ionic 2: how to dismiss loader after data is ready? - ionic-framework

Question

In my Ionic 2 app, I have i have component that GET to fetch data.
i want to maker loader and dismiss it after data is ready.
i tried to look on other posts around the stack overflow but my issue is different.
i did something but the loader is forever and its not helps me.
It looks like following:
import { Component,ViewChild } from '#angular/core';
import { NavController,LoadingController,AlertController,ViewController} from 'ionic-angular';
import { Facebook } from 'ionic-native';
//import pages
import {LoginPage} from "../../pages/login/login";
import {User} from '../../models/user'
import { Storage} from '#ionic/storage';
//import provider
import { ProfileData } from '../../providers/profile-data';
import { NotesData } from '../../providers/notes-data';
import firebase from 'firebase'
import {AddNote} from "../add-note/add-note";
/*
Generated class for the NotesList page.
See http://ionicframework.com/docs/v2/components/#navigation for more info on
Ionic pages and navigation.
*/
#Component({
selector: 'page-notes-list',
templateUrl: 'notes-list.html'
})
export class NotesList {
//facebook user
userProfile: any = null;
uid: any = null;
fireUid:any=null;
name:string=null;
photo: any =null;
user:User=null;
photos:any=null;
currentUser:any=null;
photonew:any=null;
//notes list
notes:any=null;
data:any;
pages: Array<{title: string, component: any}>;
constructor(public navCtrl: NavController,public profileData:ProfileData,private viewCtrl: ViewController,public notesData:NotesData,private loadingCtrl: LoadingController,private alertCtrl: AlertController,public storage:Storage) {
this.data={};
this.data.title="";
this.data.desc="";
}
ionViewDidLoad() {
//if i do that the loader is forever
/*
let loader = this.loadingCtrl.create({
dismissOnPageChange: true,
});
loader.present();
*/
// here i want the loader to be until the data is ready.
this.getNotesList(); //this functions not returns data so i can't do this.getNotesList().then(()=>
}
getNotesList(){
console.log("get event");
var that=this;
this.notesData.getNotesLIst().on('value', snapshot => {
let notesList= [];
snapshot.forEach( snap => {
console.log("id note"+snap.val().id);
notesList.push({
id: snap.val().id,
title: snap.val().title,
desc: snap.val().desc,
color:snap.val().color,
photo:snap.val().photo,
});
});
that.notes = notesList;
});
}
addNote(){
this.navCtrl.push(AddNote);
}
logOutFacebook(){
Facebook.logout().then((response)=>
{
this.navCtrl.push(LoginPage);
alert(JSON.stringify(response));
},(error)=>{
alert(error);
})
}
}

Answer 1

At first, you should show how do you implement your loading page. Is it a splash screen with cordorva? Or just as div displaying some image?
If it is a splash screen, you can add this code in your component after you get data, (it is from starter template, you can see the detail by creating a new project with ionic start):
this.platform.ready().then(() => {
// Okay, so the platform is ready and our plugins are available.
// Here you can do any higher level native things you might need.
StatusBar.styleDefault();
Splashscreen.hide();
});
And, if you use a div in your index page, it is similar, you can just get that element and remove it, with pure js.

Answer 2

okay it succeed to do that
this is my answer
ionViewDidLoad() {
let loader = this.loadingCtrl.create({});
loader.present();
this.getNotesList().then((x) => {
if (x) loader.dismiss();
});
}
getNotesList(){
return new Promise(resolve => {
var that=this;
this.notesData.getNotesLIst().on('value', snapshot => {
let notesList= [];
snapshot.forEach( snap => {
console.log("id note"+snap.val().id);
notesList.push({
id: snap.val().id,
title: snap.val().title,
desc: snap.val().desc,
color:snap.val().color,
photo:snap.val().photo,
});
});
that.notes = notesList;
resolve(true);
});
})
}