JS and form help

[ruddernz]

Hi there, I have a form in php where the user puts in a dienumber, number of peices,and the length of each cut. I need then to look up the weight of the die in a db then multiple that by the number of peices multiple the length, then output the answer in the kgs field, is this possible? Figured i would need the onChange and thus js. But my php is better than my js :S So far have this, think im nearly there(maybe?)
Thanks

echo '<script language="javascript">';
echo 'function Getweight(){';
echo 'peices = document.inputs.pieces.value;';
echo 'cutlength = document.inputs.cutlength.value;';
//need to look up weight of die
//need to output back to doc.inputs.kgs

echo '}';
echo '</script>';

echo '<FORM action="../update/updateOrdering.php" method="get" name="inputs">';
echo '<TD class="value"><INPUT type="text" name="dienumber" value="" maxlength="10" size="20"></TD>';
echo '<TD class="value"><INPUT type="text" name="pieces" value="2" maxlength="10" size="20"></TD>';
echo '<TD class="value"><INPUT type="text" name="cutlength" value="1" maxlength="10" size="20" onChange="Getweight()"></TD>';
echo '<TD class="value"><INPUT type="text" name="kgs" value="" maxlength="10" size="20"></TD>';
.....

select dieweight from die_tab where dienumb = 1234

[Javizy]

[!--quoteo(post=346203:date=Feb 16 2006, 12:09 AM:name=ruddernz)--][div class=\'quotetop\']QUOTE(ruddernz @ Feb 16 2006, 12:09 AM) [snapback]346203[/snapback][/div][div class=\'quotemain\'][!--quotec--]
Hi there, I have a form in php where the user puts in a dienumber, number of peices,and the length of each cut. I need then to look up the weight of the die in a db then multiple that by the number of peices multiple the length, then output the answer in the kgs field, is this possible? Figured i would need the onChange and thus js. But my php is better than my js :S So far have this, think im nearly there(maybe?)
Thanks

echo '<script language="javascript">';
echo 'function Getweight(){';
echo 'peices = document.inputs.pieces.value;';
echo 'cutlength = document.inputs.cutlength.value;';
//need to look up weight of die
//need to output back to doc.inputs.kgs

echo '}';
echo '</script>';

echo '<FORM action="../update/updateOrdering.php" method="get" name="inputs">';
echo '<TD class="value"><INPUT type="text" name="dienumber" value="" maxlength="10" size="20"></TD>';
echo '<TD class="value"><INPUT type="text" name="pieces" value="2" maxlength="10" size="20"></TD>';
echo '<TD class="value"><INPUT type="text" name="cutlength" value="1" maxlength="10" size="20" onChange="Getweight()"></TD>';
echo '<TD class="value"><INPUT type="text" name="kgs" value="" maxlength="10" size="20"></TD>';
.....

select dieweight from die_tab where dienumb = 1234
[/quote]

I'm a little confused by your post. If you're asking if you can send requests to a database with JS I'm afraid you can't.

Can't you submit the form, and then process the fields with PHP using $_GET['pieces'], etc, query the DB, make the calculations and then display a message to the user?

You don't really want js to take care of any essential functions because of the varying support and fact that some people disable it. When it comes to forms you're best to use JS for validation, but even then you have to double check on the server-side.