Ionic3学习笔记（十一）实现省市区三级联动

本文为原创文章，转载请标明出处

目录

1. 安装 ion-multi-picker
2. 导入 app.module.ts
3. 创建 provider
4. �创建 page
5. 一个坑
6. 更多
7. 效果图

1. 安装 ion-multi-picker

终端运行:

npm install [email protected] --save

2. 导入 app.module.ts

...
import {MultiPickerModule} from 'ion-multi-picker';
...

@NgModule({
  ...
  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 {Injectable} from '@angular/core';


@Injectable()
export class CityDataProvider {

  cities: any[];

  constructor() {
    this.cities = 上面的json（太长我就不复制粘贴了）
  }

}

4. �创建 page

终端运行:

ionic g page edit

edit.html

  
    编辑

    
      保存
    
  





  
    
      
      居住地
      
    
  

edit.ts

import {Component} from '@angular/core';
import {IonicPage, NavController, NavParams} from 'ionic-angular';

import {CityDataProvider} from "../../providers/city-data/city-data";


@IonicPage()
@Component({
  selector: 'page-edit',
  templateUrl: 'edit.html',
})
export class EditPage {

  cityColumns: any[];

  constructor(public navCtrl: NavController, public navParams: NavParams, public cityDataProvider: CityDataProvider) {
    this.cityColumns = this.cityDataProvider.cities;
  }

}

5. 一个坑

错误如下:

Uncaught (in promise): Error: Template parse errors:
Can't bind to 'multiPickerColumns' since it isn't a known property of 'ion-multi-picker'.
1. If 'ion-multi-picker' is an Angular component and it has 'multiPickerColumns' input, then verify that it is part of this module.
2. If 'ion-multi-picker' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component.

为啥就报错了咩...明明什么都没有错...

最终我在这个 Issue 中找到了解决方案。

因为我的这个页面是子页面，所以也要将 MultiPickerModule 导入子module一下。如果是根页面的话就没有问题。

edit.module.ts:

import { NgModule } from '@angular/core';
import { IonicPageModule } from 'ionic-angular';
import { EditPage } from './edit';

import {MultiPickerModule} from 'ion-multi-picker';

@NgModule({
  declarations: [
    EditPage,
  ],
  imports: [
    MultiPickerModule,
    IonicPageModule.forChild(EditPage),
  ],
})
export class EditPageModule {}

6. 更多

GitHub - ion-multi-picker

7. 效果图

iOS:

iOS

Android:

Android

如有不当之处，请予指正，谢谢～