@angular-util/http
v0.1.0
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Http Utilities Angular2 apps
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Angular 2 HTTP Utilities
This is the home of angular2 http, a collection of utility classes for http related services. All of these services are collected from different open source projects
Getting started
npm install @angular-util/http --save
HttpService class
HttpService
is a wrapper around angular's Http
with same API as Http
. HttpService provides options to intercept request, response and response error. This class is directly lifted from https://github.com/Teradata/covalent.git
To add a desired interceptor, it needs to implement the [HttpInterceptor] interface.
export interface HttpInterceptor {
onRequest?: (requestOptions: RequestOptionsArgs) => RequestOptionsArgs;
onResponse?: (response: Response) => Response;
onResponseError?: (error: Response) => Response;
}
Every method is optional, so you can just implement the ones that are needed.
Example:
import { Injectable } from '@angular/core';
import { HttpInterceptor } from '@covalent/http';
@Injectable()
export class CustomInterceptor implements HttpInterceptor {
onRequest(requestOptions: RequestOptionsArgs): RequestOptionsArgs {
... // do something to requestOptions
return requestOptions;
}
onResponse(response: Response): Response {
... // check response status and do something
return response;
}
onResponseError(error: Response): Response {
... // check error status and do something
return error;
}
}
Also, you need to bootstrap the interceptor providers
@NgModule({
declarations: [
...
],
imports: [
...
],
exports: [
...
]
})
export class SharedModule {
static forRoot(): ModuleWithProviders {
return {
ngModule: SharedModule,
providers: [
provideHttpService([CustomInterceptor])
]
};
}
}
After that, just inject [HttpService] and use it for your requests.
Resource class
Resource
class provides convinient access to your restful backend service. You will need to extend Resource
class to create a service to access your backend. All methods return a Observable
@Injectable()
@ResourceConfig({url: '/api/users'})
export class UserResource extends Resource<User> {
constructor(http: HttpService) {
super(http);
}
}
A simple UserResource
defined above will give you access to the following methods.
Default methods (available for free)
Result is always converted to JSON by default, so if your backend service returns JSON you don't have to map result to json.
findOne
Signature: findOne(@Path('id') id: string|number): Observable<T>
Target URL: GET /api/users/{id}
Usage:
userResource.findOne(12)
.subscribe(
res => {
// Do something with success response
},
err => {
// Do something with error
});
save
Signature: save(body: any): Observable<T>
Target URL: POST /api/users
Usage:
userResource.save(someUserObject)
.subscribe( ... );
update
Signature: update(id: string|number, body: any): Observable<T>
Target URL: PUT /api/users/{id}
Usage:
userResource.update(12, someUserObject)
.subscribe( ... );
delete
Signature: delete(id: string|number): Observable<T>
Target URL: DELETE /api/users/{id}
Usage:
userResource.delete(12)
.subscribe(...);
find
Signature: update(id: string|number, body: any): Observable<T>
This method can be used for query and search screens
Target URL: GET /api/users
Usage:
userResource.find(someQueryObject)
.subscribe( ... );
Adding extension methods
The code below shows how to extend UserResource
with a new method to query roles for a user
@Injectable()
@ResourceConfig({url: '/api/users'})
export class UserResource extends Resource<User> {
constructor(http: HttpService) {
super(http);
}
@GET('/{id}/roles')
findRoles(@Path('id') id:number): Observable<List<Role>>> {
return null; // Return null as actual return is handled by @GET decorator
}
}
Now you can use this new method as
userResource.findRoles(12)
.subscribe( ... );