Question

我希望在提交表单后将数据保存在表单的文本框中。我只在第一个文本框中测试函数“VALUE =”“”，但是当我填写文本框并提交表单时，文本框中会出现一个通知错误，上面写着“
注意：未定义的变量： /web/stud/u0867587/MOBILEPHP/exam_interface.php 中 13 <“的会话ID。当我在网上看到如何正确地做到这一点时，所有州都按照我的方式去做。那么为什么它不起作用，请你帮我解决这个问题。

以下是代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>

<title>Exam Interface</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>

<p><strong>NOTE: </strong>If a search box is left blank, then the form will search for all data under that specific field</p>

<form action="exam_interface.php" method="post" name="sessionform">        <!-- This will post the form to its own page"-->
<p>Session ID: <input type="text" name="sessionid" value="<?PHP print $sessionid ; ?>" /></p>      <!-- Enter Session Id here-->
<p>Module Number: <input type="text" name="moduleid" /></p>      <!-- Enter Module Id here-->
<p>Teacher Username: <input type="text" name="teacherid" /></p>      <!-- Enter Teacher here-->
<p>Student Username: <input type="text" name="studentid" /></p>      <!-- Enter User Id here-->
<p>Grade: <input type="text" name="grade" /></p>      <!-- Enter Grade here-->
<p>Order Results By: <select name="order">
<option value="ordersessionid">Session ID</option>
<option value="ordermoduleid">Module Number</option>
<option value="orderteacherid">Teacher Username</option>
<option value="orderstudentid">Student Username</option>
<option value="ordergrade">Grade</option>
</select>
<p><input type="submit" value="Submit" name="submit" /></p>
</form>

<?php

$username="xxx";
$password="xxx";
$database="mobile_app";

mysql_connect('localhost',$username,$password);

@mysql_select_db($database) or die("Unable to select database");

if(isset($_POST['submit'])) {

$sessionid = isset ($_POST['sessionid']) ? $_POST['sessionid'] : "";
$moduleid = isset ($_POST['moduleid']) ? $_POST['moduleid'] : "";
$teacherid = isset ($_POST['teacherid']) ? $_POST['teacherid'] : "";
$studentid = isset ($_POST['studentid']) ? $_POST['studentid'] : "";
$grade = isset ($_POST['grade']) ? $_POST['grade'] : "";
$orderfield = isset ($_POST['order']) ? $_POST['order'] : "";

$sessionid = mysql_real_escape_string($sessionid);
$moduleid = mysql_real_escape_string($moduleid);
$teacherid = mysql_real_escape_string($teacherid);
$studentid = mysql_real_escape_string($studentid);
$grade = mysql_real_escape_string($grade);

 ?>

</body>
</html>

请帮助，谢谢。

Answer 1

您正在使用$sessionid 重新审核之前。把你的PHP指令放在html部分之前。

Answer 2

将您的PHP代码放在HTML文件之前，并将字段的值设置为在发布时捕获它的变量。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>Exam Interface</title>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    </head>
    <body>

        <?php
            $username="xxx";
            $password="xxx";
            $database="mobile_app";

            mysql_connect('localhost',$username,$password);

            @mysql_select_db($database) or die("Unable to select database");

            if(isset($_POST['submit'])) {
                $sessionid = isset ($_POST['sessionid']) ? $_POST['sessionid'] : "";
                $moduleid = isset ($_POST['moduleid']) ? $_POST['moduleid'] : "";
                $teacherid = isset ($_POST['teacherid']) ? $_POST['teacherid'] : "";
                $studentid = isset ($_POST['studentid']) ? $_POST['studentid'] : "";
                $grade = isset ($_POST['grade']) ? $_POST['grade'] : "";
                $orderfield = isset ($_POST['order']) ? $_POST['order'] : "";

                $sessionid = mysql_real_escape_string($sessionid);
                $moduleid = mysql_real_escape_string($moduleid);
                $teacherid = mysql_real_escape_string($teacherid);
                $studentid = mysql_real_escape_string($studentid);
                $grade = mysql_real_escape_string($grade);
            }
        ?>
        <p><strong>NOTE: </strong>If a search box is left blank, then the form will search for all data under that specific field</p>

        <form action="test.php" method="post" name="sessionform">        <!-- This will post the form to its own page"-->
            <p>Session ID: <input type="text" name="sessionid" value="<?PHP print $sessionid ; ?>" /></p>      <!-- Enter Session Id here-->
            <p>Module Number: <input type="text" name="moduleid" value="<?PHP print $moduleid ; ?>" /></p>      <!-- Enter Module Id here-->
            <p>Teacher Username: <input type="text" name="teacherid" value="<?PHP print $teacherid ; ?>" /></p>      <!-- Enter Teacher here-->
            <p>Student Username: <input type="text" name="studentid" value="<?PHP print $studentid ; ?>" /></p>      <!-- Enter User Id here-->
            <p>Grade: <input type="text" name="grade" value="<?PHP print $grade ; ?>" /></p>      <!-- Enter Grade here-->
            <p>Order Results By: <select name="order">
            <option value="ordersessionid" <?php if ($orderfield == "ordersessionid") echo 'selected="selected" '; ?>>Session ID</option>
            <option value="ordermoduleid"> <?php if ($orderfield == "ordermoduleid") echo 'selected="selected" '; ?>Module Number</option>
            <option value="orderteacherid" <?php if ($orderfield == "orderteacherid") echo 'selected="selected" '; ?>>Teacher Username</option>
            <option value="orderstudentid" <?php if ($orderfield == "orderstudentid") echo 'selected="selected" '; ?>>Student Username</option>
            <option value="ordergrade" <?php if ($orderfield == "ordergrade") echo 'selected="selected" '; ?>>Grade</option>
            </select>
            <p><input type="submit" value="Submit" name="submit" /></p>
        </form>

    </body>
</html>

在php中提交表单后如何保存在文本框中输入的数据？

2 个答案: