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Posted by pnberry on 11/11/07 21:56
Hello,
I'm creating a form for data entry. Specifically, data entry via a
digital scale for a POS like system (using a serial interface or using
manual entry via a keyboard which is all I am doing now - I'll worry
about the scale once I get this problem sorted out...).
Anyway there is a quantity (weight in pounds) field, a tare weight
field, a price per pound field and a total charges field. I type in
values to the quantity and tare weight fields and there is a default
price per pound rate. When I press the submit ("Update") button the
total charges field displays the price per pound *(quantity - tare
weight) . All this is simple enough and it works BUT it takes TWO
clicks of the submit button to display any changes in the total
charges field when I change either the quantity or tare weights. What
am I missing or mis-understanding here? How would I make it so all it
takes is one click of the submit ("Update") button to display the
correct amount in the amount_due field?
Hope this makes sense. Thanks for any help or input, I really
appreciate it.
Paul
Here's my form code:
<?php
session_start();
include ("../settings.php");
$db = mysql_connect("$server", "$username", "$password");
mysql_select_db("$database",$db);
print '<html>';
print '<body>';
#Sticky data
#Custom Date
if (!isset($_SESSION['custom_date'])) {
$_SESSION['custom_date'] = date('Y-m-d');
}
#Recycle values
if (!isset($_SESSION['recy_quantity'])) {
$_SESSION['recy_quantity'] = 0;
}
$_SESSION['recy_quantity'] = $_GET['recy_quantity'];
if (!isset($_SESSION['recy_tare'])) {
$_SESSION['recy_tare'] = 0;
}
$_SESSION['recy_tare'] = $_GET['recy_tare'];
#Trash values
if (!isset($_SESSION['trsh_quantity'])) {
$_SESSION['trsh_quantity'] = 0;
}
$_SESSION['trsh_quantity'] = $_GET['trsh_quantity'];
if (!isset($_SESSION['trsh_tare'])) {
$_SESSION['trsh_tare'] = 0;
}
$_SESSION['trsh_tare'] = $_GET['trsh_tare'];
#Main entry form body
print "<form action=\"$_SERVER[PHP_SELF]\" method=\"GET\" name=
\"transaction_form\">";
print '<table align=center bgcolor="#CDCDCDCD">';
print '<caption valign=top align=center><h3>Transaction Form</h3></
caption>';
#Date information
print '<tr>';
print '<td></td>';
print '<th rowspan=2>Date  </th>';
print '<td align=left><input type=radio name=date checked="checked"
value="now" align=left> Now</td><th>YYYY-MM-DD</th>';
print '</tr>';
print '<tr>';
print '<td></td>';
print '<td><input type=radio name=date value="custom"> Custom</td>';
print "<td><input type=text name=\"custom_date\" size=10 value=
\"$_SESSION[custom_date]\"></td>";
print '</tr>';
#Headers for next row
print '<tr><th colspan=7><hr></th></tr>';
print '<tr><th align=center>Item Name</th>';
print '<th align=center>Quantity</th>';
print '<th align=left><img src=../images/spacer.gif width=0 height=0></
th>';
print '<th align=center>Tare Wt</th>';
print '<th align>$ Per Unit</th>';
print '<th align=center>Amount Due</th>';
print '<th align=left><img src=../images/spacer.gif width=0 height=0></
th>';
print '</tr>';
#recyclables row
print '<tr><td>Recyclables - simple rate </td>'; #WHAT, the item
name
print '<td><input type=text name="recy_quantity" size="9" value="' .
$_SESSION['recy_quantity'].'"></td>'; #Quantity field
print '<td><button type=button name=scale>Use Scale</button></td>';
#Scale Button TODO
print '<td align="center"><input type=text name="recy_tare" size="4"
value="' . $_SESSION['recy_tare'].'"></td>'; #Tare weight field
print '<td>$<input type=text size="8" value="0.20" name="recy_price">
</td>'; #Price per pound
print "<td>\$$_SESSION[recy_amount_due]</td>"; #Amount due field
print '<td><button type=submit name=update value=update>Update</td>';
#Update button
print '</tr>';
#trash row
print '<tr><td>Trash </td>'; #WHAT, the item name
print '<td><input type=text name="trsh_quantity" size="9" value="' .
$_SESSION['trsh_quantity'].'"></td>'; #Quantity field
print '<td><button type=button name=scale>Use Scale</button></td>';
#Scale Button TODO
print '<td align="center"><input type=text name="trsh_tare" size="4"
value="' . $_SESSION['trsh_tare'].'"></td>'; #Tare weight field
print '<td>$<input type=text size="8" value="0.15" name="trsh_price">
</td>'; #Price per pound
print "<td>\$$_SESSION[trsh_amount_due]</td>"; #Amount due field
print '<td><button type=submit name=update value=update>Update</td>';
#Update button
print '</tr>';
print '</table>';
print '</form>';
print '</body>';
print '</html>';
#Form processing
if (isset($_GET['recy_quantity'])) {
$_SESSION['recy_amount_due'] =
$_GET['recy_price']*($_GET['recy_quantity'] - $_GET['recy_tare']);
}
if (isset($_GET['trsh_quantity'])) {
$_SESSION['trsh_amount_due'] =
$_GET['trsh_price']*($_GET['trsh_quantity'] - $_GET['trsh_tare']);
}
?>
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