如何在Ionic中的选项卡之间传递数据

Question

我有一个带有3个选项卡的简单项目.当用户点击第一个标签上的项目上的按钮时,我需要该项目移动到第二个标签,反之亦然.(当发生这种情况时,我还需要通知服务器).有没有办法让我将项目对象传递给About-Page选项卡中的数组,反之亦然？

home.html的

<ion-header>
  <ion-toolbar>
    <ion-title>Home</ion-title>
    <ion-buttons end>
      <button ion-button icon-only color="royal" (click)="updateData()">
        <ion-icon name="refresh"></ion-icon>
      </button>
    </ion-buttons>
  </ion-toolbar>
</ion-header>

<ion-content>
  <ion-list>
    <ion-item-sliding *ngFor="let item of items">
      <ion-item>
        <ion-icon name="alert" *ngIf="!item.taken" item-left></ion-icon>
        <ion-icon name="checkmark-circle-outline" *ngIf="item.taken" item-left></ion-icon>
        <h2><b>{{item.title}}</b></h2>
        <h3>{{item.name}} | {{item.number}}</h3>
        <h3 style="white-space: normal;"><b>Details:</b> {{item.text}}</h3>
      </ion-item>
      <ion-item-options side="left">
        <button ion-button color="primary" (click)="smsPressed(item)">
          <ion-icon name="text"></ion-icon>
          Text
        </button>
        <button ion-button color="secondary" (click)="phonePressed(item)">
          <ion-icon name="call"></ion-icon>
          Call
        </button>
      </ion-item-options>
      <ion-item-options side="right">
        <button ion-button color="primary" *ngIf="item.taken" (click)="responderPressed(item)">
          <ion-icon name="person"></ion-icon>
          Responder
        </button>
        <button ion-button color="primary" *ngIf="!item.taken" (click)="takecallPressed(item)">
          <ion-icon name="navigate"></ion-icon>
          Take Call
        </button>
      </ion-item-options>
    </ion-item-sliding>
  </ion-list>

  <ion-fab right bottom>
    <button ion-fab color="light" (click)="addItem()"><ion-icon name="add"></ion-icon></button>
  </ion-fab>
</ion-content>

home.ts

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { AlertController } from 'ionic-angular';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
  items: any[];

  constructor(public navCtrl: NavController, public alertCtrl: AlertController) {
    this.items = []
      this.items.push({
        title: "Title",
        text: "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam pretium quam at est porta fringilla.",
        name: "Sam",
        number: "(555) 555-5555",
        taken: true,
        responder: {
          name: "Bob",
          phone: "(666) 666-6666"
        }
      })
      this.items.push({
        title: "Stuff",
        text: "Take Now",
        name: "Sam",
        number: "(555) 555-5555",
        taken: false,
        responder: {}
      })

  }

  buttonPressed(item){
    alert(item.title)
  }

  smsPressed(item){alert(item.number)}

  phonePressed(item){alert(item.number)}

  responderPressed(item){alert(item.responder.name)}

  takecallPressed(item){alert(item.taken)}

  updateData(){
    this.items.unshift({
      title: "Added",
      text: "Take Now",
      name: "Sam",
      number: "(555) 555-5555",
      taken: false,
      responder: {}
    })
  }

  addItem(){
    let prompt = this.alertCtrl.create({
      title: 'Add Call',
      message: "Enter the details for the call you want to add",
      inputs: [
        { name: 'title',  placeholder: 'Title'},
        { name: 'text',  placeholder: 'Details'},
        { name: 'name',  placeholder: 'Name'},
        { name: 'number',  placeholder: 'Number'},
      ],
      buttons: [
        { text: 'Cancel',handler: data => {}},
        { text: 'Save',handler: data => {
            this.items.unshift({
              title: data.title,text: data.text,
              name: data.name,number: data.number,
              taken: false,responder: {}
            })
          }
        }
      ]
    });
    prompt.present();
  }
}

tabs.html

<ion-tabs>
      <ion-tab [root]="tab1Root" tabTitle="Home" tabIcon="home"></ion-tab>
      <ion-tab [root]="tab2Root" tabTitle="Current" tabIcon="alarm"></ion-tab>
      <ion-tab [root]="tab3Root" tabTitle="Account" tabIcon="contacts"></ion-tab>
</ion-tabs>

tabs.ts

import { Component } from '@angular/core';
import { HomePage } from '../home/home';
import { AboutPage } from '../about/about';
import { ContactPage } from '../contact/contact';

@Component({
  templateUrl: 'tabs.html'
})
export class TabsPage {
  // this tells the tabs component which Pages
  // should be each tab's root Page
  tab1Root: any = HomePage;
  tab2Root: any = AboutPage;
  tab3Root: any = ContactPage;

  constructor() {

  }
}

Answer 1

有几种方法可以实现这一目标.

1. Events 在不同页面之间传递数据时,它将是正确的选择.

   事件是一种发布 - 订阅样式事件系统,用于在整个应用程序中发送和响应应用程序级事件.

   用.创建一个事件

   constructor(public events: Events) {}
   function sendData(data) {
     events.publish('data:created', data);
   }
   

   订阅使用

   events.subscribe('data:created', (data) => { console.log( data); });

2. 使用共享服务

   constructor(public shared: Share) {} pushData(data){ this.shared.items.push(data); }

   items在this.shared.items全局注入服务时,可以使用其他组件访问app.module.ts

3. 另一种选择是使用segments而不是tabs.这取决于用例.对于简单的应用程序,这将是更好的解决方案.您可以从文档中了解更多信息.

编辑

我避免将数据存储在数据库中,因为它不是一种有效的方法.但是这种方法可能有用例.