subscribe in Angular 2
<p>I want my ngOnInit function do next things:
 - make http request for some data using this.structureRequest.sendRequest(),which works fine,  and after data have been received to start view it using this.viewNodes() function.
I use subscribe , but it does not work, I think I do something wrong with subscribe function. please help:)</p>

<ol>
<li><p>HomeComponent.ts</p>

<pre><code>import {Component} from '@angular/core';
import {Observable} from 'rxjs/Observable';
import {StructureRequestService} from './StructureRequestService';


export class Content {


ok: boolean;
content = [];
}
@Component({
providers: [StructureRequestService],
styleUrls: ['app/home/home.css'],
templateUrl:'./app/home/homePageTemplate.html'

})

export class HomeComponent {
contentArray = [];
myRes: Content;
showAssigned:boolean = false;
showSubitems:boolean = false;
showUsers:boolean = false;

constructor(private structureRequest: StructureRequestService) {}

ngOnInit() {
this.structureRequest.sendRequest().subscribe( this.viewNodes());

}

viewNodes() {
this.myRes = this.structureRequest.result;
this.contentArray = this.myRes.content;
this.showAssigned = true;
 }
 }
</code></pre></li>
</ol>

<p>2.Here is http service, http get works fine, all data received:</p>

<pre><code>import {Injectable} from '@angular/core';
import {Http, Response, Headers, RequestOptions} from '@angular/http';

import {Observable} from 'rxjs/Observable';

@Injectable ()
export class StructureRequestService {
result: Object;
//private myUrl = 'http://manny.herokuapp.com/audit/get/structure';
private myUrl = './app/home/nodes.json';  // local URL to structure APi
constructor (private http: Http) {
    //use XHR object
    let _build = (&lt;any&gt; http)._backend._browserXHR.build;
    (&lt;any&gt; http)._backend._browserXHR.build = () =&gt; {
        let _xhr =  _build();
        _xhr.withCredentials = true;
        return _xhr;
    };
}

sendRequest() {
    let body = JSON.stringify({});
    let headers = new Headers({ 'Content-Type': 'application/json'});
    let options = new RequestOptions({
        headers: headers
    });
     this.http.get(this.myUrl, options)
        .map((res: Response) =&gt; res.json())
        .subscribe(res =&gt; {this.result = res;
            return this.result; });
}
}
</code></pre>

<p>3.so the problem is to make synchronous steps: receive data, than view it. </p>