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Angular 2/4/5/6 cheatsheet
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Alik Chebotar
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frontend/angular.js
vendored
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346
frontend/angular.js
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/* *******************************************************************************************
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* ANGULAR CHEATSHEET
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* DOCUMENTATION: https://angular.io/docs
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* STYLE GUIDE: https://angular.io/guide/styleguide
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* ******************************************************************************************* */
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```
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npm install --save @angular/cli // declarative and flexible JavaScript framework for building UI
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ng serve // serve the app
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ng build // build the release
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```
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/* *******************************************************************************************
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* Bootstrapping
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* ******************************************************************************************* */
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import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
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platformBrowserDynamic().bootstrapModule(AppModule);
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// Bootstraps the app, using the root component from the specified NgModule.
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/* *******************************************************************************************
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* NgModules
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* ******************************************************************************************* */
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import { NgModule } from '@angular/core';
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@NgModule({ declarations: ..., imports: ...,
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exports: ..., providers: ..., bootstrap: ...})
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class MyModule {}
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// Defines a module that contains components, directives, pipes, and providers.
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declarations: [MyRedComponent, MyBlueComponent, MyDatePipe]
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// List of components, directives, and pipes that belong to this module.
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imports: [BrowserModule, SomeOtherModule]
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// List of modules to import into this module. Everything from the imported modules is available to declarations of this module.
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exports: [MyRedComponent, MyDatePipe]
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// List of components, directives, and pipes visible to modules that import this module.
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providers: [MyService, { provide: ... }]
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// List of dependency injection providers visible both to the contents of this module and to importers of this module.
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bootstrap: [MyAppComponent]
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// List of components to bootstrap when this module is bootstrapped.
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/* *******************************************************************************************
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* Template syntax
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* ******************************************************************************************* */
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// <input [value]="firstName">
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// Binds property value to the result of expression firstName.
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// <div [attr.role]="myAriaRole">
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// Binds attribute role to the result of expression myAriaRole.
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// <div [class.extra-sparkle]="isDelightful">
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// Binds the presence of the CSS class extra-sparkle on the element to the truthiness of the expression isDelightful.
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// <div [style.width.px]="mySize">
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// Binds style property width to the result of expression mySize in pixels. Units are optional.
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// <button (click)="readRainbow($event)">
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// Calls method readRainbow when a click event is triggered on this button element (or its children) and passes in the event object.
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// <div title="Hello {{ponyName}}">
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// Binds a property to an interpolated string, for example, "Hello Seabiscuit". Equivalent to: <div [title]="'Hello ' + ponyName">
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// <p>Hello {{ponyName}}</p>
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// Binds text content to an interpolated string, for example, "Hello Seabiscuit".
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// <my-cmp [(title)]="name">
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// Sets up two-way data binding. Equivalent to: <my-cmp [title]="name" (titleChange)="name=$event">
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// <video #movieplayer ...>
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// <button (click)="movieplayer.play()">
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// </video>
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// Creates a local variable movieplayer that provides access to the video element instance in data-binding and event-binding expressions in the current template.
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// <p *myUnless="myExpression">...</p>
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// The * symbol turns the current element into an embedded template. Equivalent to: <ng-template [myUnless]="myExpression"><p>...</p></ng-template>
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// <p>Card No.: {{cardNumber | myCardNumberFormatter}}</p>
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// Transforms the current value of expression cardNumber via the pipe called myCardNumberFormatter.
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// <p>Employer: {{employer?.companyName}}</p>
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// The safe navigation operator (?) means that the employer field is optional and if undefined, the rest of the expression should be ignored.
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// <svg:rect x="0" y="0" width="100" height="100"/>
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// An SVG snippet template needs an svg: prefix on its root element to disambiguate the SVG element from an HTML component.
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// <svg>
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// <rect x="0" y="0" width="100" height="100"/>
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// </svg>
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// An <svg> root element is detected as an SVG element automatically, without the prefix.
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/* *******************************************************************************************
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* Built-in directives
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* ******************************************************************************************* */
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import { CommonModule } from '@angular/common';
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// // <section *ngIf="showSection">
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// // Removes or recreates a portion of the DOM tree based on the showSection expression.
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// <li *ngFor="let item of list">
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// Turns the li element and its contents into a template, and uses that to instantiate a view for each item in list.
