它一直顯示不正確的模塊名稱和編號，如何解決？

Question

下面我有一個PHP腳本，它顯示「課程」下拉菜單和「模塊」下拉菜單。假定發生的事情是用戶首先從「課程」下拉菜單中選擇一門課程，然後屬於所選課程的模塊列表將出現在「模塊」下拉菜單中。下面是該代碼：

create_session.php 



$sql = "SELECT CourseId, CourseNo, CourseName FROM Course"; 

$sqlstmt=$mysqli->prepare($sql); 

$sqlstmt->execute(); 

$sqlstmt->bind_result($dbCourseId, $dbCourseNo, $dbCourseName); 

$courses = array(); // easier if you don't use generic names for data 

$courseHTML = ""; 
$courseHTML .= '<select name="courses" id="coursesDrop">'.PHP_EOL; 
$courseHTML .= '<option value="">Please Select</option>'.PHP_EOL; 

while($sqlstmt->fetch()) 
{ 
    $courseno = $dbCourseNo; 
    $course = $dbCourseId; 
    $coursename = $dbCourseName; 
    $courseHTML .= "<option value='".$course."'>" . $courseno . " - " . $coursename . "</option>".PHP_EOL; 
} 

$courseHTML .= '</select>'; 

?> 


<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post"> 
    <table> 
     <tr> 
      <th>Course: <?php echo $courseHTML; ?> 
       <input id="courseSubmit" type="submit" value="Submit" name="submit" /> 
      </th> 
     </tr> 
    </table> 
</form> 

<?php 

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

    $submittedCourseId = $_POST['courses']; 

    $query = "SELECT cm.CourseId, cm.ModuleId, c.CourseNo, m.ModuleNo, 
      c.CourseName, 
      m.ModuleName 
      FROM Course c 
      INNER JOIN Course_Module cm ON c.CourseId = cm.CourseId 
      JOIN Module m ON cm.ModuleId = m.ModuleId 
      WHERE 
      (c.CourseId = ?) 
      ORDER BY c.CourseName, m.ModuleId"; 

    $qrystmt=$mysqli->prepare($query); 

    // You only need to call bind_param once 
    $qrystmt->bind_param("s",$submittedCourseId); 
    // get result and assign variables (prefix with db) 

    $qrystmt->execute(); 

    $qrystmt->bind_result($dbCourseId,$dbModuleId,$dbCourseNo,$dbModuleNo,$dbCourseName,$dbModuleName); 

    $qrystmt->store_result(); 

    $num = $qrystmt->num_rows(); 

    if($num ==0){ 
     echo "<p style='color: red'>Please Select a Course</p>"; 
    } else { 

     $dataArray = array(); 

     while ($qrystmt->fetch()) { 
      // data array 
      $dataArray[$dbCourseId]['CourseName'] = $dbCourseName; 
      $dataArray[$dbCourseId]['CourseNo'] = $dbCourseNo; 
      $dataArray[$dbCourseId]['Modules'][$dbModuleId]['ModuleName'] = $dbModuleName; 
      $dataArray[$dbCourseId]['Modules'][$dbModuleId]['ModuleNo'] = $dbModuleNo; 

      // session data 
      $_SESSION['idcourse'] = $dbCourseNo; 
      $_SESSION['namecourse'] = $dbCourseName; 
      $_SESSION['idmodule'] = $dbModuleNo; 
      $_SESSION['namemodule'] = $dbModuleName; 

      } 

     foreach ($dataArray as $foundCourse => $courseData) { 

      $output = ""; 

      $output .= "<p><strong>Course:</strong> " . $courseData['CourseNo'] . " - " . $courseData['CourseName'] . "</p>"; 

      $moduleHTML = ""; 
      $moduleHTML .= '<select name="module" id="modulesDrop">'.PHP_EOL; 
      $moduleHTML .= '<option value="">Please Select</option>'.PHP_EOL;  
      foreach ($courseData['Modules'] as $moduleId => $moduleData) {   

       $moduleHTML .= "<option value='$moduleId'>" . $moduleData['ModuleNo'] . " - " . $moduleData['ModuleName'] ."</option>".PHP_EOL;   
      } 
     } 
    $moduleHTML .= '</select>'; 

    echo $output; 

?> 

<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post"> 
    <table> 
     <tr> 
      <th>Course: <?php echo $moduleHTML; ?> 
       <input id="courseSubmit" type="submit" value="Submit" name="submit" /> 
      </th> 
     </tr> 
    </table> 
</form> 

因此，可以說我在接下來的「課程」的課程INFO101 - Information Communication Technology下拉菜單中，它顯示在模塊以下模塊下拉菜單下面對應與課程：

CHI2520 - Advanced Web Programming 
CHI2220 - Systems Strategy 
CHI2350 - Interactive Systems 

現在這是我的問題。如果我選擇模塊CHI2520 - Advanced Web Programming，然後訪問下面的頁面，它將顯示此模塊，而不是CHI2350 - Interactive Systems。

QandATable.php：

<?php 

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

     $_SESSION['idmodule'] = $_POST['idmodule']; 

    } 

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

     $_SESSION['namemodule'] = $_POST['namemodule']; 

    } 

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

$_SESSION['idcourse'] = $_POST['idcourse']; 

} 

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

$_SESSION['namecourse'] = $_POST['namecourse']; 

} 


    $outputDetails = ""; 
    $outputDetails .= " 
    <table id='sessionDetails' border='1'> 
    <tr> 
    <th>Course:</th> 
    <th>{$_SESSION['idcourse']} {$_SESSION['namecourse']}</th> 
    </tr> 
<tr> 
<th>Module:</th> 
<th>{$_SESSION['idmodule']} {$_SESSION['namemodule']}</th> 
</tr> 
    </table> 
    "; 

    echo $outputDetails; 

    ?> 

我的問題是，爲什麼它顯示其他頁面錯誤模塊編號和名稱？這兩個頁面不包括session_start();

下面是形式，導航到QandATable.php：

<form action="QandATable.php" method="post" id="sessionForm"> 
      <table><tr><th>6: Module:</th> 
      <td><?php echo $moduleHTML; ?></td> 
      </tr> 
      </table> 
      <p><input class="questionBtn" type="submit" value="Prepare Questions" name="prequestion" /></p> 


     </form> 

Answer 1

設置選擇自動完成=「關閉」，它應該解決這個問題。瀏覽器的自動完成功能試圖讓用戶知道他們是如何做到的，而不是告訴它做其他事情。它讓我瘋狂。

<select autocomplete="off" name="courses" id="coursesDrop">