我想迭代一个TypeScript枚举对象,并获得每个枚举符号名称,例如: enum myEnum {entry1, entry2}
for (var entry in myEnum) {
// use entry's name here, e.g., "entry1"
}
我想迭代一个TypeScript枚举对象,并获得每个枚举符号名称,例如: enum myEnum {entry1, entry2}
for (var entry in myEnum) {
// use entry's name here, e.g., "entry1"
}
当前回答
我的Enum是这样的:
export enum UserSorting {
SortByFullName = "Sort by FullName",
SortByLastname = "Sort by Lastame",
SortByEmail = "Sort by Email",
SortByRoleName = "Sort by Role",
SortByCreatedAt = "Sort by Creation date",
SortByCreatedBy = "Sort by Author",
SortByUpdatedAt = "Sort by Edit date",
SortByUpdatedBy = "Sort by Editor",
}
这样做会返回undefined:
UserSorting[UserSorting.SortByUpdatedAt]
为了解决这个问题,我选择了另一种使用管道的方法:
import { Pipe, PipeTransform } from '@angular/core';
@Pipe({
name: 'enumKey'
})
export class EnumKeyPipe implements PipeTransform {
transform(value, args: string[] = null): any {
let enumValue = args[0];
var keys = Object.keys(value);
var values = Object.values(value);
for (var i = 0; i < keys.length; i++) {
if (values[i] == enumValue) {
return keys[i];
}
}
return null;
}
}
要使用它:
return this.enumKeyPipe.transform(UserSorting, [UserSorting.SortByUpdatedAt]);
其他回答
如果它是你的枚举,你定义如下所示,名称和值是相同的,它会直接给你条目的名称。
enum myEnum {
entry1="entry1",
entry2="entry2"
}
for (var entry in myEnum) {
// use entry's name here, e.g., "entry1"
}
如果你想在html中获取名字
对于这个枚举
enum CanadianProvinces {
AB,
BC,
MB,
NB,
NL,
NT,
NS,
NU,
ON,
PE,
QC,
SK,
YT
}
将组件中的变量赋值为
canadianProvinces = CanadianProvinces
然后,在你的html
{{canadianProvinces[0]}}
对我来说,一个更简单、实用和直接的方法来理解正在发生的事情,就是下面的列举:
enum colors { red, green, blue };
本质上将转换为:
var colors = { red: 0, green: 1, blue: 2,
[0]: "red", [1]: "green", [2]: "blue" }
正因为如此,以下情况将是正确的:
colors.red === 0
colors[colors.red] === "red"
colors["red"] === 0
这创建了一个简单的方法来获取枚举的名称,如下所示:
var color: colors = colors.red;
console.log("The color selected is " + colors[color]);
它还创建了一种将字符串转换为枚举值的好方法。
var colorName: string = "green";
var color: colors = colors.red;
if (colorName in colors) color = colors[colorName];
以上两种情况更为常见,因为通常您对特定值的名称和以通用方式序列化值更感兴趣。
我卑微的2美分基于阅读一个了不起的评论从github TS讨论
const EnvironmentVariants = ['development', 'production', 'test'] as const
type EPredefinedEnvironment = typeof EnvironmentVariants[number]
然后在编译时:
// TS2322: Type '"qaEnv"' is not assignable to type '"development" | "production" | "test"'.
const qaEnv: EPredefinedEnvironment = 'qa'
在运行时:
function isPredefinedEnvironemt(env: string) {
for (const predefined of EnvironmentVariants) {
if (predefined === env) {
return true
}
}
return false
}
assert(isPredefinedEnvironemet('test'), true)
assert(isPredefinedEnvironemet('qa'), false)
注意,for(const index in environmentvariables){…}将遍历"0","1","2"集合
这个解决方案也可以。
enum ScreenType {
Edit = 1,
New = 2,
View = 4
}
var type: ScreenType = ScreenType.Edit;
console.log(ScreenType[type]); //Edit