手机APP实现三级联动效果

1. 安装 ion-multi-picker

npm install ion-multi-picker@2.1.0--save

import {MultiPickerModule} from'ion-multi-picker';imports: [...MultiPickerModule,...]

3. 创建 provider

终端运行:

ionic g provider city-data

省市区json文件下载地址:
https://raw.githubusercontent.com/raychenfj/ion-multi-picker/master/example/src/assets/chinese-cities.json

将json值赋给下面的 cities  变量即可。

city-data.ts:

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';@Injectable()
export class CityDataProvider {public cities: any[];constructor(public http: HttpClient) {this.cities = 省市区json}
}

4. 创建 page

终端运行:

ionic g page about

about.ts

import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams } from 'ionic-angular';
import {CityDataProvider} from "../../providers/city-data";
@Component({selector: 'page-about',templateUrl: 'about.html'})
export class AboutPage {public session: any;public params: any;public cityColumns: any[];public citydefault: any;constructor(public navCtrl: NavController,public navParams: NavParams,public cityDataProvider: CityDataProvider,) {this.cityColumns = this.cityDataProvider.cities;this.session = window.localStorage.getItem('session');this.citydefault = '17 267 1768';//默认的地区id}
}

about.html

{{citydefault}}<ion-list><ion-item><ion-icon name="pin" item-start></ion-icon><ion-label>居住地</ion-label><ion-multi-picker item-content [multiPickerColumns]="cityColumns" [(ngModel)]="citydefault"  [cancelText]="'取消'" [doneText]="'完成'"></ion-multi-picker></ion-item></ion-list>

展示效果：

默认情况下：

参考：http://metaphors.name/coding/2017/11/26/Ionic11.html