EventEmitter} from '@angular/core';//子组件中实例化 EventEmitter//用 EventEmitter 和 @Output 装饰器配合使用 <string> 指定类型变量@Output() private outer=newEventEmitter<string>();//子组件通过 EventEmitter 对象 outer 实例广播数据sendParent(){this.outer.emit('msg from child')...
get('age'); return name && age && name.value === 'lala' && age.value === 12 ? { 'nameAgeInvalid': true } : null; }; @Component({ selector: 'app-reactive-forms', templateUrl: './reactive-forms.component.html', styleUrls: ['./reactive-forms.component.scss'] }) export class ...
import{Hero}from'../hero';import{HeroService}from'../hero.service';@Component({selector:'app-hero-list',template:'Heroes: {{heroes | json}}'})exportclassHeroListComponentimplementsOnInit{heroes!:Hero[];constructor(publicheroService:HeroService){}ngOnInit():void{this.heroes=this.heroService....
代码语言:typescript 复制 import { Component, OnInit } from '@angular/core'; import { Observable } from 'rxjs/Observable'; @Component({ selector: 'app-example', template: ` <div>{{ value }}</div> ` }) export class ExampleComponent implements OnInit { value:...
创建D组件d.component.ts获取localStorage中cValue的值。 import { Component } from '@angular/core'; @Component({ selector: 'app-d', templateUrl: './d.component.html', }) export class DComponent { data: any; constructor() {} getValue() { ...
{ Subject }from'rxjs';import{ filter, takeUntil }from'rxjs/operators';@Component({ selector:'app-root', templateUrl:'./app.component.html'})exportclassAppComponentimplementsOnInit, OnDestroy { title ='Angular - MSAL Example'; loginDisplay =false; tokenExpiration:string='';privatereadonly _...
图16 利用同个selector可以叠加重复指令,给组件库的Draggable指令和Droppable指令叠加一个额外的指令并把DragDropService的token替换成已经在root提供单例的DragDropGlobalService 如图15和16, 我们通过元素注入器,叠加了指令,把DragDropService这个令牌替换成我们自己的全局单例的实例。这时候需要使用这个全局单例的DragDrop...
component if it is different from the previous value (based on `Object.is` equality). If code relies on the input always being set, it should be updated to copy objects or wrap primitives in order to ensure the input value differs from the previous call to `setInput`. ...
import { Component } from '@angular/core'; import { Location, LocationStrategy, PathLocationStrategy, } from '@angular/common'; //引入获取、修改当前页面url相关参数的类 @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.scss'], providers:...
import { Component } from '@angular/core'; import { FormGroup, FormControl, Validators } from '@angular/forms'; @Component({ selector: 'app-reactive-form', templateUrl: './reactive-form.component.html', styleUrls: ['./reactive-form.component.css'] }) export class ReactiveFormComponent {...