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# Cheat Sheet
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< th > Bootstrapping< / th >
< th > < p > < code > import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';< / code >
< / p >
< / th >
< / tr >
< tr >
< td > < code > < b > platformBrowserDynamic().bootstrapModule< / b > (AppModule);< / code > < / td >
< td > < p > Bootstraps the app, using the root component from the specified < code > NgModule< / code > . < / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > NgModules< / th >
< th > < p > < code > import { NgModule } from '@angular/core';< / code >
< / p >
< / th >
< / tr >
< tr >
< td > < code > @< b > NgModule< / b > ({ declarations: ..., imports: ...,< br > exports: ..., providers: ..., bootstrap: ...})< br > class MyModule {}< / code > < / td >
< td > < p > Defines a module that contains components, directives, pipes, and providers.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > declarations:< / b > [MyRedComponent, MyBlueComponent, MyDatePipe]< / code > < / td >
< td > < p > List of components, directives, and pipes that belong to this module.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > imports:< / b > [BrowserModule, SomeOtherModule]< / code > < / td >
< td > < p > List of modules to import into this module. Everything from the imported modules
is available to < code > declarations< / code > of this module.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > exports:< / b > [MyRedComponent, MyDatePipe]< / code > < / td >
< td > < p > List of components, directives, and pipes visible to modules that import this module.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > providers:< / b > [MyService, { provide: ... }]< / code > < / td >
< td > < p > List of dependency injection providers visible both to the contents of this module and to importers of this module.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > bootstrap:< / b > [MyAppComponent]< / code > < / td >
< td > < p > List of components to bootstrap when this module is bootstrapped.< / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > Template syntax< / th >
< th > < / th >
< / tr >
< tr >
< td > < code > < input < b > [value]< / b > ="firstName"> < / code > < / td >
< td > < p > Binds property < code > value< / code > to the result of expression < code > firstName< / code > .< / p >
< / td >
< / tr > < tr >
< td > < code > < div < b > [attr.role]< / b > ="myAriaRole"> < / code > < / td >
< td > < p > Binds attribute < code > role< / code > to the result of expression < code > myAriaRole< / code > .< / p >
< / td >
< / tr > < tr >
< td > < code > < div < b > [class.extra-sparkle]< / b > ="isDelightful"> < / code > < / td >
< td > < p > Binds the presence of the CSS class < code > extra-sparkle< / code > on the element to the truthiness of the expression < code > isDelightful< / code > .< / p >
< / td >
< / tr > < tr >
< td > < code > < div < b > [style.width.px]< / b > ="mySize"> < / code > < / td >
< td > < p > Binds style property < code > width< / code > to the result of expression < code > mySize< / code > in pixels. Units are optional.< / p >
< / td >
< / tr > < tr >
< td > < code > < button < b > (click)< / b > ="readRainbow($event)"> < / code > < / td >
< td > < p > Calls method < code > readRainbow< / code > when a click event is triggered on this button element (or its children) and passes in the event object.< / p >
< / td >
< / tr > < tr >
< td > < code > < div title="Hello < b > {{ponyName}}< / b > "> < / code > < / td >
< td > < p > Binds a property to an interpolated string, for example, "Hello Seabiscuit". Equivalent to:
< code > < div [title]="'Hello ' + ponyName"> < / code > < / p >
< / td >
< / tr > < tr >
< td > < code > < p> Hello < b > {{ponyName}}< / b > < /p> < / code > < / td >
< td > < p > Binds text content to an interpolated string, for example, "Hello Seabiscuit".< / p >
< / td >
< / tr > < tr >
< td > < code > < my-cmp < b > [(title)]< / b > ="name"> < / code > < / td >
< td > < p > Sets up two-way data binding. Equivalent to: < code > < my-cmp [title]="name" (titleChange)="name=$event"> < / code > < / p >
< / td >
< / tr > < tr >
< td > < code > < video < b > #movieplayer< / b > ...> < br > < button < b > (click)< / b > ="movieplayer.play()"> < br > < /video> < / code > < / td >
< td > < p > Creates a local variable < code > movieplayer< / code > that provides access to the < code > video< / code > element instance in data-binding and event-binding expressions in the current template.< / p >
< / td >
< / tr > < tr >
< td > < code > < p < b > *myUnless< / b > ="myExpression"> ...< /p> < / code > < / td >
