observable

问题 I've found this example of a service to get the IP-Address. This service returns an Observable<Object> , which I would like to assign/save to a String-Variable. getIpAddress() { return this.http .get('https://api.ipify.org/?format=json') .pipe( catchError(this.handleError) ); } I'm still not well "trained" with Observables. I've injected this Service to my own Service (an Authentication Service) where I'm trying to access the actual value, which would be a string. I know I'll have to

问题 There are three buttons: Clicking the first Request HTTP Data As Promise button gets its HTTP response as a Promise . The second Request HTTP Data As Observable button gets its response as an Observable . Both these buttons get their responses using asynchronous response mechanism. Now, I would like the third Request HTTP Data and Wait button to get a synchronous response. I would like it to wait for the http service to return the HTTP response. How could it be done? Here is the link to the

问题 There are three buttons: Clicking the first Request HTTP Data As Promise button gets its HTTP response as a Promise . The second Request HTTP Data As Observable button gets its response as an Observable . Both these buttons get their responses using asynchronous response mechanism. Now, I would like the third Request HTTP Data and Wait button to get a synchronous response. I would like it to wait for the http service to return the HTTP response. How could it be done? Here is the link to the

问题 I have a service where I have a method getting called every 30 seconds automatically. I also have a button which will allow a user to reset the timer, preventing this method from getting called for another 30 seconds. How can I reset my timer so this method won't get called within that 30 seconds if the button is clicked? COMPONENT constructor(private service: Service) { this.service.initialize(); } refreshTimer(): void { this.service.refreshTimer(); } SERVICE initialize(): void { timer(0,

问题 I wish to transfere my old app to MVVM, so can you please help me with this test: Shared ViewModel: class SharedViewModel : ViewModel() { private var _numberF1 = MutableLiveData<Int>().apply { postValue(0)} val numberF1: LiveData<Int> get() = _numberF1 fun addNumberF1() { _numberF1.value = _numberF1.value?.plus(1) } } Fragment: class Fragment1 : Fragment() { companion object { fun newInstance() = Fragment1() } private lateinit var viewModel: SharedViewModel override fun onCreateView(inflater:

问题 I wish to transfere my old app to MVVM, so can you please help me with this test: Shared ViewModel: class SharedViewModel : ViewModel() { private var _numberF1 = MutableLiveData<Int>().apply { postValue(0)} val numberF1: LiveData<Int> get() = _numberF1 fun addNumberF1() { _numberF1.value = _numberF1.value?.plus(1) } } Fragment: class Fragment1 : Fragment() { companion object { fun newInstance() = Fragment1() } private lateinit var viewModel: SharedViewModel override fun onCreateView(inflater:

问题 I wish to transfere my old app to MVVM, so can you please help me with this test: Shared ViewModel: class SharedViewModel : ViewModel() { private var _numberF1 = MutableLiveData<Int>().apply { postValue(0)} val numberF1: LiveData<Int> get() = _numberF1 fun addNumberF1() { _numberF1.value = _numberF1.value?.plus(1) } } Fragment: class Fragment1 : Fragment() { companion object { fun newInstance() = Fragment1() } private lateinit var viewModel: SharedViewModel override fun onCreateView(inflater:

问题 I have a resolver that needs to fetch data from two dependant Apis before the page is loaded. The second call is defined by the result of the first one, so I try to chain the two observables and need to return the second one at the end of the resolver. Before I tried to chain the observables I had: resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<MySecondObservable> { const observable1 = this.myService.getFirstDataSet(); observable1.subscribe( firstDataSet =>

问题 The view contains the element: <div *ngIf="showMe">Hello</div> When calling the component method: downloadDemo(): void { this.download$ = this.downloadService.downloadUrlAsBlobWithProgressAndSaveInFile('assets/skypeforlinux-64.deb', 'demo') this.download$.subscribe((download: Download) => { this.showMe = true; console.log('Progress: ' + download.progress); }) } the element shows in the view before all the Progress loggers. And that is how it should be. This HTTP based downloading works just

问题 The view contains the element: <div *ngIf="showMe">Hello</div> When calling the component method: downloadDemo(): void { this.download$ = this.downloadService.downloadUrlAsBlobWithProgressAndSaveInFile('assets/skypeforlinux-64.deb', 'demo') this.download$.subscribe((download: Download) => { this.showMe = true; console.log('Progress: ' + download.progress); }) } the element shows in the view before all the Progress loggers. And that is how it should be. This HTTP based downloading works just