Question

我在使用Ionic2在页面之间导航时遇到了一些问题。

我有一个数据列表，我从data.json

获得

这是列表

我想了解详情：

示例 - 来自＆＃34; A＆＃34;

我的数据/ Example.Json

上的数据

 {
  "title": "A",
  "lat": 2.323733,
  "lon": 64,546465
},

所以，一旦我点击标题，我想在新页面上获得标题，lat和lon。

app.modules.ts

    import { NgModule, ErrorHandler } from '@angular/core';
import { IonicApp, IonicModule, IonicErrorHandler } from 'ionic-angular';
import { MyApp } from './app.component';
import { HomePage } from '../pages/home/home';
import { MapPage } from '../pages/map/map';
import { ListPage } from '../pages/list/list';
import { DetailPage } from '../pages/detail/detail';
import { Locations } from '../providers/locations';
import { GoogleMaps } from '../providers/google-maps';
import { Connectivity } from '../providers/connectivity';
declare var google: any;

@NgModule({
  declarations: [
    MyApp,
    HomePage,
    MapPage,
    ListPage,
    DetailPage
  ],
  imports: [
    IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    HomePage,
    MapPage,
    ListPage,
    DetailPage
  ],
  providers: [{provide: ErrorHandler, useClass: IonicErrorHandler},Locations,GoogleMaps, Connectivity]
})
export class AppModule {}

    import { NgModule, ErrorHandler } from '@angular/core';
import { IonicApp, IonicModule, IonicErrorHandler } from 'ionic-angular';
import { MyApp } from './app.component';
import { HomePage } from '../pages/home/home';
import { MapPage } from '../pages/map/map';
import { ListPage } from '../pages/list/list';
import { DetailPage } from '../pages/detail/detail';
import { Locations } from '../providers/locations';
import { GoogleMaps } from '../providers/google-maps';
import { Connectivity } from '../providers/connectivity';
declare var google: any;

@NgModule({
  declarations: [
    MyApp,
    HomePage,
    MapPage,
    ListPage,
    DetailPage
  ],
  imports: [
    IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    HomePage,
    MapPage,
    ListPage,
    DetailPage
  ],
  providers: [{provide: ErrorHandler, useClass: IonicErrorHandler},Locations,GoogleMaps, Connectivity]
})
export class AppModule {}

PageA.ts（数据列表）

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { Locations } from '../../providers/locations';
import { DetailPage } from '../detail/detail';


@Component({
  selector: 'page-list',
  templateUrl: 'list.html'
})
export class ListPage {


  constructor(public navCtrl: NavController, public locations: Locations) {

  }

  ionViewDidLoad() {
    console.log('Test Si marche');


  }

  viewLocation(event,location) {
    this.navCtrl.push(DetailPage, {
      "title":location.title,
      "longitude":location.longitude
    })
  }

}

页面B（我想在点击列表中的内容后立即获取详细信息）

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import {NavParams} from "ionic-angular";
import { Locations} from '../../providers/locations';
import { ListPage } from '../list/list';





@Component({
    selector: 'page-detail',
    templateUrl: 'detail.html',
    providers: [ Locations ],
    entryComponents:[ ListPage ]
})


export class DetailPage {

    title: string
    latitude: string
    navParams: NavParams

    constructor(navParams: NavParams,public navCtrl: NavController) {
        this.navParams = navParams
        this.title = this.navParams.get('title');
        this.latitude = this.navParams.get('latitude');
    }

    ionViewDidLoad(err) {
        console.log(err);


    }
    goBack() {
        this.navCtrl.pop();
    }

}

listA.html

 <ion-header>

    <ion-navbar color="secondary">
        <ion-title>List</ion-title>
    </ion-navbar>

</ion-header>


<ion-content>

    <ion-list no-lines>

        <ion-item *ngFor="let location of locations.data">

            <ion-item (click)="viewLocation($event, locations)">{{locations.title}}</ion-item>
            <ion-avatar item-left>
                <ion-icon name="pin"></ion-icon>
            </ion-avatar>
            <!--<img src="./src/pics/mus.png"/>-->
            <h2>{{location.title}}</h2>
            <p>{{location.distance*1.609}} Km</p>
        </ion-item>

    </ion-list>

</ion-content>

data.json

  [
  { "title": "Cat", "longitude": "14,57" },
  { "title": "Bird", "longitude": "17.45" },
  { "title": "Spider", "longitude": "19,12" }
]

Answer 1

如果您想将数据从一个页面传递到另一个页面，您可以

1）通过JSON.stringify（store）和JSON.parse（检索）方法以SQL格式存储JSON数据。

意味着你在数据中进行字符串化，然后在存储到SQL表中并从下一页检索之后，你会使用JSON.parse来获取你的JSON对象。

您可能希望阅读以下有关如何在SQL中存储数据的文章。 SQL Ionic 2

JSON Parse

JSON Stringify

或者其中之一，2）您可以使用navController将数据从一个页面“推送”到另一个页面。一个缺点是如果您的JSON数据很大，您将不得不慢慢地迭代。

一个简单的例子是：

this.navController.push(ThePageNameYouWannaGo, {
      firstPassed: "firstData",
      secondPassed: "secondData",
      thirdPassed: "thirdData",
});


//On the next page (at your constructor),

Constructor(....,NavParams,.....){

  this.first = navParams.get("firstPassed");
  this.second= navParams.get("secondPassed");
  this.third= navParams.get("thirdPassed");

//the value would be stored inside this.first, this.second respectively

对于您的情况，我建议使用方法1，因为我不知道您的JSON文件有多大，并且在您的JSON文件更改时将来的生活更轻松。

导航＆amp;在页面Ionic 2之间传递数据

1 个答案: