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update data from different table


Ronel

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<?php 
$con = new mysqli("localhost","root","","loginsystem");

$errors = array();
if($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST['updatestock'])):
/*
echo "<pre>";
print_r($_POST);	 
echo "</pre>";
*/
	$fields = array(	
		 "itemname" => "Item Name"
	    ,"purchaseid" => "Purchase ID"	
	    ,"poqty" => "Purchase Order QTY"
	    
	); 
	
	foreach($fields as $field => $label):
		if(empty($_POST[$field])): 
			array_push($errors,"Please Enter ".$label);
		endif;
	endforeach;
	
	if(empty($errors)):
		$sqlstockid = "SELECT `id` FROM `stock_orders` WHERE stockid = ? LIMIT 1"; 
		$querystockid = $con->prepare($sqlstockid);	
		$querystockid->bind_param("i", $_POST['stockid']); 
		$querystockid->execute(); 
		$resultstockid = $querystockid->get_result();	
		$rowstockid = $resultstockid->fetch_assoc();

		if(!empty($rowstockid)){ 
			array_push($errors,"This Purchase ID already exists");
		}
	endif;		
	
	
	if(empty($errors)):	
	
		$today = date('Y-m-d');
		
		$sqlstockorder = "INSERT INTO `stock_orders`(`id`, `stockid`, `poqty`, `remarks`) 
		VALUES (?,?,?,?)";
		
		$querystockorder = $con->prepare($sqlstockorder);		
		$querystockorder->bind_param("iiis", $_POST['id'], $_POST['stockid'], $_POST['poqty'], $remarks); 		
		$querystockorder->execute();
	
	
		$sqlstock = "UPDATE `stock` SET 
		`stockqty` =  ABS(COALESCE(stockqty,0)+?)		
		WHERE `id` = ?";
		$querystock = $con->prepare($sqlstock);		
		$querystock->bind_param("ii", $_POST['poqty'], $_POST['id']); 		
		$querystock->execute();
		$num = $con -> affected_rows;			
		$message = (!empty($num) ? "Stock Updated" : 'No Changes Made');	
		
		header("refresh: 3; URL=edit.php");
	endif;
	
endif;

$sql = "SELECT `itemname` FROM `stock`";
$res = mysqli_query($con, $sql);
?>


<!DOCTYPE html>
<html>
<head>
    <title></title>
    <script type="text/javascript" src="fetch.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js"></script>
    </head>
<body>
	
        
<?php	

if(!empty($message)):
	echo '<div style="width:500px; text-align: center; margin:20px auto;">'."\r";
		echo '<span style="color:green"><b>'.$message.'</b></span></br >'."\r";
	echo '</div>'."\r";
endif;
if(!empty($errors)):
	echo '<div style="width:500px; text-align: center; margin:20px auto;">'."\r";
	foreach($errors as $error):
		echo '<span style="color:red">'.$error.'</span></br >'."\r";
	endforeach;
	echo '</div>'."\r";
endif;



			
if($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST['itemname'])){

		echo '<form action="" method="post">
			<table class="table table-bordered">
				<thead class="table-primary" style="white-space:nowrap;">
				<th>Stock ID</th>	 
				<th>Item Name</th>
				<th>Stock Quantity</th>
				<th>Remarks</th>				
				<th>Update Stocks</th>
				</thead>'."\r";	
		
			$sql = "select `id`, `itemname` from stock where itemname = ? "; 
			$query = $con->prepare($sql);		
			$query->bind_param("s",$_POST['itemname']); 		
			$query->execute();
			$result = $query->get_result();
			while($rows = $result->fetch_assoc()){	
			
				//$purchaseid = (!empty($_POST['purchaseid']) ? $_POST['purchaseid'] : '');
				//$poqty = (!empty($_POST['poqty']) ? $_POST['poqty'] : '');
			
				echo '<tr>
					<td><input style="width:100%" type="text" name="id" value="'.$rows['id'].'" readonly /></td>
					<td><input style="width:100%" type="text" name="itemname" value="'.$rows['itemname'].'" readonly /></td>
					<td><input style="width:100%" type="text" name="stockqty" value="'.$stockqty.'" /></td>
					<td><input style="width:100%" type="text" name="remarks" value="'.$remarks.'" /></td>					
					<td><input style="width:100%" type="submit" name="updatestock" value="Update" /></td>
				</tr>'."\r";
			}
		echo '</table>
	</form>'."\r";
	         
}else{ 
	echo '<b class="d-inline p-2 bg-primary text-white">Update Stock Here</b><hr>    
	<b>Select Item to update :</b> 
    <select id="itemname" onchange="selectItem()">
        <option value="Select Item here" selected>Select Item here</option>'."\r";
	
		while ($rows = mysqli_fetch_array($res)){		 
			echo '<option value="'.$rows['itemname'].'">'.$rows['itemname'].'</option>'."\r";
		}
		   
    echo '</select><br><br>'."\r";
	echo '<div id="ans"></div>';
}
?>
	
	<script type="text/javascript">
		function selectItem(){
			    var x = document.getElementById("itemname").value;
			    
			    $.ajax({
			       url:"edit.php",
			        method: "POST",
			        data:{
			            itemname : x
			        },
	        success:function(DataView){
	        $("#ans").html(DataView);
	    }
  
});
		}
	</script>
    </body>
</html>

below is my two different tables stock and stock_orders

save.png.520f880078a2cdd593e84c38b8e2b691.pngUntitled.thumb.png.4b389d2a9347cfdb5d1a7c4b95ac3c6c.png

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Have you added any debugging code?  Something that verifies that you are not creating any errors?  LIke when you do a prepare do you check the result?  When you run the query do you check if it ran?  Do you have error checking enabled and turned on?  All important things when you are having problems to solve.  Echo out the results of things when you don't think you are getting the right answers.   All part of being a good coder.

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