Question

在我的主应用程序中，我希望显示以下布局：

当应用程序打开时，它将显示“课程”文本输入和提交课程的提交按钮。（这很好用）
当用户进入课程并提交时，如果成功，则会在回显中显示下方课程的名称和ID，并且在回声下方应显示“模块”下拉菜单并提交按钮提交模块。（这很好）
当用户提交模块时，应执行以下操作：

应该保留课程名称的回声（此时用户提交模块

提交模块后，模块下拉菜单应保留在页面上（此时此消失

从下拉菜单提交模块时，如何才能获得上述要点。

<?php

     // connect to the database
 include('connect.php');

 /* check connection */
 if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
die();
}

 $courseid = (isset($_POST['courseid'])) ? $_POST['courseid'] : '';

?>

   <h1>DELETING AN ASSESSMENT</h1>

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


    <?php
  if (isset($_POST['submit'])) {

    $query = "
             SELECT cm.CourseId, cm.ModuleId, 
             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
$qrystmt->bind_param("s",$courseid);
// get result and assign variables (prefix with db)

$qrystmt->execute(); 

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

 $qrystmt->store_result();

$num = $qrystmt->num_rows();

if($num ==0){
    echo "<p>Sorry, No Course was found with this Course ID '$courseid'</p>";
} else { 

    $dataArray = array();

 while ( $qrystmt->fetch() ) { 
      // data array
      $dataArray[$dbCourseId]['CourseName'] = $dbCourseName; 
      $dataArray[$dbCourseId]['Modules'][$dbModuleId]['ModuleName'] = $dbModuleName; 
       // session data
      $_SESSION['idcourse'] = $dbCourseId;
      $_SESSION['namecourse'] = $dbCourseName;

}

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

      $output = ""; 

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

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

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

  echo $output;


    ?>

     <form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
     <p>Module: <?php echo $moduleHTML; ?><input id="moduleSubmit" type="submit" value="Submit" name="modulesubmit" /></p>      
    </form> 



    <?php
}
}

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

 var_dump($_POST['modulesDrop']);

        $sessionquery = "
             SELECT SessionId, SessionDate, SessionTime, ModuleId
             FROM Session
             WHERE
             (ModuleId = ?)
             ORDER BY SessionDate, SessionTime 
            ";

$sessionqrystmt=$mysqli->prepare($sessionquery);
// You only need to call bind_param once
$sessionqrystmt->bind_param("s",$_POST['modulesDrop']);
// get result and assign variables (prefix with db)

$sessionqrystmt->execute(); 

$sessionqrystmt->bind_result($dbSessionId,$dbSessionDate,$dbSessionTime, $dbModuleId);

 $sessionqrystmt->store_result();

$sessionnum = $sessionqrystmt->num_rows();   

    $dataArraySession = array();

 while ( $sessionqrystmt->fetch() ) { 

 $dataArraySession[$dbSessionId]['SessionDate'] = $dbSessionDate; 
 $dataArraySession[$dbSessionId]['SessionTime'] = $dbSessionTime;

}

foreach ($dataArraySession as $sessionId => $sessionData) {



   $sessionHTML = ""; 
   $sessionHTML .= '<select name="session" id="sessionsDrop">'.PHP_EOL;
   $sessionHTML .= '<option value="">Please Select</option>'.PHP_EOL;           
   $sessionHTML .= "<option value='$sessionId'>" . $sessionId . " - " . $sessionData['SessionDate']. " - " . $sessionData['SessionTime'] ."</option>".PHP_EOL;        
   $sessionHTML .= '</select>';

        }


 if ($sessionnum > 0) {

 ?>

     <form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
     <p>Sessions: <?php echo $sessionHTML; ?><input id="sessionSubmit" type="submit" value="Submit" name="sesionsubmit" /></p>      
    </form>       

<?php

}

else {
 echo "<p>Sorry, You have No Sessions under this Module</p>";
}


}


    ?>

Answer 1

您的代码有几个问题。您遇到的问题是您没有将第1阶段的信息“$ courseid”传递到第3阶段。为此，只需将以下内容添加到第2阶段

<input type="hidden" name="courseid" value="<?=$courseid?>" />

提交后如何在页面上保持回显和下拉菜单

1 个答案: