Question

我正在尝试在let events = require('events'); var loader = new events.EventEmitter(); watchdog(cmddir, (dir) => { loader.emit("loadcommand", dir) loader.on('loadcommand', (file) => { require(file); });中进行表单绑定。以下是我的代码 app.component.ts

angular 4

app.module.ts

import { Component, Input, OnChanges, SimpleChange, OnInit } from '@angular/core';
import { FormGroup, FormControl } from '@angular/forms';


@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {

  form: FormGroup;
  ngOnInit() {
      this.form = new FormGroup({
        firstname: new FormControl('First Name'),
        lastname: new FormControl(''),
        languages: new FormControl('')
      });
    }

  onSubmit = function(user) {
    console.log(user);
  };
}

app.component.html

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { BrowserModule } from '@angular/platform-browser';
import { RouterModule } from '@angular/router';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
import { ProductComponent } from './product/product.component';
import { MemberComponent } from './member/member.component';
import { ItemListComponent } from './item-list/item-list.component';
import { SortPipe } from './app.sort';

@NgModule({
  declarations: [
    SortPipe,
    AppComponent,
    ProductComponent,
    MemberComponent,
    ItemListComponent
  ],
  imports: [
    CommonModule,
    FormsModule,
    ReactiveFormsModule,
  ],
  providers: [],
  exports: [
    CommonModule,
    FormsModule,
    ReactiveFormsModule
  ],
  bootstrap: [AppComponent],
})
export class AppModule { }

但是我收到以下错误

未捕获错误：模板解析错误：无法绑定到＆＃39; FormGroup＆＃39;因为它不是“形式”的已知属性。（＆＃34; - ＆GT; ] [FormGroup] =＆＃34;形式＆＃34; （ngSubmit）=＆＃34;的onSubmit（form.value）＆＃34;＆GT; ）在JitCompiler.webpackJsonp ... / .. / ../ compiler /@angular/compiler.es5.js.JitCompiler._compileComponents（compiler.es5.js：26882）在compiler.es5.js：26769 at Object.then（compiler.es5.js：1679）在JitCompiler.webpackJsonp ... / .. / ../ compiler /@angular/compiler.es5.js.JitCompiler._compileModuleAndComponents（compiler.es5.js：26768） at JitCompiler.webpackJsonp ... / .. / .. / compiler/@angular/compiler.es5.js.JitCompiler.compileModuleAsync（compiler.es5.js：26697）

Answer 1

好像你输错了。

应该是 f ormGroup而不是 F ormGroup：

<form [formGroup]="form"

因为FormGroupDirective看起来像：

@Directive({
  selector: '[formGroup]', 
  ...
})
export class FormGroupDirective extends ControlContainer implements Form,

未捕获错误：模板解析错误：无法绑定到＆＃39; FormGroup＆＃39;因为它不是“形式”的已知属性。

1 个答案: