Difference between revisions of "AngularJS HTTP module"

Revision as of 14:45, 2 January 2017

In AngularJS, the Observable implements the Observer pattern.

Observables are similar to promises.

Observables can be converted to promises using the toPromise method.

Chain the .catch method on an Observable.

Pass in a callback sign a single error argument.

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-In [[AngularJS]], the HTTP Module provides features for communicating with servers via HTTP.
+In [[AngularJS]], the Observable implements the [[Observer pattern]].
-== Description ==
+== Methods ==
-It simplifies usage of the XHR and JSONP APIs.
+* '''.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.
-The HTTP module API conveniently matches RESTful verbs.
+== Compare with promises ==
-It returns an observable object.
+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 ==