Changing AsyncValidator's response in angular 4

Question

AsyncValidators requires Observable as retrun type. http request is Observale but my server returns true or false not {uniqeTitle:true} or null value as angular wants.

I have to create my own observable... with no luck.

Here what I have

static uniqeTitle(fieldControl: FormControl): Observable<any> {
    const subject = new Subject<any>();
    apiService.get('online-validation/')
        .subscribe(resp => {
            subject.next(resp?null:{uniqueTitle:true});
        });
    return subject;
}

Edit: I need complete!

Günter Zöchbauer · Accepted Answer · 2017-08-04 13:13:15Z

1

Just use map to transform the value and return the mapped observable instead of creating a new one:

static uniqeTitle(fieldControl: FormControl): Observable<any> {

    return apiService.get('online-validation/')
        .map(resp => {
            return resp?null:{uniqueTitle:true});
        });

}

answered Aug 4, 2017 at 13:13

Günter Zöchbauer

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