At this time the function ajaxSubmitFormUpdateAreas present on themes/common-theme/webapp/common/js/util/OfbizUtil.js take a form, submit it thought ajax and wait a success to analyse a json result for update an area with the cvsAreaString given on paramater.
I propose different imrpovements :
* refactoring some js code to centralize the analyze of json result for check if the call is a success or error
* Analyze the content-type of the response if is a json continue as before, else take the return and update first area (useful for submit search or filtering form)
* Manage the case who the ajax call failed and we inform the user
* Add a trigger to force the modal close on submit success