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[英]Template parse errors: Can't bind to 'formGroup' since it isn't a known property of 'form'
[英]Uncaught Error: Template parse errors: Can't bind to 'FormGroup' since it isn't a known property of 'form'
我正在嘗試在angular 4
進行表單綁定。 下面是我的代碼。
app.component.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.module.ts
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 { }
app.component.html
<form [FormGroup]="form" (ngSubmit)="onSubmit(form.value)">
<input type="text" placeholder="firstname" name="firstname" formControlName="firstname" />
<br>
<input type="text" placeholder="lastname" name="lastname" formControlName="lastname" />
<br>
<select name="languages" formControlName="languages">
<option value="C++">C++</option>
<option value="Java">Java</option>
<option value="Angular">Angular</option>
</select>
<br><br>
<input type="submit" value="submit" />
</form>
但是我收到以下錯誤
未捕獲的錯誤:模板解析錯誤:無法綁定到“ FormGroup”,因為它不是“ form”的已知屬性。 (“->] [FormGroup] =” form“(ngSubmit)=” onSubmit(form.value)“>),位於JitCompiler.webpackJsonp ... / .. / .. / compiler/@angular/compiler.es5。 js.JitCompiler._compileComponents(compiler.es5.js:26882)(編譯器.es5.js:26769)Object.then(compiler.es5.js:1679)在JitCompiler.webpackJsonp ... / .. / .. /@angular/compiler.es5.js.JitCompiler._compileModuleAndComponents(compiler.es5.js:26768)位於JitCompiler.webpackJsonp ... / .. / .. / compiler/@angular/compiler.es5.js.JitCompiler.compileModuleAsync (compiler.es5.js:26697)
您輸入的內容似乎錯誤。
它應該是f ormGroup而不是F ormGroup:
<form [formGroup]="form"
因為FormGroupDirective
看起來像:
@Directive({
selector: '[formGroup]',
...
})
export class FormGroupDirective extends ControlContainer implements Form,
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