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Changes API: How to Subscribe to Operation Changes
The following methods allow you to subscribe to operation changes:
forOperation
Operation changes for one operation can be observed using the forOperationId() method.
Syntax
store.changes().forOperationId(operationId);| Parameters | ||
|---|---|---|
| operationId | number | ID of an operation for which notifications will be processed. |
| Return value | |
|---|---|
| IChangesObservable<OperationStatusChange> | Observable that allows you to add subscriptions to notifications for an operation with a given ID. |
Example
store.changes().forOperationId(operationId)
.on("data", change => {
const operationState = change.state;
// do something
});
forAllOperations
Operations changes for all Operations can be observed using the forAllOperations() method.
| Return Value | |
|---|---|
| IChangesObservable<OperationStatusChange> | Observable that allows to add subscriptions to notifications for all operations. |
Syntax
store.changes().forAllOperations();Example
store.changes().forAllOperations()
.on("data", change => {
console.log("Operation #" + change.operationId);
});
OperationChange
Properties
| Name | Type | Description |
|---|---|---|
| state | object | Operation state |
| operationId | number | Operation ID |
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