common/src/web/transparentUpload.html

<!DOCTYPE html>
<html>
<head>
  <title>Upload Form</title>
  <style>
    .fileUpload {
      position: relative;
      overflow: hidden;
      margin: 10px;
	  background-color: #FFFFFF;
      width: 50px;
      text-align: center;
    }
    .fileUpload input.upload {
      position: absolute;
      top: 0;
      right: 0;
      margin: 0;
      padding: 0;
      font-size: 20px;
      cursor: pointer;
      opacity: 0;
      filter: alpha(opacity=0);
      height: 100%;
      text-align: center;
    }
  </style>
  <script>
      var intervalId;
      function onTick() {
          var label = document.getElementById('upload_label');
          label.innerHTML += '.';
      }

      function onUploadSubmit() {
          document.getElementById('upload_target').contentWindow.document.body.
          innerHTML = '';
          var label = document.getElementById('upload_label');
          label.innerHTML = 'Uploading "' + document.forms[0].upload.value + '"';
          label.style.display = '';
          intervalId = window.setInterval(onTick, 500);
          return true;
      }

      function onUploadDone() {
          var label = document.getElementById('upload_label');
          label.style.display = 'none';
          window.clearInterval(intervalId);
          return true;
      }
  </script>
</head>
<body>
<form action="/common/upload" method="post" name="upload_form"
      target="upload_target" enctype="multipart/form-data"
      onsubmit="onUploadSubmit();">
  <div>
    <div class="fileUpload">
      <span>Upload</span>
      <input id="upload" name="upload" type="file" class="upload" />
    </div>
    <div><input id="go" type="submit" value="Go!"/></div>
  </div>
  <div id="upload_label" style="display:none"></div>
  <iframe src="" id="upload_target" name="upload_target"
          style="width:300px;height:200px">
  </iframe>
</form>
</body>
</html>