angular 2 ngIf 和 CSS 过渡/动画
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angular 2 ngIf and CSS transition/animation
提问by Han Che
I want a div to slide in from the right in angular 2 using css.
我想要一个 div 使用 css 从 angular 2 的右侧滑入。
<div class="note" [ngClass]="{'transition':show}" *ngIf="show">
<p> Notes</p>
</div>
<button class="btn btn-default" (click)="toggle(show)">Toggle</button>
I works fine if i only use [ngClass] to toggle class and utilise opacity. But li don't want that element to be rendered from the beginning so I "hide" it with ngIf first, but then the transition wont't work.
如果我只使用 [ngClass] 来切换类并利用不透明度，我工作得很好。但是 li 不希望该元素从一开始就呈现，所以我首先用 ngIf “隐藏”它，但是转换将不起作用。
.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;
}
回答by Günter Z?chbauer
update 4.1.0
更新 4.1.0
See also https://github.com/angular/angular/blob/master/CHANGELOG.md#400-rc1-2017-02-24
另见https://github.com/angular/angular/blob/master/CHANGELOG.md#400-rc1-2017-02-24
update 2.1.0
更新 2.1.0
For more details see Animations at angular.io
有关更多详细信息，请参阅angular.io 上的动画
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;
}
original
原来的
*ngIfremoves the element from the DOM when the expression becomes false. You can't have a transition on a non-existing element.
*ngIf当表达式变为 时，从 DOM 中删除元素false。您不能对不存在的元素进行过渡。
Use instead hidden:
改用hidden：
<div class="note" [ngClass]="{'transition':show}" [hidden]="!show">
回答by Asaf Hananel
According to the latest angular 2 documentationyou can animate "Entering and Leaving" elements(like in angular 1).
根据最新的angular 2 文档，您可以为“进入和离开”元素设置动画（如 angular 1）。
Example of simple fade animation:
简单的淡入淡出动画示例：
In relevant @Component add:
在相关的@Component 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}))
])
])
]
Do not forget to add imports
不要忘记添加导入
import {style, state, animate, transition, trigger} from '@angular/animations';
The relevant component's html's element should look like:
相关组件的 html 元素应如下所示：
<div *ngIf="toggle" [@fadeInOut]>element</div>
I built example of slide and fade animationhere.
我在这里构建了幻灯片和淡入淡出动画的示例。
Explanationon 'void' and '*':
说明在“无效”和“*”：
voidis the state whenngIfis set to false (it applies when the element is not attached to a view).*- There can be many animation states (read more in docs). The*state takes precedence over all of them as a "wildcard" (in my example this is the state whenngIfis set totrue).
void是ngIf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（在文档中阅读更多内容）。该*状态优先于所有的人都为“通配符”（在我的例子，这是当状态ngIf设置为true）。
Notice(taken from angular docs):
注意（取自 angular 文档）：
Extradeclare inside the app module,
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
在 app 模块中额外声明，
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
Angular animations are built on top of the standard Web Animations API and run natively on browsers that support it. For other browsers, a polyfill is required. Grab web-animations.min.js from GitHub and add it to your page.
Angular 动画建立在标准的 Web Animations API 之上，并在支持它的浏览器上本地运行。对于其他浏览器，需要一个 polyfill。从 GitHub 获取 web-animations.min.js 并将其添加到您的页面。
回答by kravits88
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: '*' }))
])
])
回答by Mike
CSS only solution for modern browsers
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;
}
回答by JayChase
One way is to use a setter for the ngIf property and set the state as part of updating the value.
一种方法是对 ngIf 属性使用 setter 并将状态设置为更新值的一部分。
fade.component.ts
淡入淡出.component.ts
import {
animate,
AnimationEvent,
state,
style,
transition,
trigger
} from '@angular/animations';
import { ChangeDetectionStrategy, Component, Input } from '@angular/core';
export type FadeState = 'visible' | 'hidden';
@Component({
selector: 'app-fade',
templateUrl: './fade.component.html',
styleUrls: ['./fade.component.scss'],
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')])
])
],
changeDetection: ChangeDetectionStrategy.OnPush
})
export class FadeComponent {
state: FadeState;
// tslint:disable-next-line: variable-name
private _show: boolean;
get show() {
return this._show;
}
@Input()
set show(value: boolean) {
if (value) {
this._show = value;
this.state = 'visible';
} else {
this.state = 'hidden';
}
}
animationDone(event: AnimationEvent) {
if (event.fromState === 'visible' && event.toState === 'hidden') {
this._show = false;
}
}
}
fade.component.html
淡入淡出.component.html
<div
*ngIf="show"
class="fade"
[@state]="state"
(@state.done)="animationDone($event)"
>
<button mat-raised-button color="primary">test</button>
</div>
example.component.css
例子.component.css
:host {
display: block;
}
.fade {
opacity: 0;
}
回答by ramon22
Am using angular 5 and for an ngif to work for me that is in a ngfor, I had to use animateChild and in the user-detail component I used the *ngIf="user.expanded" to show hide user and it worked for entering a leaving
我正在使用 angular 5 并且对于在 ngfor 中为我工作的 ngif，我必须使用 animateChild 并且在用户详细信息组件中我使用了 *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%)'}))
])
])
];
回答by Anonymoose
In my case I declared the animation on the wrong component by mistake.
就我而言，我错误地在错误的组件上声明了动画。
app.component.html
应用程序组件.html
<app-order-details *ngIf="orderDetails" [@fadeInOut] [orderDetails]="orderDetails">
</app-order-details>
The animation needs to be declared on the component where the element is used in (appComponent.ts). I was declaring the animation on OrderDetailsComponent.tsinstead.
动画需要在 ( appComponent.ts) 中使用元素的组件上声明。我正在声明动画OrderDetailsComponent.ts。
Hopefully it will help someone making the same mistake
希望它能帮助犯同样错误的人
