Runs a function for each repeated item with the given IDs.
Use the forItems() function to run a function on a specified list of
repeated items. You can use the callback function to update or pull
information from the specified repeated items.
When you set a repeater's data property with data that changes
items with existing IDs, those changes are not automatically reflected
in the elements contained in the repeater. That is because you are
responsible for applying a repeater's data to its repeated items.
To apply the data to items with new IDs, you can use the onItemReady()
event handler.
To update items with existing IDs, you can use the forEachItem() or
forItems() functions.
Usually, when updating repeated items you:
Apply the repeated item's itemData to the properties and functions
of the repeated elements contained in the repeated item being created.
For example, you can use onItemReady() to set the src
property of an image in the repeater to a mobile image source found in the itemData
object and then show() the mobile image.
Add event handlers to the repeated elements contained in the repeated item being created.
For example, you can use onItemReady() to set the onPress()
event handler of a button in the repeater.
The IDs of the items on which to run the callback function.
callback($item: $w, itemData: object, index: number): void The name of the function to run for each repeated item.