这种情况
我试图在我的Angular应用程序中创建一个非常简单的表单，但无论如何，它都无法工作。
Angular版本
Angular 2.0.0 RC5
这个错误
不能绑定到'formGroup'因为它不是'form'的已知属性
的代码
视图
<form [formGroup]="newTaskForm" (submit)="createNewTask()">
<div class="form-group">
<label for="name">Name</label>
<input type="text" name="name" required>
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
控制器
import { Component } from '@angular/core';
import { FormGroup, FormControl, Validators, FormBuilder } from '@angular/forms';
import {FormsModule,ReactiveFormsModule} from '@angular/forms';
import { Task } from './task';
@Component({
selector: 'task-add',
templateUrl: 'app/task-add.component.html'
})
export class TaskAddComponent {
newTaskForm: FormGroup;
constructor(fb: FormBuilder)
{
this.newTaskForm = fb.group({
name: ["", Validators.required]
});
}
createNewTask()
{
console.log(this.newTaskForm.value)
}
}
《ngModule
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { routing } from './app.routing';
import { AppComponent } from './app.component';
import { TaskService } from './task.service'
@NgModule({
imports: [
BrowserModule,
routing,
FormsModule
],
declarations: [ AppComponent ],
providers: [
TaskService
],
bootstrap: [ AppComponent ]
})
export class AppModule { }
这个问题
为什么会出现这个错误?我遗漏了什么吗?
如果你必须导入两个模块，然后像下面这样添加
import {ReactiveFormsModule,FormsModule} from '@angular/forms';
@NgModule({
declarations: [
AppComponent,
HomeComponentComponent,
BlogComponentComponent,
ContactComponentComponent,
HeaderComponentComponent,
FooterComponentComponent,
RegisterComponent,
LoginComponent
],
imports: [
BrowserModule,
FormsModule,
HttpModule,
routes,
ReactiveFormsModule
],
providers: [],
bootstrap: [AppComponent]
})
你的Angular版本是11+，你使用的是VisualStudioCode?
你已经导入了FormsModule, ReactiveFormsModule，并将其添加到app.module.ts的import -section中(相关模块可能不同，请选择正确的模块):
// app.module.ts (excerpt)
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
imports: [
...
FormsModule,
ReactiveFormsModule,
...
],
您有正确的导入(有时还有其他具有类似名称的库);您已经在组件中定义并初始化了表单吗?
// MyWonderfulComponent (excerpt)
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
export class MyWonderfulComponent implements OnInit {
form: FormGroup;
...
constructor (private fb: FormBuilder) {
this.form = this.fb.group({
// DON'T FORGET THE FORM INITIALISATION
});
}
你的组件模板有你的表单:
<form [formGroup]="form" (ngSubmit)="submit()">
<!-- MY FORM CONTROLS ARE ALREADY HERE -->
</form>
您仍然会收到错误消息“…因为它不是已知的……”?
然后只需简单地重新启动VisualStudioCode:)
简单的解决方案:
步骤1:导入ReactiveFormModule
import {ReactiveFormsModule} from '@angular/forms';
步骤2:将“ReactiveFormsModule”添加到导入部分
imports: [
ReactiveFormsModule
]
步骤3:重新启动应用程序并完成
例子:
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import {ReactiveFormsModule} from '@angular/forms';
import { EscalationManagementRoutingModule } from './escalation-management-routing.module';
import { EscalationManagementRouteWrapperComponent } from './escalation-management-route-wrapper.component';
@NgModule({
declarations: [EscalationManagementRouteWrapperComponent],
imports: [
CommonModule,
EscalationManagementRoutingModule,
ReactiveFormsModule
]
})
export class EscalationManagementModule { }
