Form.Upload 0.3

Upload your files the HTML5 way, drag and drop from your computer, multiple files the ajaxy way!

It works about the same as uploading attachments to gmail.

  • HTML5 Drag and Drop files from your computer
  • HTML5 multiple attribute files for selecting multiple files
  • Uploading files through XMLHttpRequest with FormData
  • Progress bar
  • Graceful degradation for IE / Opera


Arian Stolwijk
Current version
GitHub Issues



  • _self_/_current_:
    • Element.Event
    • Class
    • Options
    • Events
    • Form.MultipleFileInput
    • Request.File
    • Request

How to use

Include the JavaScript files in your page, for example with the <script> tag, or with a Script Loader with an extra check for FormData support.

When using the last option it'll look something like:

if ('FormData' in window){
    // Load Form.MultipleFileInput.js
    // Load Request.File.js
} else {
    // Load IframeFormRequest
    // e.g.

If you're not using a Script Loader, just include MooTools and all three files:

<script src=""></script>
<script src="../Source/Request.File.js"></script>
<script src="../Source/Form.MultipleFileInput.js"></script>
<script src="../Source/Form.Upload.js"></script>

To get the magic running just initiate the Form.Upload class:

new Form.Upload('url');

This is for the html structure like

<form method="post" action="files.php" enctype="multipart/form-data">
    <legend>Upload Files</legend>

    <div class="formRow">
        <label for="url" class="floated">File: </label>
        <input type="file" id="url" name="url[]" multiple><br>

    <div class="formRow">
        <input type="submit" name="upload" value="Upload">



The Form.Upload class has only one event: onComplete. This is only used in the HTML5 uploader

Graceful Degradation

Note that in the HTML the input is wrapped in a div.formRow element. This is for the graceful degradation in older browsers. The Form.Upload class will clone the first parent that maches .formRow of the input#url element. Then it will append the clones after that div.formRow element.

By default it will just upload the files and go to the page given in the action attribute, like any other form post. With the isModern() method you could check whether it's using the HTML5 possibilities or the legacy upload.


var upload = new Form.Upload('url', {
    onComplete: function(){
        alert('Completed uploading the Files');

if (!upload.isModern()){
    // using iFrameFormRequest from the forge to upload the files
    // in an IFrame.
    new iFrameFormRequest('myForm', {
        onComplete: function(response){
            alert('Completed uploading the files');

Using the files separately

The Form.Upload Class is just a useful class to use when you quickly want to build the upload form. However the Form.MultipleFileInput and File.Request classes can be used separately too!


This is a class that transforms a simple input[type="file"] into a multiple file input field with even drag and drop!

Checkout the source for all options and events. That's not very spectacular.


This is a class that extends Request and brings file uploading to Request. Some credits should go to fellow MooTools Developer Djamil Legato for proving this class.

In this version it is a very stripped down version and not all Request options might work. In 95% of the cases you don't really need them though, so it doesn't matter really.

Combining Form.MultipleFileInput and Request.File

When the user has selected all the files, they can be uploaded. To bridge those to classes, usually Form.Upload can be used.

However if you want more control, the following can be done:

// the input element, the list (ul) and the drop zone element.
var input, list, drop;
// Form.MultipleFileInput instance
var inputFiles = new Form.MultipleFileInput(input, list, drop, {
    onDragenter: drop.addClass.pass('hover', drop),
    onDragleave: drop.removeClass.pass('hover', drop),
    onDrop: drop.removeClass.pass('hover', drop)

// Request instance;
var request = new Request.File({
    url: 'files.php'
    // onSuccess
    // onProgress

myForm.addEvent('submit', function(event){
        request.append('url[]' , file);

In the last loop, we loop over the File instances and we append them to the request:

request.append((string) fieldname, (File) file);


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Found a bug in this plugin? Please report it this repository's Github Issues.

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