IterableChanges

IterableChanges

interface

An object describing the changes in the Iterable collection since last time IterableDiffer#diff() was invoked.

interface IterableChanges<V> {
  forEachItem(fn: (record: IterableChangeRecord<V>) => void): void
  forEachOperation(fn: (record: IterableChangeRecord<V>, previousIndex: number, currentIndex: number) => void): void
  forEachPreviousItem(fn: (record: IterableChangeRecord<V>) => void): void
  forEachAddedItem(fn: (record: IterableChangeRecord<V>) => void): void
  forEachMovedItem(fn: (record: IterableChangeRecord<V>) => void): void
  forEachRemovedItem(fn: (record: IterableChangeRecord<V>) => void): void
  forEachIdentityChange(fn: (record: IterableChangeRecord<V>) => void): void
}

Class implementations

• DefaultIterableDiffer

Methods

forEachItem()
Iterate over all changes. IterableChangeRecord will contain information about changes to each item.
forEachItem(fn: (record: IterableChangeRecord<V>) => void): void Parameters fn (record: IterableChangeRecord) => void Returns void

forEachOperation()
Iterate over a set of operations which when applied to the original Iterable will produce the new Iterable.
forEachOperation(fn: (record: IterableChangeRecord<V>, previousIndex: number, currentIndex: number) => void): void Parameters fn (record: IterableChangeRecord, previousIndex: number, currentIndex: number) => void Returns void
NOTE: These are not necessarily the actual operations which were applied to the original Iterable, rather these are a set of computed operations which may not be the same as the ones applied.

forEachPreviousItem()
Iterate over changes in the order of original Iterable showing where the original items have moved.
forEachPreviousItem(fn: (record: IterableChangeRecord<V>) => void): void Parameters fn (record: IterableChangeRecord) => void Returns void

forEachAddedItem()
Iterate over all added items.
forEachAddedItem(fn: (record: IterableChangeRecord<V>) => void): void Parameters fn (record: IterableChangeRecord) => void Returns void

forEachMovedItem()
Iterate over all moved items.
forEachMovedItem(fn: (record: IterableChangeRecord<V>) => void): void Parameters fn (record: IterableChangeRecord) => void Returns void

forEachRemovedItem()
Iterate over all removed items.
forEachRemovedItem(fn: (record: IterableChangeRecord<V>) => void): void Parameters fn (record: IterableChangeRecord) => void Returns void

forEachIdentityChange()
Iterate over all items which had their identity (as computed by the TrackByFunction) changed.
forEachIdentityChange(fn: (record: IterableChangeRecord<V>) => void): void Parameters fn (record: IterableChangeRecord) => void Returns void

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Licensed under the Creative Commons Attribution License 4.0.
https://v7.angular.io/api/core/IterableChanges