將Ionic2 popover ngModel值傳遞給父頁面組件中的函數並調用它嗎？

Question

這就是我想要做的。

• 將組單選按鈕放在Ionic2彈出菜單中。
• 這些選項實際上是控制內容要加載的JSON文件。
• 用戶選擇一個選項，關閉彈出窗口，頁面中的內容將相應更新。

我不確定如何將值從Ionic2 Popover傳遞到其父組件。 如果我正確理解Ionic2的Popover是子組件。 但是我不知道如何傳遞[(ngModel)]值。

我知道這里看起來很雜亂……好吧，只要有人能做一個簡單的示例說明如何將價值從PopOver傳遞給Page ...

所以...全部放在一個文件中：

import {Component, Injectable, Input, Output, EventEmitter} from '@angular/core';
import {ViewController, NavController, Popover, Content, Events, NavParams} from 'ionic-angular';
import {CardService} from '../../providers/card-service/card-service';
import {LangService} from '../../providers/lang-service/lang-service';
import {GlobalService} from '../../providers/global-service';   

Popover組件：

@Component({template: `
    <ion-list  radio-group [(ngModel)]="selected"  (ionChange)="loadc(selected)"> 

        <ion-item  *ngFor="let chapter of menuArray">
            <ion-label>{{chapter.ctitle}}</ion-label>
<ion-radio value="{{chapter.cchap}}" ></ion-radio>
        </ion-item>
    </ion-list>

        `,
    providers: [CardService, LangService, GlobalService],
directives: [LangService]
})

@Injectable()
export class ChapterService{
private chpselected : any;
private menuArray: any;
    constructor(
    private viewCtrl: ViewController,
    private navController: NavController,
    public cardService: CardService,
    public langService: LangService,
    public globalService: GlobalService

    ) {
        this.menuArray = [
    {
                id: 0,
                cchap: '01',
                ctitle: 'One',
        },
    {
                id: 1,
                cchap: '02',
                ctitle: 'Two',
        },
    {
                id: 2,
                cchap: '03',
                ctitle: 'Three',
        },
];
        ///
 this.chpselected = this.menuArray[0]; 

        ///
    };

  close() {
    this.viewCtrl.dismiss();
  }

///-------------------------------
   Here I triggers an even when clicking the radio buttons in the popover. I want to call the loadCards() function in the HomePage class below so it returns what is selected and load the correct JSON in the DOM. However I do not how to pass this loadc() value to loadCards().
///-------------------------------

    loadc(x){
    console.log(x);
        this.globalService.nowchap = x;
    };


};

這里的另一個類，頁面：

@Component({
  templateUrl: 'build/pages/home/home.html',
    providers: [CardService, LangService, ChapterService, HomePage, GlobalService],
directives: [LangService]
})

@Injectable()
export class HomePage {
///  
public cards;
public viewmode : any;
    constructor(
    private navController: NavController,
    public cardService: CardService,
    public langService: LangService,
    public globalService: GlobalService
    //public chapterService: ChapterService
    ){



    this.viewmode ="read";
        this.loadCards();
    };

    /* POPOVER*/
    presentPopover(myEvent) {
    let popover = Popover.create(ChapterService);
    this.navController.present(popover, {
      ev: myEvent
    });
  }

/* Contents are loading here */
  public loadCards(x){
    console.log("this chp is "+x);
    this.cardService.load(x)
    .then(data => {
      this.cards = data;
    });

  }

/* LOAD CARDS ENDED*/    
///
}

Answer 1

無需服務，只會使事情變得復雜。

在此處查看完整的plunkr- https: //plnkr.co/edit/s6lT1a ? p = info

它是調用者，傳遞回調...

 presentPopover(myEvent) {
    let popover = Popover.create(PopoverComponent,{
      cb: function(_data) {
        alert(JSON.stringify(_data))
      }
    });

    this.nav.present(popover, {
      ev: myEvent
    });
  }

在彈出窗口中...

constructor(private params: NavParams. /* removed rest for purpose of demo */ ) {
   this.callback = this.params.get('cb')
}

public loadc(x) {

   this.callback(x)

  // Close the popover
  this.close();
}

Answer 2

這就是我想要做的。

將組單選按鈕放在Ionic2彈出菜單中。

這些選項實際上是控制內容要加載的JSON文件。

用戶選擇一個選項，關閉彈出窗口，頁面中的內容將相應更新。

通過使用共享服務來處理彈出頁面和HomePage之間的通信，您可以輕松實現這一點。 請看看這個工作的矮人 。

我已經看到您使用的是globalService所以我提出了一個小小的更改以使其像這樣工作：

import {Injectable} from '@angular/core';
import {Platform} from 'ionic-angular/index';
import {Observable} from 'rxjs/Observable';

@Injectable()
export class GlobalService { 

  // Your properties...

  public getChapterObserver: any;
  public getChapter: any;

  constructor(...){
    // Your code...

    // I'm adding an observer so the HomePage can subscribe to it
    this.getChapterObserver = null;
    this.getChapter = Observable.create(observer => {
        this.getChapterObserver = observer;
    });

  }

  // Method executed when selecting a radio from the popover
  public selectChapter(chapter : any) {
    this.getChapterObserver.next(chapter);
  }

}

然后，在您的PopoverPage ：

public loadc(x) {
    // You can call your globalService like this
    //this.globalService.selectChapter(this.menuArray[this.selected]);  

    // O by simply doing
    this.globalService.selectChapter(x);

    // Close the popover
    this.close();
}

因此，現在我們要告訴我們的服務selectChapter已更改。 最后，在您的HomePage ：

constructor(private nav: NavController, private globalService: GlobalService) {

  // We subscribe to the selectChapter event
  this.globalService.getChapter.subscribe((selectedChapter) => {
      this.selectedChapter = selectedChapter;
    });
}

這樣，我們就為HomePage訂閱了GlobalService ，因此當章節更改時，我們將被注意到，我們可以根據需要進行處理。