Saves the current item.
The save() function returns a Promise that is resolved to the saved item
when:
Calling save() on a read-only dataset causes the Promise to reject.
Notes:
A dataset needs to load its data before you call its save() function.
Usually a dataset finishes loading a short time after the page it is on finishes loading. So if you call save() inside the page’s onReady() event handler, the dataset might not be ready yet.
To call save() as soon as possible after a page loads, use the dataset's onReady() event handler to ensure that both the page and the dataset have finished loading.
When using a read-write dataset and linked input elements, calling any of the following functions will save any changes made in the linked input elements.