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Dynamically changing text box, based on a form input?
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Jimbo
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O.P. RE: Dynamically changing text box, based on a form input?
quote:
Originally posted by krissy-afc
Using PHP?
Using anything really, PHP, Java, I don't mind.

quote:
Originally posted by stoshrocket
php code:
$am = $_POST['amount'];
$ret = ceil($am/0.05);

EDIT:

NB: ceil rounds up to nearest integer value, which I assumed from your post. However, if you needed to round up such that you end up to the nearest pence/cent, you'd have to use round() and an appropriate precision value, along with adding 0.005 to ensure you end up with the correct rounded up value...

php code:
$am = $_POST['amount'];
$ret = round(($am/0.05)+0.005, 2);

EDIT 2:

Thinking about it, dividing an integer with no more than 2 dp by 0.05 (effectively multiplying by 20) will mean there will be at most 1dp, so that last edit can be ignored, but kept for reference :P
Thanks, but wont that $_POST variable only be retrieved after the form is submitted? or am I being stupid?

I'm trying to make it change instantly, as a new value is entered into the amount box, or if that isn't possible, a button or something to update the total.

And also, I am not trying to round the amount entered, but the amount produced. For example, say someone donated $6.23 (unlikely, yes, but it could happen),  that / 0.05 is 124.6. What I would want produced is 125, the nearest whole number. Sorry if I didn't make myself clear.
02-07-2010 11:03 PM
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Messages In This Thread
Dynamically changing text box, based on a form input? - by Jimbo on 02-07-2010 at 09:37 PM
RE: Dynamically changing text box, based on a form input? - by Chrissy on 02-07-2010 at 10:07 PM
RE: Dynamically changing text box, based on a form input? - by stoshrocket on 02-07-2010 at 10:14 PM
RE: Dynamically changing text box, based on a form input? - by Jimbo on 02-07-2010 at 11:03 PM
RE: Dynamically changing text box, based on a form input? - by Spunky on 02-07-2010 at 11:44 PM
RE: Dynamically changing text box, based on a form input? - by Jimbo on 02-08-2010 at 12:15 AM
RE: Dynamically changing text box, based on a form input? - by Spunky on 02-08-2010 at 12:22 AM
RE: Dynamically changing text box, based on a form input? - by stoshrocket on 02-08-2010 at 12:36 AM
RE: Dynamically changing text box, based on a form input? - by Jimbo on 02-08-2010 at 12:37 AM
RE: Dynamically changing text box, based on a form input? - by Spunky on 02-08-2010 at 12:40 AM
RE: Dynamically changing text box, based on a form input? - by Jimbo on 02-08-2010 at 01:08 AM


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