问题描述
在阅读了我能找到的所有内容并且失败后，我必须在这里问:
After reading everything I could find, and failing, I must ask here:
我正在尝试使用 ionic2 的存储，就像文档告诉我的那样，
I am trying to use ionic2's Storage, just like the doc tells me to,
文档:https://ionicframework.com/docs/storage/
这是我的代码:
应用模块.ts
import { BrowserModule } from '@angular/platform-browser';
import { ErrorHandler, NgModule } from '@angular/core';
import { IonicApp, IonicErrorHandler, IonicModule } from 'ionic-angular';
import { SplashScreen } from '@ionic-native/splash-screen';
import { StatusBar } from '@ionic-native/status-bar';
import { MyApp } from './app.component';
import { HomePage } from '../pages/home/home';
import { Intro } from '../pages/intro/intro';
import { Checklist } from '../pages/checklist/checklist';
// import { Http } from '@angular/http';
import {IonicStorageModule} from '@ionic/Storage';
import { Data } from '../providers/data';
import {HttpModule} from '@angular/http';
// import {Storage} from '@ionic/storage';
@NgModule({
declarations: [
MyApp,
HomePage,
Intro,
Checklist
],
imports: [
HttpModule,
BrowserModule,
IonicModule.forRoot(MyApp),
IonicStorageModule.forRoot()
],
bootstrap: [IonicApp],
entryComponents: [
MyApp,
HomePage,
Intro,
Checklist
],
providers: [
StatusBar,
SplashScreen,
{provide: ErrorHandler, useClass: IonicErrorHandler},
// Storage,
//Http,
Data
],
})
export class AppModule {}
data.ts
import { Injectable } from '@angular/core';
// import { Http } from '@angular/http';
import 'rxjs/add/operator/map';
// import { HttpModule } from '@angular/http';
import { Storage } from '@ionic/storage';
@Injectable()
export class Data {
constructor(public storage: Storage) {
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
getData(): Promise<any> {
return this.storage.get('checklists');
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
save(data): void {
let saveData = [];
//Remove observables
data.forEach((checklist) => {
saveData.push({
title: checklist.title,
items: checklist.items
});
});
let newData = JSON.stringify(saveData);
this.storage.set('checklists', newData);
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}
home.ts
// import { Component } from '@angular/core';
// import { NavController } from 'ionic-angular';
// @Component({
// selector: 'page-home',
// templateUrl: 'home.html'
// })
// export class HomePage {
// constructor(public navCtrl: NavController) {
// }
// }
import { Component } from '@angular/core';
import { NavController, AlertController, Platform } from 'ionic-angular';
import { Checklist } from '../checklist/checklist';
import { ChecklistModel } from '../../models/checklist-model';
import { Data } from '../../providers/data';
import { Keyboard } from 'ionic-native';
@Component({
selector: 'page-home',
templateUrl: 'home.html',
})
export class HomePage {
checklists: ChecklistModel[] = [];
constructor(public navCtrl: NavController, public dataService: Data,
public alertCtrl: AlertController, public platform: Platform) {
}
// constructor(public navCtrl: NavController, public alertCtrl: AlertController, public platform: Platform) {
// // this.checklists.push(new ChecklistModel("Noam", [1,2,3]));
// }
///////////////////////////////////////////////////////////////////////////////////////////////////////////
ionViewDidLoad() {
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////
addChecklist(): void {
let prompt = this.alertCtrl.create({
title: 'New Checklist',
message: 'Enter the name of your new checklist below:',
inputs: [
{
name: 'name'
}
],
buttons: [
{
text: 'Cancel'
},
{
text: 'Save',
handler: data => {
let newChecklist = new ChecklistModel(data.name, []);
this.checklists.push(newChecklist);
newChecklist.checklistUpdates().subscribe(update => {
this.save();
});
this.save();
}
}
]
});
prompt.present();
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////
renameChecklist(checklist): void {
let prompt = this.alertCtrl.create({
title: 'Rename Checklist',
message: 'Enter the new name of this checklist below:',
inputs: [
{
name: 'name'
}
],
buttons: [
{
text: 'Cancel'
},
{
text: 'Save',
handler: data => {
let index = this.checklists.indexOf(checklist);
if (index > -1) {
this.checklists[index].setTitle(data.name);
this.save();
}
}
}
]
});
prompt.present();
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////
viewChecklist(checklist): void {
this.navCtrl.push(Checklist, {
checklist: checklist
});
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////
removeChecklist(checklist): void {
let index = this.checklists.indexOf(checklist);
if (index > -1) {
this.checklists.splice(index, 1);
this.save();
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////
save(): void {
Keyboard.close();
this.dataService.save(this.checklists);
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////
}
应该被调用和使用存储的方法是主页的save().
The method that is supposed to get called and use the Storage is HomePage's save().
