How to "transfer" date from page into side-menu in Ionic2, i.e - Having app.page.html like following:

<ion-menu [content]="content">

    <ion-content class="menu-left">
        <!-- User profile -->
        <div text-center padding-top padding-bottom class="primary-bg menu-left">
            <a menuClose>
                <h4 light>{{userName}}</h4>
            </a>
        </div>

        <ion-list class="list-full-border">
            <button ion-item menuClose *ngFor="let page of pages" (click)="openPage(page)">
        <ion-icon item-left name="{{ page.icon }}"></ion-icon>
        {{ page.title }}
        <ion-badge color="danger" item-right *ngIf="page.count">{{ page.count }}</ion-badge>
      </button>
        </ion-list>
    </ion-content>

</ion-menu>

<ion-nav [root]="rootPage" #content swipeBackEnabled="false"></ion-nav>

how to update userName value upon the action in the page upon the data gotten from facebookLogin.page ?

facebookLogin.page.ts:

...
fbLogin() {
    Facebook.login(["public_profile", "email"])
      .then((resp: FacebookLoginResponse) => {

        if (resp.status === "connected") {
          Facebook.api("/me", ["public_profile", "email"])
            .then(res => {
             this.userName = res.name
              this.login({name: this.userName})
            })
        ...
      );
  }

 login(params) {
    this.nav.setRoot(HomePage, params);
  }
...

(so, how would I import the userName which I get after login with facebook into ion-sideMenu in app.html; how I could make EventEmmiter, service/observe for changes in app.html's ion-menu ... some other way?)

How to "transfer" date from page into side-menu in Ionic2, i.e - Having app.page.html like following:

<ion-menu [content]="content">

    <ion-content class="menu-left">
        <!-- User profile -->
        <div text-center padding-top padding-bottom class="primary-bg menu-left">
            <a menuClose>
                <h4 light>{{userName}}</h4>
            </a>
        </div>

        <ion-list class="list-full-border">
            <button ion-item menuClose *ngFor="let page of pages" (click)="openPage(page)">
        <ion-icon item-left name="{{ page.icon }}"></ion-icon>
        {{ page.title }}
        <ion-badge color="danger" item-right *ngIf="page.count">{{ page.count }}</ion-badge>
      </button>
        </ion-list>
    </ion-content>

</ion-menu>

<ion-nav [root]="rootPage" #content swipeBackEnabled="false"></ion-nav>

how to update userName value upon the action in the page upon the data gotten from facebookLogin.page ?

facebookLogin.page.ts:

...
fbLogin() {
    Facebook.login(["public_profile", "email"])
      .then((resp: FacebookLoginResponse) => {

        if (resp.status === "connected") {
          Facebook.api("/me", ["public_profile", "email"])
            .then(res => {
             this.userName = res.name
              this.login({name: this.userName})
            })
        ...
      );
  }

 login(params) {
    this.nav.setRoot(HomePage, params);
  }
...

(so, how would I import the userName which I get after login with facebook into ion-sideMenu in app.html; how I could make EventEmmiter, service/observe for changes in app.html's ion-menu ... some other way?)

• javascript
• angular
• typescript
• ionic2
• ionic3

• What is facebookLogin.page? Show some code. – Sergey Sokolov Commented Dec 22, 2016 at 9:43
• Add it to the post, please – Sergey Sokolov Commented Dec 22, 2016 at 9:48
• I don't understand why you request another way instead of observing for changes? That's the best way in my opinion, makes it easier to log out and login with different socialmedia and different pages. – Ivar Reukers Commented Dec 22, 2016 at 10:13

1 Answer 1

ionic2 - using Events

Check out the Events docs

They allow you to 'publish' an action from any page, and subscribe to it in another page to retrieve the value. Your scenario would look a bit like this.

Import (both on Facebooklogin.ponent and app.ponent)

import { Events } from 'ionic-angular'; and in your constructor constructor(public events: Events)

Then, whenever you change your userName (f.e. in the handler of the facebook login) publish the value like this.

fbLogin() {
    Facebook.login(["public_profile", "email"])
      .then((resp: FacebookLoginResponse) => {

        if (resp.status === "connected") {
          Facebook.api("/me", ["public_profile", "email"])
            .then(res => {
             this.userName = res.name
             // publish the username change to the events
             this.events.publish('username:changed', this.userName);
              this.login({name: this.userName})
            })
        //...
      );
  }

And subscribe to any publishes being made in your app.ponent

userName: string;

constructor(events: Events) {
   this.userName = "not logged in";

   events.subscribe('username:changed', username => {
      if(username !== undefined && username !== ""){
        this.userName = username;
      }
   }) //... 
}

angular2 - using EventEmitter

import { EventEmitter } from '@angular/core';

public userChanged = new EventEmitter();

fbLogin() {
        Facebook.login(["public_profile", "email"])
          .then((resp: FacebookLoginResponse) => {

            if (resp.status === "connected") {
              Facebook.api("/me", ["public_profile", "email"])
                .then(res => {
                 this.userName = res.name
                 // publish the username change to the events
                 this.userChanged.emit(this.userName);
                 this.login({name: this.userName})
                })
            ...
          );
      }

App.ponent

import { FacebookLogin } from '../pages/facebook/facebook.ponent';

public userName;

constructor(fb: FacebookLogin){

    this.userName = "";
    //subscribe to the page's EventEmitter
    this.fb.userChanged.subscribe(username => {
       this.userName = username;
    });
}

OR use the EventEmitter as an Output as described in this S.O. answer: What is the proper use of an EventEmitter?