Question

I have a situation with my php code. What I am currently doing is using the iframe to link the javascript message with the phe script. In the javascript function stopImageUpload, I have stated that if success = 2, then display the cancel message for the file upload.

So what I have tried but failed to do in the php script is to try and state that if the $result = 2 (In other words if success = 2 message appears in javascript), then delete the database row. How can this be done?

Below is the form code:

var $fileImage = $("<form action='imageupload.php' method='post' enctype='multipart/form-data' target='upload_target' onsubmit='return imageClickHandler(this);' class='imageuploadform' >" + 
  "Image File: <input name='fileImage' type='file' class='fileImage' /></label><br/><br/><label class='imagelbl'>" + 
  "<input type='submit' name='submitImageBtn' class='sbtnimage' value='Upload' /></label>" +     
  "</p><p class='imagef1_cancel' align='center'><label>" + 
  "<input type='button' name='imageCancel' class='imageCancel' value='Cancel' /></label>" +
  "<iframe class='upload_target' name='upload_target' src='#' style='width:0;height:0;border:0px;solid;#fff;'></iframe></form>");

Below is the startImageUpload() function where it starts an file upload and where the cancel button function is stored:

  function startImageUpload(imageuploadform, imagefilename){
    $('.imagef1_cancel').eq(window.lastUploadImageIndex).find(".imageCancel").on("click", function(event) {
      return stopImageUpload(2);
      });     
    return true;
  }

Below is the stopImageUpload() function where it displays the cancel message using success and result:

function stopImageUpload(success, imagefilename){
  var result = '';
  if (success == 2){
    result = '<span class="imagecemsg"> The file upload was canceled!</span><br/><br/>';
  } else {
    result = '<span class="imageemsg">There was an error during file upload!</span><br/><br/>';
  }         
  return true;   
}

Finally below is the imageupload.php script which is linked to the QandATable.php (The script which contains the code above) using iframe and this is where the database row is suppose to be inserted and deleted from:

    <?php
      session_start();
      ...//connected to DB
      $result = 0;

if( file_exists("ImageFiles/".$_FILES['fileImage']['name'])) {
    $result = 1;

    $imagesql = "INSERT INTO Image (ImageFile) 
    VALUES ('ImageFiles/".mysql_real_escape_string($_FILES['fileImage']['name'])."')";

    mysql_query($imagesql);

}
    else
      {

      $result = 1;

        $imagesql = "INSERT INTO Image (ImageFile) 
        VALUES ('ImageFiles/".mysql_real_escape_string($_FILES['fileImage']['name'])."')";

mysql_query($imagesql);

      }

      if ($result == 2) {
        $imagecancelsql = "DELETE FROM Image 
                           WHERE ImageFile = 'ImageFiles/".
                           mysql_real_escape_string($_FILES['fileImage']['name'])."'";
        mysql_query($imagecancelsql);
      }
      mysql_close();
    ?>
    <script language="javascript" type="text/javascript">window.top.stopImageUpload(<?php echo $result ? 'true' : 'false'; ?>, '<?php echo $_FILES['fileImage']['name'] ?>');</script>

Answer 1

There are severe issues with your code that need to be addressed:

1)

This line:

return stopImageUpload(2);

Is calling the function:

function stopImageUpload(success, imagefilename){...}

But the stopImageUpload function needs two parameters, success and imagefilename

---

2)

This function returns true, but should return the contents of result.

function stopImageUpload(success, imagefilename){
  ...
  return true;   
}

---

3)

Here you set $result with the value 0, and compare it with the value 2 ?!?

$result = 0;

if ($result == 2) {

---

4)

This function accepts two parameters, but none of them is used inside ?!?

function startImageUpload(imageuploadform, imagefilename){...}

Also, it is returning

return stopImageUpload(2);

or

return true;

Are you controlling this situation!

Note: Where do you use this function ?!?

---

5)

This verification likely fails because file_exists checks whether a file or directory exists. So, if the file does not exist, surely the directory does, and it will continue to execute.

if( file_exists("ImageFiles/".$_FILES['fileImage']['name'])) {

you should use is_file that tells you if the file is a regular file.

---

6)

You should not be using mysql_query anymore, please read PDO Tutorial for MySQL Developers

mysql_query($imagesql)

---

Please read this topics: ^{to learn why are you failing to achieve your goal}

PHP Variables

JavaScript Variables

JavaScript Functions

PHP File Upload e.g. 1 | PHP File Upload e.g. 2 | PHP File Upload e.g. 3

---

I hope this may help you getting on the right track and fixing some issues with your present code.

Best of Luck!