< td > < p > The < code > *< / code > symbol turns the current element into an embedded template. Equivalent to:
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< code > < ng-template [myUnless]="myExpression"> < p> ...< /p> < /ng-template> < / code > < / p >
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< / td >
< / tr > < tr >
< td > < code > < p> Card No.: < b > {{cardNumber | myCardNumberFormatter}}< / b > < /p> < / code > < / td >
< td > < p > Transforms the current value of expression < code > cardNumber< / code > via the pipe called < code > myCardNumberFormatter< / code > .< / p >
< / td >
< / tr > < tr >
< td > < code > < p> Employer: < b > {{employer?.companyName}}< / b > < /p> < / code > < / td >
< td > < p > The safe navigation operator (< code > ?< / code > ) means that the < code > employer< / code > field is optional and if < code > undefined< / code > , the rest of the expression should be ignored.< / p >
< / td >
< / tr > < tr >
< td > < code > < < b > svg:< / b > rect x="0" y="0" width="100" height="100"/> < / code > < / td >
< td > < p > An SVG snippet template needs an < code > svg:< / code > prefix on its root element to disambiguate the SVG element from an HTML component.< / p >
< / td >
< / tr > < tr >
< td > < code > < < b > svg< / b > > < br > < rect x="0" y="0" width="100" height="100"/> < br > < /< b > svg< / b > > < / code > < / td >
< td > < p > An < code > < svg> < / code > root element is detected as an SVG element automatically, without the prefix.< / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > Built-in directives< / th >
< th > < p > < code > import { CommonModule } from '@angular/common';< / code >
< / p >
< / th >
< / tr >
< tr >
< td > < code > < section < b > *ngIf< / b > ="showSection"> < / code > < / td >
< td > < p > Removes or recreates a portion of the DOM tree based on the < code > showSection< / code > expression.< / p >
< / td >
< / tr > < tr >
< td > < code > < li < b > *ngFor< / b > ="let item of list"> < / code > < / td >
< td > < p > Turns the li element and its contents into a template, and uses that to instantiate a view for each item in list.< / p >
< / td >
< / tr > < tr >
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< td > < code > < div < b > [ngSwitch]< / b > ="conditionExpression"> < br > < ng-template < b > [< b > ngSwitchCase< / b > ]< / b > ="case1Exp"> ...< /ng-template> < br > < ng-template < b > ngSwitchCase< / b > ="case2LiteralString"> ...< /ng-template> < br > < ng-template < b > ngSwitchDefault< / b > > ...< /ng-template> < br > < /div> < / code > < / td >
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< td > < p > Conditionally swaps the contents of the div by selecting one of the embedded templates based on the current value of < code > conditionExpression< / code > .< / p >
< / td >
< / tr > < tr >
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< td > < code > < div < b > [ngClass]< / b > ="{'active': isActive, 'disabled': isDisabled}"> < / code > < / td >
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< td > < p > Binds the presence of CSS classes on the element to the truthiness of the associated map values. The right-hand expression should return {class-name: true/false} map.< / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > Forms< / th >
< th > < p > < code > import { FormsModule } from '@angular/forms';< / code >
< / p >
< / th >
< / tr >
< tr >
< td > < code > < input < b > [(ngModel)]< / b > ="userName"> < / code > < / td >
< td > < p > Provides two-way data-binding, parsing, and validation for form controls.< / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > Class decorators< / th >
< th > < p > < code > import { Directive, ... } from '@angular/core';< / code >
< / p >
< / th >
< / tr >
< tr >
< td > < code > < b > @Component({...})< / b > < br > class MyComponent() {}< / code > < / td >
< td > < p > Declares that a class is a component and provides metadata about the component.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > @Directive({...})< / b > < br > class MyDirective() {}< / code > < / td >
< td > < p > Declares that a class is a directive and provides metadata about the directive.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > @Pipe({...})< / b > < br > class MyPipe() {}< / code > < / td >
< td > < p > Declares that a class is a pipe and provides metadata about the pipe.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > @Injectable()< / b > < br > class MyService() {}< / code > < / td >
< td > < p > Declares that a class has dependencies that should be injected into the constructor when the dependency injector is creating an instance of this class.
< / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > Directive configuration< / th >
< th > < p > < code > @Directive({ property1: value1, ... })< / code >
< / p >
< / th >
< / tr >
< tr >
< td > < code > < b > selector:< / b > '.cool-button:not(a)'< / code > < / td >
< td > < p > Specifies a CSS selector that identifies this directive within a template. Supported selectors include < code > element< / code > ,
< code > [attribute]< / code > , < code > .class< / code > , and < code > :not()< / code > .< / p >
< p > Does not support parent-child relationship selectors.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > providers:< / b > [MyService, { provide: ... }]< / code > < / td >
< td > < p > List of dependency injection providers for this directive and its children.< / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > Component configuration< / th >
< th > < p >
< code > @Component< / code > extends < code > @Directive< / code > ,
so the < code > @Directive< / code > configuration applies to components as well< / p >
< / th >
< / tr >
< tr >
< td > < code > < b > moduleId:< / b > module.id< / code > < / td >
< td > < p > If set, the < code > templateUrl< / code > and < code > styleUrl< / code > are resolved relative to the component.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > viewProviders:< / b > [MyService, { provide: ... }]< / code > < / td >
< td > < p > List of dependency injection providers scoped to this component's view.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > template:< / b > 'Hello {{name}}'< br > < b > templateUrl:< / b > 'my-component.html'< / code > < / td >
< td > < p > Inline template or external template URL of the component's view.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > styles:< / b > ['.primary {color: red}']< br > < b > styleUrls:< / b > ['my-component.css']< / code > < / td >
< td > < p > List of inline CSS styles or external stylesheet URLs for styling the component’ < / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > Class field decorators for directives and components< / th >
< th > < p > < code > import { Input, ... } from '@angular/core';< / code >
< / p >
< / th >
< / tr >
< tr >
< td > < code > < b > @Input()< / b > myProperty;< / code > < / td >
< td > < p > Declares an input property that you can update via property binding (example:
< code > < my-cmp [myProperty]="someExpression"> < / code > ).< / p >
< / td >
< / tr > < tr >
< td > < code > < b > @Output()< / b > myEvent = new EventEmitter();< / code > < / td >
< td > < p > Declares an output property that fires events that you can subscribe to with an event binding (example: < code > < my-cmp (myEvent)="doSomething()"> < / code > ).< / p >
< / td >
< / tr > < tr >
< td > < code > < b > @HostBinding('class.valid')< / b > isValid;< / code > < / td >
< td > < p > Binds a host element property (here, the CSS class < code > valid< / code > ) to a directive/component property (< code > isValid< / code > ).< / p >
< / td >
< / tr > < tr >
< td > < code > < b > @HostListener('click', ['$event'])< / b > onClick(e) {...}< / code > < / td >
< td > < p > Subscribes to a host element event (< code > click< / code > ) with a directive/component method (< code > onClick< / code > ), optionally passing an argument (< code > $event< / code > ).< / p >
< / td >
< / tr > < tr >
< td > < code > < b > @ContentChild(myPredicate)< / b > myChildComponent;< / code > < / td >
< td > < p > Binds the first result of the component content query (< code > myPredicate< / code > ) to a property (< code > myChildComponent< / code > ) of the class.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > @ContentChildren(myPredicate)< / b > myChildComponents;< / code > < / td >
< td > < p > Binds the results of the component content query (< code > myPredicate< / code > ) to a property (< code > myChildComponents< / code > ) of the class.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > @ViewChild(myPredicate)< / b > myChildComponent;< / code > < / td >
< td > < p > Binds the first result of the component view query (< code > myPredicate< / code > ) to a property (< code > myChildComponent< / code > ) of the class. Not available for directives.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > @ViewChildren(myPredicate)< / b > myChildComponents;< / code > < / td >
