在 angular2 视图模板中传递枚举

问题描述

我们可以在 angular2 视图模板中使用枚举吗?

</div>

将字符串作为输入传递:

enum DropdownType {仪器，帐户，货币}@成分({选择器: '[.Dropdown]',})导出类下拉{@Input() public set dropdownType(value: any) {控制台日志(值)；};}

但是如何传递一个枚举配置呢?我想在模板中这样的东西:

</div>

最佳做法是什么?

创建了一个示例:

import {bootstrap} from 'angular2/platform/browser';从'angular2/core'导入{组件、视图、输入}；导出枚举 DropdownType {仪器 = 0,帐户 = 1,货币 = 2}@Component({选择器: '[.Dropdown]',})@View({模板:''})导出类下拉{公共 dropdownTypes = DropdownType;@Input() public set dropdownType(value: any) {console.log(`-- dropdownType: ${value}`);};构造函数(){console.log('--下拉准备好--')；}}@Component({ 选择器: 'header' })@View({ 模板:'<div class="Dropdown" dropdownType="dropdownTypes.instrument"> </div>', 指令:[Dropdown] })类标题{}@Component({ 选择器: 'my-app' })@View({ 模板: '</header>', 指令: [Header] })类测试员{}引导程序(测试员)；

解决方案

为组件类的父组件上的枚举创建一个属性并将枚举分配给它，然后在模板中引用该属性.

export class Parent {public dropdownTypes = DropdownType;}导出类下拉{@Input() public set dropdownType(value: any) {控制台日志(值)；};}

这允许您在模板中按预期枚举枚举.

<div class="Dropdown" [dropdownType]="dropdownTypes.instrument"></div>

Can we use enums in an angular2 view template?

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

passes the string as input:

enum DropdownType {
    instrument,
    account,
    currency
}

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

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

        console.log(value);
    };
}

But how to pass an enum configuration? I want something like this in the template:

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

What would be the best practice?

Edited:Created an example:

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);

解决方案

Create a property for your enum on the parent component to your component class and assign the enum to it, then reference that property in your template.

export class Parent {
    public dropdownTypes = DropdownType;
}

export class Dropdown {
    @Input() public set dropdownType(value: any) {
        console.log(value);
    };
}

This allows you to enumerate the enum as expected in your template.

<div class="Dropdown" [dropdownType]="dropdownTypes.instrument"></div>

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