自定义Angular 2指令不起作用

Question

错误
模板解析错误:
无法绑定到'time-delta',因为它不是'p'的已知属性.

文档中的解决方案
我必须将指令添加到声明数组中.我已经这样做了.

现在我的架构:我有三个模块:

• AppModule(root)
• TimeModule(以后应该是一个辅助模块,带有一些指令)
• AuthModule(登录,注册组件等)

AppModule:

@NgModule({
    imports: [
        TimeModule,
        BrowserModule,
        FormsModule,
        AuthModule,
        routing,
    ],
    declarations: [
        AppComponent
    ],
    providers: [
        appRoutingProviders
    ],
    bootstrap: [AppComponent]
})

AuthModule:

@NgModule({
    imports: [
        BrowserModule,
        FormsModule,
        authRouting
    ],
    declarations: [
        AuthComponent,
        LoginComponent,
        SignupComponent,
        LogoutComponent
    ],
    providers: [
        AuthGuard,
        AuthService
    ],
    bootstrap: [ LoginComponent ]
})

TimeModule:

@NgModule({
    declarations: [
        ReadableDatePipe,
        TimeDeltaDirective
    ]
})

现在我试图在LoginComponent的视图中使用我的TimeDeltaDirective.我已经尝试将指令添加到其他声明数组中,但这也不起作用.

我感谢任何支持!谢谢

TimeDeltaDirective:

import { Directive, ElementRef, Input, Renderer } from '@angular/core';

@Directive({ selector: '[time-delta]' })
export class TimeDeltaDirective {
    constructor(renderer: Renderer, el: ElementRef) {
        function getTimeDelta(date: Date) {
            var now = new Date();
            return (now.getTime() - date.getTime()) / 1000;
        }

        this.delta = getTimeDelta(new Date(this.date));
    }

    @Input('date') date: string;
    delta: number;
}

LoginComponent中的用法(示例):

@Component({
    selector: 'login',
    template: `
    <p date="2016-09-28 00:00:00" [time-delta]>{{delta}}</p>
  `
})

Answer 1

您需要TimeDeltaDirective从您的导出TimeModule然后导入TimeModule,AuthModule因为您LoginComponent已经在那里进行了decalred,这就是您要使用指令的地方.这样,TimeDeltaDirective将可以LoginComponent在其他声明的组件中使用AuthModule.所以,它应该是这样的:

AuthModule

@NgModule({
    imports: [
        BrowserModule,
        FormsModule,
        authRouting,
        TimeModule
    ],
    declarations: [
        AuthComponent,
        LoginComponent,
        SignupComponent,
        LogoutComponent
    ],
    providers: [
        AuthGuard,
        AuthService
    ],
    bootstrap: [ LoginComponent ]
})

TimeModule

@NgModule({
    declarations: [
        ReadableDatePipe,
        TimeDeltaDirective
    ],
    exports: [
        TimeDeltaDirective
    ]
})