How can i get javascript variable before submitting the form

[kensin]

<script language="javascript">
function fill_name(TempRow) {
var jsRow = <?php echo count($arrNumData[XXX]); ?>
.........
.....
}
</script>
.............
......
<?php
echo "<SELECT name=\"menu_grp_".$num_rows."\" onChange=\"fill_name(".$num_rows.")\">";
?>

the "XXX" that I need is the js variable -- TempRow
Can anyone help me to get it??

[kensin]

Can anyone one help?
please.....i want to know ......thx all

[rharter]

i don't think you can - PHP is a server-side scripting language. that means it executes on the server, not the client. So PHP cannot do client-side work for you ... maybe I misunderstand what you are asking, but ...

[kensin]

O...i am the beginner in php...
really thx a lot.....
Do you mean that submit the form first is the only method?
Actually, I want to make about 18 sets of dynamic dropdown. I also need to know how I can use js array to hold the php array......
Therefore, if I don't know which set the users choose, I can do nothing.
Can anyone advice me how I can do??

[MrAlaska]

PHP writes javascript, but javascript cannot write PHP. If you want a dynamic form, you will need to instruct PHP to provide ALL the variables and load them on the client via javascript, then have javascript build and submit the form when the client makes his final choice. PHP can then accept the submitted form and parse it accordingly.

Of course, clients with javascript disabled will not be able to view it and something that complex is bound to run into version conflicts on some browsers.

[kensin]

thx a lot....coz of your advice, i did what I need....
very thanks ⁰

[marconi8]

you want get the variable from javascript to php before form submiting ????

<script language=javascript>

.....some functions

var tophp='kkkkkkkkkk';
document.form_name.value_collector.value=tophp;

</script>

<form name='form_name' action='ttt.php3' method='post'>
<input type=hidden name='value_collector'>
<input type=submit>
</form>

</form>

[kensin]

actually, i want to get some variables(num:1,2,3....) by javascript to identify which rows in html the user modified. Then, using that kind of variable to get data from php array (ex. array_1, array2...). It is because I want to make dynamic dropdown menu by this way........