[PHP] Re: recursion?????
Alex,
as a general rule of thumb, try to do as much checking as you can with
JavaScript. For those checks such as "is the field a valid date", "is
the field numeric" and so on, it is much faster to check on the client,
than to send the data back to the server and check it there. Probably
the best way to do this is with an "onSubmit" clause on the .
Something like:
Some things you cannot check on the client, for example does the value
of the field already exist in a data store on the server. There are
many ways in which you could check these fields. On of the easiest to
understand ways would be to name your submit field something like
"Register", and use code something like the following in register.php:
switch ($_POST['submit']) {
case "a";
processA();
break;
case "b";
processB();
break;
case "Register";
checkFormAndRedisplay();
break;
default;
processDefault();
break;
}
In the procedure checkFormAndRedisplay(), you can write code to check
your fields, and the relationships between them, and then redisplay the
form with appropriate error messages, and highlighting, to guide the end
user to correct his errors.
Hope this helps. . . Fred
Alex Davis wrote:
Ok ... here is the sitituation... I am creating a registration form.
What I have so far works ... the user registers using this form and the
form calls another page that will check the validity of the data
(checking for username availability, etc...). If there is an error,
display the error and have the user GO BACK AND TRY AGAIN <- This is
the problem I want to fix.
What I want to do is have the registration form, on submit, check the
data validity right then, if there is an error, redisplay the form with
an * next to the field that is incorrect. This way the user does not
have to go back and try again, it will be there in front of them.
Basically, have the form action call itself hince the recursion.
Any suggestion/examples?
Thanks,
-Alex
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[PHP] Re: Recursion?????
Alex, and Michael, here is a code fragment which I have cut and simplified from one of my working scripts, that does some simple javascript checking of a form. It should give you an idea of how to do it. There is a lot of documentation, and examples of javascript on the web. Try a google search. At this level it is relatively easy(well at least it is after you have done it once). When you get into more complicated javascripts, you have to take into account that because of different document object models, some things are implemented differently in different browsers. . . . ?>
. . . The key thing to notice here, is that the submit will only happen if the onSubmit returns true. Hope this helps. . . Fred Michael Eacott wrote: Alex Like you I have php scripts that validate the contents of registration and other forms. I'm new to php and do not have a clue about client side (java) scripting. Yes and the GO BACK AND TRY AGAIN process is what my php scripts do. All very messy. I'll have to learn javascript but currently I have a deadline to meet with the php implementation.Be interested to see sometime in the future the javascripts you write to validate you forms. Regards Mike Eacott rentAweek Ltd http://www.rentaweek.org -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Re: recursion?????
David, of course. You always should check in the server, even if javascript is working. You have to protect your data integrity. Sorry I did not make this clear. The benefit of checking in javascript(which I suspect is enabled in most browsers these days), is that the client gets an instant response for the out of line situation. Best regards. . . Fred David Freeman wrote: > as a general rule of thumb, try to do as much > checking as you can with > JavaScript. For those checks such as "is the field a valid > date", "is > the field numeric" and so on, it is much faster to check on > the client, > than to send the data back to the server and check it there. Except, of course, that you need to check it AGAIN in your php script in case the browser has javascript disabled - because if it's disabled you'll end up with unchecked form data. CYA, Dave -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: date calculation
Qt, The easiest way is to convert your dates into a serial day number(i.e. the number of days that have elapsed between your date, and some arbitrary date in the dim and distant past - I think PHP uses 25th November, -4714). There are some calendar functions in php that will do this for you. Once you have your dates as a numeric offset, you can subtract them to get a the number of days between the dates, or you can add or subtract a number of days to get a new offset. Once you have the new offset, there are reverse calendar functions in php, to convert your new offset back to a calendar date. Check out the functions GregorianToJD(), and JDToGregorian(), in the Calendar functions of the PHP manual. If you do not have access to the calendar functions in your version of php, there are also a couple of examples how to do one of the conversions written in PHP, in the user contributed notes of the manual. There are also many published articles describing algorithms on how to do this. I can remember implementing these functions in 1977(Not in PHP of course), from an article published in the journal of the ACM, in 1963. Hope this helps. . . Fred Qt wrote: Dear Sirs, How can I add or subtract two date easily. Is therea any lib or function about this. I can not find any easy way in the manual Best Regards -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