但是，我无法做到这一点，因为在页面加载之前，我就得到了
I can't get that far, however, because before the page even loads, I get
未捕获运行时错误(承诺):错误:没有存储提供程序！g (http://localhost:8100/build/polyfills.js:3:7133 错误) 在injectionError (http://localhost:8100/build/main.js:1585:86) 在noProviderError (http://localhost:8100/build/main.js:1623:12) 在ReflectiveInjector_.throwOrNull(http://localhost:8100/build/main.js:3125:19) 在ReflectiveInjector.getByKeyDefault(http://localhost:8100/build/main.js:3164:25) 在ReflectiveInjector.getByKey(http://localhost:8100/build/main.js:3096:25) 在ReflectiveInjector.get (http://localhost:8100/build/main.js:2965:21)在 AppModuleInjector.get (ng:///AppModule/module.ngfactory.js:254:82)在 AppModuleInjector.getInternal(ng:///AppModule/module.ngfactory.js:481:44) 在AppModuleInjector.NgModuleInjector.get(http://localhost:8100/build/main.js:3929:44) 在 resolveDep(http://localhost:8100/build/main.js:11334:45) 在创建类(http://localhost:8100/build/main.js:11202:32) 在createDirectiveInstance (http://localhost:8100/build/main.js:11028:37)在 createViewNodes (http://localhost:8100/build/main.js:12377:49) 在createRootView (http://localhost:8100/build/main.js:12282:5)
Runtime Error Uncaught (in promise): Error: No provider for Storage! Error at g (http://localhost:8100/build/polyfills.js:3:7133) at injectionError (http://localhost:8100/build/main.js:1585:86) at noProviderError (http://localhost:8100/build/main.js:1623:12) at ReflectiveInjector_.throwOrNull (http://localhost:8100/build/main.js:3125:19) at ReflectiveInjector.getByKeyDefault (http://localhost:8100/build/main.js:3164:25) at ReflectiveInjector.getByKey (http://localhost:8100/build/main.js:3096:25) at ReflectiveInjector.get (http://localhost:8100/build/main.js:2965:21) at AppModuleInjector.get (ng:///AppModule/module.ngfactory.js:254:82) at AppModuleInjector.getInternal (ng:///AppModule/module.ngfactory.js:481:44) at AppModuleInjector.NgModuleInjector.get (http://localhost:8100/build/main.js:3929:44) at resolveDep (http://localhost:8100/build/main.js:11334:45) at createClass (http://localhost:8100/build/main.js:11202:32) at createDirectiveInstance (http://localhost:8100/build/main.js:11028:37) at createViewNodes (http://localhost:8100/build/main.js:12377:49) at createRootView (http://localhost:8100/build/main.js:12282:5)
包.json:
{
"name": "ionic-hello-world",
"author": "Ionic Framework",
"homepage": "http://ionicframework.com/",
"private": true,
"config": {
"ionic_source_map": "source-map"
},
"scripts": {
"clean": "ionic-app-scripts clean",
"build": "ionic-app-scripts build",
"ionic:build": "ionic-app-scripts build",
"ionic:serve": "ionic-app-scripts serve"
},
"dependencies": {
"@angular/common": "4.0.0",
"@angular/compiler": "4.0.0",
"@angular/compiler-cli": "4.0.0",
"@angular/core": "4.0.0",
"@angular/forms": "4.0.0",
"@angular/http": "4.0.0",
"@angular/platform-browser": "4.0.0",
"@angular/platform-browser-dynamic": "4.0.0",
"@ionic-native/core": "3.4.2",
"@ionic-native/splash-screen": "3.4.2",
"@ionic-native/status-bar": "3.4.2",
"@ionic/storage": "^2.0.1",
"ionic-angular": "3.0.1",
"ionic-native": "^2.9.0",
"ionicons": "3.0.0",
"rxjs": "5.1.1",
"sw-toolbox": "3.4.0",
"zone.js": "^0.8.4"
},
"devDependencies": {
"@ionic/app-scripts": "1.3.0",
"typescript": "~2.2.1",
"webpack": "^2.4.1"
},
"cordovaPlugins": [
"cordova-plugin-whitelist",
"cordova-plugin-console",
"cordova-plugin-statusbar",
"cordova-plugin-device",
"cordova-plugin-splashscreen",
"ionic-plugin-keyboard"
],
"cordovaPlatforms": [],
"description": "quicklists: An Ionic project"
}
既然我做了文档所说的一切，请赐教 - 仍然缺少什么会导致找不到存储
Since I did everything the doc said, please enlighten me - What is still missing that would cause the Storage not to be found
谢谢
推荐答案
首先需要安装:npm install --save @ionic/storage
问题出在 app.ts 中:
The problem was in app.ts:
import {IonicStorageModule} from '@ionic/Storage';
大写S"而不是非大写s":
Capital 'S' instead of non capital 's':
from '@ionic/Storage'
代替:
from '@ionic/storage'
不知道为什么编译器不会发现问题，但它没有.
No idea why the compiler wouldn't catch that if it's a problem, but it didn't.
感谢@chairmanmow
Thanks to @chairmanmow
编辑
这个答案曾经得到很多支持，但后来停止了.
This answer used to get a lot of upvotes, and that stopped.
我只能假设这是由于版本更新/错误修复.
I can only assume this is due to version updates/bug fixes.
我建议您在继续使用此解决方案之前更新您的角度.
I suggest you update your angular before going forward with this solution.
这篇关于Ionic2 错误:“没有存储提供程序"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！