very stupid question about PayPal buttons...

[taya]

Hello, my dear forum.

I wanted to put paypal button on my travel site
so customers would be able to pre-pay for their tours.

the code for the button I've got at the PayPal page is:

<form name="_xclick" action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="[e-mail]">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="item_name" value="T-Shirt">
<input type="hidden" name="amount" value="10.00">
<table>
  <tr>
    <td>
    <input type="hidden" name="on0" value="Size">Size</td>
    <td>
    <select name="os0">
    <option value="Select a Size">Select a Size
    <option value="Small">Small
    <option value="Medium">Medium
    <option value="Large">Large
    </select></td>
  </tr>
  <tr>
    <td>
    <input type="hidden" name="on1" value="Color" maxlength="200">Color</td>
    <td>
    <input type="text" name="os1"></td>
  </tr>
</table>
<input type="image" 
src="http://www.paypal.com/en_US/i/btn/x-click-but01.gif" 
border="0" name="submit"
 alt="Make payments with PayPal - it's fast, free and secure!">
</form> 

You can find it at

[url]http://www.paypal.com/cgi-bin/webscr?
cmd=_pdn_xclick_options_help_outside[/URL]

So My idea was to let a visitor to type in the number of the days
in the text window,
but
how can i paypal publish the calculated amount?
let's say deposit will be $50 per day,
the customer types in he wants to spend 3 days there,
so how can i make it show up in the paypal cart $150?

I'm very sleepy now, and probably sound stupid,

so forgive me and if you can, help, please!

[kevinc]

I'm not entirely sure as to what you're trying to do, but I'm assuming that you don't want it to post, for example, "3 nights" rather the equivalent of the multiplication of the entered value by a set amount per value. 3 nights @ $50, post $150.

To do this, you could use JavaScript.

It would look something like this:
[Note, I don't know how Paypal works, I stay in South Africa and they haven't realised that people actually live here, AND use the Internet as of yet, so I'm assuming that the hidden form field for the amount is called "amount", and your form variable for the length of stay is called "days_staying_there"]

<script language="JavaScript">
function calculate_total() {
var cost_per_night = 50;
document.mainform.amount.value = cost_per_night * days_staying_there;
}
</script>

<form name="mainform" method="POST" action="paypal.whatever" onSubmit="calculate_total();">
<input type="hidden" name="amount" value="0">
</FORM>

My JavaScript syntax might be a bit erroneous, I did this in a hurry.

Hope this helps you though.

Regards,
Kevin