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我在 html 中设置了 2 个文本框和一个下拉选项列表。我正在尝试使用 php 来验证这些文本框是否已填写。如果单击提交按钮（'btnCalculate'），则进行验证，如果文本框中没有任何内容，则会在其旁边弹出错误消息（'pamountErrorMsg，irateErrorMsg'）。如果在文本框中输入了内容，浏览器会将信息保存到 Session["pamount"] 或 "irate" 中。我无法验证空白文本框并将变量添加到 Session 中，然后才能在下一页中使用它们。现在它根本没有验证任何东西。我的语法有什么问题（如果有的话）？

正在考虑只使用 "php?$pamount = $_SESSION["pamount"]; ?>" 来创建我需要读取会话变量的变量，对吗？

PHP

session_start();    // start PHP session! 

header('Cache-Control: no-cache');
header('Pragma: no-cache');

$pamountErrorMsg = "";
$irateErrorMsg = "";

$btnCalculate = $_GET['btnCalculate'];
$irate = $_GET['irate'];
$pamount = $_GET['pamount'];    
    $y2d = $_GET['y2d'];
if(isset($btnCalculate))
{
    if(strlen(trim($pamount)) <= 0)
    {
        $pamountErrorMsg = "Principal Amount cannot be empty";
        $irateErrorMsg = "";
    }
    else if(strlen(trim($irate)) <= 0)
    {
        $irateErrorMsg = "The interest rate cannot be empty";
        $pamountErrorMsg = "";
    }
    else
    {
        $_SESSION["pamount"] = $_GET["pamount"];
        $_SESSION["irate"] = $_GET["irate"];
                    $_SESSION["y2d"] = $_GET["y2d"];
        header("Location: Lab3DisclamerZCL.php");
        exit( );
    }
}
?>

HTML

<form method='get' action="Result.php">
<table>
    <tr>
        <td>
        Principal Amount
        </td>
        <td>
        <input type='text' class='input' name='pamount' size='30' />
        </td>
        <td class='error'>
        <?php echo $pamountErrorMsg; ?>
        </td>
    </tr>
    <tr>
        <td>
        Interest Rate (%)
        </td>
        <td>
        <input type='text' class='input' name='irate' size='30' />
        </td>
        <td class='error'>
        <?php echo $irateErrorMsg; ?>
        </td>
    </tr>
    <tr>
        <td>
        Years to Deposite
        </td>
        <td>
        <select name='y2d' selected='5'>
                <option value='1'>1</option>
                <option value='2'>2</option>
                <option value='3'>3</option>
                <option value='4'>4</option>
                <option value='5' selected='selected'>5</option>
                <option value='6'>6</option>
                <option value='7'>7</option>
                <option value='8'>8</option>
                <option value='9'>9</option>
                <option value='10'>10</option>
        </td>
    </tr>
        <tr>
            <td>&nbsp;</td>
            <td>
                <input type='submit' class='button' name='btnCalculate' value='Calculate'/>&nbsp;&nbsp;
                <input type='reset' class='button' name='btnReset' value='Reset' />

            </td>
        </tr>
</table>
    </form>

我的 Result.php（进行中）

<?php error_reporting(E_ALL); ?>
<?php 
session_start();    // retrieve PHP session! 
header('Cache-Control: no-cache');
header('Pragma: no-cache');
if (!isset($_SESSION["name"]))
{
    header("Location: Calculator.php");
    exit( );
}
        if(!isset($_SESSION["pamount"]))
{
    $pamount = $_SESSION["pamount"];
}
if(!isset($_SESSION["irate"]))
{
    $irate = $_SESSION["irate"];
}
if(!isset($_SESSION["pamount"]))
{
    $y2d = $_SESSION["y2d"];
}
?> 
<html>
<head>
<title>Results</title>
<link rel = "stylesheet" type = "text/css" href = "style.css" />
</head>
<body>
<h3 class="distinct">Thank you <?php echo $_SESSION["name"]?>, for using out deposite calculation tool.</h3>
<p>Following is the results of calculation </p>
<form action='Result.php' method='post'>
<table>
                 <?php


                 $pamount = $_SESSION["pamount"];
                 $irate = $_SESSION["irate"];
                 $y2d = $_SESSION["y2d"];
                $runningPrincipal = $pamount;

                for($i = 1; $i <= $y2d; ++$i)
                {
                    $interest = $runningPrincipal * $irate * 0.01;

                    printf("<tr><td>%s</td><td>\$%.2f</td><td>\$%.2f</td></tr>", $i, $runningPrincipal, $interest);

                    $runningPrincipal += $interest;

                }
                ?>
                </table>
                </form>
<?php session_destroy();?>
</body>
</html>
4

1 回答 1

0

您需要在给出 HTML 表单的同一页面上进行验证，即 Calculator.php。成功验证后，您会将输入的值分配给会话变量，并重定向到 Result.php，您可以在其中进行计算并显示结果。

于 2012-09-23T20:37:02.947 回答