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// <div [ngSwitch]="conditionExpression">
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// <ng-template [ngSwitchCase]="case1Exp">...</ng-template>
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// <ng-template ngSwitchCase="case2LiteralString">...</ng-template>
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// <ng-template ngSwitchDefault>...</ng-template>
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// </div>
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// Conditionally swaps the contents of the div by selecting one of the embedded templates based on the current value of conditionExpression.
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// <div [ngClass]="{'active': isActive, 'disabled': isDisabled}">
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// 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.
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// <div [ngStyle]="{'property': 'value'}">
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// <div [ngStyle]="dynamicStyles()">
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// Allows you to assign styles to an HTML element using CSS. You can use CSS directly, as in the first example, or you can call a method from the component.
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/* *******************************************************************************************
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* Forms
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* ******************************************************************************************* */
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import { FormsModule } from '@angular/forms';
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// <input [(ngModel)]="userName">
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// Provides two-way data-binding, parsing, and validation for form controls.
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/* *******************************************************************************************
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* Class decorators
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* ******************************************************************************************* */
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import { Directive, ... } from '@angular/core';
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@Component({...})
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class MyComponent() {}
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// Declares that a class is a component and provides metadata about the component.
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@Directive({...})
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class MyDirective() {}
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// Declares that a class is a directive and provides metadata about the directive.
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@Pipe({...})
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class MyPipe() {}
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// Declares that a class is a pipe and provides metadata about the pipe.
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@Injectable()
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class MyService() {}
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// Declares that a class has dependencies that should be injected into the constructor when the dependency injector is creating an instance of this class.
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/* *******************************************************************************************
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* Directive configuration
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* ******************************************************************************************* */
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@Directive({ property1: value1, ... })
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selector: '.cool-button:not(a)'
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// Specifies a CSS selector that identifies this directive within a template. Supported selectors include element, [attribute], .class, and :not().
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// Does not support parent-child relationship selectors.
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providers: [MyService, { provide: ... }]
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// List of dependency injection providers for this directive and its children.
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/* *******************************************************************************************
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* Component configuration
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* ******************************************************************************************* */
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@Component extends @Directive, so the @Directive configuration applies to components as well
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moduleId: module.id
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// If set, the templateUrl and styleUrl are resolved relative to the component.
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viewProviders: [MyService, { provide: ... }]
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// List of dependency injection providers scoped to this component's view.
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template: 'Hello {{name}}'
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templateUrl: 'my-component.html'
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// Inline template or external template URL of the component's view.
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styles: ['.primary {color: red}']
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styleUrls: ['my-component.css']
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// List of inline CSS styles or external stylesheet URLs for styling the component’s view.
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/* *******************************************************************************************
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* Class field decorators for directives and components
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* ******************************************************************************************* */
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import { Input, ... } from '@angular/core';
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@Input() myProperty;
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// Declares an input property that you can update via property binding (example: <my-cmp [myProperty]="someExpression">).
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@Output() myEvent = new EventEmitter();
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// Declares an output property that fires events that you can subscribe to with an event binding (example: <my-cmp (myEvent)="doSomething()">).
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@HostBinding('class.valid') isValid;
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// Binds a host element property (here, the CSS class valid) to a directive/component property (isValid).
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@HostListener('click', ['$event']) onClick(e) {...}
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// Subscribes to a host element event (click) with a directive/component method (onClick), optionally passing an argument ($event).
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@ContentChild(myPredicate) myChildComponent;
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// Binds the first result of the component content query (myPredicate) to a property (myChildComponent) of the class.
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@ContentChildren(myPredicate) myChildComponents;
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// Binds the results of the component content query (myPredicate) to a property (myChildComponents) of the class.
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@ViewChild(myPredicate) myChildComponent;
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// Binds the first result of the component view query (myPredicate) to a property (myChildComponent) of the class. Not available for directives.
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@ViewChildren(myPredicate) myChildComponents;
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// Binds the results of the component view query (myPredicate) to a property (myChildComponents) of the class. Not available for directives.
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/* *******************************************************************************************
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* Directive and component change detection and lifecycle hooks
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* ******************************************************************************************* */
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// (implemented as class methods)
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constructor(myService: MyService, ...) { ... }
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// Called before any other lifecycle hook. Use it to inject dependencies, but avoid any serious work here.
