使用 angular 4 根据查询参数显示菜单项

Question

我正在研究基于角色的菜单，以根据查询字符串显示菜单项。就像 url 的形式是 http://www.something.com/something?type=admin 那么我必须只显示管理员的菜单项。但我的逻辑是隐藏所有菜单项。为此，我已经实现了 header.component.ts

中的逻辑

ngOnInit() {
    this.route.queryParams
    .filter(params => params.type)
    .subscribe(params => {
        console.log(params); //{type: "admin"}
        this.type = params.type;
        console.log(this.type);

        if(this.type == "admin"){
            console.log("ADMIN PAGE");                
                //this.router.navigate(['dashboard'], { queryParams: { type: this.type } });
                //this.router.navigate(['dashboard']);
        }else if(this.type == "national"){
            console.log("NATIONAL PAGE");
        }else if(this.type == "warrington"){
            console.log("WARRINGTON PAGE");
        }else if(this.type == "subcontractorAdmin"){
            console.log("SUB CONTRACOTR ADMIN PAGE");
        }else if(this.type == "subcontractorManager"){
            console.log("SUB CONTRACTOR MANAGER PAGE");
        }else{
            console.log("OTHERS PAGE");
        }
    });
  }

当我使用逻辑时，它按预期工作正常。但是当我尝试显示和隐藏基于 *ngIf="type=admin" 的菜单项时，会发生什么情况，然后所有菜单项都被隐藏了。请参阅下面我的模板代码。

header.component.html

<ul class="nav navbar-nav">
              <li routerLinkActive="active" *ngIf="'type' == 'admin';">
                <a href="javascript:void(0);" (click)="navigateExternal('http://www.something.com/dashboard','_self')">Dashboard</a>
              </li>
              <li routerLinkActive="active" *ngIf="'type' == 'admin';">
                  <a href="javascript:void(0);" (click)="navigateExternal('http://www.something.com/supplier-list','_self')">Suppliers</a>
              </li>
              <li routerLinkActive="active" *ngIf="'type' == 'admin';">
                  <a href="javascript:void(0);" (click)="navigateExternal('http://www.something.com/compliance-supplier-list','_self')">Compliance</a>
              </li>
              <li routerLinkActive="active" *ngIf="'type' == 'admin';">
                  <a href="javascript:void(0);" (click)="navigateExternal('http://www.something.com/admin-invoice-list','_self')">Invoicing</a>
              </li>
              <li routerLinkActive="active" *ngIf="'type' == 'admin';">
                  <a href="javascript:void(0);" (click)="navigateExternal('http://www.something.com/internal-user-list','_self')">User Management</a>

              </li>
              <li routerLinkActive="active" *ngIf="'type' == 'admin';">
                  <a href="javascript:void(0);" (click)="navigateExternal('http://www.something.com/node/add/upload_weight_csv','_self')">Weight Ticket</a>

              </li>
              <li routerLinkActive="active" *ngIf="'type' == 'admin';">
                <a routerLink="/searchsupplier">Search</a>
              </li>
            </ul>

谁能帮我解释为什么所有的菜单项都被隐藏了。

Answer 1

我认为你应该换行

 <li routerLinkActive="active" *ngIf="'type' == 'admin';">

到

 <li routerLinkActive="active" *ngIf="type == 'admin'">

这与名为 'type' 的变量而不是硬编码字符串 'type' 进行比较，并且还删除了 *ngIf 末尾不必要的分号，因为那里不需要分号。

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