实际上我在编程方面还是个新手。只是想问一下这个代码有什么问题?我试图在一个表单内进行计算。如果你们能帮忙，我很感激。谢谢你。

<?php
$script = "
window.addEvent('domready', function() {
function calculate() {
var value1 = $('value1').value;
var value2 = $('value2').value;
var value3 = $('value3').value;
var value4 = $('value4').value;
var value5 = $('value5').value;

var total = ( value1 + value2 + value3 + value4 + value5);

// Check that the result is a finite number. If so, display the results.
if (!isNaN(monthly) &&
  (monthly != Number.POSITIVE_INFINITY) &&
  (monthly != Number.NEGATIVE_INFINITY)) {

  total.value = round(value1 +value2 +value3 +value4 + value5);
} else {
  // Otherwise, the user's input was probably invalid, so don't
  // display anything.
  total.value = '';
}
} 
// rounds number to two decimal places.
function round(x) {
return Math.round(x*100)/100;
}
$('compute').addEvent('click', calculate );
$('value1').addEvent('change', calculate );
$('value2').addEvent('change', calculate );
$('value3').addEvent('change', calculate );
$('value4').addEvent('change', calculate );
$('value5').addEvent('change', calculate );

 });
";
$doc =& JFactory::getDocument();
$doc->addScriptDeclaration($script);
 ?>
<table>
<tr><td colspan="3"><b>Enter Amount Information:</b></td></tr>
<tr>
  <td>1)</td>
  <td>Amount of the 1 :</td>
  <td><input type="text" name="value1" id="value1" size="12" ></td>
 </tr>
<tr>
  <td>2)</td>
  <td>Amount of the 2 :</td>
  <td><input type="text" name="value2" id="value2" size="12" ></td>
</tr>
<tr>
  <td>3)</td>
  <td>Amount of the 3 :</td>
  <td><input type="text" name="value3" id="value3" size="12" ></td>
</tr>
<tr>
  <td>4)</td>
  <td>Amount of the 4 :</td>
  <td><input type="text" name="value4" id="value4" size="12" ></td>
</tr>
<tr>
  <td>5)</td>
  <td>Amount of the 5 :</td>
  <td><input type="text" name="value5" id="value5" size="12" ></td>
</tr>
<tr><td colspan="3">
  <input type="button" value="Compute" id='compute' " >
</td></tr>
<tr><td colspan="3">
  <b>Payment Information:</b>
</td></tr>

<tr>
  <td>5)</td>
  <td>Your total will be:</td>
  <td><input type="text" name="total" id="total" size="12" readonly='readonly'></td>
</tr>
</table>
?>

问候,ADik垫

应该是

 $('#value1').val()

不是

 $('value1').value

如果你正在使用jquery并通过id

选择元素

修复错误

删除代码末尾的?>

<标题> 2。标签闭包错误

更改为此代码

<input type="button" value="Compute" id='compute' />

<标题> 3。而不是使用Window.event('domready')使用

$(document).ready(function() { } );

如果你已经在使用jQuery。

<标题> 4。在中放置一个表总是好的

<body></body>

标记。

这意味着你应该从

开始

<html> 
    <head>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
    </head>
    <body>
        //put some contents like table
    </body>
</html>

<标题> 5。我认为你的javascript代码可以通过使用下面的代码片段来减少。

$(':text').change(function() {
    var sum = 0;
    $(this).each(function() {
        sum += $(this).val();
    });
    $("#total").val(sum);
});

简单的计算php

Simple calculation php

修复错误