Ionic3学习笔记（十一）实现省市区三级联动

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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 ion-multi-picker@2.1.0 --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

<ion-header>  <ion-navbar>    <ion-title>编辑</ion-title>    <ion-buttons end>      <button ion-button>保存</button>    </ion-buttons>  </ion-navbar></ion-header><ion-content>  <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" [cancelText]="'取消'" [doneText]="'完成'"></ion-multi-picker>    </ion-item>  </ion-list></ion-content>

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:

Android:

如有不当之处，请予指正，谢谢～