Javascript 角度2的时间倒计时
我想要一个这样的日期倒计时: 但在angular 2中,我发现了这个plunkr,它每500毫秒给一个数字加1: 代码如下:Javascript 角度2的时间倒计时,javascript,angular,Javascript,Angular,我想要一个这样的日期倒计时: 但在angular 2中,我发现了这个plunkr,它每500毫秒给一个数字加1: 代码如下: import {Component,Input} from 'angular2/core'; import {Observable} from 'rxjs/Rx'; @Component({ selector: 'my-app', template: ` <div> {{message}} <
import {Component,Input} from 'angular2/core';
import {Observable} from 'rxjs/Rx';
@Component({
selector: 'my-app',
template: `
<div>
{{message}}
</div>
`
})
export class AppComponent {
constructor() {
Observable.interval(1000)
.map((x) => x+1)
.subscribe((x) => {
this.message = x;
}):
}
}
从'angular2/core'导入{组件,输入};
从'rxjs/Rx'导入{Observable};
@组成部分({
选择器:“我的应用程序”,
模板:`
{{message}}
`
})
导出类AppComponent{
构造函数(){
可观测间隔(1000)
.map((x)=>x+1)
.订阅((x)=>{
这个消息=x;
}):
}
}
但我希望在到达0之前有一秒钟的时间。从'angular2/core'导入{Component,NgOnInit,ElementRef,OnInit,OnDestroy};
import { Component, NgOnInit, ElementRef, OnInit, OnDestroy } from 'angular2/core';
import { Observable, Subscription } from 'rxjs/Rx';
@Component({
selector: 'my-app',
template: `
<div>
{{message}}
</div>
`
})
export class AppComponent implements OnInit, OnDestroy {
private future: Date;
private futureString: string;
private counter$: Observable<number>;
private subscription: Subscription;
private message: string;
constructor(elm: ElementRef) {
this.futureString = elm.nativeElement.getAttribute('inputDate');
}
dhms(t) {
var days, hours, minutes, seconds;
days = Math.floor(t / 86400);
t -= days * 86400;
hours = Math.floor(t / 3600) % 24;
t -= hours * 3600;
minutes = Math.floor(t / 60) % 60;
t -= minutes * 60;
seconds = t % 60;
return [
days + 'd',
hours + 'h',
minutes + 'm',
seconds + 's'
].join(' ');
}
ngOnInit() {
this.future = new Date(this.futureString);
this.counter$ = Observable.interval(1000).map((x) => {
return Math.floor((this.future.getTime() - new Date().getTime()) / 1000);
});
this.subscription = this.counter$.subscribe((x) => this.message = this.dhms(x));
}
ngOnDestroy(): void {
this.subscription.unsubscribe();
}
}
从“rxjs/Rx”导入{可观察,订阅};
@组成部分({
选择器:“我的应用程序”,
模板:`
{{message}}
`
})
导出类AppComponent实现OnInit、OnDestroy{
私人未来:日期;
私人未来字符串:字符串;
专用计数器$:可观察;
私人认购:认购;
私有消息:字符串;
构造函数(elm:ElementRef){
this.futureString=elm.nativeElement.getAttribute('inputDate');
}
dhms(t){
var天、小时、分钟、秒;
天数=数学下限(t/86400);
t-=天数*86400;
小时=数学楼层(t/3600)%24;
t-=小时*3600;
分钟=数学地板(t/60)%60;
t-=分钟*60;
秒=t%60;
返回[
天数+d,
小时数+小时数,
分钟数+m,
秒+秒
].加入(“”);
}
恩戈尼尼特(){
this.future=新日期(this.futureString);
此.counter$=可观察的.interval(1000).map((x)=>{
返回Math.floor((this.future.getTime()-new Date().getTime())/1000);
});
this.subscription=this.counter$.subscripte((x)=>this.message=this.dhms(x));
}
ngOnDestroy():void{
this.subscription.unsubscripte();
}
}
HTML:
正在加载。。。
这是一个稍微简化的版本,带有硬编码日期并返回四种不同的输出(天-小时-分钟-秒),您可以很好地将它们放在四个框中:
export class HomePage {
// Hardcoded date
private eventDate: Date = new Date(2018, 9, 22);
private diff: number;
private countDownResult: number;
private days: number;
private hours: number;
private minutes: number;
private seconds: number;
constructor(public navCtrl: NavController ) {
Observable.interval(1000).map((x) => {
this.diff = Math.floor((this.eventDate.getTime() - new Date().getTime()) / 1000);
}).subscribe((x) => {
this.days = this.getDays(this.diff);
this.hours = this.getHours(this.diff);
this.minutes = this.getMinutes(this.diff);
this.seconds = this.getSeconds(this.diff);
});
}
getDays(t){
return Math.floor(t / 86400);
}
getHours(t){
const days = Math.floor(t / 86400);
t -= days * 86400;
const hours = Math.floor(t / 3600) % 24;
return hours;
}
getMinutes(t){
const days = Math.floor(t / 86400);
t -= days * 86400;
const hours = Math.floor(t / 3600) % 24;
t -= hours * 3600;
const minutes = Math.floor(t / 60) % 60;
return minutes;
}
getSeconds(t){
const days = Math.floor(t / 86400);
t -= days * 86400;
const hours = Math.floor(t / 3600) % 24;
t -= hours * 3600;
const minutes = Math.floor(t / 60) % 60;
t -= minutes * 60;
const seconds = t % 60;
return seconds;
}
}
这是我最近在项目中提出的一个解决方案。它检查事件的闸门打开时间和同一事件的主事件时间。这使用Momentjs 我在onChanges函数中有代码,以防firebase中的事件时间发生变化,这是不太可能的,但我喜欢它可以随时进行更新 组成部分:
import { Component, OnInit, Input, OnChanges } from '@angular/core';
import { Observable } from "rxjs/Rx"
import { RoundService } from '../../round.service'
import * as moment from 'moment-timezone';
@Component({
selector: 'race-countdown',
templateUrl: './race-countdown.component.html',
styleUrls: ['./race-countdown.component.scss']
})
export class RaceCountdownComponent implements OnChanges,OnInit{
@Input() activeRound;
public time:number;
public timeToGates:number;
public timeToMains:number;
public countDown:Observable<any>;
public currentUnix = moment().unix();
constructor(private rs:RoundService) { }
ngOnChanges() {
this.timeToGates = this.activeRound.gateOpenUnix - this.currentUnix;
this.timeToMains = this.activeRound.mainEventUnix - this.currentUnix;
if(this.timeToGates < 0)
this.time = this.timeToMains
else
this.time = this.timeToGates
}
ngOnInit() {
this.countDown = Observable.interval(1000)
.map(res=>{ return this.time = this.time-1 })
.map(res=> {
let timeLeft = moment.duration(res, 'seconds');
let string:string = '';
// Days.
if(timeLeft.days() > 0)
string += timeLeft.days() + ' Days'
// Hours.
if(timeLeft.hours() > 0)
string += ' ' + timeLeft.hours() + ' Hours'
// Minutes.
if(timeLeft.minutes() > 0)
string += ' ' + timeLeft.minutes() + ' Mins'
// Seconds.
string += ' ' + timeLeft.seconds();
return string;
})
}
}
import {Component, OnInit} from '@angular/core';
import {Time, TimerService} from '../timer.service';
@Component({
selector: 'app-timer',
template: `
<ng-container *ngIf="time1$ | async as time1"
<pre>{{time1.days}}days {{time1.hours}}hours {{time1.minutes}} minutes {{time1.seconds}}seconds<pre>
<br>
<ng-container>
<ng-container *ngIf="time2$ | async as time2"
<pre>{{time2.days}}days {{time2.hours}}hours {{time2.minutes}} minutes {{time2.seconds}}seconds<pre>
<br>
<ng-container>
`
})
export class TimerComponent implements OnInit {
time1$: Observable<Time>;
time2$: Observable<Time>;
constructor(private timerService: TimerService) {}
ngOnInit() {
this.time1$ = this.timerService.timer(new Date('June 4, 2020 15:37:25'))
this.time2$ = this.timerService.timer(new Date('August 9, 2041 15:37:25'))
}
从'@angular/core'导入{Component,OnInit,Input,OnChanges};
从“rxjs/Rx”导入{Observable}
从“../../round.service”导入{RoundService}
从“时刻时区”导入*作为时刻;
@组成部分({
选择器:“比赛倒计时”,
templateUrl:'./race countdown.component.html',
样式URL:['./比赛倒计时.component.scss']
})
导出类RaceCountdownComponent实现OnChanges、OnInit{
@输入()活动轮;
公众时间:数字;
公共时间:数字;
公共计时器:数字;
公众倒数:可见;
public currentUnix=moment().unix();
构造函数(专用rs:RoundService){}
ngOnChanges(){
this.timeToGates=this.activeRound.gateOpenUnix-this.currentUnix;
this.timeToMains=this.activeRound.mainEventUnix-this.currentUnix;
如果(this.timeToGates<0)
this.time=this.timeToMains
其他的
this.time=this.timeToGates
}
恩戈尼尼特(){
this.countDown=可观察的间隔(1000)
.map(res=>{返回this.time=this.time-1})
.map(res=>{
让timeLeft=时刻持续时间(res,'秒');
让string:string='';
//天。
如果(timeLeft.days()>0)
字符串+=timeLeft.days()+“days”
//时间。
如果(timeLeft.hours()>0)
字符串+=''+timeLeft.hours()+'hours'
//分钟。
如果(timeLeft.minutes()>0)
字符串+=''+timeLeft.minutes()+'Mins'
//秒。
字符串+=''+timeLeft.seconds();
返回字符串;
})
}
}
HTML:
{{倒计时|异步}
产生:
“2天6小时59分钟42”等对约翰尼菲蒂齐奥的答案做了一些修改
我认为将计时器创建为服务更有意义,这样在创建视图时就可以有更多的灵活性(在组件中使用返回的时间模型)。它在订阅时创建一个新的可观察对象,以便每个订户都获得自己的可观察对象。简而言之,您可以使用此服务同时创建任意数量的计时器。请确保将此服务包括在AppModule提供程序的阵列中,以便您可以在整个应用程序中使用它 服务:
import { Injectable } from '@angular/core';
import {Observable} from 'rxjs/Observable';
import 'rxjs/add/observable/defer';
import 'rxjs/add/observable/interval';
import 'rxjs/add/operator/map';
export interface Time {
days: number;
hours: number;
minutes: number;
seconds: number;
}
@Injectable()
export class TimerService {
constructor() { }
private createTimeObject(date: Date): Time {
const now = new Date().getTime();
const distance = date.getTime() - now;
let time: Time = {days: 0, hours: 0, minutes: 0, seconds: 0};
time.days = Math.floor(distance / (1000 * 60 * 60 * 24));
time.hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
time.minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
time.seconds = Math.floor((distance % (1000 * 60)) / 1000);
return time;
}
timer(date: Date): Observable<Time> {
return Observable.interval(1000)
.map(() => this.createTimeObject(date))
}
}
从'@angular/core'导入{Injectable};
从“rxjs/Observable”导入{Observable};
导入“rxjs/add/observable/defer”;
导入“rxjs/add/observable/interval”;
导入'rxjs/add/operator/map';
导出接口时间{
天数:个数;
小时数:个;
分钟:数字;
秒:数字;
}
@可注射()
导出类TimerService{
构造函数(){}
私有createTimeObject(日期:日期):时间{
const now=new Date().getTime();
const distance=date.getTime()-现在;
让
import {Observable} from 'rxjs/Rx';
import {Component, OnInit} from '@angular/core';
export class TimerComponent implements OnInit {
private _trialEndsAt;
private _diff: number;
private _days: number;
