Angular2 @LocalStorage

This little Angular2/typescript decorator makes it super easy to save and restore automatically a variable state in your directive (class property) using HTML5' LocalStorage.

Use

1. Download the library using npm or github: npm install --save angular2-localstorage

2. Import the WebStorageModule in your app module:

   import {Component} from "angular2/core";
   import {WebStorageModule, LocalStorageService} from "angular2-localstorage";
   
   @NgModule({
       import: [WebStorageModule]
       providers: [LocalStorageService]
   })
   export class AppModule {}

3. Use the LocalStorage decorator

import { LocalStorage, SessionStorage } from "angular2-localstorage";

class MySuperComponent {
    @LocalStorage() public lastSearchQuery:Object = {};
    @LocalStorage('differentLocalStorageKey') public lastSearchQuery:Object = {};
}

Note: Define always a default value at the property you are using @LocalStorage.

Note: The localstorage key is per default the property name. Define the first argument of @LocalStorage to set different one.

Note: Please don't store circular structures as this library uses JSON.stringify to encode before using LocalStorage.

Examples

@Component({
    selector: 'app-login',
    template: `
        <form>
            <div>
                <input type="text" [(ngModel)]="username" placeholder="Username" />
                <input type="password" [(ngModel)]="password" placeholder="Password" />
            </div>

            <input type="checkbox" [(ngModel)]="rememberMe" /> Keep me logged in

            <button type="submit">Login</button>
        </form>
    `
})
class AppLoginComponent {
    //here happens the magic. `username` is always restored from the localstorage when you reload the site
    @LocalStorage() public username:string = '';

    public password:string;

    //here happens the magic. `rememberMe` is always restored from the localstorage when you reload the site
    @LocalStorage() public rememberMe:boolean = false;
}

@Component({
    selector: 'admin-menu',
    template: `
        <div *ngFor="#menuItem of menuItems() | mapToIterable; #i = index">
            <h2 (click)="hiddenMenuItems[i] = !!!hiddenMenuItems[i]">
                {{i}}: {{category.label}}
            </h2>
            <div style="padding-left: 15px;" [hidden]="hiddenMenuItems[i]">
                <a href>Some sub menu item 1</a>
                <a href>Some sub menu item 2</a>
                <a href>Some sub menu item 3</a>
            </div>
        </div>
    `
})

class AdminMenuComponent {
    public menuItems = [{title: 'Menu1'}, {title: 'Menu2'}, {title: 'Menu3'}];

    //here happens the magic. `hiddenMenuItems` is always restored from the localstorage when you reload the site
    @LocalStorage() public hiddenMenuItems:Array<boolean> = [];

    //here happens the magic. `profile` is always restored from the sessionStorage when you reload the site from the current tab/browser. This is perfect for more sensitive information that shouldn't stay once the user closes the browser.
    @SessionStorage() public profile:any = {};
}