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Uploading files using xhr.send(FormData) to PHP server
$fileName = $_FILES['afile']['name'];
$fileType = $_FILES['afile']['type'];
$fileContent = file_get_contents($_FILES['afile']['tmp_name']);
$dataUrl = 'data:' . $fileType . ';base64,' . base64_encode($fileContent);
$json = json_encode(array(
'name' => $fileName,
'type' => $fileType,
'dataUrl' => $dataUrl,
'username' => $_REQUEST['username'],
'accountnum' => $_REQUEST['accountnum']
echo $json;
<!DOCTYPE html>
Copyright 2012 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.
Author: Eric Bidelman (
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" />
<title>xhr.send(FormData) Example</title>
<input type="file" name="afile" id="afile" accept="image/*"/>
document.querySelector('#afile').addEventListener('change', function(e) {
var file = this.files[0];
var fd = new FormData();
fd.append("afile", file);
// These extra params aren't necessary but show that you can include other data.
fd.append("username", "Groucho");
fd.append("accountnum", 123456);
var xhr = new XMLHttpRequest();'POST', 'handle_file_upload.php', true);
xhr.upload.onprogress = function(e) {
if (e.lengthComputable) {
var percentComplete = (e.loaded / * 100;
console.log(percentComplete + '% uploaded');
xhr.onload = function() {
if (this.status == 200) {
var resp = JSON.parse(this.response);
console.log('Server got:', resp);
var image = document.createElement('img');
image.src = resp.dataUrl;
}, false);
<!--[if IE]>
<script src=""></script>
<script>CFInstall.check({mode: 'overlay'});</script>

Thanks so much :)
I was looking for how to use $_FILES with an AJAX post and everywhere they only showed the JavaScript but not how to handle the data in PHP.

cmosguy commented Jul 4, 2013

Does this work in IE? I havin gissues in IE getting things to work properly with the fd FormData.

"var resp = JSON.parse(this.response);"
whats wrong with this above line in IE ?

below is my code but when i post it to the java server i get nulls on parameters can some one help.

<script> Polymer('my-element', { setFiles: function(e, detail, sender) { formData = new FormData(); ``` for (var i = 0, f; f = sender.files[i]; ++i) { formData.append(, f,; // alert(; formData.append("name",this.$.name.value ); // alert( f.description); formData.append("descritpion",this.$.description.value ); //alert(this.$.description.value || f.description); formData.append("title",this.$.title.value); // alert(this.$.title.value || f.title); } this.$.ajax.body = formData; // Override default type set by core-ajax. // Allow browser to set the mime multipart content type itself. this.$.ajax.contentType = null; }, upload: function(e, detail, sender) { // alert(this.$.title.value || f.title); if (!this.$.file.files.length) { alert('Please include a file'); return; } this.$.ajax.go(); }, responseChanged: function() { console.log('Response from server', this.response); }, }); ``` </script>

Nicee job using FormData in JavaScript to populate $_FILES variable in php, i was wandering some days ago, why not try to populate $_FILES variable, you did it anyway !

Nice job, thank you very much (y)

kressly commented Mar 6, 2015

Please for days now i have been looking for how to modifiy that code and get it to do a multiple upload. Please can you show how to do a multiple upload with this ?

Daniel15 commented Jun 5, 2015

@kressly Just include multiple files in the FormData.

and if i want to save the image in a carpet or path

ahxxan commented Mar 17, 2016

{"name":null,"type":null,"dataUrl":"data:;base64,","username":null,"accountnum":null} as output
i am receiving this . can some one help to resolve my issue @chrisp22 could you find solution

You can find a working implementation of uploading file using XMLHttpRequest here.

rod101 commented Nov 16, 2016

Hi All,
Is there a way I can append the image path without using the file input
I have tried formData.append('avatar', avatar.files[0], 'cc.jpg'); any help please

Awesome, have been looking for this all day!

Thank you very much. Your example help me so much. I looking long time how to upload files to server via xhr. And again, thank you so much.

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