Start fixing #214 - workaround for bug in IE8 iframe onload implementation

IE8 doesn't honour onload listeners attached using Javascript. See: http://stackoverflow.com/questions/12910534/why-doesnt-ie8-handle-iframe-onload-events This commit attaches the handler using HTML instead. A further commit will be needed to reorder the code to avoid a race condition where the iframe is initialized before the handler is setup.

Author: Dave Gurnell

lib/FileAPI.XHR.js

@@ -78,7 +78,7 @@
 },
 
 _send: function (options, data){
-var _this = this, xhr, uid = _this.uid, url = options.url;
+var _this = this, xhr, uid = _this.uid, onloadFuncName = _this.uid + "Load", url = options.url;
 
 api.log('XHR._send:', data);
 
@@ -98,7 +98,7 @@
 
 xhr = document.createElement('div');
 xhr.innerHTML = '<form target="'+ uid +'" action="'+ url +'" method="POST" enctype="multipart/form-data" style="position: absolute; top: -1000px; overflow: hidden; width: 1px; height: 1px;">'
-+ '<iframe name="'+ uid +'" src="javascript:false;"></iframe>'
++ '<iframe name="'+ uid +'" src="javascript:false;" onload="' + onloadFuncName + '()"></iframe>'
 + (jsonp && (options.url.indexOf('=?') < 0) ? '<input value="'+ uid +'" name="'+jsonp+'" type="hidden"/>' : '')
 + '</form>'
 ;
@@ -140,7 +140,7 @@
 _this.end(status, statusText);
 
 api.event.off(window, 'message', onPostMessage);
-window[uid] = xhr = transport = transport.onload = null;
+window[uid] = xhr = transport = window[onloadFuncName] = null;
 }
 ;
 
@@ -156,7 +156,7 @@
 
 api.event.on(window, 'message', onPostMessage);
 
-transport.onload = function (){
+window[onloadFuncName] = function (){
 try {
 var
  win = transport.contentWindow
@@ -373,7 +373,7 @@
 
 }
 } else {
-// FormData 
+// FormData
 xhr.send(data);
 }
 }