ปัจจัยที่ทำให้คีย์ด้วยมือได้ แต่ใช้สแกน scan ทำไม่ได้

<?php
require_once ("secure_area.php");
class Receives extends Secure_area
{
	function __construct()
	{
		parent::__construct('receives');
		$this->load->library('receive_lib');
	}

	function index()
	{
		$this->_reload();
	}

	function item_search()
	{
		$suggestions = $this->Item->get_item_search_suggestions($this->input->post('q'),$this->input->post('limit'));
		echo implode("\n",$suggestions);
	}

	function supplier_search()
	{
		$suggestions = $this->Supplier->get_suppliers_search_suggestions($this->input->post('q'),$this->input->post('limit'));
		echo implode("\n",$suggestions);
	}

	function select_supplier()
	{
		$supplier_id = $this->input->post("supplier");
		$this->receive_lib->set_supplier($supplier_id);
		$this->_reload();
	}

	function change_mode()
	{
		$mode = $this->input->post("mode");
		$this->receive_lib->set_mode($mode);
		$this->_reload();
	}

	function add()
	{
		$data=array();
		$mode = $this->receive_lib->get_mode();
		$item_id_or_number_or_receipt = $this->input->post("item");
		$quantity = $mode=="receive" ? 1:-1;
		if($this->receive_lib->is_valid_receipt($item_id_or_number_or_receipt) && $mode=='return')
		{
			$this->receive_lib->return_entire_receive($item_id_or_number_or_receipt);
		}
		elseif(!$this->receive_lib->add_item($item_id_or_number_or_receipt,$quantity))
		{
			$data['error']=$this->lang->line('receives_unable_to_add_item');
		}
		$this->_reload($data);
	}

	function edit_item($item_id)
	{
		$data= array();

		$this->form_validation->set_rules('price', 'lang:items_price', 'required|numeric');
		$this->form_validation->set_rules('quantity', 'lang:items_quantity', 'required|integer');

		$price = $this->input->post("price");
		$quantity = $this->input->post("quantity");
		$discount = $this->input->post("discount");


		if ($this->form_validation->run() != FALSE)
		{
			$this->receive_lib->edit_item($item_id,$quantity,$discount,$price);
		}
		else
		{
			$data['error']=$this->lang->line('receives_error_editing_item');
		}

		$this->_reload($data);
	}

	function delete_item($item_number)
	{
		$this->receive_lib->delete_item($item_number);
		$this->_reload();
	}

	function delete_supplier()
	{
		$this->receive_lib->delete_supplier();
		$this->_reload();
	}

	function complete()
	{
		$data['cart']=$this->receive_lib->get_cart();
		$data['subtotal']=$this->receive_lib->get_subtotal();
		$data['taxes']=$this->receive_lib->get_taxes();
		$data['total']=$this->receive_lib->get_total();
		$data['receipt_title']=$this->lang->line('receives_receipt');
		$data['transaction_time']= date('m/d/Y h:i:s a');
		$supplier_id=$this->receive_lib->get_supplier();
		$employee_id=$this->Employee->get_logged_in_employee_info()->person_id;
		$comment = $this->input->post('comment');
		$emp_info=$this->Employee->get_info($employee_id);
		$payment_type = $this->input->post('payment_type');
		$data['payment_type']=$this->input->post('payment_type');
		
		if ($this->input->post('amount_tendered'))
		{
			$data['amount_tendered'] = $this->input->post('amount_tendered');
			$data['amount_change'] = to_currency($data['amount_tendered'] - $data['total']);
		}
		$data['employee']=$emp_info->first_name.' '.$emp_info->last_name;

		if($supplier_id!=-1)
		{
			$supp_info=$this->Supplier->get_info($supplier_id);
			$data['supplier']=$supp_info->first_name;
		}

		//SAVE receive to database
		$data['receive_id']='RECEIVES '.$this->Receive->save($data['cart'], $supplier_id,$employee_id,$comment,$payment_type);

