onkeypress

joyce posted this at 04:51 — 8th August 2002.

Joined: Nov 2001

hi, i'm doing a shopping cart where by when user add a product in cart, it will show the qty, item name, and price.

i want to use javascript to do it in a way tat when i change the qty, the price will change also.

for eg, i type 2 in the text field of the qty, then my price will change to original price * 3.

i keep getting error with the javacript below. hope can get help here.

this is the javascript:

&lt;script language="JavaScript"&gt;
<!--
function changevalue()
{	

orivalue = document.form.our_price.value;
qtyvalue = document.form.qty.value;
	
newvalue = orivalue * qtyvalue;
document.form.amount.value = newvalue;
	
//-->
}
&lt;/script&gt;

and my text fields are like below..(part of my codes)

<?php
echo \"<form method=post action=user_cart.php name=form>\";
echo \"<input type=hidden name=our_price value=$our_price>\n\";
echo \"<tr><td width=5% align=center><input type=text name=qty value=\\"$qty\\" size=2 class=ft1 onKeyPress=\\"changevalue()\\"></td>\";
echo \"<td width=15% align=center><input type=text name=amount value=\\"$amount\\" class=ft1></td>\";
?>

pls help me...thanks.

ROB posted this at 16:43 — 9th August 2002.

They have: 447 posts

Joined: Oct 1999

what does the javascript error say?

Abhishek Reddy posted this at 07:48 — 10th August 2002.

He has: 3,348 posts

Joined: Jul 2001

Yes, that would help.

Could you also show us the code as it is the output, not the PHP?

Make that the full code from to .

For now, I'm guessing that "form" is an illegal name for a form.

[edit]
Try this:

document.forms.form...

Still, I think you should rename your form to something else.
[/edit]