in typescript How to write http service in function - angular2-routing

Question

Here i know hou to use http service in this way but how can i write service when its in function Like
export class studentController {
GetStudentData() {
constructor(http: Http) {
http.get('api/Employee').subscribe(result => {
this.student = result.json();
})
}
}
export class StudentMastre {
stdID: Number;
stdName: string;
email: string;
Phone: string;
Address: string;
}

Answer 1

You need to make a service to request the data and get, then use the service inside the component to get the data,
Your sample service should be,
#Injectable()
export class CategoryService {
constructor(private http: Http) { }
c(): Observable<StudentMastre[]> {
let wikiUrl = return this.http
.get('api/Employee')
.map(this.extractData)
.catch(this.handleErrors);
}
private extractData(res: Response) {
let data = res.json();
return data;
}
private handleErrors (error: Response | any) {
let errMsg: string;
if (error instanceof Response) {
const body = error.json() || '';
const err = body.error || JSON.stringify(body);
errMsg = `${error.status} - ${error.statusText || ''} ${err}`;
} else {
errMsg = error.message ? error.message : error.toString();
}
console.error(errMsg);
return Observable.throw(errMsg);
}
then in your component,
this.sampleService.
this.categoryService.getCategoriesService().subscribe(students=> {
this.students= students;
}, error => this.errorMessage = error);