Passing values through javascript to php

Question

I'm creating small shopping-cart program, I'm using following code to input values.

<input type="button" value="Add to Cart : <?php echo $row['PART_NO']; ?>" onclick="addtocart('<?php echo $item; ?>')" />

value goes through following javascript code.

function addtocart(pid){
    alert(pid);
    document.form1.productid.value=pid;
    document.form1.command.value='add';
    document.form1.submit();
}

<body>
<form name="form1">
<input type="hidden" name="productid" />
<input type="hidden" name="command" />
</form>

<?php
if ( isset($_REQUEST['command']) && $_REQUEST['command'] == 'add' &&    $_REQUEST['productid']>0 ){
    $pid=$_REQUEST['productid'];
    addtocart($pid,1);
    header("location:shoppingcart.php");
    exit();
}

?>

when I'm inserting productid like 02190249 it goes through javascript code and php code and loading the shoppingcart.php. but inserting productid like PF161202 its not loading the shoppingcart.php. how can I pass values like PF161202 to php code through js.

You are printing the body before you want to send a header. You need to send the header before you print anything. Put the PHP code above the HTML and JS code. — Charlotte Dunois
– Charlotte Dunois, Commented May 14, 2016 at 17:47
Have you tried the special value alert("I'm in your codez rekking your s***?")? I hear it gives some special results... — Niet the Dark Absol
– Niet the Dark Absol, Commented May 14, 2016 at 17:49
It's beause you checked $_REQUEST['productid']>0 which is working fine with numbers but not for string. you have to remove this check. — Rohìt Jíndal
– Rohìt Jíndal, Commented May 14, 2016 at 17:56

Rohìt Jíndal · Accepted Answer · 2016-05-14 18:00:19Z

1

Remove $_REQUEST['productid']>0 from your php code. It is checking only for numbers(02190249) which is greater then 0 but as per your question you are passing a string(PF161202).

<?php
if ( isset($_REQUEST['command']) && $_REQUEST['command'] == 'add' && ($_REQUEST['productid'] != '')){
    $pid=$_REQUEST['productid'];
    addtocart($pid,1);
    header("location:shoppingcart.php");
    exit();
}
?>

answered May 14, 2016 at 18:00

Rohìt Jíndal

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1 Comment

NuwanD Over a year ago

the code works. but unable to print it using following code, $max=count($_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;

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