角度2 ngIf和CSS过渡/动画

问题描述 投票:98回答:6

我希望div使用css从角度2向右滑入。

  <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]切换类并使用不透明度,我工作正常。但是li不希望从头开始渲染该元素,所以我首先用ngIf“隐藏”它,但是过渡不会起作用。

.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;
}
css angular angular-animations
6个回答
175
投票

更新4.1.0

Plunker

另见https://github.com/angular/angular/blob/master/CHANGELOG.md#400-rc1-2017-02-24

更新2.1.0

Plunker

有关更多详细信息,请参阅Animations at 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: `
    <button (click)="show = !show">toggle show ({{show}})</button>

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

原版的

当表达式变为*ngIf时,false从DOM中删除元素。您不能在不存在的元素上进行转换。

请改用hidden

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

118
投票

根据最新的angular 2 documentation,您可以设置“进入和离开”元素的动画(如角度1)。

简单淡入淡出动画的示例:

在相关的@Component中添加:

animations: [
  trigger('fadeInOut', [
    transition(':enter', [   // :enter is alias to 'void => *'
      style({opacity:0}),
      animate(500, style({opacity:1})) 
    ]),
    transition(':leave', [   // :leave is alias to '* => void'
      animate(500, style({opacity:0})) 
    ])
  ])
]

不要忘记添加导入

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

相关组件的html元素应如下所示:

<div *ngIf="toggle" [@fadeInOut]>element</div>

我建立了幻灯片和淡入淡出动画here的例子。

关于'void'和'*'的说明:

  • voidngIf设置为false时的状态(当元素未附加到视图时适用)。
  • * - 可以有许多动画状态(在文档中阅读更多)。 *状态优先于所有这些状态作为“通配符”(在我的示例中,这是ngIf设置为true时的状态)。

注意(取自角度文档):

在app模块import { BrowserAnimationsModule } from '@angular/platform-browser/animations';中额外声明

角度动画构建于标准Web动画API之上,并在支持它的浏览器上本机运行。对于其他浏览器,需要填充。从GitHub获取web-animations.min.js并将其添加到您的页面。


14
投票
    trigger('slideIn', [
      state('*', style({ 'overflow-y': 'hidden' })),
      state('void', style({ 'overflow-y': 'hidden' })),
      transition('* => void', [
        style({ height: '*' }),
        animate(250, style({ height: 0 }))
      ]),
      transition('void => *', [
        style({ height: '0' }),
        animate(250, style({ height: '*' }))
      ])
    ])

9
投票

现代浏览器的CSS唯一解决方案

@keyframes slidein {
    0%   {margin-left:1500px;}
    100% {margin-left:0px;}
}
.note {
    animation-name: slidein;
    animation-duration: .9s;
    display: block;
}

3
投票

我使用角度5和ngif为我工作,我必须使用animateChild,在用户详细信息组件中我使用* ngIf =“user.expanded”来显示隐藏用户并且它可以用于输入离开

 <div *ngFor="let user of users" @flyInParent>
  <ly-user-detail [user]= "user" @flyIn></user-detail>
</div>

//the animation file


export const FLIP_TRANSITION = [ 
trigger('flyInParent', [
    transition(':enter, :leave', [
      query('@*', animateChild())
    ])
  ]),
  trigger('flyIn', [
    state('void', style({width: '100%', height: '100%'})),
    state('*', style({width: '100%', height: '100%'})),
    transition(':enter', [
      style({
        transform: 'translateY(100%)',
        position: 'fixed'
      }),
      animate('0.5s cubic-bezier(0.35, 0, 0.25, 1)', style({transform: 'translateY(0%)'}))
    ]),
    transition(':leave', [
      style({
        transform: 'translateY(0%)',
        position: 'fixed'
      }),
      animate('0.5s cubic-bezier(0.35, 0, 0.25, 1)', style({transform: 'translateY(100%)'}))
    ])
  ])
];

2
投票

一种方法是使用setter作为ngIf属性,并将状态设置为更新值的一部分。将属性设置为true时,需要调用detectChanges()以确保在动画状态更改之前将元素添加回dom。

StackBlitz example

example.component.ts

import { Component, AnimationTransitionEvent, OnInit } from '@angular/core';
import { trigger, state, style, animate, transition } from '@angular/animations';

@Component({
  selector: 'example',
  templateUrl: `./example.component.html`,
  styleUrls: [`./example.component.css`],
  animations: [
    trigger('state', [
      state('visible', style({
        opacity: '1'
      })),
      state('hidden', style({
        opacity: '0'
      })),
      transition('* => visible', [
        animate('500ms ease-out')
      ]),
      transition('visible => hidden', [
        animate('500ms ease-out')
      ])
    ])
  ]
})
export class ExampleComponent implements OnInit  {
  state: string;

    private _showButton: boolean;
    get showButton() {
      return this._showButton;
    }
    set showButton(val: boolean) {
      if (val) {
        this._showButton = true;
        this.state = 'visible';
      } else {
        this.state = 'hidden';
      }
    }

    constructor() {
    }

    ngOnInit() {
      this.showButton = true;
    }

    animationDone(event: AnimationTransitionEvent) {
      if (event.fromState === 'visible' && event.toState === 'hidden') {
        this._showButton = false;
      }
    }

    log() {
      console.log('clicked');
    }
}

example.component.html

<div>
  <p>animation state: {{state}}</p>
  <p>showButton: {{showButton}}</p>
  <button (click)="showButton = !showButton">toggle</button>
</div>
<button class="animation-target" *ngIf="showButton" [@state]="state" (@state.done)="animationDone($event)" (click)="log()" >animation target</button>

example.component.css

.animation-target {
    background: orange;
    height: 150px;
    width: 150px;
    cursor: pointer;
    opacity: 0;
}
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