[英]What happened to the directives property in the Component decorator for Angular 2?
我正在使用Angular CLI v1.0.0-beta.19-3来构建/构建Angular 2网站。 我按照ng g component file-upload
生成我的组件。
我注意到生成的组件file-upload.component.ts
如下所示。
@Component({
selector: 'file-upload',
templateUrl: './file-upload.component.html',
styleUrls: ['./file-upload.component.css']
})
export class FileUploadComponent implements OnInit {
...
}
我需要在自己的组件中使用此组件ng2-file-upload 。 因此,我尝试在@Component
装饰器上添加directives
属性,但是,我在VS Code中遇到错误。
@Component({
selector: 'file-upload',
templateUrl: './file-upload.component.html',
styleUrls: ['./file-upload.component.css'],
directives: [ FILE_UPLOAD_DIRECTIVES ]
})
export class FileUploadComponent implements OnInit {
...
}
[ts] Argument of type '{ selector: string; templateUrl: string; styleUrls: string[]; directives: undefined[]; }' is not assignable to parameter of type 'Component'. Object literal may only specify known properties, and 'directives' does not exist in type 'Component'.
我的导入如下所示。
import { Component, OnInit, Input } from '@angular/core';
import { NgClass, NgStyle } from '@angular/common';
import { FileSelectDirective, FileDropDirective, FileUploadModule, FileUploader, FileUploaderOptions } from 'ng2-file-upload';
当我运行应用ng serve
,我在控制台中看到以下错误报告。
zone.js:388 Unhandled Promise rejection: Template parse errors: Can't bind to 'uploader' since it isn't a known property of 'div'. (" [ngClass]="{'nv-file-over': hasBaseDropZoneOver}" (fileOver)="fileOverBase($event)" [ERROR ->][uploader]="uploader" class="well my-drop-zone">
这是我在package.json
的依赖项。
{
"name": "app-www",
"version": "0.0.0",
"license": "MIT",
"angular-cli": {},
"scripts": {
"start": "ng serve",
"lint": "tslint \"src/**/*.ts\"",
"test": "ng test",
"pree2e": "webdriver-manager update",
"e2e": "protractor"
},
"private": true,
"dependencies": {
"@angular/common": "~2.1.1",
"@angular/compiler": "~2.1.1",
"@angular/core": "~2.1.1",
"@angular/forms": "~2.1.1",
"@angular/http": "~2.1.1",
"@angular/platform-browser": "~2.1.1",
"@angular/platform-browser-dynamic": "~2.1.1",
"@angular/router": "~3.1.1",
"angular2-cookie": "^1.2.5",
"bootstrap": "^3.3.7",
"core-js": "^2.4.1",
"jquery": "^3.1.1",
"lodash": "^4.16.6",
"ng2-bootstrap": "^1.1.16",
"ng2-file-upload": "^1.1.2",
"rxjs": "5.0.0-beta.12",
"ts-helpers": "^1.1.1",
"zone.js": "^0.6.25"
},
"devDependencies": {
"@types/jasmine": "^2.2.30",
"@types/lodash": "^4.14.38",
"@types/node": "^6.0.45",
"angular-cli": "1.0.0-beta.19-3",
"codelyzer": "1.0.0-beta.1",
"jasmine-core": "2.4.1",
"jasmine-spec-reporter": "2.5.0",
"karma": "1.2.0",
"karma-chrome-launcher": "^2.0.0",
"karma-cli": "^1.0.1",
"karma-jasmine": "^1.0.2",
"karma-remap-istanbul": "^0.2.1",
"protractor": "4.0.9",
"ts-node": "1.2.1",
"tslint": "3.13.0",
"typescript": "~2.0.3",
"webdriver-manager": "10.2.5"
}
}
医生说要使用此导入语句。
import { FILE_UPLOAD_DIRECTIVES } from 'ng2-file-upload';
但是在VS Code中,它表示以下内容。
[ts] Module '"/Users/jwayne/git/app-www/node_modules/ng2-file-upload/ng2-file-upload"' has no exported member 'FILE_UPLOAD_DIRECTIVES'.
更有趣的是,我创建了自己的登录组件,如下所示。
@Component({
selector: 'login-component',
templateUrl: './login.component.html',
styleUrls: ['./login.component.css']
})
export class LoginComponent implements OnInit {
...
}
为了在另一个组件中使用它,我什至不必再将其作为指令或类似的东西引用。 例如,我有一个使用此登录组件的默认组件。 HTML如下所示。
<login-component></login-component>
并且代码如下所示(请注意,组件装饰器没有指令属性)。
@Component({
selector: 'app-default',
templateUrl: './default.component.html',
styleUrls: ['./default.component.css']
})
export class DefaultComponent implements OnInit, OnDestroy {
...
}
尽管app.module.ts
文件现在已被修改。
import { LoginComponent } from './login/login.component';
import { DefaultComponent } from './default/default.component';
@NgModule({
declarations: [
AppComponent,
LoginComponent,
DefaultComponent
],
imports: [
BrowserModule,
FormsModule,
HttpModule,
RouterModule.forRoot([
{ path: 'default', component: DefaultComponent },
{ path: 'main', component: MainComponent, canActivate: [ UserAuthGuard ] },
{ path: '', redirectTo: '/default', pathMatch: 'full' },
{ path: '**', redirectTo: '/default' }
])
],
providers: [
UserAuthGuard
],
bootstrap: [AppComponent]
})
export class AppModule { }
因此,发生了很多事情,但是首先,组件装饰器的指令属性发生了什么?
解决此问题的关键是将指令导入app.module.ts
,然后使用@NgModule
进行声明。 这是app.module.ts
的片段。
import { FileSelectDirective, FileDropDirective} from 'ng2-file-upload';
import { AppComponent } from './app.component';
@NgModule({
declarations: [
AppComponent,
FileSelectDirective, FileDropDirective
],
imports: [
BrowserModule,
FormsModule,
HttpModule,
RouterModule.forRoot([
{ path: 'default', component: DefaultComponent },
{ path: 'main', component: MainComponent, canActivate: [ UserAuthGuard ] },
{ path: '', redirectTo: '/default', pathMatch: 'full' },
{ path: '**', redirectTo: '/default' }
])
],
providers: [ ... ],
bootstrap: [AppComponent]
})
export class AppModule { }
在我的组件中,我仍然必须导入指令。 这是另一个片段。
import { Component, OnInit, Input } from '@angular/core';
import { NgClass, NgStyle } from '@angular/common';
import {
FileSelectDirective,
FileDropDirective,
FileUploader,
FileUploaderOptions
} from 'ng2-file-upload';
import * as _ from 'lodash';
import { LoginService } from '../service/login.service';
@Component({
selector: 'file-upload',
templateUrl: './file-upload.component.html',
styleUrls: ['./file-upload.component.css']
})
export class FileUploadComponent implements OnInit {
//body omitted
}
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