ItemUpdateExt extension

on

Methods

forEachChangedField(void callback(String? fieldName, int fieldPosition, String? value)) → void

Available on ItemUpdate, provided by the ItemUpdateExt extension

Receives an iterator function and invokes it once per each field such that ItemUpdate.isValueChanged is true.
forEachField(void callback(String? fieldName, int fieldPosition, String? value)) → void

Available on ItemUpdate, provided by the ItemUpdateExt extension

Receives an iterator function and invokes it once per each field in the Subscription.
getItemName() → String?

Available on ItemUpdate, provided by the ItemUpdateExt extension

Inquiry method that retrieves the name of the item to which this update pertains.
getItemPos() → int

Available on ItemUpdate, provided by the ItemUpdateExt extension

Inquiry method that retrieves the position in the "Item List" or "Item Group" of the item to which this update pertains.
getValue(StringOrInt fieldNameOrPosition) → String?

Available on ItemUpdate, provided by the ItemUpdateExt extension

Returns the current value for the specified field.
getValueAsJSONPatchIfAvailable(StringOrInt fieldNameOrPosition) → Object?

Available on ItemUpdate, provided by the ItemUpdateExt extension

Inquiry method that gets the difference between the new value and the previous one as a JSON Patch structure, provided that the Server has used the JSON Patch format to send this difference, as part of the "delta delivery" mechanism.
isSnapshot() → bool

Available on ItemUpdate, provided by the ItemUpdateExt extension

Inquiry method that asks whether the current update belongs to the item snapshot (which carries the current item state at the time of Subscription).
isValueChanged(StringOrInt fieldNameOrPosition) → bool

Available on ItemUpdate, provided by the ItemUpdateExt extension

Inquiry method that asks whether the value for a field has changed after the reception of the last update from the Server for an item.