Difference between revisions of "AngularJS observable"
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Revision as of 15:47, 2 January 2017
In AngularJS, the Observable implements the Observer pattern.
Methods
- .subscribe = start and listen to an observable stream.
- .onNext = called when new data arrives.
- .onError = called when error is thrown.
- .onComplete = called when stream is completed.
Compare with promises
Observables are similar to promises.
toPromise
Observables can be converted to promises using the toPromise method.
Error handling
Chain the .catch method on an Observable.
Pass in a callback sign a single error argument.
See also
External links
- Structural Directives @ angular.io