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ngOnChanges(changeRecord) { ... }
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// Called after every change to input properties and before processing content or child views.
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ngOnInit() { ... }
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// Called after the constructor, initializing input properties, and the first call to ngOnChanges.
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ngDoCheck() { ... }
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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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ngAfterContentInit() { ... }
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// Called after ngOnInit when the component's or directive's content has been initialized.
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ngAfterContentChecked() { ... }
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// Called after every check of the component's or directive's content.
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ngAfterViewInit() { ... }
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// Called after ngAfterContentInit when the component's views and child views / the view that a directive is in has been initialized.
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ngAfterViewChecked() { ... }
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// Called after every check of the component's views and child views / the view that a directive is in.
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ngOnDestroy() { ... }
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// Called once, before the instance is destroyed.
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/* *******************************************************************************************
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* Dependency injection configuration
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* ******************************************************************************************* */
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{ provide: MyService, useClass: MyMockService }
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// Sets or overrides the provider for MyService to the MyMockService class.
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{ provide: MyService, useFactory: myFactory }
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// Sets or overrides the provider for MyService to the myFactory factory function.
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{ provide: MyValue, useValue: 41 }
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// Sets or overrides the provider for MyValue to the value 41.
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/* *******************************************************************************************
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* Routing and navigation
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* ******************************************************************************************* */
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import { Routes, RouterModule, ... } from '@angular/router';
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const routes: Routes = [
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{ path: '', component: HomeComponent },
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{ path: 'path/:routeParam', component: MyComponent },
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{ path: 'staticPath', component: ... },
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{ path: '**', component: ... },
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{ path: 'oldPath', redirectTo: '/staticPath' },
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{ path: ..., component: ..., data: { message: 'Custom' } }
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]);
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const routing = RouterModule.forRoot(routes);
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// Configures routes for the application. Supports static, parameterized, redirect, and wildcard routes. Also supports custom route data and resolve.
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// <router-outlet></router-outlet>
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// <router-outlet name="aux"></router-outlet>
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// Marks the location to load the component of the active route.
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// <a routerLink="/path">
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// <a [routerLink]="[ '/path', routeParam ]">
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// <a [routerLink]="[ '/path', { matrixParam: 'value' } ]">
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// <a [routerLink]="[ '/path' ]" [queryParams]="{ page: 1 }">
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// <a [routerLink]="[ '/path' ]" fragment="anchor">
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// 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 / prefix; for a child route, use the ./prefix; for a sibling or parent, use the ../ prefix.
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// <a [routerLink]="[ '/path' ]" routerLinkActive="active">
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// The provided classes are added to the element when the routerLink becomes the current active route.
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class CanActivateGuard implements CanActivate {
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canActivate(
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route: ActivatedRouteSnapshot,
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state: RouterStateSnapshot
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): Observable<boolean>|Promise<boolean>|boolean { ... }
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}
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{ path: ..., canActivate: [CanActivateGuard] }
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// 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.
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class CanDeactivateGuard implements CanDeactivate<T> {
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canDeactivate(
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component: T,
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route: ActivatedRouteSnapshot,
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state: RouterStateSnapshot
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): Observable<boolean>|Promise<boolean>|boolean { ... }
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}
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{ path: ..., canDeactivate: [CanDeactivateGuard] }
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// 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.
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class CanActivateChildGuard implements CanActivateChild {
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canActivateChild(
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route: ActivatedRouteSnapshot,
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state: RouterStateSnapshot
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): Observable<boolean>|Promise<boolean>|boolean { ... }
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}
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{ path: ..., canActivateChild: [CanActivateGuard],
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children: ... }
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// 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.
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class ResolveGuard implements Resolve<T> {
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resolve(
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route: ActivatedRouteSnapshot,
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state: RouterStateSnapshot
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): Observable<any>|Promise<any>|any { ... }
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}
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{ path: ..., resolve: [ResolveGuard] }
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// 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.
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class CanLoadGuard implements CanLoad {
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canLoad(
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route: Route
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): Observable<boolean>|Promise<boolean>|boolean { ... }
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}
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{ path: ..., canLoad: [CanLoadGuard], loadChildren: ... }
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// 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.
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