Optionnal charges

Hi
I would like to have an optionnal charges with radio button "yes" & "no"
so i apply on the Ecart Merchandissing Rule the condition "Based on session variable value" and i've done on the cart page :

the session is
<?php
if (!session_id()) session_start();
if(!isset($_SESSION["choix"])) {
$_SESSION["choix"] = "".((isset($_POST["choix"]))?$_POST["choix"]:"") ."";
}
?>
the radio button :
oui : <input type="radio" name="choix" value="1" checked/><br>
non : <input type="radio" name="choix" value="0" />

the function call :
function WAEC_PIERROT_Assurance() {
$totalTax = 0;
if (true && (((isset($_SESSION['choix'])?$_SESSION['choix']:"") == "1"))) {
$totalTax += ($this->TotalColumn("TotalPrice") * 0.0285);//Result
}
return WA_eCart_FormatNumber($totalTax, $this->ForceDecimalsC, $this->DecimalPlacesC);
}

but it doesn't work : no caluculation apply
Do you have an idea ?

The trigger for the set session value is wrong.

It is set to " if session does not exist " which means it is created as zero the first time someone visits the page and is not updated.

Instead use the lightning bolt and trigger off of the radio button itself. It will look like:

<?php
if (!session_id()) session_start();
if(((isset($_POST["choix"]))?$_POST["choix"]:"") != "") {
$_SESSION["choix"] = "".((isset($_POST["choix"]))?$_POST["choix"]:"") ."";
}
?>

sorry doen'st work,

do i've to do something to post the raio button value ?

No it should work.

Add some debug code:

<?php
if (!session_id()) session_start();
if(!isset($_SESSION["choix"])) {
die("Session set to: " . $_POST["choix"]);
$_SESSION["choix"] = "".((isset($_POST["choix"]))?$_POST["choix"]:"") ."";
}
?>

Is your form method="post"... do you have this page specified as the form action?

my apologies,

i've made a mistake, the optional taxe rule is ok, but now i've an over problem
when i clic to valid the cart it says :
________________________________

Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/xxxxxxxxxxxxxxxxxx/line xx
________________________________

this line correspond of :
<?php
// WA eCart Redirect
if ($PIERROT->redirStr != "") {
header("Location: ".$PIERROT->redirStr);
}
?>

for the form the code is :
_________________________________
<form action="<?php echo ($_SERVER["PHP_SELF"].(isset($_SERVER["QUERY_STRING"])?"?".htmlentities($_SERVER["QUERY_STRING"]):""));?>" method="post" >
_________________________________

??????????????

This usually means you have a blank line of code, or content before the redirect.

So the page: by (output started at /var/www/vhosts/xxxxxxxxxxxxxxxxxx/line xx

that is where the line of code you referenced. This error should reference two lines of code. The code where the error occurred, and the line where the output started. Usually the correction is made in the line where the output started... if you send both lines then I could suggest which to update and to what.

Thank you Ray, it's ok

I switched two lines so that it works

Best regards