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