angular 2 ngIf和CSS过渡/动画

Question

我想要一个div从右边滑入角2使用CSS。

  <div class="note" [ngClass]="{'transition':show}" *ngIf="show">
    <p> Notes</p>
  </div>
  <button class="btn btn-default" (click)="toggle(show)">Toggle</button>

如果我只使用[ngClass]来切换类和使用不透明度，我就能正常工作。但是li不想从一开始就呈现该元素，所以我首先用ngIf“隐藏”它，但是之后的过渡就不起作用了。

.transition{
  -webkit-transition: opacity 1000ms ease-in-out,margin-left 500ms ease-in-out;
  -moz-transition: opacity 1000ms ease-in-out,margin-left 500ms ease-in-out;
  -ms-transition: opacity 1000ms ease-in-out,margin-left 500ms ease-in-out ;
  -o-transition: opacity 1000ms ease-in-out,margin-left 500ms ease-in-out;
  transition: opacity 1000ms ease-in-out,margin-left 500ms ease-in-out;
  margin-left: 1500px;
  width: 200px;
  opacity: 0;
}

.transition{
  opacity: 100;
  margin-left: 0;
}

Answer 1

更新4.1.0

柱塞

另请参见https://github.com/angular/angular/blob/master/changelog.md#400-rc1-2017-02-24

更新2.1.0

柱塞

有关更多详细信息，请参阅Angular.io处的动画

import { trigger, style, animate, transition } from '@angular/animations';

@Component({
  selector: 'my-app',
  animations: [
    trigger(
      'enterAnimation', [
        transition(':enter', [
          style({transform: 'translateX(100%)', opacity: 0}),
          animate('500ms', style({transform: 'translateX(0)', opacity: 1}))
        ]),
        transition(':leave', [
          style({transform: 'translateX(0)', opacity: 1}),
          animate('500ms', style({transform: 'translateX(100%)', opacity: 0}))
        ])
      ]
    )
  ],
  template: `
    <button (click)="show = !show">toggle show ({{show}})</button>

    <div *ngIf="show" [@enterAnimation]>xxx</div>
  `
})
export class App {
  show:boolean = false;
}

原件

*ngif在表达式变为false时从DOM中删除元素。不能对不存在的元素进行转换。

改用hidden:

<div class="note" [ngClass]="{'transition':show}" [hidden]="!show">