[英]Angular Material sidenav directive does not work in app.component
我有一個帶有Material sidenav的應用程序,sidenav顯示帶有鏈接的列表。 這些鏈接之一具有一條指令,如果用戶權限不符合預期,該指令會將其隱藏。 如果我在標頭組件中使用列表,則一切正常,但在我的應用程序組件中,該指令在重新加載應用程序之前不起作用。 我該如何解決?
app.component.ts
import { MatSidenav } from "@angular/material";
import { ViewChild, ViewEncapsulation, OnChanges } from "@angular/core";
import { Component, AfterViewInit, HostBinding, OnInit } from "@angular/core";
import {
Router,
NavigationStart,
NavigationEnd,
NavigationCancel
} from "@angular/router";
import { OverlayContainer } from "@angular/cdk/overlay";
import { CustomizeService } from "./services/shared-services/customize.service";
import { FocusMonitor } from "@angular/cdk/a11y";
import { SidenavService } from "./services/layout-services/sidenav.service";
@Component({
selector: "app-root",
templateUrl: "./app.component.html",
styleUrls: ["./app.component.css"]
})
export class AppComponent implements AfterViewInit, OnInit {
loading;
customTheme;
// theme: string;
@HostBinding("class") componentCssClass;
@ViewChild("sidenav") public sidenav: MatSidenav;
constructor(
private router: Router,
private sidenavService: SidenavService,
private focusMonitor: FocusMonitor,
public overlayContainer: OverlayContainer,
private customizeService: CustomizeService
) {
this.loading = true;
}
ngOnInit() {
this.getTheme();
this.sidenavService.setSidenav(this.sidenav);
}
ngAfterViewInit() {
this.focusMonitor.stopMonitoring(document.getElementById("clienti"));
this.router.events.subscribe(event => {
if (event instanceof NavigationStart) {
this.loading = true;
} else if (
event instanceof NavigationEnd ||
event instanceof NavigationCancel
) {
this.loading = false;
}
});
}
getTheme() {
this.customizeService.getTheme().subscribe(theme => {
this.overlayContainer.getContainerElement().classList.add(theme);
this.componentCssClass = theme || this.getLogoFromLocalStorage();
});
// this.sendTheme(theme);
}
getLogoFromLocalStorage() {
return localStorage.getItem("customStyle");
}
closeSidenav() {
this.sidenavService.close();
}
}
app.component.html
<div color="primary">
<mat-sidenav-container class="example-container" (backdropClick)="closeSidenav()">
<mat-sidenav #sidenav (keydown.escape)="closeSidenav()" disableClose>
<mat-list>
<mat-list-item (click)="closeSidenav()"><button id="clienti" mat-button [routerLink]="['/clienti']"
routerLinkActive="mat-accent">Clienti</button></mat-list-item>
<mat-list-item (click)="closeSidenav()"><button mat-button [routerLink]="['/utenti']" routerLinkActive="mat-accent">Utenti</button></mat-list-item>
<!-- <mat-list-item (click)="closeSidenav()"><butto [routerLink]="['/matricole']" routerLinkActive="mat-accent">Matricole</mat-list-item> -->
<mat-list-item (click)="closeSidenav()"><button mat-button [routerLink]="['/sks']" routerLinkActive="mat-accent">Sks</button></mat-list-item>
<mat-list-item (click)="closeSidenav()" [appCheckPermissions]="9">
<button mat-button [routerLink]="['/packs']" routerLinkActive="mat-accent">Pacchetti</button>
</mat-list-item>
<mat-list-item (click)="closeSidenav()"><button mat-button [routerLink]="['/pc']" routerLinkActive="mat-accent">Pc</button></mat-list-item>
<mat-list-item (click)="closeSidenav()"><button mat-button [routerLink]="['/rinnovi']" routerLinkActive="mat-accent">Rinnovi</button></mat-list-item>