< td > < p > Binds the results of the component view query (< code > myPredicate< / code > ) to a property (< code > myChildComponents< / code > ) of the class. Not available for directives.< / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > Directive and component change detection and lifecycle hooks< / th >
< th > < p > (implemented as class methods)
< / p >
< / th >
< / tr >
< tr >
< td > < code > < b > constructor(myService: MyService, ...)< / b > { ... }< / code > < / td >
< td > < p > Called before any other lifecycle hook. Use it to inject dependencies, but avoid any serious work here.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > ngOnChanges(changeRecord)< / b > { ... }< / code > < / td >
< td > < p > Called after every change to input properties and before processing content or child views.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > ngOnInit()< / b > { ... }< / code > < / td >
< td > < p > Called after the constructor, initializing input properties, and the first call to < code > ngOnChanges< / code > .< / p >
< / td >
< / tr > < tr >
< td > < code > < b > ngDoCheck()< / b > { ... }< / code > < / td >
< td > < p > 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.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > ngAfterContentInit()< / b > { ... }< / code > < / td >
< td > < p > Called after < code > ngOnInit< / code > when the component's or directive's content has been initialized.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > ngAfterContentChecked()< / b > { ... }< / code > < / td >
< td > < p > Called after every check of the component's or directive's content.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > ngAfterViewInit()< / b > { ... }< / code > < / td >
< td > < p > Called after < code > ngAfterContentInit< / code > when the component's view has been initialized. Applies to components only.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > ngAfterViewChecked()< / b > { ... }< / code > < / td >
< td > < p > Called after every check of the component's view. Applies to components only.< / p >
< / td >
< / tr > < tr >
< td > < code > < b > ngOnDestroy()< / b > { ... }< / code > < / td >
< td > < p > Called once, before the instance is destroyed.< / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > Dependency injection configuration< / th >
< th > < / th >
< / tr >
< tr >
< td > < code > { < b > provide< / b > : MyService, < b > useClass< / b > : MyMockService }< / code > < / td >
< td > < p > Sets or overrides the provider for < code > MyService< / code > to the < code > MyMockService< / code > class.< / p >
< / td >
< / tr > < tr >
< td > < code > { < b > provide< / b > : MyService, < b > useFactory< / b > : myFactory }< / code > < / td >
< td > < p > Sets or overrides the provider for < code > MyService< / code > to the < code > myFactory< / code > factory function.< / p >
< / td >
< / tr > < tr >
< td > < code > { < b > provide< / b > : MyValue, < b > useValue< / b > : 41 }< / code > < / td >
< td > < p > Sets or overrides the provider for < code > MyValue< / code > to the value < code > 41< / code > .< / p >
< / td >
< / tr >
< / tbody > < / table >
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< th > Routing and navigation< / th >
< th > < p > < code > import { Routes, RouterModule, ... } from '@angular/router';< / code >
< / p >
< / th >
< / tr >
< tr >
< td > < code > const routes: < b > Routes< / b > = [< br > { path: '', component: HomeComponent },< br > { path: 'path/:routeParam', component: MyComponent },< br > { path: 'staticPath', component: ... },< br > { path: '**', component: ... },< br > { path: 'oldPath', redirectTo: '/staticPath' },< br > { path: ..., component: ..., data: { message: 'Custom' } }< br > ]);< br > < br > const routing = RouterModule.forRoot(routes);< / code > < / td >
< td > < p > Configures routes for the application. Supports static, parameterized, redirect, and wildcard routes. Also supports custom route data and resolve.< / p >
< / td >
< / tr > < tr >
< td > < code > < br > < < b > router-outlet< / b > > < /< b > router-outlet< / b > > < br > < < b > router-outlet< / b > name="aux"> < /< b > router-outlet< / b > > < br > < / code > < / td >
