Re-order data when click a column header (new field)

php_solution_order_by new_field

1. click html header -> generate new url with query string including new orderby field name
2. php parse query string, handle filed name 


//html

<tr><td align="left" width="10%" class="table_toprow"><div class="orderby" id="job_serial_number"><b>Serial Number</b></div></td>
		                <td align="left" width="10%" class="table_toprow"><div id="invoice_status"><b>Invoice Status</b></div></td>
                        <td align="left" width="20%" class="table_toprow"><div class="orderby" id="job_name"><b>Name</b></div></td>
                        <td align="left" width="10%" class="table_toprow"><div class="orderby" id="job_brand"><b>Brand</b></div></td>
                        <td align="left" width="10%" class="table_toprow"><div class="orderby" id="cl_companyname"><b>Client</b></div></td>
                        <td align="left" width="10%" class="table_toprow"><div class="orderby" id="job_client_contact"><b>Contact</b></div></td>
                        <td align="left" width="10%" class="table_toprow"><div class="orderby" id="agnt_surname"><b>Agent</b></div></td>
                        <td align="left" width="10%" class="table_toprow"><div id="job_date"><b>Date</b></div></td>
                </tr>
                
// css

<style>
.orderby:hover{
	cursor:pointer;		
}
</style>


// javascript

   <script type="application/javascript">
   function updateQueryStringParameter(uri, key, value) {
		var re = new RegExp("([?|&])" + key + "=.*?(&|$)", "i");
		separator = uri.indexOf('?') !== -1 ? "&" : "?";
	  	if (uri.match(re)) {
			return uri.replace(re, '$1' + key + "=" + value + '$2');
		}else {
			return uri + separator + key + "=" + value;
		}
	}
   $('document').ready(function(){
	   $('div.orderby').click(function(event){
			window.location.href = updateQueryStringParameter(window.location.href, "orderby",  this.id);
		});
	});
   </script>
   
   
// php

// parames $orderby_input -  what feild you want to order by
// parames $session_order_key - key used by session for the field
// parames $session_asc_key - key used by session for the field
// return string like "order by surname ASC"

// example updateOrderby('client_surname', 'surname', 'asc_order')
// client_surname => field name
// surname => $_SESSION['surname']
// asc_order => $_SESSION['asc_order']
// return like "client_surname ASC" or "client_surname DESC"


	function updateOrderby($orderby_input, $session_order_key,  $session_asc_key){ 
		if($orderby_input == $_SESSION[$session_order_key]){
			if(!empty($_SESSION[$session_asc_key]) && $_SESSION[$session_asc_key] == "ASC"){
				$_SESSION[$session_asc_key] = 'DESC';
			}else if(!empty($_SESSION[$session_asc_key]) && $_SESSION[$session_asc_key] == "DESC"){
				$_SESSION[$session_asc_key] = 'ASC';
			}	
		}else{
				$_SESSION[$session_order_key] = $orderby_input;
				$_SESSION[$session_asc_key] = 'ASC';
		}
		return $_SESSION[$session_order_key].' '.$_SESSION[$session_asc_key];
	}