我是Angular的新手,并尝试设置 smoothScroll :https://github.com/kavil/ng2SmoothScroll
我的视图设置如下:
<piiick-one smoothScroll offset="10" [scrollIf]="step === 1"></piiick-one>
<piiick-two *ngIf="max >= 2" smoothScroll offset="10" [scrollIf]="step === 2"></piiick-two>
<piiick-three *ngIf="max >= 3" smoothScroll offset="10" [scrollIf]="step === 3"></piiick-three>
<piiick-results *ngIf="max >= 4" smoothScroll offset="10" [scrollIf]="step === 4"></piiick-results>
组件的设置如下:
export class StepsComponent implements DoCheck {
step: number = 0;
max: number = 0;
private path: string;
constructor(
private route: ActivatedRoute
) {
this.route.params.subscribe(params => this.path = params.path)
}
ngDoCheck() {
switch (this.path) {
case 'one': this.changeStep(1); break;
case 'two': this.changeStep(2); break;
case 'three': this.changeStep(3); break;
case 'results': this.changeStep(4); break;
default: this.changeStep(0); break;
}
}
private changeStep(step) {
var current = this.step;
this.step = step;
if (step > current) {
this.max = step;
}
}
}
应该发生的是,当调用路由/steps/three
时,它将 smoothScroll 到ID为 3 的div。
这一直有效,直到我打开页面过渡动画。
我现在在我的app.component
中有以下代码:
import { Component } from '@angular/core';
import { query, style, animate, trigger, transition, group } from '@angular/animations';
const routerTransition = trigger('routerTransition', [
transition('* => home', [
query(':enter, :leave', style({ position: 'fixed', width:'100%' })
, { optional: true }),
group([
query(':enter', [
style({ transform: 'translateX(-100%)' }),
animate('0.5s ease-in-out', style({ transform: 'translateX(0%)' }))
], { optional: true }),
query(':leave', [
style({ transform: 'translateX(0%)' }),
animate('0.5s ease-in-out', style({ transform: 'translateX(100%)' }))
], { optional: true }),
])
]),
transition('* => steps', [
group([
query(':enter, :leave', style({ position: 'fixed', width:'100%' })
, { optional: true }),
query(':enter', [
style({ transform: 'translateX(100%)' }),
animate('0.5s ease-in-out', style({ transform: 'translateX(0%)' }))
], { optional: true }),
query(':leave', [
style({ transform: 'translateX(0%)' }),
animate('0.5s ease-in-out', style({ transform: 'translateX(-100%)' }))
], { optional: true }),
])
])
])
@Component({
selector: 'piiick-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.scss'],
animations: [routerTransition]
})
export class AppComponent {
prepareRouteTransition(outlet) {
return outlet.activatedRouteData.state;
}
}
注释animations
时,smoothScroll起作用;但启用后,smoothScroll不会触发。
有人知道为什么吗?
答案 0 :(得分:0)
我想我找到了答案。 如果找到了一个帖子,其中有人在演示如何在动画完成后触发事件。 因此,我这样创建了一个 AnimationService :
import { Injectable } from '@angular/core';
import { Subject } from 'rxjs/Subject';
@Injectable()
export class AnimationService {
private animatingSubject = new Subject<boolean>();
animating = this.animatingSubject.asObservable();
constructor() { }
loading(state: boolean) {
this.animatingSubject.next(state);
}
}
,用于设置动画状态。 我创建了一个 Animations 组件,就像下面这样:
<div [@routerTransition]="prepareRouteTransition(outlet)" (@routerTransition.start)="handleStart()" (@routerTransition.done)="handleDone()">
<router-outlet #outlet="outlet"></router-outlet>
</div>
,它像这样放在我的 App.Component 中:
<piiick-header></piiick-header>
<piiick-animations></piiick-animations>
<piiick-spinner></piiick-spinner>
组件代码如下:
import { Component } from '@angular/core';
import { query, style, animate, trigger, transition, group } from '@angular/animations';
import { AnimationService } from '../../core/services/animation.service';
const routerTransition = trigger('routerTransition', [
transition('* => home', [
query(':enter, :leave', style({ position: 'fixed', width:'100%' })
, { optional: true }),
group([
query(':enter', [
style({ transform: 'translateX(-100%)' }),
animate('0.5s ease-in-out', style({ transform: 'translateX(0%)' }))
], { optional: true }),
query(':leave', [
style({ transform: 'translateX(0%)' }),
animate('0.5s ease-in-out', style({ transform: 'translateX(100%)' }))
], { optional: true }),
])
]),
transition('* => steps', [
group([
query(':enter, :leave', style({ position: 'fixed', width:'100%' })
, { optional: true }),
query(':enter', [
style({ transform: 'translateX(100%)' }),
animate('0.5s ease-in-out', style({ transform: 'translateX(0%)' }))
], { optional: true }),
query(':leave', [
style({ transform: 'translateX(0%)' }),
animate('0.5s ease-in-out', style({ transform: 'translateX(-100%)' }))
], { optional: true }),
])
])
])
@Component({
selector: 'piiick-animations',
templateUrl: './animations.component.html',
styleUrls: ['./animations.component.scss'],
animations: [routerTransition]
})
export class AnimationsComponent {
constructor(private animationService: AnimationService) { }
prepareRouteTransition(outlet) {
return outlet.activatedRouteData.state;
}
handleStart(e) {
this.animationService.loading(true);
}
handleDone(e) {
this.animationService.loading(false);
}
}
如您所见,动画开始时,它将更新 AnimationService 并将动画属性设置为true,当动画完成时,它将再次更新服务并将属性设置为false
现在,它只是可以与 smoothScroll 一起使用。 起初,我无法使它起作用,然后我发现,这不仅是我必须等待的动画,而且内容也是如此。因此我在 StepsComponent 中添加了一个属性,该属性在视图初始化后已更新。
我将HTML更新为:
<div *ngIf="scrollIf">
<piiick-one smoothScroll offset="10" [scrollIf]="step === 1"></piiick-one>
<piiick-two *ngIf="max >= 2" smoothScroll offset="10" [scrollIf]="step === 2"></piiick-two>
<piiick-three *ngIf="max >= 3" smoothScroll offset="10" [scrollIf]="step === 3"></piiick-three>
<piiick-results *ngIf="max >= 4" smoothScroll offset="10" [scrollIf]="step === 4"></piiick-results>
<piiick-navigation></piiick-navigation>
</div>
,然后将代码更改为此:
export class StepsComponent implements DoCheck, AfterViewInit {
step: number = 0;
max: number = 0;
scrollIf: boolean = false;
private path: string;
private afterViewInit: boolean;
private viewAnimating: boolean;
constructor(
private route: ActivatedRoute,
private animationService: AnimationService
) {
this.route.params.subscribe(params => this.path = params.path);
this.animationService.animating.subscribe(animating => this.viewAnimating = animating);
}
ngAfterViewInit() {
this.afterViewInit = true;
}
ngDoCheck() {
if (this.afterViewInit) {
switch (this.path) {
case 'one': this.changeStep(1); break;
case 'two': this.changeStep(2); break;
case 'three': this.changeStep(3); break;
case 'results': this.changeStep(4); break;
default: this.changeStep(0); break;
}
this.scrollIf = this.afterViewInit && !this.viewAnimating;
}
}
private changeStep(step) {
var current = this.step;
this.step = step;
if (step > current) {
this.max = step;
}
}
}
现在,动画和smoothScroll可以工作了。我所遇到的唯一问题是,视图在初始化之前不会显示。我不确定这是否有问题。