向宿主元素添加角度动画

Question

我通过

为主机添加了一个动画

@Component({
   ....,
   animations: [
      trigger('slideIn', [
          ...
      ])
   ],
   host: {
      '[@animation]': 'condition'
   }
}

工作得很好，在编译时我被告知这是不赞成的，我应该使用@HostBinding…

@HostBinding('[@animation]') get slideIn() {
   return condition;
}

抛出错误

Can't bind to '[@animation' since it isn't a known property of 'my-component-selector'.

，但我不能添加动画到我的模块..我该怎么办?

Answer 1

@HostBinding()

不需要方括号

@HostBinding('@slideIn') get slideIn() {

有两个装饰器@HostBinding()和@HostListener()，因此()和[]之间的区别是不必要的，而当使用host: [...]时，它是。

Answer 2

我写这个答案是因为我在语法上有点挣扎，我喜欢傻瓜的例子，但是g nter的答案是正确的。

我不得不做的:

    @Component({
        selector: 'app-sidenav',
        templateUrl: './sidenav.component.html',
        styleUrls: ['./sidenav.component.scss'],
        animations: [
            trigger('toggleDrawer', [
                state('closed', style({
                    transform: 'translateX(0)',
                    'box-shadow': '0px 3px 6px 1px rgba(0, 0, 0, 0.6)'
                })),
                state('opened', style({
                    transform: 'translateX(80vw)'
                })),
                transition('closed <=> opened', animate(300))
            ])
        ]
    })
    export class SidenavComponent implements OnInit {
        private state: 'opened' | 'closed' = 'closed';
        // binds the animation to the host component
        @HostBinding('@toggleDrawer') get getToggleDrawer(): string {
            return this.state === 'closed' ? 'opened' : 'closed';
        }
        constructor() { }
        ngOnInit(): void {
        }
        // toggle drawer
        toggle(): void {
            this.state = this.state === 'closed' ? 'opened' : 'closed';
        }
        // opens drawer
        open(): void {
            this.state = 'opened';
        }
        // closes drawer
        close(): void {
            this.state = 'closed';
        }
    }