46

I'm developing a Github repo which follows the offical tutorial of Angular (Tour of Heroes). You can see all the code here.

My problem, is that I have a directive declared in the main module of the app (app.module) and, if I use it inside the AppComponent, it works good (the directive only highlight a text inside a DOM element).

But I have another module called HeroesModule within AppModule, and inside a component of this module, this directive doesn't work.

The main code, here:

app/app.module.ts

...

import { HighlightDirective } from "./shared/highlight.directive";

@NgModule({
    imports: [
        BrowserModule,
        FormsModule,
        HttpModule,
        InMemoryWebApiModule.forRoot(InMemoryDataService),
        AppRoutingModule,
        CoreModule,
        HeroesModule
    ],
    declarations: [
        AppComponent,
        HeroTopComponent,
        HighlightDirective <-------
    ],
    providers: [
        { provide: APP_CONFIG, useValue: AppConfig }
    ],
    bootstrap: [ AppComponent ]
})

...

app/heroes/heroes.module.ts

@NgModule({
    imports: [
        CommonModule,
        FormsModule,
        HeroRoutingModule
    ],
    declarations: [
        HeroListComponent,
        HeroSearchComponent,
        HeroDetailComponent,
        HeroFormComponent
    ],
    providers: [
        HeroService
    ],
    exports: [
        HeroSearchComponent
    ]
})

app/shared/highlight.directive.ts

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

@Directive({ selector: '[tohHighlight]' })

export class HighlightDirective {
    constructor(el: ElementRef) {
        el.nativeElement.style.backgroundColor = 'yellow';
    }
}

app/app.component.ts

<h1 tohHighlight>{{title}}</h1> <----- HERE WORKS
<toh-nav></toh-nav>
<router-outlet></router-outlet>

app/heroes/hero-list/hero-list.component.ts

<div *ngIf="selectedHero">
    <h2>
        {{selectedHero.name | uppercase}} is my hero
    </h2>
    <p tohHighlight>Test</p> <----- HERE IT DOESN'T
    <button (click)="gotoDetail()">View Details</button>
</div>

You can see, install it and test it by yourself in the Github repo, if you need it.

4

2 回答 2

63

根据@CrazyMac 的评论，一个好方法是创建一个DirectivesModule. 在此模块中，您可以声明并导入所有指令，然后您可以在任何您想要的地方导入此模块。

应用程序/模块/指令/directives.module.ts

import { NgModule } from '@angular/core';
import { HighlightDirective } from './highlight.directive';

@NgModule({
  imports: [],
  declarations: [HighlightDirective],
  exports: [HighlightDirective]
})
export class DirectivesModule { }

应用程序/模块/指令/highLight.directive.ts

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

@Directive({ selector: '[myHighlight]' })
export class HighlightDirective {
  constructor(el: ElementRef) {
    el.nativeElement.style.backgroundColor = 'yellow';
  }
}

应用程序/模块/otherModule/other-module.module.ts

import { DirectivesModule } from '../directives/directives.module';

@NgModule({
  imports: [
    DirectivesModule
  ],
  declarations: []
})
export class OtherModule { }
于 2017-09-27T20:58:04.127 回答
52

如果您需要使用指令

@Directive({
  selector: '[appMyCommon]'
})
export class MyCommonDirective{}

您应该在任何地方创建一个新模块。

如果您使用 Angular CLI，您可以生成：

ng g module my-common

模块：

@NgModule({
 declarations: [MyCommonDirective],
 exports:[MyCommonDirective]
})
export class MyCommonModule{}

重要的！导出允许您在模块之外使用指令。

最后，在需要使用指令的每个模块中导入该模块。

例如：

@NgModule({
  imports: [MyCommonModule]
})
export class AppModule{}

示例：Plunker

于 2017-01-06T12:20:56.020 回答