Problem with information not being updated on app

On my app I have it so it displays the users information and all开发者_Python百科ows the user to update this information.

However, once the users updates the information it does not automatically update the file, then if you were to leave the page the following error comes up

But, if I cntrl + s the page it updates the page and fixes the issue while the app is running.

Is there a way to save/update the page similar to saving the page once the update button is clicked?