如何更新 ionic 2 侧菜单中的值

问题描述

如何将日期从页面转移"到 Ionic2 中的 side-menu，即 -具有 app.page.html 如下:

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>

如何根据从 facebookLogin.page 获取的数据在页面中的操作上更新 userName 值?

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);
  }
...

(那么，我如何将使用 facebook 登录后获得的 userName 导入 app.html 中的 ion-sideMenu 中；如何我可以让 EventEmmiter、service/observe 来观察 app.html 的 ion-menu 的变化……其他方式?)

(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?)

推荐答案

ionic2 - 使用事件

查看活动文档

它们允许您从任何页面发布"操作，并在另一个页面中订阅它以检索值.你的场景看起来有点像这样.

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.

导入(在 Facebooklogin.component 和 app.component 上)

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

import { Events } from 'ionic-angular'; 和你的构造函数 constructor(public events: Events)

然后，每当您更改 userName(例如在 facebook 登录的处理程序中)时，都会像这样发布值.

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})
            })
        //...
      );
  }

并订阅在您的 app.component 中进行的任何发布

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

userName: string;

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

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

<小时>

angular2 - 使用 EventEmitter

---

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.component

App.component

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

public userName;

constructor(fb: FacebookLogin){

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

或使用 EventEmitter 作为 Output，如本 S.O. 中所述.回答:EventEmitter 的正确用法是什么?

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

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