Calculate Subtoal onchange

[richm]

Hello,

I have two pages:
- order.html
- results.php

order.html is simply a form with radio button options. Each option is assigned a name and value ($a, $b, $c, etc.)

For example:

Legend:
(*) = radio button selected

( ) = radio button not selected

Base Server:
(*) 1U P3-1Ghz, 256MB (2x128M😎 Server $100 // value=a
( ) 1U P3-1Ghz, 512MB (2x256M😎 Server $200 // value=b
( ) 1U P3-1Ghz, 1GB (2x512M😎 Server $300 // value=c

Add Memory:
(*) Add 256MB (2x128M😎 Server $10 // value=d
( ) Add 512MB (2x256M😎 Server $20 // value=e

( ) Add 1GB (2x512M😎 Server $30 // value=f

results.php does the variable calculation and adds the sum of selected options:

$subtotal = $a+$d

When the user selects his options and presses submit, results.php processes the request and displays the subtotal ($subtotal).

So far so good, everything calculates and displays perfectly on results.php

Now I would like to make it so whenever a user changes a selection, it automagically updates the subtotal on the same page (order.html) with or without pressing the submit button. The process would be similar to the javascript "onchange" funtion.

Can this be done in PHP?

Thanks,

-Rich

[malbera]

it can't
php is server side
so you have to make some javascript function to calculate the subtotal, or change order.html to order.php and, OnChange, reload order.php with some vars passed, so php could calculate the subtotal

hope that helps

[richm]

OK, let's take another approach and stay away from the onchange.

How would I get the user to submit the form selections, perform the calculation, display the total and stay on the same page? This would allow them to stay on the same page, make a new selection and update the page to reflect the new total $$.

Does this make sense?

Thanks,

-Rich

[richm]

Sorry for the redundancy in my previous question... it's getting late.

-Rich