Im working on a tile based tmx editor and currently have file saving working. Currently it passes the tmx to a php file called endpoint that downloads the file. it can be viewed here www.jamesplanet.net/growtopiamapeditor/beta.
What I need to know is it possible to use php to upload a file then pass the file to javascript to load into the editor?
If you need a copy of the source I can put a link
If this question isn't worded correctly or hasn't enough information please don't down vote. instead let me know what else you need to know.