Now the submission has been caught by angular2 even with action= in the
demo link: http://plnkr.co/edit/4wpTwN0iCPeublhNumT5?p=preview
You can also submit form in this way.
Here is HTML markup.
(...) (...) Send
And here is code in your .ts file.
onSubmit(e) { e.target.submit(); }