getItems( )

Note:

A dataset needs to load its data before you call its getItems() function. Usually a dataset finishes loading a short time after the page it is on finishes loading. So if you call getItems() inside the page’s onReady() event handler, the dataset might not be ready yet.

To call getItems() as soon as possible after a page loads, use the dataset's onReady() function inside the page’s onReady() event handler to ensure that both the page and the dataset have finished loading.