private _hours: number;
private _minutes: number;
private _seconds: number;
constructor() {}
ngOnInit() {
this._trialEndsAt = "2017-02-28";
Observable.interval(1000).map((x) => {
this._diff = Date.parse(this._trialEndsAt) - Date.parse(new Date().toString());
}).subscribe((x) => {
this._days = this.getDays(this._diff);
this._hours = this.getHours(this._diff);
this._minutes = this.getMinutes(this._diff);
this._seconds = this.getSeconds(this._diff);
});
}
getDays(t){
return Math.floor( t/(1000*60*60*24) );
}
getHours(t){
return Math.floor( (t/(1000*60*60)) % 24 );
}
getMinutes(t){
return Math.floor( (t/1000/60) % 60 );
}
getSeconds(t){
return Math.floor( (t/1000) % 60 );
}
}
import { Injectable } from '@angular/core';
import {Observable} from 'rxjs/Observable';
import 'rxjs/add/observable/defer';
import 'rxjs/add/observable/interval';
import 'rxjs/add/operator/map';
export interface Time {
days: number;
hours: number;
minutes: number;
seconds: number;
}
@Injectable()
export class TimerService {
constructor() { }
private createTimeObject(date: Date): Time {
const now = new Date().getTime();
const distance = date.getTime() - now;
let time: Time = {days: 0, hours: 0, minutes: 0, seconds: 0};
time.days = Math.floor(distance / (1000 * 60 * 60 * 24));
time.hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
time.minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
time.seconds = Math.floor((distance % (1000 * 60)) / 1000);
return time;
}
timer(date: Date): Observable<Time> {
return Observable.interval(1000)
.map(() => this.createTimeObject(date))
}
}
import {Component, OnInit} from '@angular/core';
import {Time, TimerService} from '../timer.service';
@Component({
selector: 'app-timer',
template: `
<ng-container *ngIf="time1$ | async as time1"
<pre>{{time1.days}}days {{time1.hours}}hours {{time1.minutes}} minutes {{time1.seconds}}seconds<pre>
<br>
<ng-container>
<ng-container *ngIf="time2$ | async as time2"
<pre>{{time2.days}}days {{time2.hours}}hours {{time2.minutes}} minutes {{time2.seconds}}seconds<pre>
<br>
<ng-container>
`
})
export class TimerComponent implements OnInit {
time1$: Observable<Time>;
time2$: Observable<Time>;
constructor(private timerService: TimerService) {}
ngOnInit() {
this.time1$ = this.timerService.timer(new Date('June 4, 2020 15:37:25'))
this.time2$ = this.timerService.timer(new Date('August 9, 2041 15:37:25'))
}
import {map} from 'rxjs/internal/operators';
import { Component, OnInit } from '@angular/core';
import {interval, Observable} from 'rxjs';
@Component({
selector: 'app-countdown',
templateUrl: './countdown.component.html',
styleUrls: ['./countdown.component.css']
})
export class CountdownComponent implements OnInit {
private _trialEndsAt;
private _diff: number;
private _days: number;
private _hours: number;
private _minutes: number;
private _seconds: number;
constructor() {}
ngOnInit() {
this._trialEndsAt = "2017-02-28";
interval(3000).pipe(
map((x) => {this._diff = Date.parse(this._trialEndsAt) - Date.parse(new Date().toString());
})).subscribe((x) => {
this._days = this.getDays(this._diff);
this._hours = this.getHours(this._diff);
this._minutes = this.getMinutes(this._diff);
this._seconds = this.getSeconds(this._diff);
});
}
getDays(t) {
return Math.floor( t / (1000 * 60 * 60 * 24) );
}
getHours(t) {
return Math.floor( (t / (1000 * 60 * 60)) % 24 );
}
getMinutes(t) {
return Math.floor( (t / 1000 / 60) % 60 );
}
getSeconds(t) {
return Math.floor( (t / 1000) % 60 );
}
}