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    2.0.0 • Public • Published

    FileDrop Revamped

    Self-contained cross-browser HTML5, legacy, AJAX, drag & drop JavaScript file upload

    FileDrop is a lightweight JavaScript class for easy-to-use file uploading that works out of the box and supports even most legacy browsers.

    [ Documentation | Demo page ]


    • Cross-browser – supports Firefox 3.6, Internet Explorer 6, Google Chrome 7, Apple Safari 5 and Opera 11.61.
    • No JS dependencies, Flash or Java applets
    • 900 lines of code, 1300 lines of comments
    • 16 KiB minified, 6 KiB gzipped
    • HTML5, drag & drop for modern browsers
    • IFrame fallback for legacy agents (IE 6+)
    • Flexible event system with over 15 callbacks
    • Multiple independent FileDrops on one page
    • Ready for jQuery, PHP, and others
    • 500+ lines of unit tests (tests.html)

    Basic example

    Live demo

    <!DOCTYPE html>
        <meta charset="utf-8">
        <title>Basic FileDrop example</title>
        <script type="text/javascript" src="../filedrop.js"></script> 
        <script type="text/javascript" src="filedrop.js"></script> 
        <style type="text/css">
          Styles below are only required if you're using <iframe> fallback in
          addition to HTML5 drag & drop (only working in Firefox/Chrome).
        /* Essential FileDrop zone element configuration: */
        .fd-zone {
          position: relative;
          overflow: hidden;
          /* The following are not required but create a pretty box: */
          width: 15em;
          margin: 0 auto;
          text-align: center;
        /* Hides <input type="file"> while simulating "Browse" button: */
        .fd-file {
          opacity: 0;
          font-size: 118px;
          position: absolute;
          right: 0;
          top: 0;
          z-index: 1;
          padding: 0;
          margin: 0;
          cursor: pointer;
          filter: alpha(opacity=0);
          font-family: sans-serif;
        /* Provides visible feedback when use drags a file over the drop zone: */
        .fd-zone.over { border-color: maroon; background: #eee; }
        <noscript style="color: maroon">
          <h2>JavaScript is disabled in your browser. How do you expect FileDrop to work?</h2>
        <h2 style="text-align: center">
          <a href="">FileDrop</a> basic sample
        <!-- A FileDrop area. Can contain any text or elements, or be empty.
             Can be of any HTML tag too, not necessary fieldset. -->
        <fieldset id="zone">
          <legend>Drop a file inside&hellip;</legend>
          <p>Or click here to <em>Browse</em>..</p>
          <!-- Putting another element on top of file input so it overlays it
               and user can interact with it freely. -->
          <p style="z-index: 10; position: relative">
            <input type="checkbox" id="multiple">
            <label for="multiple">Allow multiple selection</label>
        <script type="text/javascript">
          // Tell FileDrop we can deal with iframe uploads using this URL:
          var options = {iframe: {url: 'upload.php'}};
          // Attach FileDrop to an area ('zone' is an ID but you can also give a DOM node):
          var zone = new FileDrop('zone', options);
          // Do something when a user chooses or drops a file:
          zone.event('send', function (files) {
            // Depending on browser support files (FileList) might contain multiple items.
            files.each(function (file) {
              // React on successful AJAX upload:
              file.event('done', function (xhr) {
                // 'this' here points to fd.File instance that has triggered the event.
                alert('Done uploading ' + + ', response:\n\n' + xhr.responseText);
              // Send the file:
          // React on successful iframe fallback upload (this is separate mechanism
          // from proper AJAX upload hence another handler):
          zone.event('iframeDone', function (xhr) {
            alert('Done uploading via <iframe>, response:\n\n' + xhr.responseText);
          // A bit of sugar - toggling multiple selection:
          fd.addEvent(fd.byID('multiple'), 'change', function (e) {
            zone.multiple(e.currentTarget || e.srcElement.checked);

    jQuery integration

    FileDrop can be integrated with jQuery by simply calling the following method (once, after loading both FileDrop and jQuery): fd.jQuery().

    Drop zone events are prefixed with fd while individual file events start with file. DOM node events are triggered before those assigned to obj.on.XXX arrays and if a node handler returns non-null value on’s events are skipped.

    Note that jQuery will prepend its own event object in front of FileDrop’s normal event arguments since they’re triggered as regular events of a DOM node. See extensive comments in the sources for more details and examples.

    More information in the documentation

    fd.jQuery();  // you can also pass an object like 'jQuery'.
    // Henceforth it's possible to access FileDrop as $().filedrop().
    $('<div><p>Drop something here...</p></div>')
      // jQuery always passes event object as the first argument.
      .on('fdsend', function (e, files) {
        $.each(files, function (i, file) {
      .on('filedone', function (e, file) {
        alert('Done uploading ' + + ' on ' + this.tagName);


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