php to show array of $errors in javascript alert box

Question

does anyone know how to return error array in a javascript alert box? The code below that I have doesn't do the trick right. Browser returns "Cannot use [] for reading". When using $error without the bracket, browser only returns the word "Array" in the alert box but the error message is not showing. Any help?

echo '<script type="text/javascript">alert("Error: '.$errors[].'");</script>';

Updated to include the extent of my code:

  $errors = [];
      $target_dirRFP = ('accounts/' . $order_list . '/rfp/');
      $file_nameRFP = $_FILES['FileToUploadRFP']['name'];
      $file_sizeRFP = $_FILES['FileToUploadRFP']['size'];
      $extentionRFP = pathinfo($file_nameRFP, PATHINFO_EXTENSION);
      $tempRFP = ($_FILES["FileToUploadRFP"]["tmp_name"]);
      $target_fileRFP = ($target_dirRFP . $file_nameRFP);
      $valid_formatsRFP = array("pdf");

      $target_dirPSA = ('accounts/' . $order_list . '/psa/');
      $file_namePSA = $_FILES['FileToUploadPSA']['name'];
      $file_sizePSA = $_FILES['FileToUploadPSA']['size'];
      $extentionPSA = pathinfo($file_namePSA, PATHINFO_EXTENSION);
      $tempPSA = ($_FILES["FileToUploadPSA"]["tmp_name"]);
      $target_filePSA = ($target_dirPSA . $file_namePSA);
      $valid_formatsPSA = array("pdf");

          if(!empty($file_nameRFP)) {
            if(in_array($extentionRFP, $valid_formatsRFP) === false) {
              $errors[] = "The RFP you selected to upload is not allowed. Only PDF file is permitted.";
            }
            if (file_exists($target_fileRFP)) {
              $errors[] = "Attached RFP: \"'.$file_nameRFP.'\" already exists.\nPlease select another file to upload.";
            }
          }

          if(!empty($file_namePSA)) {
            if(in_array($extentionPSA, $valid_formatsPSA) === false ) {
              $errors[]="The PSA you selected to upload is not allowed. Only PDF file is permitted.";
            }
            if (file_exists($target_filePSA)) {
              $errors[] = "Attached PSA: \"'.$file_namePSA.'\" already exists.\nPlease select another file to upload.";
            }
          }

          if(empty($errors)==true) {
            move_uploaded_file($tempRFP, $target_fileRFP);
            move_uploaded_file($tempPSA, $target_filePSA);
            $stmt = $DB_CON_C->prepare("INSERT INTO `".$order_list."`
                    SET first_name = '$first_name', last_name = '$last_name'");
            $stmt->execute();
            echo '<script type="text/javascript">alert("Submitted.");</script>';
          } else {
              echo '<script type="text/javascript">alert("Error: ' . implode("; ", $errors) . '");</script>';
          }

you need to first define the variable at the top of your code as an empty array: $errors = []; — CodeGodie
– CodeGodie, Commented May 22, 2017 at 17:07
Okay, I'm new to the site. I just added. hopefully, it's more clear now. . — ubuntujavy
– ubuntujavy, Commented May 22, 2017 at 17:10

CodeGodie · Accepted Answer · 2017-05-22 18:09:08Z

2

Using implode() and entering new lines is most likely the best way.

Example:

<?php
$errors = [];

if( validateFails() ){
    $errors[] = "some error found";
}

if( failAgain() ){
    $errors[] = "some other error";
}

echo '<script>alert("'.implode("\\n", $errors).'");</script>';

UPDATE:

Another error lies on your error message string syntax. Take a look at this line:

$errors[] = "Attached PSA: \"'.$file_namePSA.'\" already exists.\nPlease select another file to upload.";

This should be re-written to:

$errors[] = "Attached PSA: $file_namePSA already exists.\\nPlease select another file to upload.";

As any variable inside double quotes "..." will be echoed out correctly. And a new line in the string should be \\n not \n.

edited May 22, 2017 at 18:09

answered May 22, 2017 at 16:45

CodeGodie

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7 Comments

ubuntujavy Over a year ago

Not working, CodeGodie. Even worst, the Browser didn't detect any error even though I purposely planted error for testing.