< td > < p > Marks the location to load the component of the active route.< / p >
< / td >
< / tr > < tr >
< td > < code > < br > < a routerLink="/path"> < br > < a < b > [routerLink]< / b > ="[ '/path', routeParam ]"> < br > < a < b > [routerLink]< / b > ="[ '/path', { matrixParam: 'value' } ]"> < br > < a < b > [routerLink]< / b > ="[ '/path' ]" [queryParams]="{ page: 1 }"> < br > < a < b > [routerLink]< / b > ="[ '/path' ]" fragment="anchor"> < br > < / code > < / td >
< td > < p > Creates a link to a different view based on a route instruction consisting of a route path, required and optional parameters, query parameters, and a fragment. To navigate to a root route, use the < code > /< / code > prefix; for a child route, use the < code > ./< / code > prefix; for a sibling or parent, use the < code > ../< / code > prefix.< / p >
< / td >
< / tr > < tr >
< td > < code > < a [routerLink]="[ '/path' ]" routerLinkActive="active"> < / code > < / td >
< td > < p > The provided classes are added to the element when the < code > routerLink< / code > becomes the current active route.< / p >
< / td >
< / tr > < tr >
< td > < code > class < b > CanActivate< / b > Guard implements < b > CanActivate< / b > {< br > canActivate(< br > route: ActivatedRouteSnapshot,< br > state: RouterStateSnapshot< br > ): Observable< boolean> |Promise< boolean> |boolean { ... }< br > }< br > < br > { path: ..., canActivate: [< b > CanActivate< / b > Guard] }< / code > < / td >
< td > < p > An interface for defining a class that the router should call first to determine if it should activate this component. Should return a boolean or an Observable/Promise that resolves to a boolean.< / p >
< / td >
< / tr > < tr >
< td > < code > class < b > CanDeactivate< / b > Guard implements < b > CanDeactivate< / b > < T> {< br > canDeactivate(< br > component: T,< br > route: ActivatedRouteSnapshot,< br > state: RouterStateSnapshot< br > ): Observable< boolean> |Promise< boolean> |boolean { ... }< br > }< br > < br > { path: ..., canDeactivate: [< b > CanDeactivate< / b > Guard] }< / code > < / td >
< td > < p > An interface for defining a class that the router should call first to determine if it should deactivate this component after a navigation. Should return a boolean or an Observable/Promise that resolves to a boolean.< / p >
< / td >
< / tr > < tr >
< td > < code > class < b > CanActivateChild< / b > Guard implements < b > CanActivateChild< / b > {< br > canActivateChild(< br > route: ActivatedRouteSnapshot,< br > state: RouterStateSnapshot< br > ): Observable< boolean> |Promise< boolean> |boolean { ... }< br > }< br > < br > { path: ..., canActivateChild: [CanActivateGuard],< br > children: ... }< / code > < / td >
< td > < p > An interface for defining a class that the router should call first to determine if it should activate the child route. Should return a boolean or an Observable/Promise that resolves to a boolean.< / p >
< / td >
< / tr > < tr >
< td > < code > class < b > Resolve< / b > Guard implements < b > Resolve< / b > < T> {< br > resolve(< br > route: ActivatedRouteSnapshot,< br > state: RouterStateSnapshot< br > ): Observable< any> |Promise< any> |any { ... }< br > }< br > < br > { path: ..., resolve: [< b > Resolve< / b > Guard] }< / code > < / td >
< td > < p > An interface for defining a class that the router should call first to resolve route data before rendering the route. Should return a value or an Observable/Promise that resolves to a value.< / p >
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< / tr > < tr >
< td > < code > class < b > CanLoad< / b > Guard implements < b > CanLoad< / b > {< br > canLoad(< br > route: Route< br > ): Observable< boolean> |Promise< boolean> |boolean { ... }< br > }< br > < br > { path: ..., canLoad: [< b > CanLoad< / b > Guard], loadChildren: ... }< / code > < / td >
< td > < p > An interface for defining a class that the router should call first to check if the lazy loaded module should be loaded. Should return a boolean or an Observable/Promise that resolves to a boolean.< / p >
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< / tr >
< / tbody > < / table >
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