		$this->load->view("receives/receipt",$data);
		$this->receive_lib->clear_all();
	}
	
	function receipt($receive_id)
	{
		$receive_info = $this->Receive->get_info($receive_id)->row_array();
		$this->receive_lib->copy_entire_receive($receive_id);
		$data['cart']=$this->receive_lib->get_cart();
		$data['subtotal']=$this->receive_lib->get_subtotal();
		$data['taxes']=$this->receive_lib->get_taxes();
		$data['total']=$this->receive_lib->get_total();
		$data['receipt_title']=$this->lang->line('receives_receipt');
		$data['transaction_time']= date('m/d/Y h:i:s a', strtotime($receive_info['receive_time']));
		$supplier_id=$this->receive_lib->get_supplier();
		$employee_id=$this->Employee->get_logged_in_employee_info()->person_id;
		$emp_info=$this->Employee->get_info($employee_id);
		$data['payment_type']=$receive_info['payment_type'];
		
		$data['employee']=$emp_info->first_name.' '.$emp_info->last_name;

		if($supplier_id!=-1)
		{
			$supp_info=$this->Supplier->get_info($supplier_id);
			$data['supplier']=$supp_info->first_name.' '.$supp_info->last_name;
		}
		$data['receive_id']='RECEIVES '.$receive_id;
		$this->load->view("receives/receipt",$data);
		$this->receive_lib->clear_all();

	}

	function _reload($data=array())
	{
		$person_info = $this->Employee->get_logged_in_employee_info();
		$data['cart']=$this->receive_lib->get_cart();
		$data['modes']=array('receive'=>$this->lang->line('receives_receive'),'return'=>$this->lang->line('receives_return'));
		$data['mode']=$this->receive_lib->get_mode();
		$data['subtotal']=$this->receive_lib->get_subtotal();
		$data['taxes']=$this->receive_lib->get_taxes();
		$data['total']=$this->receive_lib->get_total();
		$data['items_module_allowed'] = $this->Employee->has_permission('items', $person_info->person_id);
		$data['payment_options']=array(
			$this->lang->line('receives_cash') => $this->lang->line('receives_cash'),
			$this->lang->line('receives_check') => $this->lang->line('receives_check'),
			$this->lang->line('receives_debit') => $this->lang->line('receives_debit'),
			$this->lang->line('receives_credit') => $this->lang->line('receives_credit')
		);

		$supplier_id=$this->receive_lib->get_supplier();
		if($supplier_id!=-1)
		{
			$info=$this->Supplier->get_info($supplier_id);
			$data['supplier']=$info->first_name;
		}
		$this->load->view("receives/register",$data);
	}

    function cancel_receive()
    {
        //$this->load->view("receives/receipt",$data);
    	$this->receive_lib->clear_all();
    	$this->_reload();

    }

}
?>

<?php $this->load->view("partial/header"); ?>
<div id="page_title" style="margin-bottom:8px;"><?php echo $this->lang->line('receives_register'); ?></div>
<?php
if(isset($error))
{
	echo "<div class='error_message'>".$error."</div>";
}
?>
<div id="register_wrapper">
<?php echo form_open("receives/change_mode",array('id'=>'mode_form')); ?>
	<span><?php echo $this->lang->line('receives_mode') ?></span>
<?php echo form_dropdown('mode',$modes,$mode,'onchange="$(\'#mode_form\').submit();"'); ?>
</form>
<?php echo form_open("receives/add",array('id'=>'add_item_form')); ?>
<label id="item_label" for="item">

<?php
if($mode=='receive')
{
	echo $this->lang->line('receives_find_or_scan_item');
}
else
{
	echo $this->lang->line('receives_find_or_scan_item_or_receipt');
}
?>
</label>
<?php echo form_input(array('name'=>'item','id'=>'item','size'=>'40'));?>
<div id="new_item_button_register" >
		<?php echo anchor("items/view/-1/width:360",
		"<div class='small_button'><span>".$this->lang->line('receives_new_item')."</span></div>",
		array('class'=>'thickbox none','title'=>$this->lang->line('receives_new_item')));
		?>
</div>

