angular validation

Registration Page for Student

This field is required.

========The above code is working ...but the problem is in validation...

i design this form as a registration page ...after click in the button (for savedata()) i did'nt redirect in any page ,,, i want to stay in the same page ...

so befoure clicking the button the angular validation is working , and its showing proper message also ....

but after click (after data saving) also that previous error message is comming (form validation message...)...

how to solve this problem.....?????