enums - 在 angular2 View 模板中传递枚举

Question

我们可以在 angular2 View 模板中使用枚举吗？

<div class="Dropdown" dropdownType="instrument"></div>

将字符串作为输入传递:

enum DropdownType {
    instrument,
    account,
    currency
}

@Component({
    selector: '[.Dropdown]',
})
export class Dropdown {

    @Input() public set dropdownType(value: any) {

        console.log(value);
    };
}

但是如何传递一个枚举配置呢？我想要在模板中有这样的东西:

<div class="Dropdown" dropdownType="DropdownType.instrument"></div>

最佳做法是什么？

编辑:创建了一个例子:

import {bootstrap} from 'angular2/platform/browser';
import {Component, View, Input} from 'angular2/core';

export enum DropdownType {

    instrument = 0,
    account = 1,
    currency = 2
}

@Component({selector: '[.Dropdown]',})
@View({template: ''})
export class Dropdown {

    public dropdownTypes = DropdownType;

    @Input() public set dropdownType(value: any) {console.log(`-- dropdownType: ${value}`);};
    constructor() {console.log('-- Dropdown ready --');}
}

@Component({ selector: 'header' })
@View({ template: '<div class="Dropdown" dropdownType="dropdownTypes.instrument"> </div>', directives: [Dropdown] })
class Header {}

@Component({ selector: 'my-app' })
@View({ template: '<header></header>', directives: [Header] })
class Tester {}

bootstrap(Tester);

Answer 1

创建一个枚举:

enum ACTIVE_OPTIONS {
  HOME = 0,
  USERS = 1,
  PLAYERS = 2
}

创建一个组件，确保您的枚举列表具有typeof:

export class AppComponent {
  ACTIVE_OPTIONS = ACTIVE_OPTIONS;
  active: ACTIVE_OPTIONS;
}

创建模板:

<li [ngClass]="{ 'active': active === ACTIVE_OPTIONS.HOME }">
  <a routerLink="/in">
    <i class="fa fa-fw fa-dashboard"></i> Home
  </a>
</li>