ngIf and CSS transitions/animations in Angular 2

How to slide a div in from the right using CSS in Angular 2?

  
 Notes

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.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;
}

This code works fine if you just use [ngClass] to switch classes, and take advantage of opacity. But don't want that element to be rendered from the beginning, so I "hide" it with ngIf first, but then the transition won't work.

Update 4.1.0

uses the transition animation API, no longer need to use [hidden] or [*ngIf hidden].

Update 2.1.0

View animation on angular.io

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: `
    toggle show ({{show}})

    
xxx
  `
})
export class App {
  show:boolean = false;
}

Original answer

When the expression becomes false, *ngIf will remove the element from the DOM. An element that does not exist cannot be transitioned.

can be replaced by the hidden attribute: