我有一个 php 页面,我可以从中减去两个值,其中一个是从 mysql 数据库中获取的,另一个是由用户自己输入的。我真正想要的是在第二个输入字段中输入值时,应该从从数据库调用的第一个输入值中减去输入的值,并且减去的值应该在另一个输入中可见......代码是......
<html>
<head>
<style>
td {font-size:13px;}
</style>
<script src="jquery-1.8.3.js"></script>
<script type="text/javascript">
$(function(){
$('input').each(function() {
$(this).keyup(function(){
calculatedis($(this));
});
});
});
function calculatedis(src) {
var sub = 0;
var sumtable = src.closest('.sumtable');
sumtable.find('input').each(function() {
var amt1 = $('input[name="amt1"]').val();
var amt2 = $('input[name="amt2"]').val();
sub = (amt1 - amt2)
});
sumtable.find(".netAmt").val(sub.toFixed(2));
}
</script>
</head>
<body>
<form class="inward">
<?php
include("dbconnection.php");
$sql = "SELECT id,price FROM table1 WHERE id='3' ORDER BY id";
$res = mysql_query($sql) or die(mysql_error());
echo "<table border='1' align='center' cellspacing='0' cellpadding='3' class='sumtable'>";
echo "<tr bgcolor='#CCCCCC' height='30'>";
echo "<td>Price</td>";
echo "<td>Discounted Amt</td>";
echo "<td>Net Amt</td>";
echo "</tr>";
while($row2=mysql_fetch_array($sql2))
{
//change row color alternately
$i++;
$color = ($i%2) ? "#f8f8ff" : "#f0fff0";
echo "<tr bgcolor=" . $color . " onmouseover='ChangeBackgroundColor(this)' onmouseout='RestoreBackgroundColor(this)'>
$price = $row2["price"];
if (strlen(trim($price)) == 0)
{
echo "<td> </td>";
}
else
{
echo "<td valign='top'><input name='amt1' value=" . $price . " size='5'/></td>";
}
echo "<td valign='top' ><input name='amt2' size='5'/></td>";
echo "<td valign='top'><input name='netamt' class='netAmt' size='5'/></td>";
echo "</tr>";
}
echo "</table>";
echo "<br>";
echo "<tr><td></td></tr>";
echo "<center>";
echo "<input type='submit' name='submit' value='Save' style='cursor:pointer;cursor:hand;'> ";
echo "<input type='reset' name='clear' value='Clear' style='cursor:pointer;cursor:hand;'>";
echo "</center>";
?>
</form>
</body>
</html>
不知道这有什么问题,任何形式的帮助将不胜感激............
除此之外......我可以在循环结束时得到这些减去值的总和,比如 Total 是: