通過輸入過濾掉表值

匯入 ReactiveFormsModule，然後

import { Component, OnInit, OnDestroy } from '@angular/core';
import { FormControl } from '@angular/forms';
import { Subscription } from 'rxjs';

@Component({
  selector: 'component',
  template: `
    <input [formControl]="control" />
    <div *ngFor="let item of content">
      {{item.id}} - {{item.name}}
    </div>
  `
})
export class MyComponent implements OnInit, OnDestroy {

  public control = new FormControl('');

  public content: { id: number; name: string; }[];
  
  private originalContent = [
    { id: 1, name: 'abc' },
    { id: 2, name: 'abce' },
    { id: 3, name: 'ced' }
  ];
  
  private subscription: Subscription;
  
  public ngOnInit() {
    this.subscription = this.control.valueChanges.subscribe(value => {
      this.content = this.originalContent.filter(item => item.name.startsWith(value));
    });
  }
  
  public ngOnDestroy() {
    this.subscription.unsubscribe();
  }
  
}