ngFor inside ngFor - Angular 2

时间:2017-02-11 21:46:22

标签: javascript arrays angular typescript

如何在Angular 2中使用*ngFor迭代多维数组。 以下是我使用的DOM Wrapper:

<li *ngFor="let menuName of menuNames" routerLinkActive="active" [ngClass]="{'has-submenu':menuName.submenu?.length>0 }">
    <a href="#" [routerLink]="menuName.route" *ngIf="!menuName.enableSM"> <i class="glyphicon {{menuName.icon}}"></i><span class="nav-label">{{menuName.name}}</span> </a>
    <a href="#" *ngIf="menuName.enableSM"> <i class="glyphicon glyphicon-list-alt"></i> <span class="nav-label">Pages</span> </a>
    <ul class="list-unstyled" *ngIf="menuName.enableSM">
        <li *ngFor="let subMenuName of menuNames['submenu'] let idx = index;"> <a [routerLink]="subMenuName.route">404</a> </li>
    </ul>
</li>

嵌套数组:

menuNames = [{
    name: "Dashboard",
    route: '/home',
    icon: "glyphicon-th-large",
    submenu: [],
    enableSM: false
}, {
    name: "Pages",
    route: '',
    icon: "glyphicon-list-alt",
    submenu: [{
        name: "404",
        route: '/404.html'
    }, {
        name: "Signin",
        route: '/auth/signin'
    }],
    enableSM: true
}];

第二个循环根本不渲染。

1 个答案:

答案 0 :(得分:5)

您的代码中存在一些小问题,错别字。第二个*ngFor应如下所示:

*ngFor="let subMenuName of menuName['submenu']; let idx = index;"

请注意menuName而非menuNames并且在let idx之前有分号。