# ReduxTrigger

> A small angular service for trigger action when certain conditions occur.
>
> Using the Angular module `@angular-redux/store`.

## Example

**Trigger a list of Redux Action**

```js
// pure selector function
export const shouldLoadResourcesAfterLogin: ConditionTriggerFunc<IAppState> = (state: IAppState): boolean => {
  return !!state.user && !!state.user.id && state.user.id > 0;
}

@NgModule({
...
})
export class AppComponent implements OnInit {

  constructor(private trigger: TriggerService) {}
  
  ngOnInit() {
    this.triggerBulk(shouldLoadResourcesAfterLogin)
      .withActions(ACTION_LOAD_WORKSPACE, ACTION_RESTORE_WORKSPACE, ...);
  }
}
```

**Trigger Action**

```js
export const loadUnreadedMessage: SelectorTriggerFunc<IAppState, number[]> = (state: IAppState) => {
  const messageIdList: number[] = state.messagePool
    .filter((m: IMessage) => m.status === MessageStatus.NEW)
    .map((m: IMessage) => m.id);
  return messageIdList.length === 0 ? null : messageIdList;
};

@NgModule({
...
})
export class AppComponent implements OnInit, OnDestroy {

  private subscription: Subscription = null;

  constructor(private trigger: TriggerService) {}
  
  ngOnInit() {
    this.subscription = this.trigger(loadUnreadedMessage)
      .withAction(ACTION_LOAD_AND_UNREAD_MESSAGE, false); // false -> null values are ignored
  }
  
  ngOnDestroy() {
    this.subscription.unsubscribe();
  }
}
```