CodeGodie Over a year ago

@ubuntujavy have you defined your $errors variable as an empty array?

ubuntujavy Over a year ago

I just did, but it didn't work. I just updated my question to include the rest of my code. I think there's a syntax error somewhere in there but couldn't spot it.

CodeGodie Over a year ago

Theres a lot going on in your code. You have variables that I dont know what they are like : $file_nameRFP, $extentionRFP, $valid_formatsRFP, etc.. any of those can be giving you different results.

ubuntujavy Over a year ago

Can you check my code again? I just updated my code to include variables sources.

|

Rayann Nayran · Accepted Answer · 2017-05-22 16:39:43Z

1

You could transform your array in string with implode()

echo '<script type="text/javascript">alert("Error: ' . implode("; ", $errors) . '");</script>';

answered May 22, 2017 at 16:39

Rayann Nayran

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4 Comments

ubuntujavy Over a year ago

Doesn't work Rayann. Browser doesn't return any errors even though there is error planted for testing purpose.

Rayann Nayran Over a year ago

My code is correct and tested, check my comment on your question.

ubuntujavy Over a year ago

I believe your code work, but for some reasons, it doesn't work on mine. I have updated my question to include the extent of the code. Can you check to spot what's wrong with it?

Rayann Nayran Over a year ago

If no errors are being shown, the $errors is empty.

David · Accepted Answer · 2017-05-22 16:40:24Z

1

You'd have to create a single string representation of some sort. For example, you could "implode" the array using a delimiter. Something like:

echo '<script type="text/javascript">alert("Error: ' . implode(', ', $errors) . '");</script>';

This would just be a simple comma+space delimiter between all of the array elements. If you need something more complex or with more styling (in which case you probably don't want an alert() in the first place) then you could manually build any string you like from the contents of the array. You just need to output a string to the page, not an array directly.

answered May 22, 2017 at 16:40

David

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10 Comments

ubuntujavy Over a year ago

Doesn't work David. Browser doesn't return any errors even though there is error planted for testing purpose.

David Over a year ago

@ubuntujavy: Can you provide a minimal and complete example of the problem? The code shown in the question doesn't guarantee that $errors isn't simply an empty array.

ubuntujavy Over a year ago

David, here is my error detection lines. if(!empty($file_nameRFP)) { if(in_array($extentionRFP, $valid_formatsRFP) === false) { $errors[] = "The RFP you selected to upload is not allowed. Only PDF file is permitted."; } if (file_exists($target_fileRFP)) { $errors[] = "Attached RFP: \"'.$file_nameRFP.'\" already exists.\nPlease select another file to upload."; } }

David Over a year ago

@ubuntujavy: Code belongs in the question, for obvious readability reasons.

ubuntujavy Over a year ago

Sorry. I'm new to the site and didn't realize I could edit code after 5 mins. I have updated my question to include error detection code.

|

Waqas Ahmed · Accepted Answer · 2017-05-22 16:42:19Z

0

Hopefully you will get exact output.Please try

alert(JSON.stringify($errors));

answered May 22, 2017 at 16:42

Waqas Ahmed

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4 Comments

ubuntujavy Over a year ago

Thanks. I got syntax error. Where would I be adding your code into mine? echo '<script type="text/javascript">alert("Error: '.$errors[].'");</script>';

Waqas Ahmed Over a year ago

Yes echo '<script type="text/javascript">alert(JSON.stringify('.$errors.'));</script>';

ubuntujavy Over a year ago

Not working Waquas. I got Array to string conversion error.

Waqas Ahmed Over a year ago

Let me check please

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