Noteservice
BiggerPockets Wealth Magazine. Written by financial journalists and data scientists, get 60+ pages of newsworthy content, expert-driven advice, and data-backed research written in a clear way to help you navigate your tough investment decisions in an ever-changing financial climate! Angular Service and How to Inject A Service in Angular August 14, 2019 2 minute read Menu. What is a service in Angular; How to inject a service.
- 1.Angular 2 Notes - Modules
- 1.1.API Service
- 1.2.State Management
Angular 2 Notes - Modules
API Service
- First, configure the application to use server communication facilities.
The Angular Http client communicates with the server using a familiar HTTP request/response protocol. The Http client is one of a family of services in the Angular HTTP library.
E.g., main.ts
When importing from the @angular/http module, SystemJS knows how to load services from the Angular HTTP library because the systemjs.config.js file maps to that module name.
JsonpModule isn’t necessary for plain HTTP.
Make a General Service
E.g.,api.ts
In fact, the http.get method returns an Observable of HTTP Responses (Observable
- Export providers
E.g.,../index.ts
- Export services
E.g.,../services/index.ts
Implement a service
E.g.,note.ts
Apply a service
E.g.,notes.ts
This is a best practice. Components are easier to test and debug when their constructors are simple, and all real work (especially calling a remote server) is handled in a separate method.
To listen for events in this stream, subscribe to the Observable (Here, we have translated the obserable to json). These subscriptions specify the actions to take when the web request produces a success event (with the data in the event payload) or a fail event (with the error in the payload).
Promise Based
We can follow the promise then(this.extractData).catch(this.handleError) pattern as in this example.
While promises may be more familiar, observables have many advantages.
Alternatively, you can call toPromise(success, fail). The observable’s map callback moves to the first success parameter and its catch callback to the second fail parameter in this pattern: .toPromise(this.extractData, this.handleError).
Also, We have to adjust the calling component to expect a Promise instead of an observable:
The less obvious but critical difference is that these two methods return very different results.
The promise-based then returns another promise. You can keep chaining more then and catch calls, getting a new promise each time.
The subscribe method returns a Subscription. A Subscription is not another Observable. It’s the end of the line for observables. You can’t call map on it or call subscribe again. The Subscription object has a different purpose, signified by its primary method, unsubscribe.
Observalbe Based*
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ConceptObservable in short addresses asynchronous processing and events. Comparing to promise, it can be described as observable = promise + events.
What is great with observables is that they are lazy. Observables can be canceled and you can apply some operators in them (like map, filter, …). This allows to handle asynchronous things in a very flexible way.
A great sample describing the strong power of observables is the way to connect a filter input to a corresponding filtered list. When the user enters characters, the list is refreshed. Observables handle corresponding AJAX requests and cancel previous in progress requests if another one is triggered by new value in the input. E.g.,
In action
- Manage the observable by your own. In this case, call the
subscribemethod on the observable and assign the result into an attribute of the component. Then use this attribute in the view to iterate over the collection:
Returns from both get and map methods are the observable not the result (in the same way than with promises).
- Manage the observable by the Angular template. You can also use the a pipe to implicitly manage the observable. In this case, there is no need to explicitly call the subscribe method.
Note that observables are lazy. So the corresponding HTTP request will be only called once when a listener attached on it is using the subscribe method.
The map method is used to extract the JSON content from the response and use it in the observable processing.
State Management
Make a Store
Noteservice Wind Ensemble
e.g., store.ts
Make a Store-Helper
e.g., store-helper.ts
Implement a Store
In container note.ts,
In service note.ts, keep the store up-to-date.
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