彈出說「文件正在下載」但沒有任何事發生

Question

基本上我有一個網站，讓用戶輸入兩個日期。當他們點擊提交時，會顯示一個表格，該表格僅顯示這兩個日期之間的數據。

當我點擊下載按鈕時，彈出窗口顯示該文件正在下載，但沒有任何反應。

我已經google了一下，看了這個問題的幾個答案，但雖然我沒有得到任何錯誤，該文件仍然不下載。我應該嘗試一種不同的方法嗎？

這裏是我的PHP代碼：

<?php 

    session_start(); 
    include_once("Connection.php"); 
    $StartDate = $_POST['startDate']; 
    $EndDate = $_POST['endDate']; 
    $InstructorID = $_SESSION["InstructorID"]; 


    $sql = "SELECT Instructors.InstructorName, Class.ClassName, Class.ClassType, CLASS_STUDENT.Semester, CLASS_STUDENT.Year, Students.StudentName, TUTOR_STUDENT.ClassID, TUTOR_STUDENT.Date, 
     TUTOR_STUDENT.TopicCovered, TUTOR_STUDENT.BeginTime, TUTOR_STUDENT.EndTime, TUTOR_STUDENT.TotalMinutes, Tutors.TutorName, TUTOR_STUDENT.Categories 
     FROM Instructors 
     INNER JOIN Class 
     ON Instructors.InstructorID = Class.InstructorID 
     INNER JOIN CLASS_STUDENT 
     ON Class.ClassID = CLASS_STUDENT.ClassID 
     INNER JOIN Students 
     ON CLASS_STUDENT.StudentUsername = Students.StudentUsername 
     INNER JOIN TUTOR_STUDENT 
     ON Students.StudentUsername = TUTOR_STUDENT.StudentUsername 
     INNER JOIN Tutors 
     ON TUTOR_STUDENT.TutorUsername = Tutors.TutorUsername 
     WHERE TUTOR_STUDENT.Date >= '$StartDate' AND TUTOR_STUDENT.Date <= '$EndDate' AND TUTOR_STUDENT.ClassID = CLASS_STUDENT.ClassID 
     ORDER BY TUTOR_STUDENT.Date"; 

    $result = mysqli_query($link, $sql); 

    if ($result->num_rows > 0) 
    { 

     echo " 
        <table> 
         <tr> 
          <th>Date</th> 
          <th>Class Name</th> 
          <th>Year</th> 
          <th>Semester</th> 
          <th>Topic Covered</th> 
          <th>Begin Time</th> 
          <th>End Time</th> 
          <th>Total Minutes</th> 
          <th>Tutor Name</th> 
          <th>Student Name</th> 
          <th>Catergory</th> 

         </tr> 
          "; 

          // output data of each row 
       while($row = $result->fetch_assoc()) 
       { 
         echo " 
          <tr> 
           <td>".$row["Date"]. "</td> 
         "; 
         echo " 
           <td>".$row["ClassName"]. "</td> 
         "; 
         echo " 
           <td>".$row["Year"]. "</td> 
         "; 
         echo " 
           <td>".$row["Semester"]. "</td> 
         "; 
         echo " 
           <td>".$row["TopicCovered"]. "</td> 
         "; 
         echo " 
           <td>".$row["BeginTime"]. "</td> 
         "; 
          echo " 
           <td>".$row["EndTime"]. "</td> 
         "; 
         echo " 
           <td>".$row["TotalMinutes"]. "</td> 
         "; 
          echo " 
           <td>".$row["TutorName"]. "</td> 
         "; 
         echo " 
           <td>".$row["StudentName"]. "</td> 
         "; 
         echo " 
           <td>".$row["Categories"]. "</td> 
         "; 

         echo "</tr>"; 
            } 
         echo "</table>"; 

    } 
    else 
     echo "You have no tutoring sessions between those two dates."; 

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

     $data = "Date,ClassName,Year,Semester,TopicCovered,BeginTime,EndDate,TotalMinutes,TutorName,StudentName,Categories\n"; 
     while($row = mysqli_fetch_array($result)) 
     { 
      $data.=$row['Date'].","; 
      $data.=$row['ClassName'].","; 
      $data.=$row['Year'].","; 
      $data.=$row['Semester'].","; 
      $data.=$row['TopicCovered']."\n"; 
      $data.=$row['BeginTime'].","; 
      $data.=$row['EndTime'].","; 
      $data.=$row['TotalMinutes'].","; 
      $data.=$row['TutorName'].","; 
      $data.=$row['StudentName']."\n"; 
      $data.=$row['Categories']."\n"; 

     } 

     $data_final = chr(255).chr(254).mb_convert_encoding($data, "UTF-16LE","UTF-8"); 
     header("Content-type: text/csv; charset=UTF-8"); 
     header("Content-Disposition: attachment; filename=Export.csv"); 

     print $data_final; 
     exit; 


    } 



    mysqli_close($link); 


?> 

這裏的HTML：

<p id ="byDate"> Search all tutoring sessions by date.</p> 
     <form id ="SearchByDate" action ="AdminDate.php" method="post"> 
      Start Date <input = "textbox" type="date" name ="startDate" value="" required/> 
      End Date <input = "textbox" type="date" name ="endDate" value="" required/> </br> 
      </br> 
      <button class ="button" type="submit" name = "searchDateSubmit" id ="searchDateSubmit" value ="submit"> Submit </button> 
     </form> 
     </br> 
     </br> 

     <div id ="searchDateContainer"> Date results are displayed here. 
     </div> 
     </br> 
     </br> 
     <form id ="downloadAdminDate" action="AdminDate.php" method="post"> 
     <button class ="download" type="submit" name ="downloadAdminDate" id    ="downloadDate" value="submit"> Download File </button> 
     </form> 

任何幫助，將不勝感激。

Answer 1

你似乎輸出是

<table> 

前

header("Content-type: text/csv; charset=UTF-8"); 

最後，如果裏面。 你不能這樣做，因爲在輸出任何內容之前需要輸出標題。 我建議你把代碼

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

名爲AdminDateDownload.php 另一個PHP文件，然後改變第二種形式的行動：

<form id ="downloadAdminDate" action="AdminDateDownload.php" method="post" target="_blank"> 

添加目標=「_空白」，讓你明白更容易發生的事情。