</form>
<table id="register">
<thead>
<tr>
<th style="width:11%;"><?php echo $this->lang->line('common_delete'); ?></th>
<th style="width:30%;"><?php echo $this->lang->line('receives_item_name'); ?></th>
<th style="width:11%;"><?php echo $this->lang->line('receives_price'); ?></th>
<th style="width:11%;"><?php echo $this->lang->line('receives_quantity'); ?></th>
<th style="width:11%;"><?php echo $this->lang->line('receives_discount'); ?></th>
<th style="width:15%;"><?php echo $this->lang->line('receives_total'); ?></th>
<th style="width:11%;"><?php echo $this->lang->line('receives_edit'); ?></th>
</tr>
</thead>
<tbody id="cart_contents">
<?php
if(count($cart)==0)
{
?>
<tr><td colspan='7'>
<div class='warning_message' style='padding:7px;'><?php echo $this->lang->line('receives_no_items_in_cart'); ?></div>
</tr></tr>
<?php
}
else
{
	foreach($cart as $item_id=>$item)
	{
		echo form_open("receives/edit_item/$item_id");
	?>
		<tr>
		<td><?php echo anchor("receives/delete_item/$item_id",'['.$this->lang->line('common_delete').']');?></td>
		<td><?php echo $item['name']; ?></td>

		<?php if ($items_module_allowed)
		{
		?>
			<td><?php echo form_input(array('name'=>'price','value'=>$item['price'],'size'=>'6'));?></td>
		<?php
		}
		else
		{
		?>
			<td><?php echo $item['price']; ?></td>
			<?php echo form_hidden('price',$item['price']); ?>
		<?php
		}
		?>
		<td><?php echo form_input(array('name'=>'quantity','value'=>$item['quantity'],'size'=>'2'));?></td>
		<td><?php echo form_input(array('name'=>'discount','value'=>$item['discount'],'size'=>'3'));?></td>
		<td><?php echo to_currency($item['price']*$item['quantity']-$item['price']*$item['quantity']*$item['discount']/100); ?></td>
		<td><?php echo form_submit("edit_item", $this->lang->line('receives_edit_item'));?></td>
		</tr>
		</form>
	<?php
	}
}
?>
</tbody>
</table>
</div>
<div id="overall_receive">
	<?php
	if(isset($supplier))
	{
		echo $this->lang->line("receives_supplier").': <b>'.$supplier. '</b><br />';
		echo anchor("receives/delete_supplier",'['.$this->lang->line('common_delete').' '.$this->lang->line('suppliers_supplier').']');
	}
	else
	{
		echo form_open("receives/select_supplier",array('id'=>'select_supplier_form')); ?>
		<label id="supplier_label" for="supplier"><?php echo $this->lang->line('receives_select_supplier'); ?></label>
		<?php echo form_input(array('name'=>'supplier','id'=>'supplier','size'=>'30','value'=>$this->lang->line('receives_start_typing_supplier_name')));?>
		</form>
		<div style="margin-top:5px;text-align:center;">
		<h3 style="margin: 5px 0 5px 0"><?php echo $this->lang->line('common_or'); ?></h3>
		<?php echo anchor("suppliers/view/-1/width:350",
		"<div class='small_button' style='margin:0 auto;'><span>".$this->lang->line('receives_new_supplier')."</span></div>",
		array('class'=>'thickbox none','title'=>$this->lang->line('receives_new_supplier')));
		?>
		</div>
		<div class="clearfix">&nbsp;</div>
		<?php
	}
	?>

	<div id='receive_details'>
		<div class="float_left" style="width:55%;"><?php echo $this->lang->line('receives_sub_total'); ?>:</div>
		<div class="float_left" style="width:45%;font-weight:bold;"><?php echo to_currency($subtotal); ?></div>

		<?php foreach($taxes as $name=>$value) { ?>
		<div class="float_left" style='width:55%;'><?php echo $name; ?>:</div>
		<div class="float_left" style="width:45%;font-weight:bold;"><?php echo to_currency($value); ?></div>
		<?php }; ?>

		<div class="float_left" style='width:55%;'><?php echo $this->lang->line('receives_total'); ?>:</div>
		<div class="float_left" style="width:45%;font-weight:bold;"><?php echo to_currency($total); ?></div>
	</div>
	<?php
	if(count($cart) > 0)
	{
	?>
	<div id="finish_receive">
		<?php echo form_open("receives/complete",array('id'=>'finish_receive_form')); ?>
		<br>
		<label id="comment_label" for="comment"><?php echo $this->lang->line('common_comments'); ?>:</label>
		<?php echo form_textarea(array('name'=>'comment','value'=>'','rows'=>'4','cols'=>'23'));?>
		<br><br>
		<table width="100%"><tr><td>
		<?php
			echo $this->lang->line('receives_payment').':   ';?>
		</td><td>
		<?php
		    echo form_dropdown('payment_type',$payment_options);?>
        </td>
        </tr>
        
        <tr>
        <td>
        <?php
			echo $this->lang->line('receives_amount_tendered').':   ';?>
		</td><td>
		<?php
		    echo form_input(array('name'=>'amount_tendered','value'=>'','size'=>'10'));
		?>
        </td>
        </tr>
        
        </table>
        <br>
		<?php echo "<div class='small_button' id='finish_receive_button' style='float:right;margin-top:5px;'><span>".$this->lang->line('receives_complete_receive')."</span></div>";
		?>
		</div>

		</form>

	    <?php echo form_open("receives/cancel_receive",array('id'=>'cancel_receive_form')); ?>
			    <div class='small_button' id='cancel_receive_button' style='float:left;margin-top:5px;'>
					<span>ยกเลิกการรับสินค้า</span>
				</div>
        </form>
	</div>
	<?php
	}
	?>
</div>
<div class="clearfix" style="margin-bottom:30px;">&nbsp;</div>


<?php $this->load->view("partial/footer"); ?>

<script type="text/javascript" language="javascript">
$(document).ready(function()
{
    $("#item").autocomplete('<?php echo site_url("receives/item_search"); ?>',
    {
    	minChars:0,
    	max:100,
       	delay:10,
    	formatItem: function(row) {
			return row[1];
		}
    });

    $("#item").result(function(event, data, formatted)
    {
		$("#add_item_form").submit();
    });

	$('#item').focus();

	$('#item').blur(function()
    {
    	$(this).attr('value',"<?php echo $this->lang->line('receives_start_typing_item_name'); ?>");
    });

	$('#item,#supplier').click(function()
    {
    	$(this).attr('value','');
    });

    $("#supplier").autocomplete('<?php echo site_url("receives/supplier_search"); ?>',
    {
    	minChars:0,
    	delay:10,
    	max:100,
    	formatItem: function(row) {
			return row[1];
		}
    });

    $("#supplier").result(function(event, data, formatted)
    {
		$("#select_supplier_form").submit();
    });

    $('#supplier').blur(function()
    {
    	$(this).attr('value',"<?php echo $this->lang->line('receives_start_typing_supplier_name'); ?>");
    });

    $("#finish_receive_button").click(function()
    {
    	if (confirm('<?php echo $this->lang->line("receives_confirm_finish_receive"); ?>'))
    	{
    		$('#finish_receive_form').submit();
    	}
    });

    $("#cancel_receive_button").click(function()
    {
    	if (confirm('<?php echo $this->lang->line("receives_confirm_cancel_receive"); ?>'))
    	{
    		$('#cancel_receive_form').submit();
    	}
    });


});

function post_item_form_submit(response)
{
	if(response.success)
	{
		$("#item").attr("value",response.item_id);
		$("#add_item_form").submit();
	}
}

function post_person_form_submit(response)
{
	if(response.success)
	{
		$("#supplier").attr("value",response.person_id);
		$("#select_supplier_form").submit();
	}
}

</script>