javascript within php loop - php

Question

Is it possible to run javascript code within a php loop?
the javascript works perfect the problem is that it is currently not executing more than once.
while(...) {
$l=$l+1;
$linha="#x".$l;
$linha2="x".$l;
?>
<script type="text/javascript">
$(document).ready(function () {
var mensagem = "<?= $mensagem ?>";
var id= "<?= $linha ?>";
var nextMsgOptions = {
msg: mensagem,
side: "bottomMiddle",
CSSClass: "nextMsg-LightTheme",}
$(id).click(function(){
$(id).nextMsg(nextMsgOptions);
});
});
</script>
}
any ideas? ;)

Answer 1

Yes you can output javascript within a PHP loop, to be executed by the browser, when the page loads.
The problem here is that you've got tons of variables colliding. You need to encapsulate each output of that script tag in order to keep that from happening. Here's one suggestion:
<script type="text/javascript">
<?php while(...): $l++; $linha = "#x" . $l; $linha2 = "x" . $l; ?>
(function($)
{
var mensagem = "<?= $mensagem; ?>",
id = "<?= $linha; ?>",
nextMsgOptions = {
msg: mensagem,
side: "bottomMiddle",
CSSClass: "nextMsg-LightTheme"
};
$(document).ready(function() {
$(id).click(function(){
$(id).nextMsg(nextMsgOptions);
});
});
})(jQuery);
<? endwhile; ?>
</script>
This keeps each $linha and $mensagem variable scoped away from each other for each iteration of the loop. What I think is/was happening is in your old code, you'd set $linha to some variable, and output id = <?= $linha; ?> however many times your loop executed. When $(document).ready() executed for each output, $linha had already been interpreted to be the last value that you loop output. This caused document.ready to attach an event N times (N = number of iterations of your while loop) to the same DOM element (whichever the last iteration of your while loop output $linha to be). With the above snippet, it keeps each id and $linha variable scoped away and private from each other, so you shouldn't have to worry about collisions.
I realize that explanation is kind of convoluted and might be hard to grok; but javascript interpretation/execution/scoping has special rules that aren't incredibly simple to convey without examples.

Answer 2

Yes you can:
<? while(...) { ?>
<script type="javascript">
// Here is you're js code
</script>
<? } ?>
it's be very hard to add in each container php tags.