I need navigation help!

raisinlove

Hello,
I'm currently converting my online comic into a full php site generated by a template.
I have a basic template which contains the layout html and a php tag for the content (the various content files are defined via the URL).
One of my content files is a sub-template containing the following code:

img src="images/comic/<?php print($num); ?>.jpg" width="400" height="630" alt="" border="0"><br><br>

<a href="zcfh.php?id=page&num=<?php print($num); ?>" class="t">previous</a>
 
<a href="zcfh.php?id=page&num=<?php print($num); ?>" class="t">next</a>

What's missing here is the code in the next and previous buttons that will add or substract from the value $num. Upon first entering the comic section, the page is:
"zcfh.php?id=page&num=1"

What do I need to add in the php tags contained in the URLs? Or is there some better way to do this?

Thank you!

Anon

You have to forgive me (and all others readin), as I'm still new to this PHP. But...

I think you could do something "like" below. Fiddle around with it. Im sure there are more ways to do it...

<?
if (isset($num)) {
$num_less = $num - 1;
$num_more = $num + 1;
}
?>

<a href="zcfh.php?id=page&num=<?php print($num_less); ?>" class="t">PREVIOUS</a>

<a href="zcfh.php?id=page&num=<?php print($num_more); ?>" class="t">NEXT</a>

</codeideas>

// JAM

raisinlove

Excellent, it works perfectly 🙂
Exept now I just realized that it keeps going past my last page. For my present purposes, defining the limit woudl be fine (but I imagine there would be a way that detects if the next file exists?)

Also, going backwards from the first page will yield negative numbers, so my above file checking idea might be necessairy afterall. Can it be done with a PHP function?

thanks

Anon

again... i'm still a newbie... =)

try something like:

<?
if (isset($num)) {
$num_less = $num - 1;
$num_more = $num + 1;
if ($num_less < 1) { $num_less = 1 }
if ($num_more > 20) { $num_more = 1 }
}
?>

...would allways get page number 1 viewed. Maybe not exactly what you want tho.

raisinlove

Well I'll simply set the maximum to keep returning the last page, thus:

if ($num_more > 32) { $num_more = 32 }

But unfortunately, the code doesn't work. I keep getting an error at that line one way or another. Would you know what might be the problem?

Thanks!

Anon

try:

if ($num_more > 32) { $num_more = 32; }

...with the ; ending the variable setting...