ionic3 多级联动城市选择插件 ion-multi-picker

1、效果演示

2、npm安装扩展包依赖  ion-multi-picker 组件

npm install ion-multi-picker --save

3、在app.module.ts中导入插件模块

 1 import { MultiPickerModule } from 'ion-multi-picker';
 2 @NgModule({
 3   declarations: [
 4     .....
 5   ],
 6   imports: [
 7     IonicModule.forRoot(MyApp),
 8     //Import MultiPickerModule 模块
 9     MultiPickerModule 
10   ],
11   bootstrap: [IonicApp],
12   entryComponents: [
13     .....
14   ],
15   providers: []
16 })
17 export class AppModule {}    

4、具体实例使用如下：

（1）获取本地省市区json数据

　　

 1 //定义省市区数据源变量
 2  public cityList = {
 3    area:[]
 4 }; 
 5 //userInfo即为最终选中的省市区数据
 6 public userInfo = {
 7      province:"",
 8     city:"",
 9     district:""
10 };
11 // 获取本地城市列表服务
12 getCityData() {
13     return Observable.create(observer => {
14         this.http.get("./assets/area-data.json").subscribe(res => {
15             this.cityList['area'] = res;
16         }, err => {
17              this.handleError(err);
18         })
19     });
20 }
21 //获取选定的省市区
22 public getCityArea(){
23     let cityArr = document.getElementById("cities").innerText;
24     cityArr = this.Validate.trimBlank(cityArr);
25     if(cityArr == '省-市-区(县)'){
26      this.Pop.toast("请选择所在地区");
27      return false;
28     }
29     this.cityArr = cityArr.split("-");
30     this.userInfo.province  = this.cityArr[0];
31     this.userInfo.city  = this.cityArr[1];
32     this.userInfo.district  = this.cityArr[2];
33     return this.userInfo;
34 }

5、模板渲染

1 <ion-item>
2     <ion-label>城市</ion-label>
3     <ion-multi-picker id="cities" item-content [cancelText]="'取消'" [doneText]="'完成'" [placeholder]="userInfo.province == undefined ? '省-市-区(县)' : (userInfo.province + '-'+ userInfo.city +'-'+ userInfo.district)" [separator]="'-'" [multiPickerColumns]="cityList['area']"></ion-multi-picker>
4 </ion-item>

注意：其中 

　　　[multiPickerColumns]属性用于渲染获取到的本地省市区数据源

　　[placeholder]属性用于初始化（已选中或未选中的）当前地区

　　[cancelText]属性为取消按钮

　　[cancelText]属性为完成按钮

来源：https://www.cnblogs.com/hsl-shiliang/p/8709206.html