On Monday, March 6, 2017 at 8:41:22 PM UTC-8, Sander Elias wrote:
>
> Hi Celerity,
>
> If you want synchronous results, you need to use native JS, as Angular
> doesn't provide that.
> However, you can easily string multiple async calls together.
>
> might look like this:
> import { Injectable } from '@angular/core';
> import { Http, Headers, Response } from '@angular/http';
>
> @Injectable()
> export class ServiceNameService {
>
> constructor(private http:Http) { }
>
> getResult() {
> return this.firststep()
> .map(this.secondstep)
> .map(this.thirthstep)
> .subscribe(data => {
> /* all data is available here */
> });
> }
>
> firststep() {
> return this.http.get('url')
> .map((response: Response) => response.json())
> .map(data => ({firstep: data}))
> ;
> }
>
> secondstep(data) {
> /* use data to prepare call */
> return this.http.get('url')
> .map((response: Response) => response.json())
> .map((r) => data.secondStep = r);
> }
>
> thirthstep(data) {
> /* use data to prepare call */
> return this.http.get('url')
> .map((response: Response) => response.json())
> .map((r) => data.thirthStep = r);
> }
>
> }
>
> Hope this helps you a bit,
> Regards
> Sander
>
> Hi Sander,
>
I get error in the call of *.**map(this.secondstep) **in the
GetResult method*
EXCEPTION: Cannot read property 'get' of undefined
As you see below, call to
>
> * this.getUserGroups() works but when calling *
>
> * .map(this.getUserProps) it fails*
>>>
>>>
>>> * IsEditable() { console.log("IsEditable ..."); return
>> this.getUserGroups() .map(this.getUserProps)
>> .subscribe(data => { /* all data is available here */
>> console.log("Is Editable ... " + JSON.stringify(data))
>> }); } getUserProps(data) { console.log("getUserProps ...");
>> let header = new Headers(); header.append("Content-Type",
>> "application/json; odata=verbose"); header.append("Accept",
>> "application/json; odata=verbose"); return this.http.get(this._url,
>> { headers: header }).map((response: Response) =>
>> response.json()) .map((r) => data.getUserProps = r); }*
>
>
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