使用angular 4根据查询参数显示菜单项

Question

我正在基于角色的菜单上显示基于查询字符串的菜单项。 就像当网址的格式为http://www.something.com/something?type=admin时，我只需要显示Admins的菜单项。 但是我的逻辑是隐藏所有菜单项。 为此，我已经实现了我的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，然后按预期工作。 但是发生的是，当我尝试基于* ngIf =“ type = admin”显示和隐藏菜单项时，所有菜单项都被隐藏了。 请参阅下面的模板代码。

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>

谁能帮我所有菜单项都隐藏的原因。

Answer 1

我想你应该换行

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

至

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

这将与名为“ type”的变量（而不是硬编码的字符串'type' ，并且还会删除*ngIf末尾不必要的分号，因为在那里不需要。