作为@Eric Lease的装饰器(不幸的是，它不能使用——aot(因此也不能使用——prod)构建)的替代方案，我求助于使用一个公开应用程序所有枚举的服务。只需要公开地将它注入到每个需要它的组件中，在一个简单的名称下，之后你可以在视图中访问枚举。例如:

服务

import { Injectable } from '@angular/core';
import { MyEnumType } from './app.enums';

@Injectable()
export class EnumsService {
  MyEnumType = MyEnumType;
  // ...
}

不要忘记将它包含在模块的提供者列表中。

组件类

export class MyComponent {
  constructor(public enums: EnumsService) {}
  @Input() public someProperty: MyEnumType;

  // ...
}

html组件

<div *ngIf="someProperty === enums.MyEnumType.SomeValue">Match!</div>

您可以创建一个自定义装饰器，添加到组件中，使其能够识别枚举。

myenum.enum.ts:

export enum MyEnum {
    FirstValue,
    SecondValue
}

myenumaware.decorator.ts

import { MyEnum } from './myenum.enum';

export function MyEnumAware(constructor: Function) {
    constructor.prototype.MyEnum = MyEnum;
}

enum-aware.component.ts

import { Component } from '@angular2/core';
import { MyEnum } from './myenum.enum';
import { MyEnumAware } from './myenumaware.decorator';

@Component({
  selector: 'enum-aware',
  template: `
    <div [ngSwitch]="myEnumValue">
      <div *ngSwitchCase="MyEnum.FirstValue">
        First Value
      </div>
      <div *ngSwitchCase="MyEnum.SecondValue">
        Second Value
      </div>
    </div>
    <button (click)="toggleValue()">Toggle Value</button>
  `,
})
@MyEnumAware // <---------------!!!
export default class EnumAwareComponent {
  myEnumValue: MyEnum = MyEnum.FirstValue;

  toggleValue() {
    this.myEnumValue = this.myEnumValue === MyEnum.FirstValue
        ? MyEnum.SecondValue : MyEnum.FirstValue;
  }
}

Angular4 -在HTML模板中使用Enum

解决方案:https://stackoverflow.com/a/42464835/802196

信用：@snorkpete

在你的组件中，你有

enum MyEnum{
  First,
  Second
}

然后在你的组件中，你通过成员'MyEnum'引入Enum类型，并为你的枚举变量'myEnumVar'创建另一个成员:

export class MyComponent{
  MyEnum = MyEnum;
  myEnumVar:MyEnum = MyEnum.Second
  ...
}

你现在可以在你的。html模板中使用myEnumVar和MyEnum。例如，在ngSwitch中使用枚举:

<div [ngSwitch]="myEnumVar">
  <div *ngSwitchCase="MyEnum.First"><app-first-component></app-first-component></div>
  <div *ngSwitchCase="MyEnum.Second"><app-second-component></app-second-component></div>
  <div *ngSwitchDefault>MyEnumVar {{myEnumVar}} is not handled.</div>
</div>

你现在可以这样做:

例如，枚举为:

export enum MessagePriority {
    REGULAR= 1,
    WARNING,
    IMPORTANT,
}

一个状态消息，看起来像这样:

export default class StatusMessage{
    message: string;
    priority: MessagePriority;

    constructor(message: string, priority: MessagePriority){
        this.message = message;
        this.priority = priority;
    }
}

然后在组件的.ts文件中，你可以这样做:

    import StatusMessage from '../../src/entities/building/ranch/administration/statusMessage';
    import { MessagePriority } from '../../enums/message-priority';
            
    export class InfoCardComponent implements OnInit {
     messagePriority: typeof MessagePriority;
                
     constructor() { 
     this.messagePriority = MessagePriority;
    }
                
    @Input() statusMessage: StatusMessage;
    ngOnInit(): void {}
}

最后这个组件的HTML是这样的:

<div class="info-card" [ngSwitch]="statusMessage.priority">
    <h2 *ngSwitchCase="this.messagePriority.REGULAR" class="info-card__regular-message">{{statusMessage.message}}</h2>
    <h2 *ngSwitchCase="this.messagePriority.WARNING" class="info-card__warning-message">{{statusMessage.message}}</h2>
    <h2 *ngSwitchCase="this.messagePriority.IMPORTANT" class="info-card__important-message">{{statusMessage.message}}</h2>
</div>

注意，枚举首先用“typeof messagpriority”类型声明给类，然后用“this”调用定义来绑定到类。messagpriority = messagpriority "

我的组件使用MyClass类型的对象myClassObject，它本身使用MyEnum。这导致了上面描述的相同问题。解决方法是:

export enum MyEnum {
    Option1,
    Option2,
    Option3
}
export class MyClass {
    myEnum: typeof MyEnum;
    myEnumField: MyEnum;
    someOtherField: string;
}

然后在模板中使用这个

<div [ngSwitch]="myClassObject.myEnumField">
  <div *ngSwitchCase="myClassObject.myEnum.Option1">
    Do something for Option1
  </div>
  <div *ngSwitchCase="myClassObject.myEnum.Option2">
    Do something for Option2
  </div>
  <div *ngSwitchCase="myClassObject.myEnum.Option3">
    Do something for Opiton3
  </div>
</div>

从rc开始。6 / final

...

export enum AdnetNetworkPropSelector {
    CONTENT,
    PACKAGE,
    RESOURCE
}

<div style="height: 100%">
          <div [ngSwitch]="propSelector">
                 <div *ngSwitchCase="adnetNetworkPropSelector.CONTENT">
                      <AdnetNetworkPackageContentProps [setAdnetContentModels]="adnetNetworkPackageContent.selectedAdnetContentModel">
                                    </AdnetNetworkPackageContentProps>
                  </div>
                 <div *ngSwitchCase="adnetNetworkPropSelector.PACKAGE">
                </div>
            </div>              
        </div>


export class AdnetNetwork {       
    private adnetNetworkPropSelector = AdnetNetworkPropSelector;
    private propSelector = AdnetNetworkPropSelector.CONTENT;
}