Input_viewAttachDocument: display a popup after attaching a document

dream/platform/src/dream/Input_viewAttachDocument.js

 /*global rJS, RSVP, promiseEventListener, promiseReadAsDataURL,
-         initGadgetMixin */
+         initGadgetMixin, $, setTimeout */
 (function (window, rJS, RSVP, promiseEventListener, promiseReadAsDataURL,
            initGadgetMixin) {
   "use strict";
@@ -51,7 +51,9 @@
          "_data": JSON.stringify(data)
         });
       }).push(function (){
-        button.disabled = false;
+        // XXX quick way to get a popup message
+        $.mobile.loading( 'show', { text: "File uploaded", textVisible: true, textonly: true });
+        setTimeout(function () { $.mobile.loading( "hide" ); button.disabled = false; }, 1000);
       });
     })
     .declareMethod("render", function (options) {