70 lines
1.9 KiB
Markdown
70 lines
1.9 KiB
Markdown
@cheatsheetSection
|
|
Directive and component change detection and lifecycle hooks
|
|
@cheatsheetIndex 8
|
|
@description
|
|
(implemented as class methods)
|
|
|
|
@cheatsheetItem
|
|
syntax(js ts):
|
|
`constructor(myService: MyService, ...) { ... }`|`constructor(myService: 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.
|
|
|
|
|
|
@cheatsheetItem
|
|
syntax:
|
|
`ngOnChanges(changeRecord) { ... }`|`ngOnChanges(changeRecord)`
|
|
description:
|
|
Called after every change to input properties and before processing content or child views.
|
|
|
|
|
|
@cheatsheetItem
|
|
syntax:
|
|
`ngOnInit() { ... }`|`ngOnInit()`
|
|
description:
|
|
Called after the constructor, initializing input properties, and the first call to ngOnChanges.
|
|
|
|
|
|
@cheatsheetItem
|
|
syntax:
|
|
`ngDoCheck() { ... }`|`ngDoCheck()`
|
|
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.
|
|
|
|
|
|
@cheatsheetItem
|
|
syntax:
|
|
`ngAfterContentInit() { ... }`|`ngAfterContentInit()`
|
|
description:
|
|
Called after ngOnInit when the component's or directive's content has been initialized.
|
|
|
|
|
|
@cheatsheetItem
|
|
syntax:
|
|
`ngAfterContentChecked() { ... }`|`ngAfterContentChecked()`
|
|
description:
|
|
Called after every check of the component's or directive's content.
|
|
|
|
|
|
@cheatsheetItem
|
|
syntax:
|
|
`ngAfterViewInit() { ... }`|`ngAfterViewInit()`
|
|
description:
|
|
Called after ngAfterContentInit when the component's view has been initialized. Applies to components only.
|
|
|
|
|
|
@cheatsheetItem
|
|
syntax:
|
|
`ngAfterViewChecked() { ... }`|`ngAfterViewChecked()`
|
|
description:
|
|
Called after every check of the component's view. Applies to components only.
|
|
|
|
|
|
@cheatsheetItem
|
|
syntax:
|
|
`ngOnDestroy() { ... }`|`ngOnDestroy()`
|
|
description:
|
|
Called once, before the instance is destroyed.
|