8
points
In JavaScript it is possible to upload file dynamically with iframe in following way.
1. File upload with iframe callback example
upload.htm file:
<html>
<head>
<script>
window.Uploader = function(form, frame) {
var self = this;
if(form.getAttribute('target') !== frame.getAttribute('name')) {
throw new Error('Form is not linked with target frame.');
}
frame.addEventListener('load', function() {
frame.contentWindow.onsuccess = function(message) {
form.reset();
if(self.onsuccess)
self.onsuccess(message);
};
frame.contentWindow.onerror = function(message) {
if(self.onerror)
self.onerror(message);
};
});
frame.addEventListener('error', function() {
if(self.onerror)
self.onerror('Loading error.');
});
};
</script>
</head>
<body>
<form
id="upload-form"
action="backend.php"
target="upload-frame"
method="POST"
enctype="multipart/form-data">
<input type="file" name="file" />
<input type="submit" value="Submit" />
</form>
<iframe
id="upload-frame"
name="upload-frame"
style="display:none;">
</iframe>
<div id="upload-result"></div>
<script>
var form = document.getElementById('upload-form');
var frame = document.getElementById('upload-frame');
var result = document.getElementById('upload-result');
var uploader = new Uploader(form, frame);
uploader.onsuccess = function(message) {
result.innerHTML = '<div style="color: green;">'
+ 'Success: ' + message
+ '</div>';
};
uploader.onerror = function(message) {
result.innerHTML = '<div style="color: red;">'
+ 'Error: ' + message
+ '</div>';
};
</script>
</body>
</html>backend.php file:
<html>
<body>
<script>
function execute() {
function action() {
if (window.onsuccess && window.onerror) { // if event methods appeared
<?php
define('DST_DIR', 'C:\\wamp64\\www\\uploaded_files\\');
if($_SERVER['REQUEST_METHOD'] === 'POST')
{
if(isset($_FILES['file']))
{
$file = $_FILES['file'];
if(empty($file['name']))
echo "window.onerror('File does not exist!');";
else
{
$src_path = $file['tmp_name'];
$dst_path = DST_DIR . $file['name'];
if(move_uploaded_file($src_path, $dst_path))
echo "window.onsuccess('File upload completed.');";
else
echo "window.onerror('File move error!');";
}
}
else
echo "window.onerror('File does not exist!');";
}
else
echo "window.onerror('Unsupported request method!');";
?>
} else {
execute();
}
}
setTimeout(action, 100);
}
execute();
</script>
</body>
<html>Notes:
upload.htmandbackend.phpshould be both places on same php server- directory path
C:\wamp64\www\uploaded_files\should be changed to own path - do not forget to put backslash at the end of path and have permission for files writing there
Result:
See also
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