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我想學習Angular,並且我已經構建了一個鬧鐘。我給用戶一個複選框來選擇他們想取消的警報,我把它放在英雄中,然後在this.ui()中使用;存儲在我的10cal存儲中。如何在Angular中將服務調用到組件中?
但是我的視圖在元素被刪除後沒有改變。我怎麼做?
1)我想調用我的函數ui();在我的服務完成發佈警報後的組件中。
2)如何遞歸調用函數?
這裏是我的register.component.ts
import { Component, OnInit } from '@angular/core';
import {ValidateService} from '../../services/validate.service';
import {AlarmService} from '../../services/alarm.service';
import {FlashMessagesService} from 'angular2-flash-messages';
import {Router} from '@angular/router';
@Component({
selector: 'app-register',
templateUrl: './register.component.html',
styleUrls: ['./register.component.css']
})
export class RegisterComponent implements OnInit {
hours;
id: String;
timeid: String;
time;
heroes: any[];
name:string;
hero = [1,2,3,4,5].map(id => <any>{id:id, time: new Date(2017,5,id)})
constructor(
private validateService: ValidateService,
private FlashMessage: FlashMessagesService,
private Router: Router,
private AlarmService: AlarmService
) {
}
ngOnInit() {
this.ui();
}
ui(){
setTimeout(() => {
this.heroes = JSON.parse(localStorage.getItem('users'));
console.log(this.heroes);
}, 100);
}
check(e){
console.log(e);
console.log(e.target.checked);
console.log(e.target.value);
let get = JSON.parse(localStorage.getItem('users'));
for(var i= get.length -1 ; i > -1; i--) {
if(get[i].id == e.target.value) {
get.splice(i, 1);
}
}
localStorage.setItem('users', JSON.stringify(get));
console.log(get);
this.ui();
let time = new Date().getTime()
this.AlarmService.setUpAlarms(time);
}
}
這是我的報警服務。
import { Injectable } from '@angular/core';
import {FlashMessagesService} from 'angular2-flash-messages';
@Injectable()
export class AlarmService {
constructor(private FlashMessage: FlashMessagesService) {}
setUpAlarms(time: number){
var storage = JSON.parse(localStorage.getItem('users'));
var alarms = [];
var miliseconds = [];
var eventNow = new Date();
for(var i=0; i < storage.length; i++){
var eventEndTime = storage[i]['hours'];
var flag = storage[i]['flag'];
if (eventEndTime >= new Date()) {
alarms.push(storage[i]);
var duration = eventEndTime.valueOf() - eventNow.valueOf();
miliseconds.push(duration);
miliseconds = miliseconds.sort((a, b) => a - b);
}
}
console.log(miliseconds);
localStorage.setItem('users', JSON.stringify(alarms));
for(var i =0; i< miliseconds.length; i++){
setTimeout(() => {
this.FlashMessage.show('ALARM CLOCK WAKE UP', {cssClass: 'alert-danger', timeout: 10000});
}, miliseconds[i]);
return;
}
}
}
好了,還請你幫我嗎?我只需要調用服務中組件中的函數ui()。 –
如果您嘗試從服務中調用組件中的方法,那麼您的應用程序結構錯誤。組件可以依賴於服務,但不能以其他方式。您的組件應該訂閱服務中的observable,它將在組件完成時向組件推送一個值。查看http://blog.angular-university.io/how-to-build-angular2-apps-using-rxjs-observable-data-services-pitfalls-to-avoid/,瞭解如何在服務中使用observables – glendaviesnz