Hi Arnaud,
Thanks for your reply but this appears to be very complex for me . I am
unable to chain my request.
my first call -
getsession() in below format
{
"error": null,
"sessionID": "XXXXXXXX"
}
I need to pick the session ID and then call othe function
getInformation ( sessionID from above response).
I tried to do the following thing but does not work as I get compile time
error
this.service.getSession().pipe(
switchMap(data =>{
let session = data.sessionID;
this.serice.getinformation(session );
})
)
I really need correct syntax for it. I struggled with all video from
YouTube but no understanding.
Regards
Sandeep Shukla
On Wednesday, October 21, 2020 at 2:17:53 PM UTC+2 Arnaud Deman wrote:
> Hi Sandeep,
>
> The calls to the backend are actually returning Observables. This is
> asynchronous, so the second call is probably done before the first
> Observable has emitted a value. You can combine the two observables like I
> said in my previous answer. Another solution could be to perform the second
> call in the subscribe of the first one. If this diagnostic is not correct
> perhaps could you provide an minimalist stackblitz or equivalent.
>
> Regards,
> Arnaud.
>
> On Tuesday, 20 October 2020 at 19:28:15 UTC+2 sandeep...@gmail.com wrote:
>
>> Hi Arnaud,
>> Thanks for your response.
>> I did not understand it completely. The moment I call method in
>> subsequent request session becomes undefined. Here is the code I am
>> attaching.
>>
>> sessionId : string = "";
>>
>> this.loginService.getSession(t)
>> .subscribe(data => {
>> this.result=JSON.parse(JSON.stringify(data));
>> sessionId = this.result;
>> }, error => {
>> this.result = JSON.stringify(error).toString();
>> });
>> // I only want to return result from below method to consumer while
>> session is created in each request. I cannot store sessionId from
>> //getSession. I am not sure how to combine them
>> this.loginService.searchDocument(this.sessionId , bodymsg)
>> .subscribe(data => {
>> this.result=JSON.parse(JSON.stringify(data));
>> }, error => {
>> this.result = JSON.stringify(error).toString();
>> });
>>
>>
>>
>> Regards
>> Sandeep Sjhukla
>>
>> On Tue, Oct 20, 2020 at 11:40 AM Arnaud Deman <arnaud...@io.cool> wrote:
>>
>>> Hello Sandeep,
>>> Assuming the backend calls return Observables, you could do something
>>> like this (untested):
>>> getSession (). pipe (
>>> mergeMap (sessions => getInformation (session))
>>> );
>>>
>>> This would return an Observable of the same type as getInformation
>>> (session).
>>>
>>> Regards,
>>> Arnaud.
>>>
>>>
>>> On Monday, 19 October 2020 at 11:35:49 UTC+2 sandeep...@gmail.com wrote:
>>>
>>>> Hi,
>>>>
>>>> I would like to call an service in which I need a session value. I dont
>>>> want customer to enter the login details to create the session rather on
>>>> page load itself I would like to provide the details.
>>>>
>>>> 1) var session = getSession(); // rest call from backend
>>>>
>>>> 2) var info = getInformation (session) ; //rest call from backend
>>>>
>>>> 3) return infor to cleint
>>>>
>>>> I would like to know how I can do it with one call. It does not work
>>>> for me.
>>>>
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>>
>>
>> --
>> Regards
>> Sandeep Shukla,
>> Mobile# +31647969951 <+31%206%2047969951>
>>
>
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