</mat-list>
</mat-sidenav>
<mat-sidenav-content>
<app-header></app-header>
<div class="main" color="primary">
<div [hidden]="!loading" class="loader">
<app-progress-spinner></app-progress-spinner>
</div>
<div [hidden]="loading" class="router-output">
<router-outlet></router-outlet>
</div>
</div>
<app-footer></app-footer>
</mat-sidenav-content>
</mat-sidenav-container>
</div>
入住permission.directive.ts
import { Directive, ElementRef, Renderer2, HostListener, HostBinding, Input, OnInit, TemplateRef, ViewContainerRef } from '@angular/core';
import { DataService } from '../services/shared-services/data.service';
@Directive({
selector: '[appCheckPermissions]'
})
export class CheckPermissionsDirective {
permissions: number[] = [];
constructor(
private data: DataService,
private element: ElementRef,
private renderer: Renderer2
) {
this.getPerms();
}
@Input() set appCheckPermissions(perm: number) {
if (this.permissions.includes(perm)) {
// console.log('ok');
} else {
// console.log('non autorizzato');
this.renderer.setStyle(this.element.nativeElement, 'display', 'none');
}
}
getPerms() {
this.data.getPermissionsFromToken().subscribe(permsArr => {
this.permissions = permsArr;
});
}
}
編輯 : permissions
和_perm
日志
在刷新之前登錄:
刷新后:
編輯2
感謝蘇尼爾·辛格的幫助我發現了問題: permissions
,當我注銷,然后重新登錄,數據不可用app.component
需要的appCheckPermission
指令未重新初始化,所以它需要的舊數據的權限,直到瀏覽器刷新。
解決方法是基於服務的,我不知道如何使用指令進行修復(Sunil Singh方法不起作用)。 所以我寫了一個permissionService
:
permissions = [];
constructor(private data: DataService) {
this.getPerms();
}
getPerms() {
this.data.getPermissionsFromToken().subscribe(permsArr => {
this.permissions = permsArr;
});
}
isPacksManagerEnable() {
return this.permissions.includes(9);
}
單擊菜單按鈕時會觸發getPerms()
方法,然后在app.component
注入服務並在模板上調用isPacksManagerEnable()
:
<mat-list-item (click)="closeSidenav()" *ngIf="permsService.isPacksManagerEnable()">
<button mat-button [routerLink]="['/packs']" routerLinkActive="mat-accent">Pacchetti</button>
</mat-list-item>
希望它對我的問題有幫助
問題
您在指令中存在permissions
和appCheckPermissions
問題。 您正在使用異步數據permissions
檢查權限,該時間在那時不可用。 加載permissions
,您不會觸發設置程序appCheckPermissions
,后者負責隱藏和顯示鏈接。
固定
它具有簡單的修復程序,您需要確保每當permissions
發生變化時,它都應觸發權限檢查。
入住permission.directive.ts
import { Directive, ElementRef, Renderer2, HostListener, HostBinding, Input, OnInit, TemplateRef, ViewContainerRef, AfterViewInit } from '@angular/core';
import { DataService } from '../services/shared-services/data.service';
@Directive({
selector: '[appCheckPermissions]'
})
export class CheckPermissionsDirective implements AfterViewInit {
permissions: number[] = [];
constructor(
private data: DataService,
private element: ElementRef,
private renderer: Renderer2
) {
//this.getPerms();
}
private _perm;
@Input() set appCheckPermissions(perm: number) {
this._perm = perm;
this.doPermissionCheck();
}
doPermissionCheck(){
if (this.permissions.includes(this._perm)) {
this.renderer.setStyle(this.element.nativeElement, 'display', 'block');
// console.log('ok');
} else {
// console.log('non autorizzato');
this.renderer.setStyle(this.element.nativeElement, 'display', 'none');
}
}
ngAfterViewInit() {
this.data.getPermissionsFromToken().subscribe(permsArr => {
this.permissions = permsArr;
this.doPermissionCheck();
});
}
}
注意:代碼是直接在
stackoverflow editor
編寫的,因此可能存在拼寫錯誤或語法錯誤。 請自行修復。
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