javascript - Angular http post to return data back through service to component -


i want return data (@@identity) sql server through service component

the web api being called , sending data back.

however, since new angular 2/4 ( used angular 1 ) return on service , , set variable or object caller.

currently doing

component

this.trackerformservice.addsession();  // current

but since value single id, 5, shouldn't create in typescript retrieve it?

this.myid = this.trackerformservice.addsession();    // ???

then in service 

private _url = 'http://localhost:60696/api/tracker';  addsession() {      let headers = new headers({ 'content-type': 'application/json' });     let options = new requestoptions({ headers: headers });     this.http.post(this._url, json.stringify({}), options).catch(this.handleerror).subscribe();  }

now above pass id service (addsession() method component, shouldn't return ?

return this.http.post(this._url, json.stringify({}), options).catch(this.handleerror).subscribe();

but work?

web api (.net core ) looks 

return created($"api/sessiontrackers/{sessiontracker.id}", sessiontracker);

this surely making post call web api

https://dheerajsroy.wixsite.com/dheerajkumar/single-post/2017/09/07/how-to-make-post-call-in-angular-2

in service

 return this.http.post(url, json.stringify(data), requestoptions)               .map((response: response) => response.json())

in component

this.service.addsession(this.data).subscribe(       data => { console.log(data) // data returned call       },       error => { console.log(error); // error if       },       ()=> // here call completed. if wish        // after call completed(since asynchronous call), right place do. ex: call function     )

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