An Overview of Angular Lifecycle Hooks

Posted By : Priyanka Yadav | 29-Dec-2021



The Angular model has a life cycle that begins when the Angular confirms the initial phase of the component  and provides a component view and perspective of its child component. The life cycle continues with the discovery of change, as Angular checks to see when features tied to the data change, and updates both view and partial events as needed. The life cycle ends when Angular destroys a component event and removes its provided template from DOM. Guides have the same life cycle, as Angular creates, updates, and destroys events during operation.


Your app can use the life cycle tricks to get into important events in the partial life cycle or instruction to initiate new situations, initiate change as needed, respond to updates during discovery, and clean up before removal. 


Learning purpose of angular lifecycle hooks. 


1. Understand the different stages of the Angular part that passes from creation to destruction. 


2. Know how to get into those categories and use your code. 


3. Know the sequence of events in different stages and what causes each stage. 


Different phases of a component. 


  • The Angular component has a life cycle, the number of different stages it passes from birth to death.
  • We can go into those different categories to get the best control of our app.
  • To do this we add certain methods to our class called each of these stages of the life cycle, which we call hooks.


Hooks are manufactured as follows:- 


                                                       constructor    --->


                                      --->          ngonchanges    --->


                                      --->           ngOnint          --->


                                       --->          ngDoCheck      ---> 


                                       --->         ngAfterContentinit --->


                                       --->          ngAfterContentChecked  ---> 


                                       --->          ngafterViewinit          --->


                                      --->            ngAfterViewChecked    --->


                                       --->            ngOnDestroy       




  • constructor :- 


This is requested when Angular creates a section or instructions for calling new ones to the class.  


  • ngonchanges:- 


It is always requested if there is a change in one component feature.  


  • ngOnint:- 


The requested portion when given is already started.This hook is called only once after the first OnChanges . 


  • ngDoCheck :- 


Requested when using a replacement partitioner. It allows us to use our algorithm to detect changes in a given component.  


  •  ngAfterContentinit:- 


This method will be used just before Angular destroys part.Use this hook to remove yourself from the list of objects and remove event holders to avoid memory leaks.  


  •  ngAfterContentChecked:- 


Requested each time the content of a given component is evaluated to determine the Angular transition method. 


  •  ngafterViewinit :-  


Requested when partial viewing is fully implemented.  


  •  ngAfterViewChecked:- 


Requested each time a view of a given component is tested to determine the Angular transition method. 


  •  ngOnDestroy :- 


Cleaning just before Angular destroys discipline or part. Unsubscribe and remove event holders to prevent memory leaks


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