successfully get the table you wanted,
table.find('tbody').append('<tr><td>New customer row</tr>');
});

You can try this,
$(document).ready(function () {
$("#AddItem").on('click', function(e) {
$(this).prev().find(' > tbody tr:last').after('<tr><td colspan="4">New Item</td></tr>')
e.preventDefault();
});
$("#AddCustomer").on('click', function(e) {
$(this).prev().find(' > tbody tr:last').after('<tr><td colspan="4">New Customer</td></tr>')
e.preventDefault();
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
<thead>
<tr>
<th>Name</th>
<th>Age</th>
<th>Address</th>
<th>Gender</th>
<th>My Items</th>
</tr>
</thead>
<tbody>
<tr>
<td>Some Name</td>
<td>30</td>
<td>My Address</td>
<td>Male</td>
<td>
<table>
<thead>
<tr>
<th>Brand</th>
<th>Quantity</th>
<th>Size</th>
<th>Color</th>
</tr>
</thead>
<tbody>
<tr>
<td>Yamaha</td>
<td>30</td>
<td>Large</td>
<td>Black</td>
</tr>
</tbody>
</table>
<button id="AddItem">Add Item</button>
</td>
</tr>
</tbody>
</table>
<button id="AddCustomer">Add Customer</button>

Some thing like this
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="StackOverflow_Solve.jQueryAjax.WebForm1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<link href="../Content/bootstrap.min.css" rel="stylesheet" type="text/css" />
<script src="../Scripts/jquery-1.12.0.min.js" type="text/javascript"></script>
<script src="../Scripts/bootstrap.min.js" type="text/javascript"></script>
<script>
$(function () {
// $('#myModal').show();
$('#AddItem').click(function(e) {
e.preventDefault();
var childtable = $(this).closest('tr').find('.childtable');
console.log(childtable);
var mytr = '<tr><td>Yamaha</td><td>1</td><td>Large</td><td>Black</td><td> <button id="remove" class="remove">remove Customer</button></td></tr>';
$('#childtable > tbody:last').append(mytr);
});
$(document).on('focus', '.remove', function (e) {
e.preventDefault();
$(this).parent().parent().remove();
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<table class="table table-bordered">
<thead>
<tr>
<th>Name</th>
<th>Age</th>
<th>Address</th>
<th>Gender</th>
<th>My Items</th>
</tr>
</thead>
<tbody>
<tr>
<td>Some Name</td>
<td>30</td>
<td>My Address</td>
<td>Male</td>
<td>
<table id="childtable" class="childtable">
<thead>
<tr>
<th>Brand</th>
<th>Quantity</th>
<th>Size</th>
<th>Color</th>
</tr>
</thead>
<tbody>
<tr>
<td>Yamaha</td>
<td>30</td>
<td>Large</td>
<td>Black</td>
<td>
<button id="remove" class="remove">remove Customer</button>
</td>
</tr>
</tbody>
</table>
<button id="AddItem">Add Item</button>
</td>
</tr>
</tbody>
</table>
<button id="AddCustomer">Add Customer</button>
</form>
</body>
</html>

Why is this datatable showing no result when for a mobile number?

I have a datatable in which I am putting my data. You can see the code below. I want you to notice that; the code will work perfectly right now. However, when you uncomment the Mobile# from the code & then try searching using profile-ids (8 or 12); it doesn't show the records as it shows without mobile number. I am wondering why.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdn.datatables.net/1.10.10/css/jquery.dataTables.min.css">
<script src="https://cdn.datatables.net/1.10.10/js/jquery.dataTables.min.js"></script>
<script>
$(function() {
$(".datatable").DataTable();
});
</script>
<table class="datatable table table-bordered table-striped">
<thead>
<tr>
<th>Profile id</th>
<th>Name</th>
<th>Surname</th>
<!-- <th>Mobile#</th>-->
</tr>
</thead>
<tfoot>
<tr>
<th>Profile id</th>
<th>Name</th>
<th>Surname</th>
<!-- <th>Mobile#</th>-->
</tr>
</tfoot>
<tbody>
<tr>
<td>1</td>
<td>John</td>
<td>Keller</td>
<!--<td>12123123</td>-->
</tr>
<tr>
<td>2</td>
<td>Donald</td>
<td>Duck</td>
<!-- <td>12123123</td>-->
</tr>
</tbody>
</table>
Fiddle link ... : Fiddle link

