html - Angular 6 - 如何根据条件禁用 div

Question

我有一个 div，它会在单击一个按钮时展开，当我再次单击该 div 时，它将是可单击的或会出现警报，但是当我单击展开(100%) View 时，它不应该是可单击的，它应该就像禁用一样。当我回到上一个(25％) View 时，div 应该是可点击的。任何人都可以帮助我。这是下面的代码

app.component.html

<button (click)="change()">change</button>
<div (click)="expand()" [ngClass]="{'old': toggle, 'new': !toggle}"class="old">
  Hello
</div>

应用程序组件.ts

declare var require: any;
import { Component,OnInit, Output, EventEmitter } from '@angular/core';
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit{
    toggle:boolean = true;
  ngOnInit(){

  }
change(){
    this.toggle = !this.toggle;
  }
expand(){
    alert('hi');
  }
}

样式.css

.old{
    width:25%;
    border:1px solid;
    height:200px;
    cursor:pointer;
    background:yellow;
}
.new{
    width:100%;
    border:1px solid;
    height:200px;
    cursor:pointer;
    background:green;
}

Answer 1

试试这个:

<button (click)="change()">change</button>
<div  [class.disabled]="!toggle"  (click)="toggle && expand()" [ngClass]="{'old': toggle, 'new': !toggle}"class="old">
  Hello
</div>

在 CSS 中:

.disabled {
  cursor: not-allowed;
}

Working Demo