Disabling a button by grabbing ElementRef: angular

问题:

I'm trying to disable a button when it is clicked. By clicking I'm calling a function and I want to disable the button using that function. How can I access button's property with ElementRef and disable it? I'm not very familiar with how to use ElementRef. Any help would be greatly appreciated!

回答1:

If you really wanted to disable the button via an ElementRef, you can use the ViewChild method to get a reference to your button and then set the button to disabled using its nativeElement property.

import { Component, ViewChild } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `<h1>My First Angular 2 App</h1>
             <button #myButton (click)="onClicked()">Click me!</button>`
})
export class AppComponent {
  @ViewChild('myButton') button;

  onClicked() {
    this.button.nativeElement.disabled = true;
  }
}

---

However, Angular2 recommends using ElementRef's as a last resort. The same functionality you desire can be achieved through property binding.

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

@Component({
  selector: 'my-app',
  template: `<h1>My First Angular 2 App</h1>
             <button [disabled]="isDisabled" (click)="onClicked()">Click me!</button>`
})
export class AppComponent {
  private isDisabled = false;

  onClicked() {
    this.isDisabled = true;
  }
}