How to call a php function from javascript alert
Question
Basically what i am trying to do is- create a page to upload file. Below is the code and its working fine:
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function wow_default_alert() {alert("Successfully saved!"); }
</script>
</head>
<body>
<form action="index.php" method="post" name="myForm" enctype="multipart/form-data">
Select image to upload:
<input type="file" name="fileToUpload" id="fileToUpload">
<input type="submit" value="Upload Image" name="submit">
</form>
<?php
if(isset($_POST["submit"])) {
if (!file_exists('.\\tigerimg\\'))
{
mkdir('.\\tigerimg\\', 0777, true);
}
$target_dir = '.\\tigerimg\\';
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
"File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
} else {
"File is not an image.";
$uploadOk = 0;
}
// Check if file already exists
if (file_exists($target_file)) {
echo "Sorry, file already exists.";
$uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file))
{
// echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
echo '<script type="text/javascript">
wow_default_alert();
</script>';
} else {
echo "Sorry, there was an error uploading your file.";
}
}
}
?>
But the problem is that if i refresh the page again -after uploading one file successfully, it works with the same post values.
Previously i used the below code to unset post data-which worked for other pages.
clear Code-1
<?php
session_start();
if( strcasecmp($_SERVER['REQUEST_METHOD'],"POST") === 0)
{
$_SESSION['postdata'] = $_POST;
header("Location: ".$_SERVER['PHP_SELF']."?".$_SERVER['QUERY_STRING']);
exit;
}
if( isset($_SESSION['postdata']))
{
$_POST = $_SESSION['postdata'];
unset($_SESSION['postdata']);
}
?>
But i cant use it in this one. It shows error:
Undefined index: fileToUpload in C:\xampp\htdocs\up\index.php on line 41
Notice: Undefined index: fileToUpload in C:\xampp\htdocs\up\index.php on line 47
Warning: getimagesize(): Filename cannot be empty in C:\xampp\htdocs\up\index.php on line 47
Notice: Undefined index: fileToUpload in C:\xampp\htdocs\up\index.php on line 62
So, i tried to also clear the FILES array too by adding 3 lines with the above code.
clear Code-2
<?php
session_start();
if( strcasecmp($_SERVER['REQUEST_METHOD'],"POST") === 0)
{
$_SESSION['postdata'] = $_POST;
$_SESSION['filedata'] = $_FILES; //new code
header("Location: ".$_SERVER['PHP_SELF']."?".$_SERVER['QUERY_STRING']);
exit;
}
if( isset($_SESSION['postdata']))
{
$_POST = $_SESSION['postdata'];
$_FILES = $_SESSION['filedata']; //new
unset($_SESSION['postdata']);
unset($_SESSION['filedata']); //new
}
?>
But now its showing only one error:
Warning: getimagesize(C:\xampp\tmp\php1A2F.tmp): failed to open stream: No such file or directory in C:\xampp\htdocs\up\index.php on line 51.
>>> So, here is one question- why is this happening?
Ok, now i tried another way put the above [clear Code-1] inside a php function function remove_post() and call it just after the code of successful uploading- where i called the alert.
This time its working fine. But now the problem is that the alert doesn't appear. So, is it possible to call the function remove_post() when user clicks the ok in alert.
2 answers
solution1
1 ACCPTED 2015-09-19 23:27:08
It looks like you are trying to copy from W3Schools web site, which is not the greatest of places. At any rate, in this instance, I think you may want to do all your processing at the top of your page like so:
<?php
// Not sure if you are storing anything in sessions...
session_start();
// Create a root
define("ROOT_DIR",__DIR__);
// Create a function so you can customize it if you want to
function SaveFileToDisk($dir = '/tigeimg/',$allow = array("image/png","image/jpeg","image/gif"))
{
// Make directory if not exists
if(!is_dir($mkdir = ROOT_DIR.$dir)) {
if(!mkdir($mkdir,0755,true))
return 'mkdir';
}
// Filter filename
$name = preg_replace("/[^0-9a-zA-Z\.\_\-]/","",$_FILES["fileToUpload"]["name"]);
// Assign name
$filename = (!empty($name))? $name : false;
// If empty, record error
if(!$filename)
$error[] = 'nofile';
// Get mime type
$mime = (!empty($_FILES["fileToUpload"]["tmp_name"]))? getimagesize($_FILES["fileToUpload"]["tmp_name"]) : false;
// Record if invalid
if(!$mime)
$error[] = 'invalid';
// Filter out double forward slashes (if user decides to change $dir)
// and adds too many forward slashes
$final = str_replace("//","/",ROOT_DIR."/".$dir."/".$filename);
// If file exists, record error
if(is_file($final))
$error[] = 'exists';
// If too big record error
if($filename > 500000)
$error[] = 'size';
// If not in the allowed file types, record error
if(!in_array($_FILES["fileToUpload"]["type"],$allow))
$error[] = 'type';
// Return array of errors
if(!empty($error))
return $error;
// True or false if no errors are recorded previously
return (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"],$final));
}
// Just create a simple error returning function
// This is expandable by adding error descriptions stored in database if desired
function ErrorReporting($value = false)
{
$msg['invalid'] = "INVALID File!";
$msg['type'] = "The file you are trying to upload is not a valid image type.";
$msg['exists'] = "The file you are trying to upload is already uploaded.";
$msg['size'] = "The file you are trying to upload is too large.";
$msg['nofile'] = "The file you are trying to upload has no name.";
if($value === true)
return "Successfully uploaded!";
elseif(is_array($value)) {
foreach($value as $error) {
$err[] = (!empty($msg[$error]))? $msg[$error]:"";
}
if(!empty($err))
return implode("",$err);
}
else
return "File failed to upload.";
}
// If post is submitted
if(isset($_POST["submit"]))
// Run the uploader function
$success = SaveFileToDisk();
?><!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
<?php
// if there is an upload, run the js alert
if(isset($success)) {
?>
function error_alert(errmsg)
{
alert(errmsg);
}
error_alert("<?php echo ErrorReporting($success); ?>");
<?php }
?>
</script>
</head>
<body>
<form action="" method="post" name="myForm" enctype="multipart/form-data">
Select image to upload:
<input type="file" name="fileToUpload" id="fileToUpload">
<input type="submit" value="Upload Image" name="submit">
</form>
</body>
</html>
solution2
0 2015-09-19 18:00:29
After user clicks OK for alert you can call the php function as
alert('Your alert');
document.write(' <?php remove_post(); ?> ');
Your remove_post() function will get called after user click OK on alert
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