[英]How to save sidenav (mat-drawer) state to localstorage in Angular Material?
我對 Angular Material 中的 mat-drawer 有問題。 我想將我的狀態保存到 localstorage 但 mat-drawer 總是打開的。
Sidenav 在沒有文本的情況下保持墊子圖標時具有擴展部分和關閉擴展部分。 當您單擊底部按鈕隱藏時,sidenav 關閉,但刷新頁面后 Sidenav 再次展開(但在 localstorage 中關閉)。
看起來像這樣:
你知道怎么解決這個問題嗎? 謝謝!
源代碼:
應用程序組件.html
<mat-drawer-container class="content-container" autosize >
<mat-drawer
mode="side"
class="sidenav"
disableClose="true"
opened="true">
<div class="sidenav-container">
<mat-nav-list>
<a class="nav-item nav-link" mat-list-item routerLink="/private/dashboard" routerLinkActive="active" [routerLinkActiveOptions]="{ exact: true }">
<mat-icon style="padding-right:5px;" matTooltipPosition="right" [matTooltipDisabled]="disabledTooltip">dashboard</mat-icon>
<span *ngIf="isExpanded">Dashboard</span>
</a>
<a class="nav-item nav-link" mat-list-item routerLink="/private/companies" routerLinkActive="active">
<mat-icon style="padding-right:5px;">stars</mat-icon>
<span *ngIf="isExpanded">Subjects</span>
</a>
<a class="nav-item nav-link" mat-list-item routerLink="/private/users" routerLinkActive="active">
<mat-icon style="padding-right:5px;">group</mat-icon>
<span *ngIf="isExpanded">Users</span>
</a>
<a class="nav-item nav-link" mat-list-item routerLink="/private/api-customers" routerLinkActive="active">
<mat-icon style="padding-right:5px;">beenhere</mat-icon>
<span *ngIf="isExpanded">Clients</span>
</a>
<a class="nav-item nav-link" mat-list-item routerLink="/private/applications" routerLinkActive="active">
<mat-icon style="padding-right:5px;">apps</mat-icon>
<span *ngIf="isExpanded">Apps</span>
</a>
<a class="nav-item nav-link" mat-list-item routerLink="/private/calendar" routerLinkActive="active">
<mat-icon style="padding-right:5px;">calendar_today</mat-icon>
<span *ngIf="isExpanded">Calendar</span>
</a>
</mat-nav-list>
<div class="sidenav-bottom">
<mat-nav-list>
<a class="nav-item nav-link" mat-list-item (click)="onSidenavToggle()">
<mat-icon *ngIf="isExpanded">arrow_back_ios</mat-icon>
<mat-icon *ngIf="!isExpanded">arrow_forward_ios</mat-icon>
<span *ngIf="isExpanded">Hide</span>
</a>
</mat-nav-list>
</div>
</mat-drawer>
<mat-drawer-content>
Page content
</mat-drawer-content>
</mat-drawer-container>
app.component.ts
import {Component, HostListener, Inject, OnInit} from '@angular/core';
import { Router } from '@angular/router';
import {Subject} from 'rxjs';
@Component({
selector: 'app',
templateUrl: './app.component.html',
styleUrls: ['./app.component.scss'],
})
export class AppComponent {
isExpanded = true;
constructor(
private sidenavService: SidebarService) {
this.sidenavService.setHideSidebar(this.sidenavService.isHideSidebar());
}
onSidenavToggle() {
this.isExpanded = !this.isExpanded;
this.sidenavService.setHideSidebar(!this.sidenavService.isHideSidebar());
this.sidenavService.sideBarState$.next(this.isExpanded);
}}
sidebar.service.ts
import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';
@Injectable()
export class SidebarService {
public sideBarState$: Subject<boolean> = new Subject<boolean>();
constructor() {
const initialValue = localStorage.getItem('isExpanded');
this.sideBarState$.next(initialValue === 'close');
}
getHideSidebar(): Subject<boolean> {
return this.sideBarState$;
}
setHideSidebar(newValue: boolean): void {
localStorage.setItem('isExpanded', newValue ? 'close' : 'open');
this.sideBarState$.next(newValue);
}
isHideSidebar(): boolean {
return localStorage.getItem('isExpanded') === 'close';
}
}
原來問題出在組件中的isExpanded
上。 該值被硬編碼為true
,與服務(或存儲在 LOCALSTORAGE 中的值)無關。
其他一些建議是單獨使用Subject
值作為isExpanded
應該是什么的一個真正來源(使用 EMIT 值,不要自己設置)。 如果您將isExpanded
存儲為 true 或 false 而不是open
或close
,它也會更有意義。 變量名稱建議該值為真或假。
import {Component, HostListener, Inject, OnInit} from '@angular/core';
import { Router } from '@angular/router';
import {Subject} from 'rxjs';
@Component({
selector: 'app',
templateUrl: './app.component.html',
styleUrls: ['./app.component.scss'],
})
export class AppComponent {
isExpanded;
constructor(
private sidenavService: SidebarService) {
isExpanded = !this.sidenavService.isHideSidebar();
}
onSidenavToggle() {
this.isExpanded = !this.isExpanded;
this.sidenavService.setHideSidebar(!this.sidenavService.isHideSidebar());
this.sidenavService.sideBarState$.next(this.isExpanded);
}}
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