如何将数据数组对象保存到离子 SQlite 存储(TypeScript、Angular 5、Ionic 3) [英] How to save a data array object to ionic SQlite storage (TypeScript, Angular 5, Ionic 3)

问题描述

我正在尝试使用 Ionic SQlite 存储将具有许多属性的数据数组对象保存到收藏夹列表中.

例如，我在数据提供者中有一个数据数组:

data.ts

 私有选项:any[] = [{"name": "选项 01","网站": "www.google.com","about": "选择这个选项 01",id":1"},{"name": "选项 02","网站": "www.yahoo.com","about": "选择这个选项 02",id":2"},{"name": "选项 03","网站": "www.bing.com","about": "选择这个选项 03",id":3"},{"name": "选项 04","网站": "www.stackoverflow.com","about": "选择这个选项 04",id":4"}]

并且我在我的主页 html 页面中调用这些数据对象，该页面具有保存到收藏夹列表的选项.

<h1>{{option.name}}</h1><h1>{{option.about }}</h1><h4>{{option.website}}</h4><button ion-button block (click)="saveToFavorite()">保存到收藏夹列表</button><button ion-button block (click)="removeFromFavorite()">从收藏列表中删除</button></ion-card>

这里是不完整的home.ts文件

import { Storage } from '@ionic/storage';const STORAGE_KEY = 'favoriteOptions';saveToFavorite(选项){this.storage.set();}removeFromFavorite(选项){this.storage.remove();}

我希望 saveToFavorite() 将选项数据数组对象保存到收藏夹选项存储键，以便我可以将它们全部加载到 favoriteList HTML 页面:

<div *ngFor="让选项的选项"><h1>{{option.name}}</h1><p>{{option.about}}</p><button ion-button block (click)="removeFromFavorite()">从收藏列表中删除</button>

</离子含量>

favoriteList ts 文件:

 getAllFavoriteOptions() {返回 this.storage.get(STORAGE_KEY);}removeFromFavorite(选项){this.storage.remove();}

不知怎的，我有点迷失了.请更正我在 ts 文件上的代码.

提前致谢！

解决方案

制作收藏夹功能:

addFavorite(favorite:any):void{让收藏夹 = this.storage.get('收藏夹');如果(收藏夹){收藏夹.推(最喜欢的)；this.storage.set('收藏夹', 收藏夹);}别的{收藏夹 = [];收藏夹.推(最喜欢的)；this.storage.set('收藏夹',收藏夹);}

然后要获得收藏夹添加此功能:

getFavorites():any{让收藏夹 = this.storage.get("收藏夹");返回收藏夹；}

对于离子:如果您使用 @ionic/storage 然后加载项目使用 异步管道:

getFavorites():Promise{让收藏夹 = this.storage.get("收藏夹");返回收藏夹；}

然后在 *ngFor 中访问它们:

<div>{{item.name}}</div>

I'm trying to save a data array object with many attributes to a favorite list using Ionic SQlite storage.

For instance, I have a data array in data provider:

data.ts

     private options: any[] = [

        {
          "name": "option 01",
          "website": "www.google.com",
          "about": "choose this option 01",
          "id": "1"
        },

        {
          "name": "option 02",
          "website": "www.yahoo.com",
          "about": "choose this option 02",
          "id": "2"
        },
        {
          "name": "option 03",
          "website": "www.bing.com",
          "about": "choose this option 03",
          "id": "3"
        },
        {
          "name": "option 04",
          "website": "www.stackoverflow.com",
          "about": "choose this option 04",
          "id": "4"
        }
    ]

and I'm calling these data objects in my home html page which has an option to save to favorite list.

<ion-card *ngFor="let option of options">
  <h1>{{option.name}}</h1>
  <h1>{{option.about }}</h1>
<h4>{{option.website}}</h4>

<button ion-button block (click)="saveToFavorite()">Save to Favorite List</button>

<button ion-button block (click)="removeFromFavorite()">Remove from Favorite List</button>
</ion-card>

and here's incomplete home.ts file

import { Storage } from '@ionic/storage';

const STORAGE_KEY = 'favoriteOptions';

  saveToFavorite(option) {

    this.storage.set();
  }

  removeFromFavorite(option) {
   this.storage.remove();
  }

I want saveToFavorite() will save option data array object to a favorite options storage key so I can load them all up on a favoriteList HTML page:

<ion-content>
    <div *ngFor="let option of options">
        <h1>{{option.name}}</h1>
        <p>{{option.about}}</p>
        <button ion-button block (click)="removeFromFavorite()">Remove from Favorite List</button>
    </div>
</ion-content>

favoriteList ts file:

  getAllFavoriteOptions() {
    return this.storage.get(STORAGE_KEY);
  }

  removeFromFavorite(option) {
   this.storage.remove();
  }

Somehow I'm kinda lost. Please correct my codes on ts files.

Thanks in advance!

解决方案

make a function to save the favorites:

addFavorite(favorite:any):void{
  let favorites = this.storage.get('favorites');
  if(favorites){
    favorites.push(favorite);
    this.storage.set('favorites', favorites);
  }else{
    favorites = [];
    favorites.push(favorite);
    this.storage.set('favorites',favorites);
  }

then to get favorites add this function:

getFavorites():any{
  let favorites = this.storage.get("favorites");
  return favorites;
}

for ionic: if you are using @ionic/storage then to load items use async pipe:

getFavorites():Promise<any>{
  let favorites = this.storage.get("favorites");
  return favorites;
}

then to access them in *ngFor do this:

<div *ngFor="let item of getFavorites() | async">
      <div>{{item.name}}</div>
</div>

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