the program works fine but i still get these two errors "Notice: Undefined index: command in E:\wamp\wamp\www\crt\shoppingcart.php on line 7
Notice: Undefined index: command in E:\wamp\wamp\www\crt\shoppingcart.php on line 10
Notice: Undefined index: command in E:\wamp\wamp\www\crt\shoppingcart.php on line 13
" and "
Notice: Undefined index: cart in E:\wamp\wamp\www\crt\shoppingcart.php on line 71".
how can i get rid off these two error?please help me.
products.php
<?php
$connect=mysql_connect("localhost","root","") or die("Connection fail, please try again later");
mysql_select_db("shopping") or die("Database not found try again later, please try again later");
session_start();
?>
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Products</title>
<script language="javascript">
function addtocart(pid){
document.form1.productid.value=pid;
document.form1.command.value='add';
document.form1.submit();
}
</script>
</head>
<body>
<form name="form1" action="productsck.php">
<input type="hidden" name="productid" />
<input type="hidden" name="command" />
</form>
<div align="center">
<h1 align="center">Products</h1>
<table border="0" cellpadding="2px" width="600px">
<?php
$result=mysql_query("SELECT * FROM products");
if(mysql_num_rows($result)>0){
while($row=mysql_fetch_array($result)){
?>
<tr>
<td><img src="<?php echo $row['picture'] ?>" /></td>
<td> <b><?php echo $row['name']?></b><br />
<?php echo $row['description']?><br />
Price:<big style="color:green">
$<?php echo $row['price']?></big><br /><br />
<input type="button" value="Add to Cart" onclick="addtocart(<?php echo $row['serial']?>)" />
</td>
</tr>
<tr><td colspan="2"><hr size="1" /></td>
<?php } }
else die("not selected");
?>
</table>
</div>
</body>
</html>
shoppingcart.php
<?php
include("includes/db.php");
include("includes/functions.php");
if($_REQUEST['command']=='delete' && $_REQUEST['pid']>0){
remove_product($_REQUEST['pid']);
}
else if($_REQUEST['command']=='clear'){
unset($_SESSION['cart']);
}
else if($_REQUEST['command']=='update'){
$max=count($_SESSION['cart']);
for($i=0;$i<$max;$i++){
$pid=$_SESSION['cart'][$i]['productid'];
$q=intval($_REQUEST['product'.$pid]);
if($q>0 && $q<=999){
$_SESSION['cart'][$i]['qty']=$q;
}
else{
$msg='Some proudcts not updated!, quantity must be a number between 1 and 999';
}
}
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Shopping Cart</title>
<script language="javascript">
function del(pid){
if(confirm('Do you really mean to delete this item')){
document.form1.pid.value=pid;
document.form1.command.value='delete';
document.form1.submit();
}
}
function clear_cart(){
if(confirm('This will empty your shopping cart, continue?')){
document.form1.command.value='clear';
document.form1.submit();
}
}
function update_cart(){
if(confirm('do you want to update your shopping cart?')){
document.form1.command.value='update';
document.form1.submit();
}
}
</script>
</head>
<body>
<form name="form1" method="POST" >
<input type="hidden" name="pid" />
<input type="hidden" name="command" />
<div style="margin:0px auto; width:600px;" >
<div style="padding-bottom:10px">
<h1 align="center">Your Shopping Cart</h1>
<input type="button" value="Continue Shopping" onclick="window.location='products.php'" />
</div>
<div style="color:#F00"><?=$msg?></div>
<table border="0" cellpadding="5px" cellspacing="1px" style="font-family:Verdana, Geneva, sans-serif; font-size:11px; background-color:#E1E1E1" width="100%">
<?php
if($_SESSION['cart']){
echo '<tr bgcolor="#FFFFFF" style="font-weight:bold"><td>Serial</td><td>Name</td><td>Price</td><td>Qty</td><td>Amount</td><td>Options</td></tr>';
$max=count($_SESSION['cart']);
for($i=0;$i<$max;$i++){
$pid=$_SESSION['cart'][$i]['productid'];
$q=$_SESSION['cart'][$i]['qty'];
$pname=get_product_name($pid);
if($q==0) continue;
?>
<tr bgcolor="#FFFFFF"><td><?php echo $i+1?></td><td><?php echo $pname?></td>
<td>$ <?php echo get_price($pid)?></td>
<td><input type="text" name="product<?php echo $pid?>" value="<?php echo $q?>" maxlength="3" size="2" /></td>
<td>$ <?php echo get_price($pid)*$q?></td>
<td><a href="javascript:del(<?php echo $pid?>)">Remove</a></td></tr>
<?php
}
?>
<tr><td><b>Order Total: $<?php echo get_order_total()?></b></td><td colspan="5" align="right"><input type="button" value="Clear Cart" onclick="clear_cart()"><input type="button" value="Update Cart" onclick="update_cart()"><input type="button" value="Place Order" onclick="window.location='billing.php'"></td></tr>
<?php
}
else{
echo "<tr bgColor='#FFFFFF'><td>There are no items in your shopping cart!</td>";
}
?>
</table>
</div>
</form>
</body>
</html>