SOURCE CODE: Uize.Comm.Iframe.Upload (view docs)

/*______________
|       ______  |   U I Z E    J A V A S C R I P T    F R A M E W O R K
|     /      /  |   ---------------------------------------------------
|    /    O /   |    MODULE : Uize.Comm.Iframe.Upload Class
|   /    / /    |
|  /    / /  /| |    ONLINE : http://www.uize.com
| /____/ /__/_| | COPYRIGHT : (c)2004-2016 UIZE
|          /___ |   LICENSE : Available under MIT License or GNU General Public License
|_______________|             http://www.uize.com/license.html
*/

/* Module Meta Data
  type: Class
  importance: 4
  codeCompleteness: 100
  docCompleteness: 40
*/

/*?
  Introduction
    The =Uize.Comm.Iframe.Upload= class implements support for file upload by submitting form data to a server and targeting its response back to an IFRAME.

    *DEVELOPERS:* `Ben Ilegbodu`

    In order to implement support for upload through an IFRAME, this class overrides the implementation of the =performRequest= instance method inherited from the =Uize.Comm.Iframe= base class. There are no additional methods or properties provided by this class - all the interface is provided in the =Uize.Comm= superclass.
*/

Uize.module ({
  name:'Uize.Comm.Iframe.Upload',
  required:[
    'Uize.Dom.Basics',
    'Uize.Url'
  ],
  builder:function (_superclass) {
    'use strict';

    return _superclass.subclass ({
      instanceMethods:{
        performRequest:function (_request,_callback) {
          var
            m = this,
            _iframe = Uize.Dom.Basics.getById(m.iframeId),
            _uploadForm = _request.uploadForm,
            _uploadFormTarget = _uploadForm.target,
            _returnType = _request.returnType,
            _returnTypeIsObject = _returnType == 'object'
          ;
          handleResponse = function (_responseResult) {
            if (_returnTypeIsObject || _returnType == 'json')
              _request.responseJson = Uize.clone (_responseResult)
            ;
            Uize.Dom.Basics.isIe && _iframe.contentWindow.history.go (-1);
            _uploadForm.target = _uploadFormTarget;
            _callback ();
          };

          _uploadForm.action = Uize.Url.resolve(
            _uploadForm.action,
            {
              comm_mode:'iframe',
              output:'js',
              rnd:Uize.Url.getCacheDefeatStr ()
            }
          );

          _uploadForm.target = _iframe.name;
          _uploadForm.submit();
        }
      }
    });
  }
});