我正在編寫一個指令,它依賴於TemplateRef<any>
和ViewContainerRef
。但我的指令不能讓這些依賴關係注入下面是我的代碼:Angular2:無法解析我的指令的所有參數
main.ts
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';
platformBrowserDynamic().bootstrapModule(AppModule);
app.module.ts
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { HelloWorld } from './HelloWorld.directive';
@NgModule({
imports: [BrowserModule],
declarations: [AppComponent, HelloWorld],
bootstrap: [AppComponent]
})
export class AppModule { }
app.component.ts
import { Component } from '@angular/core';
@Component({
selector: 'my-app',
template: `
Hello world!
<template [lcngHw]="true"><div></div></template>
`
})
export class AppComponent {
}
HelloWorld.directive.ts
import { Directive } from '@angular/core';
import { Input } from '@angular/core';
import { TemplateRef, ViewContainerRef } from '@angular/core';
@Directive({
selector: '[lcngHw]'
})
export class HelloWorld{
constructor(private tf: TemplateRef<any>, private vc: ViewContainerRef){
}
@Input()
set lcngHw(value: boolean) {
if (value) {
this.vc.createEmbeddedView(this.tf);
}
else {
this.vc.clear();
}
}
}
這裏是我的transpiled HelloWorld.directive.js:
"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var core_1 = require('@angular/core');
var core_2 = require('@angular/core');
var HelloWorld = (function() {
function HelloWorld(tf, vc) {
this.tf = tf;
this.vc = vc;
}
Object.defineProperty(HelloWorld.prototype, "lcngHw", {
set: function (value) {
if (value) {
this.vc.createEmbeddedView(this.tf);
}
else {
this.vc.clear();
}
},
enumerable: true,
configurable: true
});
__decorate([
core_2.Input()
], HelloWorld.prototype, "lcngHw", null);
HelloWorld = __decorate([
core_1.Directive({
selector: '[lcngHw]'
})
], HelloWorld);
return HelloWorld;
}());
exports.HelloWorld = HelloWorld;
然後我跑我的應用程序,我得到以下錯誤:
錯誤:(SystemJS)無法解析HelloWorld的所有參數:(?,?)。
Error: Can't resolve all parameters for HelloWorld: (?, ?). at CompileMetadataResolver.getDependenciesMetadata (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:14268:21) at CompileMetadataResolver.getTypeMetadata (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:14169:28) at CompileMetadataResolver.getDirectiveMetadata (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:13944:30) at eval (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:14037:51) at Array.forEach (native) at CompileMetadataResolver.getNgModuleMetadata (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:14031:51) at RuntimeCompiler._compileComponents (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:16721:49) at RuntimeCompiler._compileModuleAndComponents (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:16659:39) at RuntimeCompiler.compileModuleAsync (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:16650:23) at PlatformRef_._bootstrapModuleWithZone (http://localhost:5000/node_modules/@angular/core/bundles/core.umd.js:6707:29) Evaluating http://localhost:5000/ViewContainerRefApp/main.js Error loading http://localhost:5000/ViewContainerRefApp/main.js at CompileMetadataResolver.getDependenciesMetadata (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:14268:21) at CompileMetadataResolver.getTypeMetadata (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:14169:28) at CompileMetadataResolver.getDirectiveMetadata (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:13944:30) at eval (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:14037:51) at Array.forEach (native) at CompileMetadataResolver.getNgModuleMetadata (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:14031:51) at RuntimeCompiler._compileComponents (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:16721:49) at RuntimeCompiler._compileModuleAndComponents (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:16659:39) at RuntimeCompiler.compileModuleAsync (http://localhost:5000/node_modules/@angular/compiler/bundles/compiler.umd.js:16650:23) at PlatformRef_._bootstrapModuleWithZone (http://localhost:5000/node_modules/@angular/core/bundles/core.umd.js:6707:29) Evaluating http://localhost:5000/ViewContainerRefApp/main.js Error loading http://localhost:5000/ViewContainerRefApp/main.js
我也是從這個live sample複製的代碼,我得到了同樣的錯誤。
看來TemplateRef<any>
和ViewContainerRef
的metadata
沒有註冊。但我找不到原因。任何人都可以幫助我?謝謝。
你如何使用它? http://plnkr.co/edit/mNS3JuKcLciXcgR0WQQj?p=preview – yurzui
你需要提供更多的代碼,特別是你的'app.module.ts' – cvsguimaraes
在這裏你可以看到一切工作http://plnkr.co/edit/ Indo8JByU7Cpdqb0iOO0?p = info另外,嘗試將所有從'@ angular/core'的導入放在一個語句中,如果您恰好在使用它,可能是webpack配置有問題。 – cvsguimaraes