Your comments

Fortunately, there is already another program (from a few days in the App Store), which performs flawlessly. Goodbye Textastic. 
As I said I do not have the chance to download the whole website, so yourargument does not appeal to me.
I mean action similar to that which is the application Coda. You open the file directly from FTP, edit, save.

Currently you have to go to the manager, ftp, download the file, go back to the editor, go to the appropriate directory, select the file, edit and send to the server. The worst thing that you need to do this for each new file. Download all files to the iPad is possible only for small sites. In my case, it is impossible.

Additionally, if you have a test server, the action is even more complicated.
It would be nice if the program can edit documents on the ftp without downloading them to your device.