选择基于枚举在Angular2

问题描述

我有这样的枚举（我使用的打字稿的）：

I have this enum (I'm using TypeScript) :

export enum CountryCodeEnum {
    France = 1,
    Belgium = 2
}

我想建立一个的选择的在我的格式的，对每个选项的枚举整数值值，枚举文本作为标签，像这样的：

I would like to build a select in my form, with for each option the enum integer value as value, and the enum text as label, like this :

<select>
     <option value="1">France</option>
     <option value="2">Belgium</option>
</select>

我怎样才能做到这一点？

How can I do this ?

推荐答案

从的

Using the keys pipe from http://stackoverflow.com/a/35536052/217408

我不得不修改管道位，使其与枚举​​正常工作
（见How没有一赠打字稿枚举条目的名称？）

I had to modify the pipe a bit to make it work properly with enums(see also How does one get the names of TypeScript enum entries?)

@Pipe({name: 'keys'})
export class KeysPipe implements PipeTransform {
  transform(value, args:string[]) : any {
    let keys = [];
    for (var enumMember in value) {
      var isValueProperty = parseInt(enumMember, 10) >= 0
      if (isValueProperty) {
        keys.push({key: enumMember, value: value[enumMember]});
        // Uncomment if you want log
        // console.log("enum member: ", value[enumMember]);
      }
    }
    return keys;
  }
}

@Component({ ...
  pipes: [KeysPipe],
  template: `
  <select>
     <option *ngFor="#item of countries | keys" [value]="item.key">{{item.value}}</option>
  </select>
`
})
class MyComponent {
  countries = CountryCodeEnum;
}

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