Angular 4 复选框在模型更改时触发更改事件 [英] Angular 4 checkbox trigger change event on model change

问题描述

HTML

<input type="checkbox" id="1" [(ngModel)]="filter" (change)="onFilterChange($event)"> CheckBox

<button (click)="filter = !filter">Change Status</button>

TS

export class HelloWorld {

  filter : false;

  onFilterChange() {
    console.log('filter change called');
  }
}

当我直接点击复选框时会触发更改事件.但是，当我单击更改状态"按钮时，复选框状态正在更改但未触发更改事件.有人可以让我知道如何做到这一点吗?

When I directly click on the check box change event is triggered. But when I click on "Change Status" button checkbox status is changing but change event is not triggering. Can some one please let me know how to do this?

推荐答案

我们必须使用事件处理程序而不是 2 路绑定来实现此功能

We have to achieve this functionality with event handler and not with 2 way binding

<input type="checkbox" id="1"
       [ngModel]="filter" (ngModelChange)="onFilterChange($event)"> Checkbox

<button (click)="onFilterChange($event)">Change Status</button>  

在 TS 中，

export class HelloWorld {

  filter = false;

  onFilterChange(eve: any) {
    this.filter = !this.filter;
  }
}

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