If you mean your form is on the same page as the grid view you want to have updated after the form is submitted you should look into using the KTL-Toolkit Introducing the Knack Toolkit Library (KTL) in pre-relase - by Cortex R&D Inc
Loading up the Toolkit is pretty easy, and there is a code you add to the View in Settings > Title that looks like this:
_rvs=vTitle1,vTitle2
Refresh Views after a Submit. Add this to a form’s title and when it is submitted successfully, will refresh any other views specified. Use the exact full title text, separated by commas, spaces are allowed.
Ex: Customer Sale _rvs=Client Sales, Store Sales
Here, the form’s visible title will be “Customer Sales”, and when submitted successfully, the two views with the title “Client Sales” and “Store Sales” will be refreshed. @Normand_Morbern