Angular 2+和debounce

在AngularJS中，我可以使用ng-model选项来撤销一个模型。

ng-model-options="{ debounce: 1000 }"

如何在Angular中释放一个模型? 我试着在文档里搜索debounce，但什么都没找到。

https://angular.io/search/#stq=debounce&stp=1

一个解决方案是编写我自己的debounce函数，例如:

import {Component, Template, bootstrap} from 'angular2/angular2';

// Annotation section
@Component({
  selector: 'my-app'
})
@Template({
  url: 'app.html'
})
// Component controller
class MyAppComponent {
  constructor() {
    this.firstName = 'Name';
  }
    
  changed($event, el){
    console.log("changes", this.name, el.value);
    this.name = el.value;
  }

  firstNameChanged($event, first){
    if (this.timeoutId) window.clearTimeout(this.timeoutID);
    this.timeoutID = window.setTimeout(() => {
        this.firstName = first.value;
    }, 250)
  }
    
}
bootstrap(MyAppComponent);

我的html

<input type=text [value]="firstName" #first (keyup)="firstNameChanged($event, first)">

但我正在寻找一个内置函数，Angular中有吗?

当前回答

在事件函数中直接初始化订阅者的解决方案:

import {Subject} from 'rxjs';
import {debounceTime, distinctUntilChanged} from 'rxjs/operators';

class MyAppComponent {
    searchTermChanged: Subject<string> = new Subject<string>();

    constructor() {
    }

    onFind(event: any) {
        if (this.searchTermChanged.observers.length === 0) {
            this.searchTermChanged.pipe(debounceTime(1000), distinctUntilChanged())
                .subscribe(term => {
                    // your code here
                    console.log(term);
                });
        }
        this.searchTermChanged.next(event);
    }
}

和html:

<input type="text" (input)="onFind($event.target.value)">

2018-11-21 09:56:07

其他回答

它可以作为指令来执行

import { Directive, Input, Output, EventEmitter, OnInit, OnDestroy } from '@angular/core';
import { NgControl } from '@angular/forms';
import 'rxjs/add/operator/debounceTime';
import 'rxjs/add/operator/distinctUntilChanged';
import { Subscription } from 'rxjs';

@Directive({
  selector: '[ngModel][onDebounce]',
})
export class DebounceDirective implements OnInit, OnDestroy {
  @Output()
  public onDebounce = new EventEmitter<any>();

  @Input('debounce')
  public debounceTime: number = 300;

  private isFirstChange: boolean = true;
  private subscription: Subscription;

  constructor(public model: NgControl) {
  }

  ngOnInit() {
    this.subscription =
      this.model.valueChanges
        .debounceTime(this.debounceTime)
        .distinctUntilChanged()
        .subscribe(modelValue => {
          if (this.isFirstChange) {
            this.isFirstChange = false;
          } else {
            this.onDebounce.emit(modelValue);
          }
        });
  }

  ngOnDestroy() {
    this.subscription.unsubscribe();
  }

}

像这样使用它

<input [(ngModel)]="value" (onDebounce)="doSomethingWhenModelIsChanged($event)">

组件示例

import { Component } from "@angular/core";

@Component({
  selector: 'app-sample',
  template: `
<input[(ngModel)]="value" (onDebounce)="doSomethingWhenModelIsChanged($event)">
<input[(ngModel)]="value" (onDebounce)="asyncDoSomethingWhenModelIsChanged($event)">
`
})
export class SampleComponent {
  value: string;

  doSomethingWhenModelIsChanged(value: string): void {
    console.log({ value });
  }

  async asyncDoSomethingWhenModelIsChanged(value: string): Promise<void> {
    return new Promise<void>(resolve => {
      setTimeout(() => {
        console.log('async', { value });
        resolve();
      }, 1000);
    });
  }
}

2017-02-10 12:37:39

这是我迄今为止找到的最好的解决办法。更新ngModelon的模糊和反弹

import { Directive, Input, Output, EventEmitter,ElementRef } from '@angular/core';
import { NgControl, NgModel } from '@angular/forms';
import 'rxjs/add/operator/debounceTime'; 
import 'rxjs/add/operator/distinctUntilChanged';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/fromEvent';
import 'rxjs/add/operator/map';

@Directive({
    selector: '[ngModel][debounce]',
})
export class DebounceDirective {
    @Output()
    public onDebounce = new EventEmitter<any>();

    @Input('debounce')
    public debounceTime: number = 500;

    private isFirstChange: boolean = true;

    constructor(private elementRef: ElementRef, private model: NgModel) {
    }

    ngOnInit() {
        const eventStream = Observable.fromEvent(this.elementRef.nativeElement, 'keyup')
            .map(() => {
                return this.model.value;
            })
            .debounceTime(this.debounceTime);

        this.model.viewToModelUpdate = () => {};

        eventStream.subscribe(input => {
            this.model.viewModel = input;
            this.model.update.emit(input);
        });
    }
}

引自https://stackoverflow.com/a/47823960/3955513

然后在HTML中:

<input [(ngModel)]="hero.name" 
        [debounce]="3000" 
        (blur)="hero.name = $event.target.value"
        (ngModelChange)="onChange()"
        placeholder="name">

在模糊模型是显式更新使用纯javascript。

例如:https://stackblitz.com/edit/ng2-debounce-working

2018-02-21 10:59:57

在事件函数中直接初始化订阅者的解决方案:

import {Subject} from 'rxjs';
import {debounceTime, distinctUntilChanged} from 'rxjs/operators';

class MyAppComponent {
    searchTermChanged: Subject<string> = new Subject<string>();

    constructor() {
    }

    onFind(event: any) {
        if (this.searchTermChanged.observers.length === 0) {
            this.searchTermChanged.pipe(debounceTime(1000), distinctUntilChanged())
                .subscribe(term => {
                    // your code here
                    console.log(term);
                });
        }
        this.searchTermChanged.next(event);
    }
}

和html:

<input type="text" (input)="onFind($event.target.value)">

2018-11-21 09:56:07

不像在angar1中那样直接访问，但你可以轻松地使用NgFormControl和RxJS的观察对象:

<input type="text" [ngFormControl]="term"/>

this.items = this.term.valueChanges
  .debounceTime(400)
  .distinctUntilChanged()
  .switchMap(term => this.wikipediaService.search(term));

这篇博文解释得很清楚: http://blog.thoughtram.io/angular/2016/01/06/taking-advantage-of-observables-in-angular2.html

这里是自动补全，但它适用于所有场景。

2016-01-07 13:40:21

HTML文件:

<input [ngModel]="filterValue"
       (ngModelChange)="filterValue = $event ; search($event)"
        placeholder="Search..."/>

TS文件:

timer = null;
time = 250;
  search(searchStr : string) : void {
    clearTimeout(this.timer);
    this.timer = setTimeout(()=>{
      console.log(searchStr);
    }, time)
  }

2018-12-11 14:29:44

Angular 2+和debounce

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