Ionic3学习笔记（十一）实现省市区三级联动

Theo Tsao

发布于 2018-09-07 16:14:42

1.8K0

发布于 2018-09-07 16:14:42

文章被收录于专栏：Theo TsaoTheo Tsao

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 {}