observers

问题 How to invoke a method when all the observers have unsubscribed from a subject. Update const alphaStore = new BehaviourSubject(0); observer1 = alphaStore.subscribe(console.log); observer2 = alphaStore.subscribe(console.log); And when all of these observers unsubscribe. I want a method to be invoked. Like... Observer1 unsubscribed Observer2 unsubscribed All observers left 回答1: What you describe already does the finalize() operator. Better said finalize() calls its callback when the chain

问题 I need to automatically create an invoice on an order once it receives the processing status. Which event should be observed in my extension to achieve this? I'm trying but this code is not working, what can it be? .xml in etc/modules <?xml version="1.0"?> <config> <modules> <Atwix_Orderhook> <active>true</active> <codePool>community</codePool> </Atwix_Orderhook> </modules> </config> config.xml in app/code/... <?xml version="1.0"?> <config> <modules> <Atwix_Orderhook> <version>1.0</version> <

问题 I need to automatically create an invoice on an order once it receives the processing status. Which event should be observed in my extension to achieve this? I'm trying but this code is not working, what can it be? .xml in etc/modules <?xml version="1.0"?> <config> <modules> <Atwix_Orderhook> <active>true</active> <codePool>community</codePool> </Atwix_Orderhook> </modules> </config> config.xml in app/code/... <?xml version="1.0"?> <config> <modules> <Atwix_Orderhook> <version>1.0</version> <

问题 I would like to know how an action could be prevented on a model observer, for example: $model->update(['foo' => 'bar']); In the observer public function updating(Model $model) { if($model->isDirty('foo') { // Prevent action from happening } } Thank you in advance. 回答1: You can simply return false. As mentioned in the docs. http://laravel.com/docs/5.6/events#defining-listeners. Sometimes, you may wish to stop the propagation of an event to other listeners. You may do so by returning false

问题 I have some problem in nested fragment in Kotlin. I have nested fragment with ViewModel. After resuming fragment from back button press all observers on viewModel LiveData triggers again although my data does not changed. First i googled and tried for define observer in filed variable and check if it is initialized then do not observer it again: lateinit var observer: Observer fun method(){ if (::observer.isInitialized) return observer = Observer{ ... } viewModel.x_live_data.observe

问题 I have some problem in nested fragment in Kotlin. I have nested fragment with ViewModel. After resuming fragment from back button press all observers on viewModel LiveData triggers again although my data does not changed. First i googled and tried for define observer in filed variable and check if it is initialized then do not observer it again: lateinit var observer: Observer fun method(){ if (::observer.isInitialized) return observer = Observer{ ... } viewModel.x_live_data.observe

问题 I have some problem in nested fragment in Kotlin. I have nested fragment with ViewModel. After resuming fragment from back button press all observers on viewModel LiveData triggers again although my data does not changed. First i googled and tried for define observer in filed variable and check if it is initialized then do not observer it again: lateinit var observer: Observer fun method(){ if (::observer.isInitialized) return observer = Observer{ ... } viewModel.x_live_data.observe

问题 I have some problem in nested fragment in Kotlin. I have nested fragment with ViewModel. After resuming fragment from back button press all observers on viewModel LiveData triggers again although my data does not changed. First i googled and tried for define observer in filed variable and check if it is initialized then do not observer it again: lateinit var observer: Observer fun method(){ if (::observer.isInitialized) return observer = Observer{ ... } viewModel.x_live_data.observe

问题 I have the following code within AppDelegate. The purpose being to create a couple of observers, and then call some code. Once that code completes it then posts a notification, and the observer should then remove both observers and call the completion handler. My issue is that it appears that the observers are not being removed as I expected. The notification is posted, and the NSLog entry is written to console, so I know that the observer is working. However, on the second time of calling,

问题 I have the following code within AppDelegate. The purpose being to create a couple of observers, and then call some code. Once that code completes it then posts a notification, and the observer should then remove both observers and call the completion handler. My issue is that it appears that the observers are not being removed as I expected. The notification is posted, and the NSLog entry is written to console, so I know that the observer is working. However, on the second time of calling,