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Languages :: PHP :: How to enlarge thumbnail image by using links (w/o query strings)
By: jwnrb U.S.A.  Date: 25/09/2003 00:00:00  English  Points: 95 Status: Answered
Quality : Excellent
Hi,

Currently, I have two images on my projects page, but I will later add more projects so I want an easy way of doing this task. I dont have imagemagick on my server, just netpbm. though i dont think thats as clever as it can be.

the URI is <A HREF="http://www.jwnrb.com/projects.php">http://www.jwnrb.com/projects.php</a> and the code that does it is as follows:

<?php
if ($_GET[large] != "1"){
echo "<img src=\"downloads/preview_tweak_sm.png\" alt=\"Preview TweakXP\" />";
echo "[<a href=\"projects.php?large=1\">ENLARGE</a>]</a><br />";
}

elseif($_GET[large] == "1"){
echo "<img src=\"downloads/preview_tweak.png\" alt=\"Preview TweakXP\" />";
echo "[<a href=\"projects.php\">SHRINK</a>]</a><br />";
}
?>
By: VGR Date: 25/09/2003 04:27:00 English  Type : Comment
<?php
$isbig=($_GET[large] == "1");
$link=($isbig)?"'>ENLARGE":"?large=1'>SHRINK";
echo "<img src='downloads/preview_tweak".(($isbig)?'':'_sm').".png' alt='Preview TweakXP'>";
echo "[<a href='projects.php$link</a>]<br />";
?>
By: jwnrb Date: 25/09/2003 17:02:00 English  Type : Comment
well that makes the coding of what i did a little prettier, but i dont want to use query strings at all.
i want internal variables that WONT be shown on the URI
By: VGR Date: 25/09/2003 17:29:00 English  Type : Answer
ok

<?php
$isbig=($_GET['large'] == "1"); // NEVER EVER USE ASSOCIATIVE ARRAYS WITHOUT QUOTES !!! See PHP doc !
$link=($isbig)?"":'?large=1';
$thesm=(($isbig)?'':'_sm');
echo <<<EOS
<form name=main action=project.php$link method=POST>
<input type=hidden name=image value=preview_tweak.png><!--just an example-->
<input type=hidden name=isbig value={$_GET['large']}><!--just an other example-->
</form>
<script language=javascript>
function go() {
document.forms.main.submit();
}
</script>
<img src='downloads/preview_tweak$thesm.png' alt='Preview TweakXP'>[<input type=button value="preview" onClick="go();">]<br />
EOS;
?>

happy ? :D
By: jwnrb Date: 25/09/2003 18:03:00 English  Type : Comment
guess i'm happy now ;-)
By: VGR Date: 25/09/2003 18:18:00 English  Type : Comment
then gimme the points ;-)
By: jwnrb Date: 26/09/2003 01:09:00 English  Type : Comment
Ooops thought I did ;-)
By: VGR Date: 26/09/2003 02:50:00 English  Type : Comment
thanks, but beware, things are becoming tricky when you use buttons onClick="some javascript" which has to recover form's data and submit()

it's really spaghetti coding IMHO
By: jwnrb Date: 26/09/2003 03:26:00 English  Type : Comment
actually, i liked your revising of my code better so i think i would use that instead.
i dont like query strings bc the variables are in the URI. when i get more projects i like for enlarging to be done on all screenshots that can be available, plus eventually im going to translate my page in multiple languages as well.

so projects.php?lang=en&proj=3 might be a tad annoying. though i can have a sysnopsis on the top, and i can only make a seperate one as well later on. hmm..... and maybe sessions/or cookies so i can have multiple enlarged at the same time.

sorry for rambling, it gets my ideas out so i can remember them later ;-)

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