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mosh-angular-http's Introduction

  1. HTTP Client
  • First, we need to import http module into our module provider
  • We do HTTP dependency injection inside our component constructor
  • We call the get api and we use subscribe for the callback
  1. POST API
  • we add a template variable to the input field, the element is actuall a HTMLInputElement type
  • we a private inside the argument of a method, means we declare it as a field
  1. Oninit

  • Constructor shouldn't perform expensive operation

  • Angular has lifecycle hooks,

    • creates a compoenent (Oninit- it will called when a component is initialized)
    • renders it
    • creates and renders its children

  • Example of Lifecycles hook

    • OnInit
    • OnChanges
    • DoCheck
    • AfterContentInit
    1. Unexpected Error
    • Server is offline
    • Network is down
    • Unhandled exceptions
    1. Expected
    • "Not found" errors(404)
    • "Bad request" errors(400)

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