This works for me. I cannot see any issues in Chrome at least
I can search for phone 1,2,3, and id 8 to find John, phone 4,5,6 and id 9 to find Duck
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdn.datatables.net/1.10.10/css/jquery.dataTables.min.css">
<script src="https://cdn.datatables.net/1.10.10/js/jquery.dataTables.min.js"></script>
<script>
$(function() {
$(".datatable").DataTable();
});
</script>
<table class="datatable table table-bordered table-striped">
<thead>
<tr>
<th>Profile id</th>
<th>Name</th>
<th>Surname</th>
<th>Mobile#</th>
</tr>
</thead>
<tfoot>
<tr>
<th>Profile id</th>
<th>Name</th>
<th>Surname</th>
<th>Mobile#</th>
</tr>
</tfoot>
<tbody>
<tr>
<td>8</td>
<td>John</td>
<td>Keller</td>
<td>123</td>
</tr>
<tr>
<td>9</td>
<td>Donald</td>
<td>Duck</td>
<td>456</td>
</tr>
</tbody>
</table>

It seems that the search fields searches in all td elements if it contains that value, possibly using regular expressions for this?
I haven't worked with DataTables, but is there a way to set which field it should check in? That would most likely solve your problem.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdn.datatables.net/1.10.10/css/jquery.dataTables.min.css">
<script src="https://cdn.datatables.net/1.10.10/js/jquery.dataTables.min.js"></script>
<script>
$(function() {
$(".datatable").DataTable();
});
</script>
<table class="datatable table table-bordered table-striped">
<thead>
<tr>
<th>Profile id</th>
<th>Name</th>
<th>Surname</th>
<th>Mobile#</th>
</tr>
</thead>
<tfoot>
<tr>
<th>Profile id</th>
<th>Name</th>
<th>Surname</th>
<th>Mobile#</th>
</tr>
</tfoot>
<tbody>
<tr>
<td>1</td>
<td>John</td>
<td>Keller</td>
<td>12123123</td>
</tr>
<tr>
<td>2</td>
<td>Donald</td>
<td>Duck</td>
<td>23232323</td>
</tr>
</tbody>
</table>

Tablesorter does not sort (Jquery 1.8)

I did a lot of research concerning my question, but I didn't find an answer.
The tablesorter does not sort and I don't know why?.
Here is my test file. Can you tell me, what I'm doing wrong?
<html>
<head>
<script type="text/javascript" src="jquery-1.8.0.min.js"></script>
<script type="text/javascript" src="jquery.tablesorter.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#sortable").tablesorter();
});
</script>
</head>
<body>
<table id="sortable">
<thead>
<tr>
<td>Username</td>
<td>Role</td>
</tr>
</thead>
<tbody>
<tr>
<td>SuperAdmin</td>
<td>SuperAdministrator</td>
</tr>
<tr>
<td>Simon</td>
<td>SuperAdministrator</td>
</tr>
<tr>
<td>Manfred</td>
<td>Administrator</td>
</tr>
<tr>
<td>test</td>
<td>test</td>
</tr>
</tbody>
</table>
</body>
</html>
I've got the jQuery file, the tablesorter.js...
the files are loaded correctly, cause I can read them (using firebug)...
Please help me, because I prefer not to write a tablesorter by myself.

For the headers (Username and Role), use <th> instead of <td>
See this JSFiddle
Use this:
<thead>
<tr>
<th>Username</th>
<th>Role</th>
</tr>
</thead>
Instead of:
<thead>
<tr>
<td>Username</td>
<td>Role</td>
</tr>
</thead>