javascript - AngularJS - Store data within services? -


suppose have users service calls external api

in order avoid calling api twice (e.g. once parent page, , again child elements need it).

would ok store data within service?

e.g. myservice.username, myservice.userid, etc.

i've read it's bad practice store data in services; why i'm asking

note: not need data persist. should refresh upon page load.

i think caching data in service has several advantages, must aware however, happening.

here few facts , infos regarding services:

  • they singletons, meaning there 1 instance in whole application
  • a service there (you don't need create explicitly)
  • a service can cache data can usefull, e.g. maintain state of view/page and/or reduce amount of requests sent server
  • services can used exchange data between different components (e.g. directives, controllers, other services, etc.)
  • services can injected ever need them
  • services can tested without ui-related issues..

in cases might need pay attention tough:

  • if different components share , modify same service, might "mess" each others data - can desired, might have side-effects
  • services cache long application "lives", i.e. if user reloads or revisits page, data/state lost. if want persist data, can store service's data in local storage example.

i think service if has clear, understandable api , doesn't try much. , if can reused several compontents, seems case requirements.

please note of copied answer in different post regarding services vs. directive. maybe can find more info there.


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