2.8 KiB
@cheatsheetSection Directive and component change detection and lifecycle hooks @cheatsheetIndex 9 @description {@target ts dart}(implemented as class methods){@endtarget} {@target js}(implemented as component properties){@endtarget}
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syntax(ts):
constructor(myService: MyService, ...) { ... }|constructor(myService: MyService, ...)
syntax(js):
constructor: function(MyService, ...) { ... }|constructor: function(MyService, ...)
syntax(dart):
MyAppComponent(MyService myService, ...) { ... }|MyAppComponent(MyService myService, ...)
description:
The class constructor is called before any other lifecycle hook. Use it to inject dependencies, but avoid any serious work here.
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syntax(ts dart):
ngOnChanges(changeRecord) { ... }|ngOnChanges(changeRecord)
syntax(js):
ngOnChanges: function(changeRecord) { ... }|ngOnChanges: function(changeRecord)
description:
Called after every change to input properties and before processing content or child views.
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syntax(ts dart):
ngOnInit() { ... }|ngOnInit()
syntax(js):
ngOnInit: function() { ... }|ngOnInit: function()
description:
Called after the constructor, initializing input properties, and the first call to ngOnChanges.
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syntax(ts dart):
ngDoCheck() { ... }|ngDoCheck()
syntax(js):
ngDoCheck: function() { ... }|ngDoCheck: function()
description:
Called every time that the input properties of a component or a directive are checked. Use it to extend change detection by performing a custom check.
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syntax(ts dart):
ngAfterContentInit() { ... }|ngAfterContentInit()
syntax(js):
ngAfterContentInit: function() { ... }|ngAfterContentInit: function()
description:
Called after ngOnInit when the component's or directive's content has been initialized.
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syntax(ts dart):
ngAfterContentChecked() { ... }|ngAfterContentChecked()
syntax(js):
ngAfterContentChecked: function() { ... }|ngAfterContentChecked: function()
description:
Called after every check of the component's or directive's content.
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syntax(ts dart):
ngAfterViewInit() { ... }|ngAfterViewInit()
syntax(js):
ngAfterViewInit: function() { ... }|ngAfterViewInit: function()
description:
Called after ngAfterContentInit when the component's view has been initialized. Applies to components only.
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syntax(ts dart):
ngAfterViewChecked() { ... }|ngAfterViewChecked()
syntax(js):
ngAfterViewChecked: function() { ... }|ngAfterViewChecked: function()
description:
Called after every check of the component's view. Applies to components only.
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syntax(ts dart):
ngOnDestroy() { ... }|ngOnDestroy()
syntax(js):
ngOnDestroy: function() { ... }|ngOnDestroy: function()
description:
Called once, before the instance is destroyed.