如何在删除 Angular2 中的 dom 元素时触发动画?
import { Component, Input, Output, EventEmitter } from '@angular/core';
import { FormGroup, FormControl, Validators } from "@angular/forms";
import {
trigger,
state,
style,
animate,
transition
} from '@angular/animations';
import { ServerService } from './server.service';
@Component({
selector: 'fc-server',
templateUrl: './server.component.html',
animations: [
trigger('flyInFlyOut', [
state('*', style({transform: 'translateX(0)', opacity: 1})),
transition('void => *', [
style({transform: 'translateX(-100%)', opacity: 0}),
animate('400ms ease')
]),
transition('* => void', [
style({transform: 'translateX(-100%)'}),
animate('400ms ease')
])
])
]
})
export class Server {
@Input() serverInstance;
serverForm;
constructor(
private serverService: ServerService) {}
ngOnInit() {
this.serverForm = new FormGroup({
serverName: new FormControl('', Validators.required),
serverPort: new FormControl('', Validators.required),
serverIp: new FormControl('', Validators.required),
});
}
@Output() remove = new EventEmitter();
onRemove() {
this.serverService.remove(this.serverInstance);
}
onSubmit(serverInstance) {
this.serverService.add(serverInstance);
}
}
一切正常,从列表中删除项目,将项目添加到列表中,动画...除非删除某个项,否则将删除该列表项,而不带动画。有什么见解吗?
这似乎是 Angular2 反复出现的问题,但据我所知,没有人真正有很好的解决方案。
例如,这篇文章: https://www.bennadel.com/blog/3140-using-changedetection-with-animation-to-setup-dynamic-void-transitions-in-angular-2-rc-6.htm
还需要定义void
的结束state
:
state('void', style({transform: 'translateX(100%)', opacity: 0}))
然后删除* => void
过渡中的style({transform: 'translateX(-100%)'}),
行。
或者我会把它写成一种在我看来更容易理解的形式:
trigger('flyInFlyOut', [
transition(':enter', [
// the element receives this style immediately and then animates to the
// next style which is the `style({ transform: 'translateX(0)', opacity: 1 })`
style({ transform: 'translateX(-100%)', opacity: 0 }),
animate('300ms', style({ transform: 'translateX(0)', opacity: 1 })),
]),
transition(':leave', [
style({ transform: 'translateX(0)', opacity: 1 }),
animate('200ms', style({ transform: 'translateX(100%)', opacity: 0 })),
]),
]);
:leave
和:enter
分别是* => void
和void => *
的简写。
您是否还需要解决方案,但是您可以将动画设置为true,对于更干净的代码,您可以定义void状态而不是*(默认(的样式,angular足够聪明,可以知道最终样式应该是什么样子,例如:
@Component({
selector: 'fc-server',
templateUrl: './server.component.html',
animations: [
trigger('flyInFlyOut', [
state('void', style({transform: 'translateX(-100%)', opacity: 0})),
transition('void => *', [
animate('400ms ease')
]),
transition('* => void', [
animate('400ms ease')
])
])
],
host: {
'[@flyInFlyOut]': 'true'
}
})
此外,如果要将别名用于 (void => ( 和 ( => void( 转换,它们分别是 (:enter( 和 (:leave(,如另一个答案中所述。
我遇到了完全相同的问题,并找到了这个解决方案。希望对您有所帮助。:)