Evgeny Kolyakov

Can you please explain?
Because it does loop... even on my nexus5 :)

That depends on how you implement the submission itself...

I personally also add a time-stamp in the user's session, for a real person not to send too many mails and check if that time-stamp is "older" than 5-15 minutes, otherwise I return a relevant message via the AJAX and display it using JS.

This post is pretty generic :)

Here's a working Demo :)

http://jsfiddle.net/thenetfreaker/qt0rmahr/2/

Sorry the site got closed ... It was a website I built for a friend and I wanted to build it purely on AngularJS.

Nevertheless, the code still works ^_^